feat(dev): agent-proxy routes for the Agent Inspector#2085

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tejaskash merged 5 commits into from
Aug 26, 2026
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feat(dev): agent-proxy routes for the Agent Inspector #2085

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a068c2d
feat(dev): agent-proxy routes for the Agent Inspector
tejaskash Aug 24, 2026
41322f4
refactor(inspector): simplify agent-proxy routes
tejaskash Aug 24, 2026
d720c70
refactor(inspector): drop comments that restate the code
tejaskash Aug 26, 2026
0c0f90f
refactor(inspector): simplify A2A text extraction and invocation disp…
tejaskash Aug 26, 2026
279c0da
test(inspector): cover resource mapping and proxy error paths
tejaskash Aug 26, 2026
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254 changes: 254 additions & 0 deletions src/core/dev/inspector/invocations.test.ts
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@@ -0,0 +1,254 @@
import { afterEach, describe, expect, test } from "bun:test";
import { type HttpRequestHandler, startHttpServer } from "../../../io/httpServer";
import { parseAgentEvent } from "./invocations";
import { ServerFarm, fakeSupervisor, post, runningAgent } from "./testkit";
import type { InspectorDeps } from "./types";

const farm = new ServerFarm();
afterEach(() => farm.close());

function sseAgent(frames: string[]): HttpRequestHandler {
return () => ({
status: 200,
headers: { "Content-Type": "text/event-stream" },
body: frames.map((frame) => `data: ${frame}\n\n`).join(""),
});
}

async function inspectorFor(handler: HttpRequestHandler, protocol = "HTTP") {
const agent = await farm.serve(handler);
const supervisor = fakeSupervisor({ agents: [runningAgent("orders", agent.port, protocol)] });
return farm.inspector({ supervisor } satisfies InspectorDeps);
}

describe("POST /invocations routing", () => {
test("returns 409 when no agent is running", async () => {
const { url } = await farm.inspector({ supervisor: fakeSupervisor() });
const response = await post(url, "/invocations", { prompt: "hi" });
expect(response.status).toBe(409);
expect(await response.json()).toMatchObject({ success: false });
});

test("directs MCP agents to the dedicated proxy instead of mis-proxying them", async () => {
const { url } = await inspectorFor(sseAgent([]), "MCP");
const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
expect(response.status).toBe(400);
expect(await response.json()).toEqual({
success: false,
error: "MCP agents are invoked through POST /api/mcp, not /invocations.",
});
});
});

describe("upstream connection failures", () => {
async function deadPort(): Promise<number> {
const handle = await startHttpServer(() => ({ status: 200 }));
await handle.close();
return handle.port;
}

test.each([
{ protocol: "HTTP", errorPrefix: "Agent server error" },
{ protocol: "A2A", errorPrefix: "A2A agent error" },
])("returns 502 when a $protocol agent is unreachable", async ({ protocol, errorPrefix }) => {
const supervisor = fakeSupervisor({
agents: [runningAgent("orders", await deadPort(), protocol)],
});
const { url } = await farm.inspector({ supervisor });
const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
expect(response.status).toBe(502);
const body = (await response.json()) as { success: boolean; error: string };
expect(body.success).toBe(false);
expect(body.error).toContain(errorPrefix);
});
});

describe("parseAgentEvent drops non-renderable frames", () => {
test.each([
{ name: "a JSON primitive that is not text", data: JSON.stringify(42) },
{ name: "a blank error field", data: JSON.stringify({ error: "" }) },
{ name: "a blank text field", data: JSON.stringify({ text: "" }) },
{ name: "an empty non-JSON token", data: "" },
])("returns null for $name", ({ data }) => {
expect(parseAgentEvent(data)).toBeNull();
});
});

describe("HTTP agent SSE normalization", () => {
test.each([
{ name: "a bedrock text event", frame: JSON.stringify({ text: "hello" }), expected: "hello" },
{ name: "a bare JSON string token", frame: JSON.stringify("world"), expected: "world" },
{
name: "a ConverseStream content delta",
frame: JSON.stringify({ event: { contentBlockDelta: { delta: { text: "delta" } } } }),
expected: "delta",
},
{ name: "a non-JSON plain-text token", frame: "raw-token", expected: "raw-token" },
])("normalizes $name to a data frame", async ({ frame, expected }) => {
const { url } = await inspectorFor(sseAgent([frame]));
const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
expect(response.headers.get("content-type")).toContain("text/event-stream");
expect(await response.text()).toBe(`data: ${JSON.stringify(expected)}\n\n`);
});

test("re-frames an agent error event as an error payload", async () => {
const { url } = await inspectorFor(sseAgent([JSON.stringify({ error: "boom" })]));
const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
expect(await response.text()).toBe(`data: ${JSON.stringify({ error: "boom" })}\n\n`);
});

test("passes a non-SSE response body through untouched", async () => {

@HweinstockHweinstockAug 26, 2026

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i like how readable these tests are.

