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feat(claude_agent_sdk): Instrument hooks - #141

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Abhijeet Prasad (AbhiPrasad) merged 2 commits into
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Mar 25, 2026
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feat(claude_agent_sdk): Instrument hooks#141
Abhijeet Prasad (AbhiPrasad) merged 2 commits into
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abhi-claude-agent-sdk-hooks

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@AbhiPrasadAbhijeet Prasad (AbhiPrasad) commented Mar 25, 2026•
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resolves#67

Add support for instrumenting hooks for the claude agent sdk (https://platform.claude.com/docs/en/agent-sdk/hooks).

image

@AbhiPrasad
feat(claude_agent_sdk): Instrument hooks
45c5170
Instrument Claude Agent SDK hook callbacks through the Braintrust integration.
This changes the request-scoped tracing flow so hook callbacks running on the SDK control channel are captured alongside the existing Claude Agent task, LLM, and tool spans. The integration now starts request tracing at query time, wraps registered hook callbacks, records hook inputs and outputs as FUNCTION spans, and preserves correct parentage for tool lifecycle hooks and Stop hooks.
Users now get end-to-end visibility into Claude Agent SDK hooks, including UserPromptSubmit, PreToolUse, PostToolUse, and Stop callbacks. Hook spans attach to the matching tool span when possible, otherwise to the active LLM or task context, and UserPromptSubmit traces keep the original prompt attached to the request and LLM input.
Tests were updated with cassette-backed coverage for UserPromptSubmit hook tracing, tool hook tracing, hook parent/child relationships, and prompt attachment with UserPromptSubmit enabled. The Claude Agent SDK integration test suite passes against both the latest supported SDK and 0.1.10 replay environments.
@AbhiPrasad
Abhijeet Prasad (AbhiPrasad) marked this pull request as ready for review March 25, 2026 18:51
viadezo1er
Cedric / ViaDézo1er (viadezo1er) approved these changes Mar 25, 2026
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good to merge

@AbhiPrasad
Abhijeet Prasad (AbhiPrasad) merged commit 8b15ad6 into mainMar 25, 2026
34 checks passed
@AbhiPrasad
Abhijeet Prasad (AbhiPrasad) deleted the abhi-claude-agent-sdk-hooks branch March 25, 2026 20:05
@AbhiPrasadAbhijeet Prasad (AbhiPrasad) mentioned this pull request Mar 25, 2026
Merged
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Make the Claude Agent SDK support instrumenting hooks

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, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
 blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
feat(claude_agent_sdk): Instrument hooks by AbhiPrasad · Pull Request #141 · braintrustdata/braintrust-sdk-python · GitHub
Skip to content
feat(claude_agent_sdk): Instrument hooks - #141
Merged
Abhijeet Prasad (AbhiPrasad) merged 2 commits into
mainfrom 
abhi-claude-agent-sdk-hooks
Mar 25, 2026
Merged
feat(claude_agent_sdk): Instrument hooks#141
Abhijeet Prasad (AbhiPrasad) merged 2 commits into
mainfrom 
abhi-claude-agent-sdk-hooks
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@AbhiPrasadAbhijeet Prasad (AbhiPrasad)
commented
Mar 25, 2026•

edited

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resolves#67
Add support for instrumenting hooks for the claude agent sdk (https://platform.claude.com/docs/en/agent-sdk/hooks).
image
@AbhiPrasad
feat(claude_agent_sdk): Instrument hooks
45c5170
Instrument Claude Agent SDK hook callbacks through the Braintrust integration.
This changes the request-scoped tracing flow so hook callbacks running on the SDK control channel are captured alongside the existing Claude Agent task, LLM, and tool spans. The integration now starts request tracing at query time, wraps registered hook callbacks, records hook inputs and outputs as FUNCTION spans, and preserves correct parentage for tool lifecycle hooks and Stop hooks.
Users now get end-to-end visibility into Claude Agent SDK hooks, including UserPromptSubmit, PreToolUse, PostToolUse, and Stop callbacks. Hook spans attach to the matching tool span when possible, otherwise to the active LLM or task context, and UserPromptSubmit traces keep the original prompt attached to the request and LLM input.
Tests were updated with cassette-backed coverage for UserPromptSubmit hook tracing, tool hook tracing, hook parent/child relationships, and prompt attachment with UserPromptSubmit enabled. The Claude Agent SDK integration test suite passes against both the latest supported SDK and 0.1.10 replay environments.
@AbhiPrasad
Abhijeet Prasad (AbhiPrasad)
marked this pull request as ready for review
March 25, 2026 18:51
viadezo1er
Cedric / ViaDézo1er (viadezo1er)
approved these changes
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good to merge
@AbhiPrasad
Abhijeet Prasad (AbhiPrasad)
merged commit 8b15ad6
into
mainMar 25, 2026

