feat(core): simplify truncation logic to only keep the newest message#18906

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nicohrubec merged 10 commits into from
Jan 21, 2026
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feat(core): simplify truncation logic to only keep the newest message #18906

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feat(core): simplify truncation logic to only keep the newest message
nicohrubec Jan 20, 2026
620d956
more tests
nicohrubec Jan 20, 2026
aaca8da
update test expectations
nicohrubec Jan 20, 2026
4ced95e
yarn fix
nicohrubec Jan 20, 2026
1c45147
revert changes
nicohrubec Jan 20, 2026
30ef964
.
nicohrubec Jan 20, 2026
e5d809d
clean up comments
nicohrubec Jan 21, 2026
52b0e2e
fix embeddings truncation
nicohrubec Jan 21, 2026
e36f8d3
set embeddings as separate attribute and do not truncate
nicohrubec Jan 21, 2026
15215d4
early returns to make it a bit easier to understand
nicohrubec Jan 21, 2026
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9 changes: 5 additions & 4 deletions dev-packages/node-integration-tests/suites/tracing/anthropic/scenario-media-truncation.mjs
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Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -49,10 +49,15 @@ async function run() {
const client = instrumentAnthropicAiClient(mockClient);

// Send the image showing the number 3
// Put the image in the last message so it doesn't get dropped
await client.messages.create({
model: 'claude-3-haiku-20240307',
max_tokens: 1024,
messages: [
{
role: 'user',
content: 'what number is this?',
},
{
role: 'user',
content: [
Expand All@@ -66,10 +71,6 @@ async function run() {
},
],
},
{
role: 'user',
content: 'what number is this?',
},
],
temperature: 0.7,
});
Expand Down
21 changes: 17 additions & 4 deletions dev-packages/node-integration-tests/suites/tracing/anthropic/scenario-message-truncation.mjs
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Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -48,12 +48,11 @@ async function run() {

const client = instrumentAnthropicAiClient(mockClient);

// Create 3 large messages where:
// - First 2 messages are very large (will be dropped)
// - Last message is large but will be truncated to fit within the 20KB limit
// Test 1: Given an array of messages only the last message should be kept
// The last message should be truncated to fit within the 20KB limit
const largeContent1 = 'A'.repeat(15000); // ~15KB
const largeContent2 = 'B'.repeat(15000); // ~15KB
const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

await client.messages.create({
model: 'claude-3-haiku-20240307',
Expand All@@ -65,6 +64,20 @@ async function run() {
],
temperature: 0.7,
});

// Test 2: Given an array of messages only the last message should be kept
// The last message is small, so it should be kept intact
const smallContent = 'This is a small message that fits within the limit';
await client.messages.create({
model: 'claude-3-haiku-20240307',
max_tokens: 100,
messages: [
{ role: 'user', content: largeContent1 },
{ role: 'assistant', content: largeContent2 },
{ role: 'user', content: smallContent },
],
temperature: 0.7,
});
});
}

Expand Down
27 changes: 21 additions & 6 deletions dev-packages/node-integration-tests/suites/tracing/anthropic/test.ts
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Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -86,8 +86,7 @@ describe('Anthropic integration', () => {
data: expect.objectContaining({
'gen_ai.operation.name': 'messages',
'gen_ai.request.max_tokens': 100,
'gen_ai.request.messages':
'[{"role":"system","content":"You are a helpful assistant."},{"role":"user","content":"What is the capital of France?"}]',
'gen_ai.request.messages': '[{"role":"user","content":"What is the capital of France?"}]',
'gen_ai.request.model': 'claude-3-haiku-20240307',
'gen_ai.request.temperature': 0.7,
'gen_ai.response.id': 'msg_mock123',
Expand DownExpand Up@@ -638,6 +637,7 @@ describe('Anthropic integration', () => {
transaction: {
transaction: 'main',
spans: expect.arrayContaining([
// First call: Last message is large and gets truncated (only C's remain, D's are cropped)
expect.objectContaining({
data: expect.objectContaining({
'gen_ai.operation.name': 'messages',
Expand All@@ -653,6 +653,24 @@ describe('Anthropic integration', () => {
origin: 'auto.ai.anthropic',
status: 'ok',
}),
// Second call: Last message is small and kept without truncation
expect.objectContaining({
data: expect.objectContaining({
'gen_ai.operation.name': 'messages',
'sentry.op': 'gen_ai.messages',
'sentry.origin': 'auto.ai.anthropic',
'gen_ai.system': 'anthropic',
'gen_ai.request.model': 'claude-3-haiku-20240307',
// Small message should be kept intact
'gen_ai.request.messages': JSON.stringify([
{ role: 'user', content: 'This is a small message that fits within the limit' },
]),
}),
description: 'messages claude-3-haiku-20240307',
op: 'gen_ai.messages',
origin: 'auto.ai.anthropic',
status: 'ok',
}),
]),
},
})
Expand All@@ -677,6 +695,7 @@ describe('Anthropic integration', () => {
'sentry.origin': 'auto.ai.anthropic',
'gen_ai.system': 'anthropic',
'gen_ai.request.model': 'claude-3-haiku-20240307',
// Only the last message (with filtered media) should be kept
'gen_ai.request.messages': JSON.stringify([
{
role: 'user',
Expand All@@ -691,10 +710,6 @@ describe('Anthropic integration', () => {
},
],
},
{
role: 'user',
content: 'what number is this?',
},
]),
}),
description: 'messages claude-3-haiku-20240307',
Expand Down
24 changes: 20 additions & 4 deletions ...ckages/node-integration-tests/suites/tracing/google-genai/scenario-message-truncation.mjs
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -43,12 +43,11 @@ async function run() {

const client = instrumentGoogleGenAIClient(mockClient);

// Create 3 large messages where:
// - First 2 messages are very large (will be dropped)
// - Last message is large but will be truncated to fit within the 20KB limit
// Test 1: Given an array of messages only the last message should be kept
// The last message should be truncated to fit within the 20KB limit
const largeContent1 = 'A'.repeat(15000); // ~15KB
const largeContent2 = 'B'.repeat(15000); // ~15KB
const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

await client.models.generateContent({
model: 'gemini-1.5-flash',
Expand All@@ -63,6 +62,23 @@ async function run() {
{ role: 'user', parts: [{ text: largeContent3 }] },
],
});

// Test 2: Given an array of messages only the last message should be kept
// The last message is small, so it should be kept intact
const smallContent = 'This is a small message that fits within the limit';
await client.models.generateContent({
model: 'gemini-1.5-flash',
config: {
temperature: 0.7,
topP: 0.9,
maxOutputTokens: 100,
},
contents: [
{ role: 'user', parts: [{ text: largeContent1 }] },
{ role: 'model', parts: [{ text: largeContent2 }] },
{ role: 'user', parts: [{ text: smallContent }] },
],
});
});
}

Expand Down
26 changes: 23 additions & 3 deletions dev-packages/node-integration-tests/suites/tracing/google-genai/test.ts
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -94,9 +94,7 @@ describe('Google GenAI integration', () => {
'gen_ai.request.temperature': 0.8,
'gen_ai.request.top_p': 0.9,
'gen_ai.request.max_tokens': 150,
'gen_ai.request.messages': expect.stringMatching(
/\[\{"role":"system","content":"You are a friendly robot who likes to be funny."\},/,
), // Should include history when recordInputs: true
'gen_ai.request.messages': '[{"role":"user","parts":[{"text":"Hello, how are you?"}]}]',
}),
description: 'chat gemini-1.5-pro create',
op: 'gen_ai.chat',
Expand DownExpand Up@@ -504,6 +502,7 @@ describe('Google GenAI integration', () => {
transaction: {
transaction: 'main',
spans: expect.arrayContaining([
// First call: Last message is large and gets truncated (only C's remain, D's are cropped)
expect.objectContaining({
data: expect.objectContaining({
'gen_ai.operation.name': 'models',
Expand All@@ -521,6 +520,27 @@ describe('Google GenAI integration', () => {
origin: 'auto.ai.google_genai',
status: 'ok',
}),
// Second call: Last message is small and kept without truncation
expect.objectContaining({
data: expect.objectContaining({
'gen_ai.operation.name': 'models',
'sentry.op': 'gen_ai.models',
'sentry.origin': 'auto.ai.google_genai',
'gen_ai.system': 'google_genai',
'gen_ai.request.model': 'gemini-1.5-flash',
// Small message should be kept intact
'gen_ai.request.messages': JSON.stringify([
{
role: 'user',
parts: [{ text: 'This is a small message that fits within the limit' }],
},
]),
}),
description: 'models gemini-1.5-flash',
op: 'gen_ai.models',
origin: 'auto.ai.google_genai',
status: 'ok',
}),
]),
},
})
Expand Down
18 changes: 14 additions & 4 deletions dev-packages/node-integration-tests/suites/tracing/langchain/scenario-message-truncation.mjs
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -51,17 +51,27 @@ async function run() {

const largeContent1 = 'A'.repeat(15000); // ~15KB
const largeContent2 = 'B'.repeat(15000); // ~15KB
const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

// Create one very large string that gets truncated to only include Cs
await model.invoke(largeContent3 + largeContent2);
// Test 1: Create one very large string that gets truncated to only include Cs
await model.invoke(largeContent3);

// Create an array of messages that gets truncated to only include the last message (result should again contain only Cs)
// Test 2: Create an array of messages that gets truncated to only include the last message
// The last message should be truncated to fit within the 20KB limit (result should again contain only Cs)
await model.invoke([
{ role: 'system', content: largeContent1 },
{ role: 'user', content: largeContent2 },
{ role: 'user', content: largeContent3 },
]);

// Test 3: Given an array of messages only the last message should be kept
// The last message is small, so it should be kept intact
const smallContent = 'This is a small message that fits within the limit';
await model.invoke([
{ role: 'system', content: largeContent1 },
{ role: 'user', content: largeContent2 },
{ role: 'user', content: smallContent },
]);
});

await Sentry.flush(2000);
Expand Down
20 changes: 20 additions & 0 deletions dev-packages/node-integration-tests/suites/tracing/langchain/test.ts
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -198,6 +198,7 @@ describe('LangChain integration', () => {
const EXPECTED_TRANSACTION_MESSAGE_TRUNCATION = {
transaction: 'main',
spans: expect.arrayContaining([
// First call: String input truncated (only C's remain, D's are cropped)
expect.objectContaining({
data: expect.objectContaining({
'gen_ai.operation.name': 'chat',
Expand All@@ -213,6 +214,7 @@ describe('LangChain integration', () => {
origin: 'auto.ai.langchain',
status: 'ok',
}),
// Second call: Array input, last message truncated (only C's remain, D's are cropped)
expect.objectContaining({
data: expect.objectContaining({
'gen_ai.operation.name': 'chat',
Expand All@@ -228,6 +230,24 @@ describe('LangChain integration', () => {
origin: 'auto.ai.langchain',
status: 'ok',
}),
// Third call: Last message is small and kept without truncation
expect.objectContaining({
data: expect.objectContaining({
'gen_ai.operation.name': 'chat',
'sentry.op': 'gen_ai.chat',
'sentry.origin': 'auto.ai.langchain',
'gen_ai.system': 'anthropic',
'gen_ai.request.model': 'claude-3-5-sonnet-20241022',
// Small message should be kept intact
'gen_ai.request.messages': JSON.stringify([
{ role: 'user', content: 'This is a small message that fits within the limit' },
]),
}),
description: 'chat claude-3-5-sonnet-20241022',
op: 'gen_ai.chat',
origin: 'auto.ai.langchain',
status: 'ok',
}),
]),
};