34 checks passed

@AbhiPrasad
Abhijeet Prasad (AbhiPrasad)
deleted the

abhi-claude-agent-sdk-hooks

branch
March 25, 2026 20:05
@AbhiPrasadAbhijeet Prasad (AbhiPrasad)
mentioned this pull request
Mar 25, 2026
 Merged

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Make the Claude Agent SDK support instrumenting hooks


2 participants

@AbhiPrasad@viadezo1er

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
feat(claude_agent_sdk): Instrument hooks by AbhiPrasad · Pull Request #141 · braintrustdata/braintrust-sdk-python · GitHub
Skip to content
feat(claude_agent_sdk): Instrument hooks - #141
Merged
Abhijeet Prasad (AbhiPrasad) merged 2 commits into
mainfrom 
abhi-claude-agent-sdk-hooks
Mar 25, 2026
Merged
feat(claude_agent_sdk): Instrument hooks#141
Abhijeet Prasad (AbhiPrasad) merged 2 commits into
mainfrom 
abhi-claude-agent-sdk-hooks
Conversation
@AbhiPrasad
@AbhiPrasadAbhijeet Prasad (AbhiPrasad)
commented
Mar 25, 2026•

edited

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resolves#67
Add support for instrumenting hooks for the claude agent sdk (https://platform.claude.com/docs/en/agent-sdk/hooks).
image
@AbhiPrasad
feat(claude_agent_sdk): Instrument hooks
45c5170
Instrument Claude Agent SDK hook callbacks through the Braintrust integration.
This changes the request-scoped tracing flow so hook callbacks running on the SDK control channel are captured alongside the existing Claude Agent task, LLM, and tool spans. The integration now starts request tracing at query time, wraps registered hook callbacks, records hook inputs and outputs as FUNCTION spans, and preserves correct parentage for tool lifecycle hooks and Stop hooks.
Users now get end-to-end visibility into Claude Agent SDK hooks, including UserPromptSubmit, PreToolUse, PostToolUse, and Stop callbacks. Hook spans attach to the matching tool span when possible, otherwise to the active LLM or task context, and UserPromptSubmit traces keep the original prompt attached to the request and LLM input.
Tests were updated with cassette-backed coverage for UserPromptSubmit hook tracing, tool hook tracing, hook parent/child relationships, and prompt attachment with UserPromptSubmit enabled. The Claude Agent SDK integration test suite passes against both the latest supported SDK and 0.1.10 replay environments.
@AbhiPrasad
Abhijeet Prasad (AbhiPrasad)
marked this pull request as ready for review
March 25, 2026 18:51
viadezo1er
Cedric / ViaDézo1er (viadezo1er)
approved these changes
Mar 25, 2026
View reviewed changes
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good to merge
@AbhiPrasad
Abhijeet Prasad (AbhiPrasad)
merged commit 8b15ad6
into
mainMar 25, 2026

34 checks passed

@AbhiPrasad
Abhijeet Prasad (AbhiPrasad)
deleted the

abhi-claude-agent-sdk-hooks

branch
March 25, 2026 20:05
@AbhiPrasadAbhijeet Prasad (AbhiPrasad)
mentioned this pull request
Mar 25, 2026
 Merged

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@viadezo1erCedric / ViaDézo1er (viadezo1er)viadezo1er approved these changes
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Make the Claude Agent SDK support instrumenting hooks


2 participants

@AbhiPrasad@viadezo1er

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
feat(claude_agent_sdk): Instrument hooks by AbhiPrasad · Pull Request #141 · braintrustdata/braintrust-sdk-python · GitHub
Skip to content
feat(claude_agent_sdk): Instrument hooks - #141
Merged
Abhijeet Prasad (AbhiPrasad) merged 2 commits into
mainfrom 
abhi-claude-agent-sdk-hooks
Mar 25, 2026
Merged
feat(claude_agent_sdk): Instrument hooks#141
Abhijeet Prasad (AbhiPrasad) merged 2 commits into
mainfrom 
abhi-claude-agent-sdk-hooks
Conversation
@AbhiPrasad
@AbhiPrasadAbhijeet Prasad (AbhiPrasad)
commented
Mar 25, 2026•