Expand Down
18 changes: 14 additions & 4 deletions ...ckages/node-integration-tests/suites/tracing/langchain/v1/scenario-message-truncation.mjs
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -51,17 +51,27 @@ async function run() {

const largeContent1 = 'A'.repeat(15000); // ~15KB
const largeContent2 = 'B'.repeat(15000); // ~15KB
const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

// Create one very large string that gets truncated to only include Cs
await model.invoke(largeContent3 + largeContent2);
// Test 1: Create one very large string that gets truncated to only include Cs
await model.invoke(largeContent3);

// Create an array of messages that gets truncated to only include the last message (result should again contain only Cs)
// Test 2: Create an array of messages that gets truncated to only include the last message
// The last message should be truncated to fit within the 20KB limit (result should again contain only Cs)
await model.invoke([
{ role: 'system', content: largeContent1 },
{ role: 'user', content: largeContent2 },
{ role: 'user', content: largeContent3 },
]);

// Test 3: Given an array of messages only the last message should be kept
// The last message is small, so it should be kept intact
const smallContent = 'This is a small message that fits within the limit';
await model.invoke([
{ role: 'system', content: largeContent1 },
{ role: 'user', content: largeContent2 },
{ role: 'user', content: smallContent },
]);
});

await Sentry.flush(2000);
Expand Down
20 changes: 20 additions & 0 deletions dev-packages/node-integration-tests/suites/tracing/langchain/v1/test.ts
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -241,6 +241,7 @@ conditionalTest({ min: 20 })('LangChain integration (v1)', () => {
const EXPECTED_TRANSACTION_MESSAGE_TRUNCATION = {
transaction: 'main',
spans: expect.arrayContaining([
// First call: String input truncated (only C's remain, D's are cropped)
expect.objectContaining({
data: expect.objectContaining({
'gen_ai.operation.name': 'chat',
Expand All@@ -256,6 +257,7 @@ conditionalTest({ min: 20 })('LangChain integration (v1)', () => {
origin: 'auto.ai.langchain',
status: 'ok',
}),
// Second call: Array input, last message truncated (only C's remain, D's are cropped)
expect.objectContaining({
data: expect.objectContaining({
'gen_ai.operation.name': 'chat',
Expand All@@ -271,6 +273,24 @@ conditionalTest({ min: 20 })('LangChain integration (v1)', () => {
origin: 'auto.ai.langchain',
status: 'ok',
}),
// Third call: Last message is small and kept without truncation
expect.objectContaining({
data: expect.objectContaining({
'gen_ai.operation.name': 'chat',
'sentry.op': 'gen_ai.chat',
'sentry.origin': 'auto.ai.langchain',
'gen_ai.system': 'anthropic',
'gen_ai.request.model': 'claude-3-5-sonnet-20241022',
// Small message should be kept intact
'gen_ai.request.messages': JSON.stringify([
{ role: 'user', content: 'This is a small message that fits within the limit' },
]),
}),
description: 'chat claude-3-5-sonnet-20241022',
op: 'gen_ai.chat',
origin: 'auto.ai.langchain',
status: 'ok',
}),
]),
};

Expand Down
6 changes: 6 additions & 0 deletions dev-packages/node-integration-tests/suites/tracing/openai/scenario-embeddings.mjs
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -67,6 +67,12 @@ async function run() {
} catch {
// Error is expected and handled
}

// Third test: embeddings API with multiple inputs
await client.embeddings.create({
input: ['First input text', 'Second input text', 'Third input text'],
model: 'text-embedding-3-small',
});
});

server.close();
Expand Down
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feat(core): simplify truncation logic to only keep the newest message#18906

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 Merged

nicohrubec
merged 10 commits into

from

Jan 21, 2026
 Merged


feat(core): simplify truncation logic to only keep the newest message
#18906
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ff334af

feat(core): simplify truncation logic to only keep the newest message


nicohrubec Jan 20, 2026
620d956

more tests


nicohrubec Jan 20, 2026
aaca8da

update test expectations


nicohrubec Jan 20, 2026
4ced95e

yarn fix


nicohrubec Jan 20, 2026
1c45147

revert changes


nicohrubec Jan 20, 2026
30ef964

.


nicohrubec Jan 20, 2026
e5d809d

clean up comments


nicohrubec Jan 21, 2026
52b0e2e

fix embeddings truncation


nicohrubec Jan 21, 2026
e36f8d3

set embeddings as separate attribute and do not truncate


nicohrubec Jan 21, 2026
15215d4

early returns to make it a bit easier to understand


nicohrubec Jan 21, 2026

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9 changes: 5 additions & 4 deletions
dev-packages/node-integration-tests/suites/tracing/anthropic/scenario-media-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -49,10 +49,15 @@ async function run() {
 const client = instrumentAnthropicAiClient(mockClient);

 // Send the image showing the number 3
 // Put the image in the last message so it doesn't get dropped
 await client.messages.create({
 model: 'claude-3-haiku-20240307',
 max_tokens: 1024,
 messages: [
 {
 role: 'user',
 content: 'what number is this?',
 },
 {
 role: 'user',
 content: [
Expand All@@ -66,10 +71,6 @@ async function run() {
 },
 ],
 },
 {
 role: 'user',
 content: 'what number is this?',
 },
 ],
 temperature: 0.7,
 });
Expand Down

21 changes: 17 additions & 4 deletions
dev-packages/node-integration-tests/suites/tracing/anthropic/scenario-message-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -48,12 +48,11 @@ async function run() {

 const client = instrumentAnthropicAiClient(mockClient);

 // Create 3 large messages where:
 // - First 2 messages are very large (will be dropped)
 // - Last message is large but will be truncated to fit within the 20KB limit
 // Test 1: Given an array of messages only the last message should be kept
 // The last message should be truncated to fit within the 20KB limit
 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 await client.messages.create({
 model: 'claude-3-haiku-20240307',
Expand All@@ -65,6 +64,20 @@ async function run() {
 ],
 temperature: 0.7,
 });

 // Test 2: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await client.messages.create({
 model: 'claude-3-haiku-20240307',
 max_tokens: 100,
 messages: [
 { role: 'user', content: largeContent1 },
 { role: 'assistant', content: largeContent2 },
 { role: 'user', content: smallContent },
 ],
 temperature: 0.7,
 });
 });
}

Expand Down

27 changes: 21 additions & 6 deletions
dev-packages/node-integration-tests/suites/tracing/anthropic/test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -86,8 +86,7 @@ describe('Anthropic integration', () => {
 data: expect.objectContaining({
 'gen_ai.operation.name': 'messages',
 'gen_ai.request.max_tokens': 100,
 'gen_ai.request.messages':
 '[{"role":"system","content":"You are a helpful assistant."},{"role":"user","content":"What is the capital of France?"}]',
 'gen_ai.request.messages': '[{"role":"user","content":"What is the capital of France?"}]',
 'gen_ai.request.model': 'claude-3-haiku-20240307',
 'gen_ai.request.temperature': 0.7,
 'gen_ai.response.id': 'msg_mock123',
Expand DownExpand Up@@ -638,6 +637,7 @@ describe('Anthropic integration', () => {
 transaction: {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: Last message is large and gets truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'messages',
Expand All@@ -653,6 +653,24 @@ describe('Anthropic integration', () => {
 origin: 'auto.ai.anthropic',
 status: 'ok',
 }),
 // Second call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'messages',
 'sentry.op': 'gen_ai.messages',
 'sentry.origin': 'auto.ai.anthropic',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-haiku-20240307',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 { role: 'user', content: 'This is a small message that fits within the limit' },
 ]),
 }),
 description: 'messages claude-3-haiku-20240307',
 op: 'gen_ai.messages',
 origin: 'auto.ai.anthropic',
 status: 'ok',
 }),
 ]),
 },
 })
Expand All@@ -677,6 +695,7 @@ describe('Anthropic integration', () => {
 'sentry.origin': 'auto.ai.anthropic',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-haiku-20240307',
 // Only the last message (with filtered media) should be kept
 'gen_ai.request.messages': JSON.stringify([
 {
 role: 'user',
Expand All@@ -691,10 +710,6 @@ describe('Anthropic integration', () => {
 },
 ],
 },
 {
 role: 'user',
 content: 'what number is this?',
 },
 ]),
 }),
 description: 'messages claude-3-haiku-20240307',
Expand Down

24 changes: 20 additions & 4 deletions
...ckages/node-integration-tests/suites/tracing/google-genai/scenario-message-truncation.mjs

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -43,12 +43,11 @@ async function run() {

 const client = instrumentGoogleGenAIClient(mockClient);

 // Create 3 large messages where:
 // - First 2 messages are very large (will be dropped)
 // - Last message is large but will be truncated to fit within the 20KB limit
 // Test 1: Given an array of messages only the last message should be kept
 // The last message should be truncated to fit within the 20KB limit
 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 await client.models.generateContent({
 model: 'gemini-1.5-flash',
Expand All@@ -63,6 +62,23 @@ async function run() {
 { role: 'user', parts: [{ text: largeContent3 }] },
 ],
 });

 // Test 2: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await client.models.generateContent({
 model: 'gemini-1.5-flash',
 config: {
 temperature: 0.7,
 topP: 0.9,
 maxOutputTokens: 100,
 },
 contents: [
 { role: 'user', parts: [{ text: largeContent1 }] },
 { role: 'model', parts: [{ text: largeContent2 }] },
 { role: 'user', parts: [{ text: smallContent }] },
 ],
 });
 });
}

Expand Down

26 changes: 23 additions & 3 deletions
dev-packages/node-integration-tests/suites/tracing/google-genai/test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -94,9 +94,7 @@ describe('Google GenAI integration', () => {
 'gen_ai.request.temperature': 0.8,
 'gen_ai.request.top_p': 0.9,
 'gen_ai.request.max_tokens': 150,
 'gen_ai.request.messages': expect.stringMatching(
 /\[\{"role":"system","content":"You are a friendly robot who likes to be funny."\},/,
 ), // Should include history when recordInputs: true
 'gen_ai.request.messages': '[{"role":"user","parts":[{"text":"Hello, how are you?"}]}]',
 }),
 description: 'chat gemini-1.5-pro create',
 op: 'gen_ai.chat',
Expand DownExpand Up@@ -504,6 +502,7 @@ describe('Google GenAI integration', () => {
 transaction: {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: Last message is large and gets truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'models',
Expand All@@ -521,6 +520,27 @@ describe('Google GenAI integration', () => {
 origin: 'auto.ai.google_genai',
 status: 'ok',
 }),
 // Second call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'models',
 'sentry.op': 'gen_ai.models',
 'sentry.origin': 'auto.ai.google_genai',
 'gen_ai.system': 'google_genai',
 'gen_ai.request.model': 'gemini-1.5-flash',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 {
 role: 'user',
 parts: [{ text: 'This is a small message that fits within the limit' }],
 },
 ]),
 }),
 description: 'models gemini-1.5-flash',
 op: 'gen_ai.models',
 origin: 'auto.ai.google_genai',
 status: 'ok',
 }),
 ]),
 },
 })
Expand Down

18 changes: 14 additions & 4 deletions
dev-packages/node-integration-tests/suites/tracing/langchain/scenario-message-truncation.mjs

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -51,17 +51,27 @@ async function run() {

 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 // Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3 + largeContent2);
 // Test 1: Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3);

 // Create an array of messages that gets truncated to only include the last message (result should again contain only Cs)
 // Test 2: Create an array of messages that gets truncated to only include the last message
 // The last message should be truncated to fit within the 20KB limit (result should again contain only Cs)
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: largeContent3 },
 ]);