edited

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resolves#67
Add support for instrumenting hooks for the claude agent sdk (https://platform.claude.com/docs/en/agent-sdk/hooks).
image
@AbhiPrasad
feat(claude_agent_sdk): Instrument hooks
45c5170
Instrument Claude Agent SDK hook callbacks through the Braintrust integration.
This changes the request-scoped tracing flow so hook callbacks running on the SDK control channel are captured alongside the existing Claude Agent task, LLM, and tool spans. The integration now starts request tracing at query time, wraps registered hook callbacks, records hook inputs and outputs as FUNCTION spans, and preserves correct parentage for tool lifecycle hooks and Stop hooks.
Users now get end-to-end visibility into Claude Agent SDK hooks, including UserPromptSubmit, PreToolUse, PostToolUse, and Stop callbacks. Hook spans attach to the matching tool span when possible, otherwise to the active LLM or task context, and UserPromptSubmit traces keep the original prompt attached to the request and LLM input.
Tests were updated with cassette-backed coverage for UserPromptSubmit hook tracing, tool hook tracing, hook parent/child relationships, and prompt attachment with UserPromptSubmit enabled. The Claude Agent SDK integration test suite passes against both the latest supported SDK and 0.1.10 replay environments.
@AbhiPrasad
Abhijeet Prasad (AbhiPrasad)
marked this pull request as ready for review
March 25, 2026 18:51
viadezo1er
Cedric / ViaDézo1er (viadezo1er)
approved these changes
Mar 25, 2026
View reviewed changes
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good to merge
@AbhiPrasad
Abhijeet Prasad (AbhiPrasad)
merged commit 8b15ad6
into
mainMar 25, 2026

34 checks passed

@AbhiPrasad
Abhijeet Prasad (AbhiPrasad)
deleted the

abhi-claude-agent-sdk-hooks

branch
March 25, 2026 20:05
@AbhiPrasadAbhijeet Prasad (AbhiPrasad)
mentioned this pull request
Mar 25, 2026
 Merged

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Make the Claude Agent SDK support instrumenting hooks


2 participants

@AbhiPrasad@viadezo1er

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
feat(claude_agent_sdk): Instrument hooks by AbhiPrasad · Pull Request #141 · braintrustdata/braintrust-sdk-python · GitHub
Skip to content
feat(claude_agent_sdk): Instrument hooks - #141
Merged
Abhijeet Prasad (AbhiPrasad) merged 2 commits into
mainfrom 
abhi-claude-agent-sdk-hooks
Mar 25, 2026
Merged
feat(claude_agent_sdk): Instrument hooks#141
Abhijeet Prasad (AbhiPrasad) merged 2 commits into
mainfrom 
abhi-claude-agent-sdk-hooks
Conversation
@AbhiPrasad
@AbhiPrasadAbhijeet Prasad (AbhiPrasad)
commented
Mar 25, 2026•

edited

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resolves#67
Add support for instrumenting hooks for the claude agent sdk (https://platform.claude.com/docs/en/agent-sdk/hooks).
image
@AbhiPrasad
feat(claude_agent_sdk): Instrument hooks
45c5170
Instrument Claude Agent SDK hook callbacks through the Braintrust integration.
This changes the request-scoped tracing flow so hook callbacks running on the SDK control channel are captured alongside the existing Claude Agent task, LLM, and tool spans. The integration now starts request tracing at query time, wraps registered hook callbacks, records hook inputs and outputs as FUNCTION spans, and preserves correct parentage for tool lifecycle hooks and Stop hooks.
Users now get end-to-end visibility into Claude Agent SDK hooks, including UserPromptSubmit, PreToolUse, PostToolUse, and Stop callbacks. Hook spans attach to the matching tool span when possible, otherwise to the active LLM or task context, and UserPromptSubmit traces keep the original prompt attached to the request and LLM input.
Tests were updated with cassette-backed coverage for UserPromptSubmit hook tracing, tool hook tracing, hook parent/child relationships, and prompt attachment with UserPromptSubmit enabled. The Claude Agent SDK integration test suite passes against both the latest supported SDK and 0.1.10 replay environments.
@AbhiPrasad
Abhijeet Prasad (AbhiPrasad)
marked this pull request as ready for review
March 25, 2026 18:51
viadezo1er
Cedric / ViaDézo1er (viadezo1er)
approved these changes
Mar 25, 2026
View reviewed changes
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good to merge
@AbhiPrasad
Abhijeet Prasad (AbhiPrasad)
merged commit 8b15ad6
into
mainMar 25, 2026