 // Test 3: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: smallContent },
 ]);
 });

 await Sentry.flush(2000);
Expand Down

20 changes: 20 additions & 0 deletions
dev-packages/node-integration-tests/suites/tracing/langchain/test.ts

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -198,6 +198,7 @@ describe('LangChain integration', () => {
 const EXPECTED_TRANSACTION_MESSAGE_TRUNCATION = {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: String input truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -213,6 +214,7 @@ describe('LangChain integration', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Second call: Array input, last message truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -228,6 +230,24 @@ describe('LangChain integration', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Third call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
 'sentry.op': 'gen_ai.chat',
 'sentry.origin': 'auto.ai.langchain',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-5-sonnet-20241022',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 { role: 'user', content: 'This is a small message that fits within the limit' },
 ]),
 }),
 description: 'chat claude-3-5-sonnet-20241022',
 op: 'gen_ai.chat',
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 ]),
 };

Expand Down

18 changes: 14 additions & 4 deletions
...ckages/node-integration-tests/suites/tracing/langchain/v1/scenario-message-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -51,17 +51,27 @@ async function run() {

 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 // Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3 + largeContent2);
 // Test 1: Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3);

 // Create an array of messages that gets truncated to only include the last message (result should again contain only Cs)
 // Test 2: Create an array of messages that gets truncated to only include the last message
 // The last message should be truncated to fit within the 20KB limit (result should again contain only Cs)
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: largeContent3 },
 ]);

 // Test 3: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: smallContent },
 ]);
 });

 await Sentry.flush(2000);
Expand Down

20 changes: 20 additions & 0 deletions
dev-packages/node-integration-tests/suites/tracing/langchain/v1/test.ts

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -241,6 +241,7 @@ conditionalTest({ min: 20 })('LangChain integration (v1)', () => {
 const EXPECTED_TRANSACTION_MESSAGE_TRUNCATION = {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: String input truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -256,6 +257,7 @@ conditionalTest({ min: 20 })('LangChain integration (v1)', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Second call: Array input, last message truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -271,6 +273,24 @@ conditionalTest({ min: 20 })('LangChain integration (v1)', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Third call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
 'sentry.op': 'gen_ai.chat',
 'sentry.origin': 'auto.ai.langchain',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-5-sonnet-20241022',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 { role: 'user', content: 'This is a small message that fits within the limit' },
 ]),
 }),
 description: 'chat claude-3-5-sonnet-20241022',
 op: 'gen_ai.chat',
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 ]),
 };

Expand Down

6 changes: 6 additions & 0 deletions
dev-packages/node-integration-tests/suites/tracing/openai/scenario-embeddings.mjs

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -67,6 +67,12 @@ async function run() {
 } catch {
 // Error is expected and handled
 }

 // Third test: embeddings API with multiple inputs
 await client.embeddings.create({
 input: ['First input text', 'Second input text', 'Third input text'],
 model: 'text-embedding-3-small',
 });
 });

 server.close();
Expand Down
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
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try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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nicohrubec
merged 10 commits into

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Jan 21, 2026
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feat(core): simplify truncation logic to only keep the newest message
#18906
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ff334af

feat(core): simplify truncation logic to only keep the newest message


nicohrubec Jan 20, 2026
620d956

more tests


nicohrubec Jan 20, 2026
aaca8da

update test expectations


nicohrubec Jan 20, 2026
4ced95e

yarn fix


nicohrubec Jan 20, 2026
1c45147

revert changes


nicohrubec Jan 20, 2026
30ef964

.


nicohrubec Jan 20, 2026
e5d809d

clean up comments


nicohrubec Jan 21, 2026
52b0e2e

fix embeddings truncation


nicohrubec Jan 21, 2026
e36f8d3

set embeddings as separate attribute and do not truncate


nicohrubec Jan 21, 2026
15215d4

early returns to make it a bit easier to understand


nicohrubec Jan 21, 2026

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9 changes: 5 additions & 4 deletions
dev-packages/node-integration-tests/suites/tracing/anthropic/scenario-media-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -49,10 +49,15 @@ async function run() {
 const client = instrumentAnthropicAiClient(mockClient);

 // Send the image showing the number 3
 // Put the image in the last message so it doesn't get dropped
 await client.messages.create({
 model: 'claude-3-haiku-20240307',
 max_tokens: 1024,
 messages: [
 {
 role: 'user',
 content: 'what number is this?',
 },
 {
 role: 'user',
 content: [
Expand All@@ -66,10 +71,6 @@ async function run() {
 },
 ],
 },
 {
 role: 'user',
 content: 'what number is this?',
 },
 ],
 temperature: 0.7,
 });
Expand Down

21 changes: 17 additions & 4 deletions
dev-packages/node-integration-tests/suites/tracing/anthropic/scenario-message-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -48,12 +48,11 @@ async function run() {

 const client = instrumentAnthropicAiClient(mockClient);

 // Create 3 large messages where:
 // - First 2 messages are very large (will be dropped)
 // - Last message is large but will be truncated to fit within the 20KB limit
 // Test 1: Given an array of messages only the last message should be kept
 // The last message should be truncated to fit within the 20KB limit
 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 await client.messages.create({
 model: 'claude-3-haiku-20240307',
Expand All@@ -65,6 +64,20 @@ async function run() {
 ],
 temperature: 0.7,
 });

 // Test 2: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await client.messages.create({
 model: 'claude-3-haiku-20240307',
 max_tokens: 100,
 messages: [
 { role: 'user', content: largeContent1 },
 { role: 'assistant', content: largeContent2 },
 { role: 'user', content: smallContent },
 ],
 temperature: 0.7,
 });
 });
}

Expand Down

27 changes: 21 additions & 6 deletions
dev-packages/node-integration-tests/suites/tracing/anthropic/test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -86,8 +86,7 @@ describe('Anthropic integration', () => {
 data: expect.objectContaining({
 'gen_ai.operation.name': 'messages',
 'gen_ai.request.max_tokens': 100,
 'gen_ai.request.messages':
 '[{"role":"system","content":"You are a helpful assistant."},{"role":"user","content":"What is the capital of France?"}]',
 'gen_ai.request.messages': '[{"role":"user","content":"What is the capital of France?"}]',
 'gen_ai.request.model': 'claude-3-haiku-20240307',
 'gen_ai.request.temperature': 0.7,
 'gen_ai.response.id': 'msg_mock123',
Expand DownExpand Up@@ -638,6 +637,7 @@ describe('Anthropic integration', () => {
 transaction: {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: Last message is large and gets truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'messages',
Expand All@@ -653,6 +653,24 @@ describe('Anthropic integration', () => {
 origin: 'auto.ai.anthropic',
 status: 'ok',
 }),
 // Second call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'messages',
 'sentry.op': 'gen_ai.messages',
 'sentry.origin': 'auto.ai.anthropic',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-haiku-20240307',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 { role: 'user', content: 'This is a small message that fits within the limit' },
 ]),
 }),
 description: 'messages claude-3-haiku-20240307',
 op: 'gen_ai.messages',
 origin: 'auto.ai.anthropic',
 status: 'ok',
 }),
 ]),
 },
 })
Expand All@@ -677,6 +695,7 @@ describe('Anthropic integration', () => {
 'sentry.origin': 'auto.ai.anthropic',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-haiku-20240307',
 // Only the last message (with filtered media) should be kept
 'gen_ai.request.messages': JSON.stringify([
 {
 role: 'user',
Expand All@@ -691,10 +710,6 @@ describe('Anthropic integration', () => {
 },
 ],
 },
 {
 role: 'user',
 content: 'what number is this?',
 },
 ]),
 }),
 description: 'messages claude-3-haiku-20240307',
Expand Down

24 changes: 20 additions & 4 deletions
...ckages/node-integration-tests/suites/tracing/google-genai/scenario-message-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -43,12 +43,11 @@ async function run() {

 const client = instrumentGoogleGenAIClient(mockClient);

 // Create 3 large messages where:
 // - First 2 messages are very large (will be dropped)
 // - Last message is large but will be truncated to fit within the 20KB limit
 // Test 1: Given an array of messages only the last message should be kept
 // The last message should be truncated to fit within the 20KB limit
 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 await client.models.generateContent({
 model: 'gemini-1.5-flash',
Expand All@@ -63,6 +62,23 @@ async function run() {
 { role: 'user', parts: [{ text: largeContent3 }] },
 ],
 });

 // Test 2: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await client.models.generateContent({
 model: 'gemini-1.5-flash',
 config: {
 temperature: 0.7,
 topP: 0.9,
 maxOutputTokens: 100,
 },
 contents: [
 { role: 'user', parts: [{ text: largeContent1 }] },
 { role: 'model', parts: [{ text: largeContent2 }] },
 { role: 'user', parts: [{ text: smallContent }] },
 ],
 });
 });
}

Expand Down

26 changes: 23 additions & 3 deletions
dev-packages/node-integration-tests/suites/tracing/google-genai/test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -94,9 +94,7 @@ describe('Google GenAI integration', () => {
 'gen_ai.request.temperature': 0.8,
 'gen_ai.request.top_p': 0.9,
 'gen_ai.request.max_tokens': 150,
 'gen_ai.request.messages': expect.stringMatching(
 /\[\{"role":"system","content":"You are a friendly robot who likes to be funny."\},/,
 ), // Should include history when recordInputs: true
 'gen_ai.request.messages': '[{"role":"user","parts":[{"text":"Hello, how are you?"}]}]',
 }),
 description: 'chat gemini-1.5-pro create',
 op: 'gen_ai.chat',
Expand DownExpand Up@@ -504,6 +502,7 @@ describe('Google GenAI integration', () => {
 transaction: {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: Last message is large and gets truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'models',
Expand All@@ -521,6 +520,27 @@ describe('Google GenAI integration', () => {
 origin: 'auto.ai.google_genai',
 status: 'ok',
 }),
 // Second call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'models',
 'sentry.op': 'gen_ai.models',
 'sentry.origin': 'auto.ai.google_genai',
 'gen_ai.system': 'google_genai',
 'gen_ai.request.model': 'gemini-1.5-flash',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 {
 role: 'user',
 parts: [{ text: 'This is a small message that fits within the limit' }],
 },
 ]),
 }),
 description: 'models gemini-1.5-flash',
 op: 'gen_ai.models',
 origin: 'auto.ai.google_genai',
 status: 'ok',
 }),
 ]),
 },
 })
Expand Down

18 changes: 14 additions & 4 deletions
dev-packages/node-integration-tests/suites/tracing/langchain/scenario-message-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -51,17 +51,27 @@ async function run() {

 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 // Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3 + largeContent2);
 // Test 1: Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3);

 // Create an array of messages that gets truncated to only include the last message (result should again contain only Cs)
 // Test 2: Create an array of messages that gets truncated to only include the last message
 // The last message should be truncated to fit within the 20KB limit (result should again contain only Cs)
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: largeContent3 },
 ]);

 // Test 3: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: smallContent },
 ]);
 });

 await Sentry.flush(2000);
Expand Down

20 changes: 20 additions & 0 deletions
dev-packages/node-integration-tests/suites/tracing/langchain/test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -198,6 +198,7 @@ describe('LangChain integration', () => {
 const EXPECTED_TRANSACTION_MESSAGE_TRUNCATION = {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: String input truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -213,6 +214,7 @@ describe('LangChain integration', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Second call: Array input, last message truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -228,6 +230,24 @@ describe('LangChain integration', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Third call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
 'sentry.op': 'gen_ai.chat',
 'sentry.origin': 'auto.ai.langchain',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-5-sonnet-20241022',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 { role: 'user', content: 'This is a small message that fits within the limit' },
 ]),
 }),
 description: 'chat claude-3-5-sonnet-20241022',
 op: 'gen_ai.chat',
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 ]),
 };

Expand Down

18 changes: 14 additions & 4 deletions
...ckages/node-integration-tests/suites/tracing/langchain/v1/scenario-message-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -51,17 +51,27 @@ async function run() {

 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 // Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3 + largeContent2);
 // Test 1: Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3);

 // Create an array of messages that gets truncated to only include the last message (result should again contain only Cs)
 // Test 2: Create an array of messages that gets truncated to only include the last message
 // The last message should be truncated to fit within the 20KB limit (result should again contain only Cs)
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: largeContent3 },
 ]);

 // Test 3: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: smallContent },
 ]);
 });

 await Sentry.flush(2000);
Expand Down

20 changes: 20 additions & 0 deletions
dev-packages/node-integration-tests/suites/tracing/langchain/v1/test.ts

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -241,6 +241,7 @@ conditionalTest({ min: 20 })('LangChain integration (v1)', () => {
 const EXPECTED_TRANSACTION_MESSAGE_TRUNCATION = {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: String input truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -256,6 +257,7 @@ conditionalTest({ min: 20 })('LangChain integration (v1)', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Second call: Array input, last message truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -271,6 +273,24 @@ conditionalTest({ min: 20 })('LangChain integration (v1)', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Third call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
 'sentry.op': 'gen_ai.chat',
 'sentry.origin': 'auto.ai.langchain',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-5-sonnet-20241022',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 { role: 'user', content: 'This is a small message that fits within the limit' },
 ]),
 }),
 description: 'chat claude-3-5-sonnet-20241022',
 op: 'gen_ai.chat',
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 ]),
 };

Expand Down

6 changes: 6 additions & 0 deletions
dev-packages/node-integration-tests/suites/tracing/openai/scenario-embeddings.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -67,6 +67,12 @@ async function run() {
 } catch {
 // Error is expected and handled
 }

 // Third test: embeddings API with multiple inputs
 await client.embeddings.create({
 input: ['First input text', 'Second input text', 'Third input text'],
 model: 'text-embedding-3-small',
 });
 });

 server.close();
Expand Down
Loading
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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feat(core): simplify truncation logic to only keep the newest message#18906

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nicohrubec
merged 10 commits into

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Jan 21, 2026
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feat(core): simplify truncation logic to only keep the newest message
#18906
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ff334af

feat(core): simplify truncation logic to only keep the newest message


nicohrubec Jan 20, 2026
620d956

more tests


nicohrubec Jan 20, 2026
aaca8da

update test expectations


nicohrubec Jan 20, 2026
4ced95e

yarn fix


nicohrubec Jan 20, 2026
1c45147

revert changes


nicohrubec Jan 20, 2026
30ef964

.


nicohrubec Jan 20, 2026
e5d809d

clean up comments


nicohrubec Jan 21, 2026
52b0e2e

fix embeddings truncation


nicohrubec Jan 21, 2026
e36f8d3

set embeddings as separate attribute and do not truncate


nicohrubec Jan 21, 2026
15215d4

early returns to make it a bit easier to understand


nicohrubec Jan 21, 2026

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9 changes: 5 additions & 4 deletions
dev-packages/node-integration-tests/suites/tracing/anthropic/scenario-media-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -49,10 +49,15 @@ async function run() {
 const client = instrumentAnthropicAiClient(mockClient);

 // Send the image showing the number 3
 // Put the image in the last message so it doesn't get dropped
 await client.messages.create({
 model: 'claude-3-haiku-20240307',
 max_tokens: 1024,
 messages: [
 {
 role: 'user',
 content: 'what number is this?',
 },
 {
 role: 'user',
 content: [
Expand All@@ -66,10 +71,6 @@ async function run() {
 },
 ],
 },
 {
 role: 'user',
 content: 'what number is this?',
 },
 ],
 temperature: 0.7,
 });
Expand Down

21 changes: 17 additions & 4 deletions
dev-packages/node-integration-tests/suites/tracing/anthropic/scenario-message-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -48,12 +48,11 @@ async function run() {

 const client = instrumentAnthropicAiClient(mockClient);

 // Create 3 large messages where:
 // - First 2 messages are very large (will be dropped)
 // - Last message is large but will be truncated to fit within the 20KB limit
 // Test 1: Given an array of messages only the last message should be kept
 // The last message should be truncated to fit within the 20KB limit
 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 await client.messages.create({
 model: 'claude-3-haiku-20240307',
Expand All@@ -65,6 +64,20 @@ async function run() {
 ],
 temperature: 0.7,
 });

 // Test 2: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await client.messages.create({
 model: 'claude-3-haiku-20240307',
 max_tokens: 100,
 messages: [
 { role: 'user', content: largeContent1 },
 { role: 'assistant', content: largeContent2 },
 { role: 'user', content: smallContent },
 ],
 temperature: 0.7,
 });
 });
}

Expand Down

27 changes: 21 additions & 6 deletions
dev-packages/node-integration-tests/suites/tracing/anthropic/test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -86,8 +86,7 @@ describe('Anthropic integration', () => {
 data: expect.objectContaining({
 'gen_ai.operation.name': 'messages',
 'gen_ai.request.max_tokens': 100,
 'gen_ai.request.messages':
 '[{"role":"system","content":"You are a helpful assistant."},{"role":"user","content":"What is the capital of France?"}]',
 'gen_ai.request.messages': '[{"role":"user","content":"What is the capital of France?"}]',
 'gen_ai.request.model': 'claude-3-haiku-20240307',
 'gen_ai.request.temperature': 0.7,
 'gen_ai.response.id': 'msg_mock123',
Expand DownExpand Up@@ -638,6 +637,7 @@ describe('Anthropic integration', () => {
 transaction: {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: Last message is large and gets truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'messages',
Expand All@@ -653,6 +653,24 @@ describe('Anthropic integration', () => {
 origin: 'auto.ai.anthropic',
 status: 'ok',
 }),
 // Second call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'messages',
 'sentry.op': 'gen_ai.messages',
 'sentry.origin': 'auto.ai.anthropic',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-haiku-20240307',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 { role: 'user', content: 'This is a small message that fits within the limit' },
 ]),
 }),
 description: 'messages claude-3-haiku-20240307',
 op: 'gen_ai.messages',
 origin: 'auto.ai.anthropic',
 status: 'ok',
 }),
 ]),
 },
 })
Expand All@@ -677,6 +695,7 @@ describe('Anthropic integration', () => {
 'sentry.origin': 'auto.ai.anthropic',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-haiku-20240307',
 // Only the last message (with filtered media) should be kept
 'gen_ai.request.messages': JSON.stringify([
 {
 role: 'user',
Expand All@@ -691,10 +710,6 @@ describe('Anthropic integration', () => {
 },
 ],
 },
 {
 role: 'user',
 content: 'what number is this?',
 },
 ]),
 }),
 description: 'messages claude-3-haiku-20240307',
Expand Down

24 changes: 20 additions & 4 deletions
...ckages/node-integration-tests/suites/tracing/google-genai/scenario-message-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -43,12 +43,11 @@ async function run() {

 const client = instrumentGoogleGenAIClient(mockClient);

 // Create 3 large messages where:
 // - First 2 messages are very large (will be dropped)
 // - Last message is large but will be truncated to fit within the 20KB limit
 // Test 1: Given an array of messages only the last message should be kept
 // The last message should be truncated to fit within the 20KB limit
 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 await client.models.generateContent({
 model: 'gemini-1.5-flash',
Expand All@@ -63,6 +62,23 @@ async function run() {
 { role: 'user', parts: [{ text: largeContent3 }] },
 ],
 });

 // Test 2: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await client.models.generateContent({
 model: 'gemini-1.5-flash',
 config: {
 temperature: 0.7,
 topP: 0.9,
 maxOutputTokens: 100,
 },
 contents: [
 { role: 'user', parts: [{ text: largeContent1 }] },
 { role: 'model', parts: [{ text: largeContent2 }] },
 { role: 'user', parts: [{ text: smallContent }] },
 ],
 });
 });
}

Expand Down

26 changes: 23 additions & 3 deletions
dev-packages/node-integration-tests/suites/tracing/google-genai/test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -94,9 +94,7 @@ describe('Google GenAI integration', () => {
 'gen_ai.request.temperature': 0.8,
 'gen_ai.request.top_p': 0.9,
 'gen_ai.request.max_tokens': 150,
 'gen_ai.request.messages': expect.stringMatching(
 /\[\{"role":"system","content":"You are a friendly robot who likes to be funny."\},/,
 ), // Should include history when recordInputs: true
 'gen_ai.request.messages': '[{"role":"user","parts":[{"text":"Hello, how are you?"}]}]',
 }),
 description: 'chat gemini-1.5-pro create',
 op: 'gen_ai.chat',
Expand DownExpand Up@@ -504,6 +502,7 @@ describe('Google GenAI integration', () => {
 transaction: {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: Last message is large and gets truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'models',
Expand All@@ -521,6 +520,27 @@ describe('Google GenAI integration', () => {
 origin: 'auto.ai.google_genai',
 status: 'ok',
 }),
 // Second call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'models',
 'sentry.op': 'gen_ai.models',
 'sentry.origin': 'auto.ai.google_genai',
 'gen_ai.system': 'google_genai',
 'gen_ai.request.model': 'gemini-1.5-flash',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 {
 role: 'user',
 parts: [{ text: 'This is a small message that fits within the limit' }],
 },
 ]),
 }),
 description: 'models gemini-1.5-flash',
 op: 'gen_ai.models',
 origin: 'auto.ai.google_genai',
 status: 'ok',
 }),
 ]),
 },
 })
Expand Down

18 changes: 14 additions & 4 deletions
dev-packages/node-integration-tests/suites/tracing/langchain/scenario-message-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -51,17 +51,27 @@ async function run() {

 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 // Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3 + largeContent2);
 // Test 1: Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3);

 // Create an array of messages that gets truncated to only include the last message (result should again contain only Cs)
 // Test 2: Create an array of messages that gets truncated to only include the last message
 // The last message should be truncated to fit within the 20KB limit (result should again contain only Cs)
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: largeContent3 },
 ]);

 // Test 3: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: smallContent },
 ]);
 });

 await Sentry.flush(2000);
Expand Down

20 changes: 20 additions & 0 deletions
dev-packages/node-integration-tests/suites/tracing/langchain/test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -198,6 +198,7 @@ describe('LangChain integration', () => {
 const EXPECTED_TRANSACTION_MESSAGE_TRUNCATION = {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: String input truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -213,6 +214,7 @@ describe('LangChain integration', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Second call: Array input, last message truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -228,6 +230,24 @@ describe('LangChain integration', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Third call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
 'sentry.op': 'gen_ai.chat',
 'sentry.origin': 'auto.ai.langchain',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-5-sonnet-20241022',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 { role: 'user', content: 'This is a small message that fits within the limit' },
 ]),
 }),
 description: 'chat claude-3-5-sonnet-20241022',
 op: 'gen_ai.chat',
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 ]),
 };

Expand Down

18 changes: 14 additions & 4 deletions
...ckages/node-integration-tests/suites/tracing/langchain/v1/scenario-message-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -51,17 +51,27 @@ async function run() {

 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 // Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3 + largeContent2);
 // Test 1: Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3);

 // Create an array of messages that gets truncated to only include the last message (result should again contain only Cs)
 // Test 2: Create an array of messages that gets truncated to only include the last message
 // The last message should be truncated to fit within the 20KB limit (result should again contain only Cs)
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: largeContent3 },
 ]);

 // Test 3: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: smallContent },
 ]);
 });

 await Sentry.flush(2000);
Expand Down

20 changes: 20 additions & 0 deletions
dev-packages/node-integration-tests/suites/tracing/langchain/v1/test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -241,6 +241,7 @@ conditionalTest({ min: 20 })('LangChain integration (v1)', () => {
 const EXPECTED_TRANSACTION_MESSAGE_TRUNCATION = {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: String input truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -256,6 +257,7 @@ conditionalTest({ min: 20 })('LangChain integration (v1)', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Second call: Array input, last message truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -271,6 +273,24 @@ conditionalTest({ min: 20 })('LangChain integration (v1)', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Third call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
 'sentry.op': 'gen_ai.chat',
 'sentry.origin': 'auto.ai.langchain',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-5-sonnet-20241022',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 { role: 'user', content: 'This is a small message that fits within the limit' },
 ]),
 }),
 description: 'chat claude-3-5-sonnet-20241022',
 op: 'gen_ai.chat',
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 ]),
 };

Expand Down

6 changes: 6 additions & 0 deletions
dev-packages/node-integration-tests/suites/tracing/openai/scenario-embeddings.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -67,6 +67,12 @@ async function run() {
 } catch {
 // Error is expected and handled
 }

 // Third test: embeddings API with multiple inputs
 await client.embeddings.create({
 input: ['First input text', 'Second input text', 'Third input text'],
 model: 'text-embedding-3-small',
 });
 });

 server.close();
Expand Down
Loading
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
feat(core): simplify truncation logic to only keep the newest message#18906

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

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By clicking “Sign up for GitHub”, you agree to our terms of service and
privacy statement. We’ll occasionally send you account related emails.