34 checks passed

@AbhiPrasad
Abhijeet Prasad (AbhiPrasad)
deleted the

abhi-claude-agent-sdk-hooks

branch
March 25, 2026 20:05
@AbhiPrasadAbhijeet Prasad (AbhiPrasad)
mentioned this pull request
Mar 25, 2026
 Merged

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Make the Claude Agent SDK support instrumenting hooks


2 participants

@AbhiPrasad@viadezo1er

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
feat(claude_agent_sdk): Instrument hooks by AbhiPrasad · Pull Request #141 · braintrustdata/braintrust-sdk-python · GitHub
Skip to content
feat(claude_agent_sdk): Instrument hooks - #141
Merged
Abhijeet Prasad (AbhiPrasad) merged 2 commits into
mainfrom 
abhi-claude-agent-sdk-hooks
Mar 25, 2026
Merged
feat(claude_agent_sdk): Instrument hooks#141
Abhijeet Prasad (AbhiPrasad) merged 2 commits into
mainfrom 
abhi-claude-agent-sdk-hooks
Conversation
@AbhiPrasad
@AbhiPrasadAbhijeet Prasad (AbhiPrasad)
commented
Mar 25, 2026•

edited

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resolves#67
Add support for instrumenting hooks for the claude agent sdk (https://platform.claude.com/docs/en/agent-sdk/hooks).
image
@AbhiPrasad
feat(claude_agent_sdk): Instrument hooks
45c5170
Instrument Claude Agent SDK hook callbacks through the Braintrust integration.
This changes the request-scoped tracing flow so hook callbacks running on the SDK control channel are captured alongside the existing Claude Agent task, LLM, and tool spans. The integration now starts request tracing at query time, wraps registered hook callbacks, records hook inputs and outputs as FUNCTION spans, and preserves correct parentage for tool lifecycle hooks and Stop hooks.
Users now get end-to-end visibility into Claude Agent SDK hooks, including UserPromptSubmit, PreToolUse, PostToolUse, and Stop callbacks. Hook spans attach to the matching tool span when possible, otherwise to the active LLM or task context, and UserPromptSubmit traces keep the original prompt attached to the request and LLM input.
Tests were updated with cassette-backed coverage for UserPromptSubmit hook tracing, tool hook tracing, hook parent/child relationships, and prompt attachment with UserPromptSubmit enabled. The Claude Agent SDK integration test suite passes against both the latest supported SDK and 0.1.10 replay environments.
@AbhiPrasad
Abhijeet Prasad (AbhiPrasad)
marked this pull request as ready for review
March 25, 2026 18:51
viadezo1er
Cedric / ViaDézo1er (viadezo1er)
approved these changes
Mar 25, 2026
View reviewed changes
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good to merge
@AbhiPrasad
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Make the Claude Agent SDK support instrumenting hooks


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, 'i');
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document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
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unstick();
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observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
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} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
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try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
feat(claude_agent_sdk): Instrument hooks by AbhiPrasad · Pull Request #141 · braintrustdata/braintrust-sdk-python · GitHub
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feat(claude_agent_sdk): Instrument hooks - #141
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Abhijeet Prasad (AbhiPrasad) merged 2 commits into
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abhi-claude-agent-sdk-hooks
Mar 25, 2026
Merged
feat(claude_agent_sdk): Instrument hooks#141
Abhijeet Prasad (AbhiPrasad) merged 2 commits into
mainfrom 
abhi-claude-agent-sdk-hooks
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@AbhiPrasadAbhijeet Prasad (AbhiPrasad)
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resolves#67
Add support for instrumenting hooks for the claude agent sdk (https://platform.claude.com/docs/en/agent-sdk/hooks).
image
@AbhiPrasad
feat(claude_agent_sdk): Instrument hooks
45c5170
Instrument Claude Agent SDK hook callbacks through the Braintrust integration.
This changes the request-scoped tracing flow so hook callbacks running on the SDK control channel are captured alongside the existing Claude Agent task, LLM, and tool spans. The integration now starts request tracing at query time, wraps registered hook callbacks, records hook inputs and outputs as FUNCTION spans, and preserves correct parentage for tool lifecycle hooks and Stop hooks.
Users now get end-to-end visibility into Claude Agent SDK hooks, including UserPromptSubmit, PreToolUse, PostToolUse, and Stop callbacks. Hook spans attach to the matching tool span when possible, otherwise to the active LLM or task context, and UserPromptSubmit traces keep the original prompt attached to the request and LLM input.
Tests were updated with cassette-backed coverage for UserPromptSubmit hook tracing, tool hook tracing, hook parent/child relationships, and prompt attachment with UserPromptSubmit enabled. The Claude Agent SDK integration test suite passes against both the latest supported SDK and 0.1.10 replay environments.
@AbhiPrasad
Abhijeet Prasad (AbhiPrasad)
marked this pull request as ready for review
March 25, 2026 18:51
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Cedric / ViaDézo1er (viadezo1er)
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good to merge
@AbhiPrasad
Abhijeet Prasad (AbhiPrasad)
merged commit 8b15ad6
into
mainMar 25, 2026