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Sign in
to your account

 Merged

nicohrubec
merged 10 commits into

from

Jan 21, 2026
 Merged


feat(core): simplify truncation logic to only keep the newest message
#18906
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ff334af

feat(core): simplify truncation logic to only keep the newest message


nicohrubec Jan 20, 2026
620d956

more tests


nicohrubec Jan 20, 2026
aaca8da

update test expectations


nicohrubec Jan 20, 2026
4ced95e

yarn fix


nicohrubec Jan 20, 2026
1c45147

revert changes


nicohrubec Jan 20, 2026
30ef964

.


nicohrubec Jan 20, 2026
e5d809d

clean up comments


nicohrubec Jan 21, 2026
52b0e2e

fix embeddings truncation


nicohrubec Jan 21, 2026
e36f8d3

set embeddings as separate attribute and do not truncate


nicohrubec Jan 21, 2026
15215d4

early returns to make it a bit easier to understand


nicohrubec Jan 21, 2026

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9 changes: 5 additions & 4 deletions
dev-packages/node-integration-tests/suites/tracing/anthropic/scenario-media-truncation.mjs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -49,10 +49,15 @@ async function run() {
 const client = instrumentAnthropicAiClient(mockClient);

 // Send the image showing the number 3
 // Put the image in the last message so it doesn't get dropped
 await client.messages.create({
 model: 'claude-3-haiku-20240307',
 max_tokens: 1024,
 messages: [
 {
 role: 'user',
 content: 'what number is this?',
 },
 {
 role: 'user',
 content: [
Expand All@@ -66,10 +71,6 @@ async function run() {
 },
 ],
 },
 {
 role: 'user',
 content: 'what number is this?',
 },
 ],
 temperature: 0.7,
 });
Expand Down

21 changes: 17 additions & 4 deletions
dev-packages/node-integration-tests/suites/tracing/anthropic/scenario-message-truncation.mjs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -48,12 +48,11 @@ async function run() {

 const client = instrumentAnthropicAiClient(mockClient);

 // Create 3 large messages where:
 // - First 2 messages are very large (will be dropped)
 // - Last message is large but will be truncated to fit within the 20KB limit
 // Test 1: Given an array of messages only the last message should be kept
 // The last message should be truncated to fit within the 20KB limit
 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 await client.messages.create({
 model: 'claude-3-haiku-20240307',
Expand All@@ -65,6 +64,20 @@ async function run() {
 ],
 temperature: 0.7,
 });

 // Test 2: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await client.messages.create({
 model: 'claude-3-haiku-20240307',
 max_tokens: 100,
 messages: [
 { role: 'user', content: largeContent1 },
 { role: 'assistant', content: largeContent2 },
 { role: 'user', content: smallContent },
 ],
 temperature: 0.7,
 });
 });
}

Expand Down

27 changes: 21 additions & 6 deletions
dev-packages/node-integration-tests/suites/tracing/anthropic/test.ts

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -86,8 +86,7 @@ describe('Anthropic integration', () => {
 data: expect.objectContaining({
 'gen_ai.operation.name': 'messages',
 'gen_ai.request.max_tokens': 100,
 'gen_ai.request.messages':
 '[{"role":"system","content":"You are a helpful assistant."},{"role":"user","content":"What is the capital of France?"}]',
 'gen_ai.request.messages': '[{"role":"user","content":"What is the capital of France?"}]',
 'gen_ai.request.model': 'claude-3-haiku-20240307',
 'gen_ai.request.temperature': 0.7,
 'gen_ai.response.id': 'msg_mock123',
Expand DownExpand Up@@ -638,6 +637,7 @@ describe('Anthropic integration', () => {
 transaction: {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: Last message is large and gets truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'messages',
Expand All@@ -653,6 +653,24 @@ describe('Anthropic integration', () => {
 origin: 'auto.ai.anthropic',
 status: 'ok',
 }),
 // Second call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'messages',
 'sentry.op': 'gen_ai.messages',
 'sentry.origin': 'auto.ai.anthropic',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-haiku-20240307',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 { role: 'user', content: 'This is a small message that fits within the limit' },
 ]),
 }),
 description: 'messages claude-3-haiku-20240307',
 op: 'gen_ai.messages',
 origin: 'auto.ai.anthropic',
 status: 'ok',
 }),
 ]),
 },
 })
Expand All@@ -677,6 +695,7 @@ describe('Anthropic integration', () => {
 'sentry.origin': 'auto.ai.anthropic',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-haiku-20240307',
 // Only the last message (with filtered media) should be kept
 'gen_ai.request.messages': JSON.stringify([
 {
 role: 'user',
Expand All@@ -691,10 +710,6 @@ describe('Anthropic integration', () => {
 },
 ],
 },
 {
 role: 'user',
 content: 'what number is this?',
 },
 ]),
 }),
 description: 'messages claude-3-haiku-20240307',
Expand Down

24 changes: 20 additions & 4 deletions
...ckages/node-integration-tests/suites/tracing/google-genai/scenario-message-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -43,12 +43,11 @@ async function run() {

 const client = instrumentGoogleGenAIClient(mockClient);

 // Create 3 large messages where:
 // - First 2 messages are very large (will be dropped)
 // - Last message is large but will be truncated to fit within the 20KB limit
 // Test 1: Given an array of messages only the last message should be kept
 // The last message should be truncated to fit within the 20KB limit
 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 await client.models.generateContent({
 model: 'gemini-1.5-flash',
Expand All@@ -63,6 +62,23 @@ async function run() {
 { role: 'user', parts: [{ text: largeContent3 }] },
 ],
 });

 // Test 2: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await client.models.generateContent({
 model: 'gemini-1.5-flash',
 config: {
 temperature: 0.7,
 topP: 0.9,
 maxOutputTokens: 100,
 },
 contents: [
 { role: 'user', parts: [{ text: largeContent1 }] },
 { role: 'model', parts: [{ text: largeContent2 }] },
 { role: 'user', parts: [{ text: smallContent }] },
 ],
 });
 });
}

Expand Down

26 changes: 23 additions & 3 deletions
dev-packages/node-integration-tests/suites/tracing/google-genai/test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -94,9 +94,7 @@ describe('Google GenAI integration', () => {
 'gen_ai.request.temperature': 0.8,
 'gen_ai.request.top_p': 0.9,
 'gen_ai.request.max_tokens': 150,
 'gen_ai.request.messages': expect.stringMatching(
 /\[\{"role":"system","content":"You are a friendly robot who likes to be funny."\},/,
 ), // Should include history when recordInputs: true
 'gen_ai.request.messages': '[{"role":"user","parts":[{"text":"Hello, how are you?"}]}]',
 }),
 description: 'chat gemini-1.5-pro create',
 op: 'gen_ai.chat',
Expand DownExpand Up@@ -504,6 +502,7 @@ describe('Google GenAI integration', () => {
 transaction: {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: Last message is large and gets truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'models',
Expand All@@ -521,6 +520,27 @@ describe('Google GenAI integration', () => {
 origin: 'auto.ai.google_genai',
 status: 'ok',
 }),
 // Second call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'models',
 'sentry.op': 'gen_ai.models',
 'sentry.origin': 'auto.ai.google_genai',
 'gen_ai.system': 'google_genai',
 'gen_ai.request.model': 'gemini-1.5-flash',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 {
 role: 'user',
 parts: [{ text: 'This is a small message that fits within the limit' }],
 },
 ]),
 }),
 description: 'models gemini-1.5-flash',
 op: 'gen_ai.models',
 origin: 'auto.ai.google_genai',
 status: 'ok',
 }),
 ]),
 },
 })
Expand Down

18 changes: 14 additions & 4 deletions
dev-packages/node-integration-tests/suites/tracing/langchain/scenario-message-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -51,17 +51,27 @@ async function run() {

 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 // Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3 + largeContent2);
 // Test 1: Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3);

 // Create an array of messages that gets truncated to only include the last message (result should again contain only Cs)
 // Test 2: Create an array of messages that gets truncated to only include the last message
 // The last message should be truncated to fit within the 20KB limit (result should again contain only Cs)
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: largeContent3 },
 ]);

 // Test 3: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: smallContent },
 ]);
 });

 await Sentry.flush(2000);
Expand Down

20 changes: 20 additions & 0 deletions
dev-packages/node-integration-tests/suites/tracing/langchain/test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -198,6 +198,7 @@ describe('LangChain integration', () => {
 const EXPECTED_TRANSACTION_MESSAGE_TRUNCATION = {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: String input truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -213,6 +214,7 @@ describe('LangChain integration', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Second call: Array input, last message truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -228,6 +230,24 @@ describe('LangChain integration', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Third call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
 'sentry.op': 'gen_ai.chat',
 'sentry.origin': 'auto.ai.langchain',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-5-sonnet-20241022',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 { role: 'user', content: 'This is a small message that fits within the limit' },
 ]),
 }),
 description: 'chat claude-3-5-sonnet-20241022',
 op: 'gen_ai.chat',
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 ]),
 };

Expand Down

18 changes: 14 additions & 4 deletions
...ckages/node-integration-tests/suites/tracing/langchain/v1/scenario-message-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -51,17 +51,27 @@ async function run() {

 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 // Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3 + largeContent2);
 // Test 1: Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3);

 // Create an array of messages that gets truncated to only include the last message (result should again contain only Cs)
 // Test 2: Create an array of messages that gets truncated to only include the last message
 // The last message should be truncated to fit within the 20KB limit (result should again contain only Cs)
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: largeContent3 },
 ]);

 // Test 3: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: smallContent },
 ]);
 });

 await Sentry.flush(2000);
Expand Down

20 changes: 20 additions & 0 deletions
dev-packages/node-integration-tests/suites/tracing/langchain/v1/test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -241,6 +241,7 @@ conditionalTest({ min: 20 })('LangChain integration (v1)', () => {
 const EXPECTED_TRANSACTION_MESSAGE_TRUNCATION = {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: String input truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -256,6 +257,7 @@ conditionalTest({ min: 20 })('LangChain integration (v1)', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Second call: Array input, last message truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -271,6 +273,24 @@ conditionalTest({ min: 20 })('LangChain integration (v1)', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Third call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
 'sentry.op': 'gen_ai.chat',
 'sentry.origin': 'auto.ai.langchain',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-5-sonnet-20241022',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 { role: 'user', content: 'This is a small message that fits within the limit' },
 ]),
 }),
 description: 'chat claude-3-5-sonnet-20241022',
 op: 'gen_ai.chat',
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 ]),
 };

Expand Down

6 changes: 6 additions & 0 deletions
dev-packages/node-integration-tests/suites/tracing/openai/scenario-embeddings.mjs

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Original file line numberDiff line numberDiff line change
Expand Up@@ -67,6 +67,12 @@ async function run() {
 } catch {
 // Error is expected and handled
 }

 // Third test: embeddings API with multiple inputs
 await client.embeddings.create({
 input: ['First input text', 'Second input text', 'Third input text'],
 model: 'text-embedding-3-small',
 });
 });

 server.close();
Expand Down
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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nicohrubec
merged 10 commits into

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Jan 21, 2026
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feat(core): simplify truncation logic to only keep the newest message
#18906
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ff334af

feat(core): simplify truncation logic to only keep the newest message


nicohrubec Jan 20, 2026
620d956

more tests


nicohrubec Jan 20, 2026
aaca8da

update test expectations


nicohrubec Jan 20, 2026
4ced95e

yarn fix


nicohrubec Jan 20, 2026
1c45147

revert changes


nicohrubec Jan 20, 2026
30ef964

.


nicohrubec Jan 20, 2026
e5d809d

clean up comments


nicohrubec Jan 21, 2026
52b0e2e

fix embeddings truncation


nicohrubec Jan 21, 2026
e36f8d3

set embeddings as separate attribute and do not truncate


nicohrubec Jan 21, 2026
15215d4

early returns to make it a bit easier to understand


nicohrubec Jan 21, 2026

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9 changes: 5 additions & 4 deletions
dev-packages/node-integration-tests/suites/tracing/anthropic/scenario-media-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -49,10 +49,15 @@ async function run() {
 const client = instrumentAnthropicAiClient(mockClient);

 // Send the image showing the number 3
 // Put the image in the last message so it doesn't get dropped
 await client.messages.create({
 model: 'claude-3-haiku-20240307',
 max_tokens: 1024,
 messages: [
 {
 role: 'user',
 content: 'what number is this?',
 },
 {
 role: 'user',
 content: [
Expand All@@ -66,10 +71,6 @@ async function run() {
 },
 ],
 },
 {
 role: 'user',
 content: 'what number is this?',
 },
 ],
 temperature: 0.7,
 });
Expand Down

21 changes: 17 additions & 4 deletions
dev-packages/node-integration-tests/suites/tracing/anthropic/scenario-message-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -48,12 +48,11 @@ async function run() {

 const client = instrumentAnthropicAiClient(mockClient);

 // Create 3 large messages where:
 // - First 2 messages are very large (will be dropped)
 // - Last message is large but will be truncated to fit within the 20KB limit
 // Test 1: Given an array of messages only the last message should be kept
 // The last message should be truncated to fit within the 20KB limit
 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 await client.messages.create({
 model: 'claude-3-haiku-20240307',
Expand All@@ -65,6 +64,20 @@ async function run() {
 ],
 temperature: 0.7,
 });

 // Test 2: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await client.messages.create({
 model: 'claude-3-haiku-20240307',
 max_tokens: 100,
 messages: [
 { role: 'user', content: largeContent1 },
 { role: 'assistant', content: largeContent2 },
 { role: 'user', content: smallContent },
 ],
 temperature: 0.7,
 });
 });
}

Expand Down

27 changes: 21 additions & 6 deletions
dev-packages/node-integration-tests/suites/tracing/anthropic/test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -86,8 +86,7 @@ describe('Anthropic integration', () => {
 data: expect.objectContaining({
 'gen_ai.operation.name': 'messages',
 'gen_ai.request.max_tokens': 100,
 'gen_ai.request.messages':
 '[{"role":"system","content":"You are a helpful assistant."},{"role":"user","content":"What is the capital of France?"}]',
 'gen_ai.request.messages': '[{"role":"user","content":"What is the capital of France?"}]',
 'gen_ai.request.model': 'claude-3-haiku-20240307',
 'gen_ai.request.temperature': 0.7,
 'gen_ai.response.id': 'msg_mock123',
Expand DownExpand Up@@ -638,6 +637,7 @@ describe('Anthropic integration', () => {
 transaction: {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: Last message is large and gets truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'messages',
Expand All@@ -653,6 +653,24 @@ describe('Anthropic integration', () => {
 origin: 'auto.ai.anthropic',
 status: 'ok',
 }),
 // Second call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'messages',
 'sentry.op': 'gen_ai.messages',
 'sentry.origin': 'auto.ai.anthropic',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-haiku-20240307',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 { role: 'user', content: 'This is a small message that fits within the limit' },
 ]),
 }),
 description: 'messages claude-3-haiku-20240307',
 op: 'gen_ai.messages',
 origin: 'auto.ai.anthropic',
 status: 'ok',
 }),
 ]),
 },
 })
Expand All@@ -677,6 +695,7 @@ describe('Anthropic integration', () => {
 'sentry.origin': 'auto.ai.anthropic',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-haiku-20240307',
 // Only the last message (with filtered media) should be kept
 'gen_ai.request.messages': JSON.stringify([
 {
 role: 'user',
Expand All@@ -691,10 +710,6 @@ describe('Anthropic integration', () => {
 },
 ],
 },
 {
 role: 'user',
 content: 'what number is this?',
 },
 ]),
 }),
 description: 'messages claude-3-haiku-20240307',
Expand Down

24 changes: 20 additions & 4 deletions
...ckages/node-integration-tests/suites/tracing/google-genai/scenario-message-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -43,12 +43,11 @@ async function run() {

 const client = instrumentGoogleGenAIClient(mockClient);

 // Create 3 large messages where:
 // - First 2 messages are very large (will be dropped)
 // - Last message is large but will be truncated to fit within the 20KB limit
 // Test 1: Given an array of messages only the last message should be kept
 // The last message should be truncated to fit within the 20KB limit
 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 await client.models.generateContent({
 model: 'gemini-1.5-flash',
Expand All@@ -63,6 +62,23 @@ async function run() {
 { role: 'user', parts: [{ text: largeContent3 }] },
 ],
 });

 // Test 2: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await client.models.generateContent({
 model: 'gemini-1.5-flash',
 config: {
 temperature: 0.7,
 topP: 0.9,
 maxOutputTokens: 100,
 },
 contents: [
 { role: 'user', parts: [{ text: largeContent1 }] },
 { role: 'model', parts: [{ text: largeContent2 }] },
 { role: 'user', parts: [{ text: smallContent }] },
 ],
 });
 });
}

Expand Down

26 changes: 23 additions & 3 deletions
dev-packages/node-integration-tests/suites/tracing/google-genai/test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -94,9 +94,7 @@ describe('Google GenAI integration', () => {
 'gen_ai.request.temperature': 0.8,
 'gen_ai.request.top_p': 0.9,
 'gen_ai.request.max_tokens': 150,
 'gen_ai.request.messages': expect.stringMatching(
 /\[\{"role":"system","content":"You are a friendly robot who likes to be funny."\},/,
 ), // Should include history when recordInputs: true
 'gen_ai.request.messages': '[{"role":"user","parts":[{"text":"Hello, how are you?"}]}]',
 }),
 description: 'chat gemini-1.5-pro create',
 op: 'gen_ai.chat',
Expand DownExpand Up@@ -504,6 +502,7 @@ describe('Google GenAI integration', () => {
 transaction: {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: Last message is large and gets truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'models',
Expand All@@ -521,6 +520,27 @@ describe('Google GenAI integration', () => {
 origin: 'auto.ai.google_genai',
 status: 'ok',
 }),
 // Second call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'models',
 'sentry.op': 'gen_ai.models',
 'sentry.origin': 'auto.ai.google_genai',
 'gen_ai.system': 'google_genai',
 'gen_ai.request.model': 'gemini-1.5-flash',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 {
 role: 'user',
 parts: [{ text: 'This is a small message that fits within the limit' }],
 },
 ]),
 }),
 description: 'models gemini-1.5-flash',
 op: 'gen_ai.models',
 origin: 'auto.ai.google_genai',
 status: 'ok',
 }),
 ]),
 },
 })
Expand Down

18 changes: 14 additions & 4 deletions
dev-packages/node-integration-tests/suites/tracing/langchain/scenario-message-truncation.mjs

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -51,17 +51,27 @@ async function run() {

 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 // Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3 + largeContent2);
 // Test 1: Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3);

 // Create an array of messages that gets truncated to only include the last message (result should again contain only Cs)
 // Test 2: Create an array of messages that gets truncated to only include the last message
 // The last message should be truncated to fit within the 20KB limit (result should again contain only Cs)
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: largeContent3 },
 ]);

 // Test 3: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: smallContent },
 ]);
 });

 await Sentry.flush(2000);
Expand Down

20 changes: 20 additions & 0 deletions
dev-packages/node-integration-tests/suites/tracing/langchain/test.ts

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -198,6 +198,7 @@ describe('LangChain integration', () => {
 const EXPECTED_TRANSACTION_MESSAGE_TRUNCATION = {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: String input truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -213,6 +214,7 @@ describe('LangChain integration', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Second call: Array input, last message truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -228,6 +230,24 @@ describe('LangChain integration', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Third call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
 'sentry.op': 'gen_ai.chat',
 'sentry.origin': 'auto.ai.langchain',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-5-sonnet-20241022',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 { role: 'user', content: 'This is a small message that fits within the limit' },
 ]),
 }),
 description: 'chat claude-3-5-sonnet-20241022',
 op: 'gen_ai.chat',
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 ]),
 };

Expand Down

18 changes: 14 additions & 4 deletions
...ckages/node-integration-tests/suites/tracing/langchain/v1/scenario-message-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -51,17 +51,27 @@ async function run() {

 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 // Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3 + largeContent2);
 // Test 1: Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3);

 // Create an array of messages that gets truncated to only include the last message (result should again contain only Cs)
 // Test 2: Create an array of messages that gets truncated to only include the last message
 // The last message should be truncated to fit within the 20KB limit (result should again contain only Cs)
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: largeContent3 },
 ]);

 // Test 3: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: smallContent },
 ]);
 });

 await Sentry.flush(2000);
Expand Down

20 changes: 20 additions & 0 deletions
dev-packages/node-integration-tests/suites/tracing/langchain/v1/test.ts

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -241,6 +241,7 @@ conditionalTest({ min: 20 })('LangChain integration (v1)', () => {
 const EXPECTED_TRANSACTION_MESSAGE_TRUNCATION = {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: String input truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -256,6 +257,7 @@ conditionalTest({ min: 20 })('LangChain integration (v1)', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Second call: Array input, last message truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -271,6 +273,24 @@ conditionalTest({ min: 20 })('LangChain integration (v1)', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Third call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
 'sentry.op': 'gen_ai.chat',
 'sentry.origin': 'auto.ai.langchain',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-5-sonnet-20241022',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 { role: 'user', content: 'This is a small message that fits within the limit' },
 ]),
 }),
 description: 'chat claude-3-5-sonnet-20241022',
 op: 'gen_ai.chat',
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 ]),
 };

Expand Down

6 changes: 6 additions & 0 deletions
dev-packages/node-integration-tests/suites/tracing/openai/scenario-embeddings.mjs

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -67,6 +67,12 @@ async function run() {
 } catch {
 // Error is expected and handled
 }