34 checks passed

@AbhiPrasad
Abhijeet Prasad (AbhiPrasad)
deleted the

abhi-claude-agent-sdk-hooks

branch
March 25, 2026 20:05
@AbhiPrasadAbhijeet Prasad (AbhiPrasad)
mentioned this pull request
Mar 25, 2026
 Merged

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Make the Claude Agent SDK support instrumenting hooks


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@AbhiPrasad@viadezo1er

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
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[data-theme="light"], [data-theme="light"],
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.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
feat(claude_agent_sdk): Instrument hooks by AbhiPrasad · Pull Request #141 · braintrustdata/braintrust-sdk-python · GitHub
Skip to content
feat(claude_agent_sdk): Instrument hooks - #141
Merged
Abhijeet Prasad (AbhiPrasad) merged 2 commits into
mainfrom 
abhi-claude-agent-sdk-hooks
Mar 25, 2026
Merged
feat(claude_agent_sdk): Instrument hooks#141
Abhijeet Prasad (AbhiPrasad) merged 2 commits into
mainfrom 
abhi-claude-agent-sdk-hooks
Conversation
@AbhiPrasad
@AbhiPrasadAbhijeet Prasad (AbhiPrasad)
commented
Mar 25, 2026•

edited

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resolves#67
Add support for instrumenting hooks for the claude agent sdk (https://platform.claude.com/docs/en/agent-sdk/hooks).
image
@AbhiPrasad
feat(claude_agent_sdk): Instrument hooks
45c5170
Instrument Claude Agent SDK hook callbacks through the Braintrust integration.
This changes the request-scoped tracing flow so hook callbacks running on the SDK control channel are captured alongside the existing Claude Agent task, LLM, and tool spans. The integration now starts request tracing at query time, wraps registered hook callbacks, records hook inputs and outputs as FUNCTION spans, and preserves correct parentage for tool lifecycle hooks and Stop hooks.
Users now get end-to-end visibility into Claude Agent SDK hooks, including UserPromptSubmit, PreToolUse, PostToolUse, and Stop callbacks. Hook spans attach to the matching tool span when possible, otherwise to the active LLM or task context, and UserPromptSubmit traces keep the original prompt attached to the request and LLM input.
Tests were updated with cassette-backed coverage for UserPromptSubmit hook tracing, tool hook tracing, hook parent/child relationships, and prompt attachment with UserPromptSubmit enabled. The Claude Agent SDK integration test suite passes against both the latest supported SDK and 0.1.10 replay environments.
@AbhiPrasad
Abhijeet Prasad (AbhiPrasad)
marked this pull request as ready for review
March 25, 2026 18:51
viadezo1er
Cedric / ViaDézo1er (viadezo1er)
approved these changes
Mar 25, 2026
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good to merge
@AbhiPrasad
Abhijeet Prasad (AbhiPrasad)
merged commit 8b15ad6
into
mainMar 25, 2026

34 checks passed

@AbhiPrasad
Abhijeet Prasad (AbhiPrasad)
deleted the

abhi-claude-agent-sdk-hooks

branch
March 25, 2026 20:05
@AbhiPrasadAbhijeet Prasad (AbhiPrasad)
mentioned this pull request
Mar 25, 2026
 Merged

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@viadezo1erCedric / ViaDézo1er (viadezo1er)viadezo1er approved these changes
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Make the Claude Agent SDK support instrumenting hooks


2 participants

@AbhiPrasad@viadezo1er