 // Third test: embeddings API with multiple inputs
 await client.embeddings.create({
 input: ['First input text', 'Second input text', 'Third input text'],
 model: 'text-embedding-3-small',
 });
 });

 server.close();
Expand Down
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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nicohrubec
merged 10 commits into

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Jan 21, 2026
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feat(core): simplify truncation logic to only keep the newest message
#18906
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ff334af

feat(core): simplify truncation logic to only keep the newest message


nicohrubec Jan 20, 2026
620d956

more tests


nicohrubec Jan 20, 2026
aaca8da

update test expectations


nicohrubec Jan 20, 2026
4ced95e

yarn fix


nicohrubec Jan 20, 2026
1c45147

revert changes


nicohrubec Jan 20, 2026
30ef964

.


nicohrubec Jan 20, 2026
e5d809d

clean up comments


nicohrubec Jan 21, 2026
52b0e2e

fix embeddings truncation


nicohrubec Jan 21, 2026
e36f8d3

set embeddings as separate attribute and do not truncate


nicohrubec Jan 21, 2026
15215d4

early returns to make it a bit easier to understand


nicohrubec Jan 21, 2026

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9 changes: 5 additions & 4 deletions
dev-packages/node-integration-tests/suites/tracing/anthropic/scenario-media-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -49,10 +49,15 @@ async function run() {
 const client = instrumentAnthropicAiClient(mockClient);

 // Send the image showing the number 3
 // Put the image in the last message so it doesn't get dropped
 await client.messages.create({
 model: 'claude-3-haiku-20240307',
 max_tokens: 1024,
 messages: [
 {
 role: 'user',
 content: 'what number is this?',
 },
 {
 role: 'user',
 content: [
Expand All@@ -66,10 +71,6 @@ async function run() {
 },
 ],
 },
 {
 role: 'user',
 content: 'what number is this?',
 },
 ],
 temperature: 0.7,
 });
Expand Down

21 changes: 17 additions & 4 deletions
dev-packages/node-integration-tests/suites/tracing/anthropic/scenario-message-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -48,12 +48,11 @@ async function run() {

 const client = instrumentAnthropicAiClient(mockClient);

 // Create 3 large messages where:
 // - First 2 messages are very large (will be dropped)
 // - Last message is large but will be truncated to fit within the 20KB limit
 // Test 1: Given an array of messages only the last message should be kept
 // The last message should be truncated to fit within the 20KB limit
 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 await client.messages.create({
 model: 'claude-3-haiku-20240307',
Expand All@@ -65,6 +64,20 @@ async function run() {
 ],
 temperature: 0.7,
 });

 // Test 2: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await client.messages.create({
 model: 'claude-3-haiku-20240307',
 max_tokens: 100,
 messages: [
 { role: 'user', content: largeContent1 },
 { role: 'assistant', content: largeContent2 },
 { role: 'user', content: smallContent },
 ],
 temperature: 0.7,
 });
 });
}

Expand Down

27 changes: 21 additions & 6 deletions
dev-packages/node-integration-tests/suites/tracing/anthropic/test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -86,8 +86,7 @@ describe('Anthropic integration', () => {
 data: expect.objectContaining({
 'gen_ai.operation.name': 'messages',
 'gen_ai.request.max_tokens': 100,
 'gen_ai.request.messages':
 '[{"role":"system","content":"You are a helpful assistant."},{"role":"user","content":"What is the capital of France?"}]',
 'gen_ai.request.messages': '[{"role":"user","content":"What is the capital of France?"}]',
 'gen_ai.request.model': 'claude-3-haiku-20240307',
 'gen_ai.request.temperature': 0.7,
 'gen_ai.response.id': 'msg_mock123',
Expand DownExpand Up@@ -638,6 +637,7 @@ describe('Anthropic integration', () => {
 transaction: {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: Last message is large and gets truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'messages',
Expand All@@ -653,6 +653,24 @@ describe('Anthropic integration', () => {
 origin: 'auto.ai.anthropic',
 status: 'ok',
 }),
 // Second call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'messages',
 'sentry.op': 'gen_ai.messages',
 'sentry.origin': 'auto.ai.anthropic',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-haiku-20240307',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 { role: 'user', content: 'This is a small message that fits within the limit' },
 ]),
 }),
 description: 'messages claude-3-haiku-20240307',
 op: 'gen_ai.messages',
 origin: 'auto.ai.anthropic',
 status: 'ok',
 }),
 ]),
 },
 })
Expand All@@ -677,6 +695,7 @@ describe('Anthropic integration', () => {
 'sentry.origin': 'auto.ai.anthropic',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-haiku-20240307',
 // Only the last message (with filtered media) should be kept
 'gen_ai.request.messages': JSON.stringify([
 {
 role: 'user',
Expand All@@ -691,10 +710,6 @@ describe('Anthropic integration', () => {
 },
 ],
 },
 {
 role: 'user',
 content: 'what number is this?',
 },
 ]),
 }),
 description: 'messages claude-3-haiku-20240307',
Expand Down

24 changes: 20 additions & 4 deletions
...ckages/node-integration-tests/suites/tracing/google-genai/scenario-message-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -43,12 +43,11 @@ async function run() {

 const client = instrumentGoogleGenAIClient(mockClient);

 // Create 3 large messages where:
 // - First 2 messages are very large (will be dropped)
 // - Last message is large but will be truncated to fit within the 20KB limit
 // Test 1: Given an array of messages only the last message should be kept
 // The last message should be truncated to fit within the 20KB limit
 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 await client.models.generateContent({
 model: 'gemini-1.5-flash',
Expand All@@ -63,6 +62,23 @@ async function run() {
 { role: 'user', parts: [{ text: largeContent3 }] },
 ],
 });

 // Test 2: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await client.models.generateContent({
 model: 'gemini-1.5-flash',
 config: {
 temperature: 0.7,
 topP: 0.9,
 maxOutputTokens: 100,
 },
 contents: [
 { role: 'user', parts: [{ text: largeContent1 }] },
 { role: 'model', parts: [{ text: largeContent2 }] },
 { role: 'user', parts: [{ text: smallContent }] },
 ],
 });
 });
}

Expand Down

26 changes: 23 additions & 3 deletions
dev-packages/node-integration-tests/suites/tracing/google-genai/test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -94,9 +94,7 @@ describe('Google GenAI integration', () => {
 'gen_ai.request.temperature': 0.8,
 'gen_ai.request.top_p': 0.9,
 'gen_ai.request.max_tokens': 150,
 'gen_ai.request.messages': expect.stringMatching(
 /\[\{"role":"system","content":"You are a friendly robot who likes to be funny."\},/,
 ), // Should include history when recordInputs: true
 'gen_ai.request.messages': '[{"role":"user","parts":[{"text":"Hello, how are you?"}]}]',
 }),
 description: 'chat gemini-1.5-pro create',
 op: 'gen_ai.chat',
Expand DownExpand Up@@ -504,6 +502,7 @@ describe('Google GenAI integration', () => {
 transaction: {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: Last message is large and gets truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'models',
Expand All@@ -521,6 +520,27 @@ describe('Google GenAI integration', () => {
 origin: 'auto.ai.google_genai',
 status: 'ok',
 }),
 // Second call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'models',
 'sentry.op': 'gen_ai.models',
 'sentry.origin': 'auto.ai.google_genai',
 'gen_ai.system': 'google_genai',
 'gen_ai.request.model': 'gemini-1.5-flash',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 {
 role: 'user',
 parts: [{ text: 'This is a small message that fits within the limit' }],
 },
 ]),
 }),
 description: 'models gemini-1.5-flash',
 op: 'gen_ai.models',
 origin: 'auto.ai.google_genai',
 status: 'ok',
 }),
 ]),
 },
 })
Expand Down

18 changes: 14 additions & 4 deletions
dev-packages/node-integration-tests/suites/tracing/langchain/scenario-message-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -51,17 +51,27 @@ async function run() {

 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 // Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3 + largeContent2);
 // Test 1: Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3);

 // Create an array of messages that gets truncated to only include the last message (result should again contain only Cs)
 // Test 2: Create an array of messages that gets truncated to only include the last message
 // The last message should be truncated to fit within the 20KB limit (result should again contain only Cs)
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: largeContent3 },
 ]);

 // Test 3: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: smallContent },
 ]);
 });

 await Sentry.flush(2000);
Expand Down

20 changes: 20 additions & 0 deletions
dev-packages/node-integration-tests/suites/tracing/langchain/test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -198,6 +198,7 @@ describe('LangChain integration', () => {
 const EXPECTED_TRANSACTION_MESSAGE_TRUNCATION = {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: String input truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -213,6 +214,7 @@ describe('LangChain integration', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Second call: Array input, last message truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -228,6 +230,24 @@ describe('LangChain integration', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Third call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
 'sentry.op': 'gen_ai.chat',
 'sentry.origin': 'auto.ai.langchain',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-5-sonnet-20241022',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 { role: 'user', content: 'This is a small message that fits within the limit' },
 ]),
 }),
 description: 'chat claude-3-5-sonnet-20241022',
 op: 'gen_ai.chat',
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 ]),
 };

Expand Down

18 changes: 14 additions & 4 deletions
...ckages/node-integration-tests/suites/tracing/langchain/v1/scenario-message-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -51,17 +51,27 @@ async function run() {

 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 // Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3 + largeContent2);
 // Test 1: Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3);

 // Create an array of messages that gets truncated to only include the last message (result should again contain only Cs)
 // Test 2: Create an array of messages that gets truncated to only include the last message
 // The last message should be truncated to fit within the 20KB limit (result should again contain only Cs)
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: largeContent3 },
 ]);

 // Test 3: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: smallContent },
 ]);
 });

 await Sentry.flush(2000);
Expand Down

20 changes: 20 additions & 0 deletions
dev-packages/node-integration-tests/suites/tracing/langchain/v1/test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -241,6 +241,7 @@ conditionalTest({ min: 20 })('LangChain integration (v1)', () => {
 const EXPECTED_TRANSACTION_MESSAGE_TRUNCATION = {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: String input truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -256,6 +257,7 @@ conditionalTest({ min: 20 })('LangChain integration (v1)', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Second call: Array input, last message truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -271,6 +273,24 @@ conditionalTest({ min: 20 })('LangChain integration (v1)', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Third call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
 'sentry.op': 'gen_ai.chat',
 'sentry.origin': 'auto.ai.langchain',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-5-sonnet-20241022',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 { role: 'user', content: 'This is a small message that fits within the limit' },
 ]),
 }),
 description: 'chat claude-3-5-sonnet-20241022',
 op: 'gen_ai.chat',
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 ]),
 };

Expand Down

6 changes: 6 additions & 0 deletions
dev-packages/node-integration-tests/suites/tracing/openai/scenario-embeddings.mjs

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -67,6 +67,12 @@ async function run() {
 } catch {
 // Error is expected and handled
 }

 // Third test: embeddings API with multiple inputs
 await client.embeddings.create({
 input: ['First input text', 'Second input text', 'Third input text'],
 model: 'text-embedding-3-small',
 });
 });

 server.close();
Expand Down
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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nicohrubec
merged 10 commits into

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Jan 21, 2026
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feat(core): simplify truncation logic to only keep the newest message
#18906
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ff334af

feat(core): simplify truncation logic to only keep the newest message


nicohrubec Jan 20, 2026
620d956

more tests


nicohrubec Jan 20, 2026
aaca8da

update test expectations


nicohrubec Jan 20, 2026
4ced95e

yarn fix


nicohrubec Jan 20, 2026
1c45147

revert changes


nicohrubec Jan 20, 2026
30ef964

.


nicohrubec Jan 20, 2026
e5d809d

clean up comments


nicohrubec Jan 21, 2026
52b0e2e

fix embeddings truncation


nicohrubec Jan 21, 2026
e36f8d3

set embeddings as separate attribute and do not truncate


nicohrubec Jan 21, 2026
15215d4

early returns to make it a bit easier to understand


nicohrubec Jan 21, 2026

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9 changes: 5 additions & 4 deletions
dev-packages/node-integration-tests/suites/tracing/anthropic/scenario-media-truncation.mjs

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -49,10 +49,15 @@ async function run() {
 const client = instrumentAnthropicAiClient(mockClient);

 // Send the image showing the number 3
 // Put the image in the last message so it doesn't get dropped
 await client.messages.create({
 model: 'claude-3-haiku-20240307',
 max_tokens: 1024,
 messages: [
 {
 role: 'user',
 content: 'what number is this?',
 },
 {
 role: 'user',
 content: [
Expand All@@ -66,10 +71,6 @@ async function run() {
 },
 ],
 },
 {
 role: 'user',
 content: 'what number is this?',
 },
 ],
 temperature: 0.7,
 });
Expand Down

21 changes: 17 additions & 4 deletions
dev-packages/node-integration-tests/suites/tracing/anthropic/scenario-message-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -48,12 +48,11 @@ async function run() {

 const client = instrumentAnthropicAiClient(mockClient);

 // Create 3 large messages where:
 // - First 2 messages are very large (will be dropped)
 // - Last message is large but will be truncated to fit within the 20KB limit
 // Test 1: Given an array of messages only the last message should be kept
 // The last message should be truncated to fit within the 20KB limit
 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 await client.messages.create({
 model: 'claude-3-haiku-20240307',
Expand All@@ -65,6 +64,20 @@ async function run() {
 ],
 temperature: 0.7,
 });

 // Test 2: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await client.messages.create({
 model: 'claude-3-haiku-20240307',
 max_tokens: 100,
 messages: [
 { role: 'user', content: largeContent1 },
 { role: 'assistant', content: largeContent2 },
 { role: 'user', content: smallContent },
 ],
 temperature: 0.7,
 });
 });
}

Expand Down

27 changes: 21 additions & 6 deletions
dev-packages/node-integration-tests/suites/tracing/anthropic/test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -86,8 +86,7 @@ describe('Anthropic integration', () => {
 data: expect.objectContaining({
 'gen_ai.operation.name': 'messages',
 'gen_ai.request.max_tokens': 100,
 'gen_ai.request.messages':
 '[{"role":"system","content":"You are a helpful assistant."},{"role":"user","content":"What is the capital of France?"}]',
 'gen_ai.request.messages': '[{"role":"user","content":"What is the capital of France?"}]',
 'gen_ai.request.model': 'claude-3-haiku-20240307',
 'gen_ai.request.temperature': 0.7,
 'gen_ai.response.id': 'msg_mock123',
Expand DownExpand Up@@ -638,6 +637,7 @@ describe('Anthropic integration', () => {
 transaction: {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: Last message is large and gets truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'messages',
Expand All@@ -653,6 +653,24 @@ describe('Anthropic integration', () => {
 origin: 'auto.ai.anthropic',
 status: 'ok',
 }),
 // Second call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'messages',
 'sentry.op': 'gen_ai.messages',
 'sentry.origin': 'auto.ai.anthropic',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-haiku-20240307',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 { role: 'user', content: 'This is a small message that fits within the limit' },
 ]),
 }),
 description: 'messages claude-3-haiku-20240307',
 op: 'gen_ai.messages',
 origin: 'auto.ai.anthropic',
 status: 'ok',
 }),
 ]),
 },
 })
Expand All@@ -677,6 +695,7 @@ describe('Anthropic integration', () => {
 'sentry.origin': 'auto.ai.anthropic',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-haiku-20240307',
 // Only the last message (with filtered media) should be kept
 'gen_ai.request.messages': JSON.stringify([
 {
 role: 'user',
Expand All@@ -691,10 +710,6 @@ describe('Anthropic integration', () => {
 },
 ],
 },
 {
 role: 'user',
 content: 'what number is this?',
 },
 ]),
 }),
 description: 'messages claude-3-haiku-20240307',
Expand Down

24 changes: 20 additions & 4 deletions
...ckages/node-integration-tests/suites/tracing/google-genai/scenario-message-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -43,12 +43,11 @@ async function run() {

 const client = instrumentGoogleGenAIClient(mockClient);

 // Create 3 large messages where:
 // - First 2 messages are very large (will be dropped)
 // - Last message is large but will be truncated to fit within the 20KB limit
 // Test 1: Given an array of messages only the last message should be kept
 // The last message should be truncated to fit within the 20KB limit
 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 await client.models.generateContent({
 model: 'gemini-1.5-flash',
Expand All@@ -63,6 +62,23 @@ async function run() {
 { role: 'user', parts: [{ text: largeContent3 }] },
 ],
 });

 // Test 2: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await client.models.generateContent({
 model: 'gemini-1.5-flash',
 config: {
 temperature: 0.7,
 topP: 0.9,
 maxOutputTokens: 100,
 },
 contents: [
 { role: 'user', parts: [{ text: largeContent1 }] },
 { role: 'model', parts: [{ text: largeContent2 }] },
 { role: 'user', parts: [{ text: smallContent }] },
 ],
 });
 });
}

Expand Down

26 changes: 23 additions & 3 deletions
dev-packages/node-integration-tests/suites/tracing/google-genai/test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -94,9 +94,7 @@ describe('Google GenAI integration', () => {
 'gen_ai.request.temperature': 0.8,
 'gen_ai.request.top_p': 0.9,
 'gen_ai.request.max_tokens': 150,
 'gen_ai.request.messages': expect.stringMatching(
 /\[\{"role":"system","content":"You are a friendly robot who likes to be funny."\},/,
 ), // Should include history when recordInputs: true
 'gen_ai.request.messages': '[{"role":"user","parts":[{"text":"Hello, how are you?"}]}]',
 }),
 description: 'chat gemini-1.5-pro create',
 op: 'gen_ai.chat',
Expand DownExpand Up@@ -504,6 +502,7 @@ describe('Google GenAI integration', () => {
 transaction: {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: Last message is large and gets truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'models',
Expand All@@ -521,6 +520,27 @@ describe('Google GenAI integration', () => {
 origin: 'auto.ai.google_genai',
 status: 'ok',
 }),
 // Second call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'models',
 'sentry.op': 'gen_ai.models',
 'sentry.origin': 'auto.ai.google_genai',
 'gen_ai.system': 'google_genai',
 'gen_ai.request.model': 'gemini-1.5-flash',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 {
 role: 'user',
 parts: [{ text: 'This is a small message that fits within the limit' }],
 },
 ]),
 }),
 description: 'models gemini-1.5-flash',
 op: 'gen_ai.models',
 origin: 'auto.ai.google_genai',
 status: 'ok',
 }),
 ]),
 },
 })
Expand Down

18 changes: 14 additions & 4 deletions
dev-packages/node-integration-tests/suites/tracing/langchain/scenario-message-truncation.mjs

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -51,17 +51,27 @@ async function run() {

 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 // Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3 + largeContent2);
 // Test 1: Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3);

 // Create an array of messages that gets truncated to only include the last message (result should again contain only Cs)
 // Test 2: Create an array of messages that gets truncated to only include the last message
 // The last message should be truncated to fit within the 20KB limit (result should again contain only Cs)
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: largeContent3 },
 ]);

 // Test 3: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: smallContent },
 ]);
 });

 await Sentry.flush(2000);
Expand Down

20 changes: 20 additions & 0 deletions
dev-packages/node-integration-tests/suites/tracing/langchain/test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -198,6 +198,7 @@ describe('LangChain integration', () => {
 const EXPECTED_TRANSACTION_MESSAGE_TRUNCATION = {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: String input truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -213,6 +214,7 @@ describe('LangChain integration', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Second call: Array input, last message truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -228,6 +230,24 @@ describe('LangChain integration', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Third call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
 'sentry.op': 'gen_ai.chat',
 'sentry.origin': 'auto.ai.langchain',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-5-sonnet-20241022',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 { role: 'user', content: 'This is a small message that fits within the limit' },
 ]),
 }),
 description: 'chat claude-3-5-sonnet-20241022',
 op: 'gen_ai.chat',
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 ]),
 };

Expand Down

18 changes: 14 additions & 4 deletions
...ckages/node-integration-tests/suites/tracing/langchain/v1/scenario-message-truncation.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -51,17 +51,27 @@ async function run() {

 const largeContent1 = 'A'.repeat(15000); // ~15KB
 const largeContent2 = 'B'.repeat(15000); // ~15KB
 const largeContent3 = 'C'.repeat(25000); // ~25KB (will be truncated)
 const largeContent3 = 'C'.repeat(25000) + 'D'.repeat(25000); // ~50KB (will be truncated, only C's remain)

 // Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3 + largeContent2);
 // Test 1: Create one very large string that gets truncated to only include Cs
 await model.invoke(largeContent3);

 // Create an array of messages that gets truncated to only include the last message (result should again contain only Cs)
 // Test 2: Create an array of messages that gets truncated to only include the last message
 // The last message should be truncated to fit within the 20KB limit (result should again contain only Cs)
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: largeContent3 },
 ]);

 // Test 3: Given an array of messages only the last message should be kept
 // The last message is small, so it should be kept intact
 const smallContent = 'This is a small message that fits within the limit';
 await model.invoke([
 { role: 'system', content: largeContent1 },
 { role: 'user', content: largeContent2 },
 { role: 'user', content: smallContent },
 ]);
 });

 await Sentry.flush(2000);
Expand Down

20 changes: 20 additions & 0 deletions
dev-packages/node-integration-tests/suites/tracing/langchain/v1/test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -241,6 +241,7 @@ conditionalTest({ min: 20 })('LangChain integration (v1)', () => {
 const EXPECTED_TRANSACTION_MESSAGE_TRUNCATION = {
 transaction: 'main',
 spans: expect.arrayContaining([
 // First call: String input truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -256,6 +257,7 @@ conditionalTest({ min: 20 })('LangChain integration (v1)', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Second call: Array input, last message truncated (only C's remain, D's are cropped)
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
Expand All@@ -271,6 +273,24 @@ conditionalTest({ min: 20 })('LangChain integration (v1)', () => {
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 // Third call: Last message is small and kept without truncation
 expect.objectContaining({
 data: expect.objectContaining({
 'gen_ai.operation.name': 'chat',
 'sentry.op': 'gen_ai.chat',
 'sentry.origin': 'auto.ai.langchain',
 'gen_ai.system': 'anthropic',
 'gen_ai.request.model': 'claude-3-5-sonnet-20241022',
 // Small message should be kept intact
 'gen_ai.request.messages': JSON.stringify([
 { role: 'user', content: 'This is a small message that fits within the limit' },
 ]),
 }),
 description: 'chat claude-3-5-sonnet-20241022',
 op: 'gen_ai.chat',
 origin: 'auto.ai.langchain',
 status: 'ok',
 }),
 ]),
 };

Expand Down

6 changes: 6 additions & 0 deletions
dev-packages/node-integration-tests/suites/tracing/openai/scenario-embeddings.mjs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -67,6 +67,12 @@ async function run() {
 } catch {
 // Error is expected and handled
 }

 // Third test: embeddings API with multiple inputs
 await client.embeddings.create({
 input: ['First input text', 'Second input text', 'Third input text'],
 model: 'text-embedding-3-small',
 });
 });

 server.close();
Expand Down
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