const { url } = await inspectorFor(() => ({
status: 200,
headers: { "Content-Type": "application/json" },
body: JSON.stringify({ answer: 42 }),
}));
const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
expect(response.headers.get("content-type")).toContain("application/json");
expect(await response.json()).toEqual({ answer: 42 });
});

test("echoes one session id and forwards it to the agent", async () => {
let received: string | undefined;
const { url } = await inspectorFor((request) => {
received = request.headers["x-amzn-bedrock-agentcore-runtime-session-id"] as string;
return { status: 200, headers: { "Content-Type": "text/event-stream" }, body: "" };
});
const response = await post(url, "/invocations", {
agentName: "orders",
prompt: "hi",
sessionId: "session-42",
});
expect(response.headers.get("x-session-id")).toBe("session-42");
expect(received).toBe("session-42");
});
});

describe("A2A agent invocation", () => {
test("translates the prompt to message/stream and reduces events to text frames", async () => {
let rpcMethod: string | undefined;
const { url } = await inspectorFor((request) => {
rpcMethod = (JSON.parse(request.body.toString()) as { method: string }).method;
const status = JSON.stringify({
result: {
kind: "status-update",
status: { message: { parts: [{ kind: "text", text: "streamed" }] } },
},
});
return {
status: 200,
headers: { "Content-Type": "text/event-stream" },
body: `data: ${status}\n\n`,
};
}, "A2A");
const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
expect(rpcMethod).toBe("message/stream");
expect(await response.text()).toBe(`data: ${JSON.stringify("streamed")}\n\n`);
});

test("skips artifact text already streamed by a preceding status-update", async () => {
const status = JSON.stringify({
result: {
kind: "status-update",
status: { message: { parts: [{ kind: "text", text: "answer" }] } },
},
});
const artifact = JSON.stringify({
result: { kind: "artifact-update", artifact: { parts: [{ kind: "text", text: "answer" }] } },
});
const { url } = await inspectorFor(sseAgent([status, artifact]), "A2A");
const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
expect(await response.text()).toBe(`data: ${JSON.stringify("answer")}\n\n`);
});

test("falls back to extracting text from a non-streaming JSON-RPC result", async () => {
const { url } = await inspectorFor(
() => ({
status: 200,
headers: { "Content-Type": "application/json" },
body: JSON.stringify({
result: { artifacts: [{ parts: [{ kind: "text", text: "final" }] }] },
}),
}),
"A2A",
);
const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
expect(response.headers.get("content-type")).toContain("text/event-stream");
expect(await response.text()).toBe(`data: ${JSON.stringify("final")}\n\n`);
});

test.each([
{
name: "an artifact-update with no preceding status-update",
frame: JSON.stringify({
result: { kind: "artifact-update", artifact: { parts: [{ kind: "text", text: "art" }] } },
}),
expected: "art",
},
{ name: "a frame that is not JSON", frame: "not-json", expected: "not-json" },
{
name: "a task event carrying a status message",
frame: JSON.stringify({
result: {
kind: "task",
status: { message: { parts: [{ kind: "text", text: "task-text" }] } },
},
}),
expected: "task-text",
},
])("streams text extracted from $name", async ({ frame, expected }) => {
const { url } = await inspectorFor(sseAgent([frame]), "A2A");
const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
expect(await response.text()).toBe(`data: ${JSON.stringify(expected)}\n\n`);
});

test("drops a task frame that carries no renderable parts", async () => {
const { url } = await inspectorFor(
sseAgent([JSON.stringify({ result: { kind: "task" } })]),
"A2A",
);
const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
expect(await response.text()).toBe("");
});

test("passes a non-JSON A2A response through as plain text", async () => {
const { url } = await inspectorFor(
() => ({ status: 200, headers: { "Content-Type": "text/plain" }, body: "not json" }),
"A2A",
);
const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
expect(response.headers.get("content-type")).toContain("text/plain");
expect(await response.text()).toBe("not json");
});

test("requires a prompt", async () => {
const { url } = await inspectorFor(sseAgent([]), "A2A");
const response = await post(url, "/invocations", { agentName: "orders" });
expect(response.status).toBe(400);
expect(await response.json()).toEqual({ success: false, error: "prompt is required" });
});
});

describe("AGUI agent invocation", () => {
test("sends a RunAgentInput body and passes the response through", async () => {
let body: Record<string, unknown> | undefined;
const { url } = await inspectorFor((request) => {
body = JSON.parse(request.body.toString()) as Record<string, unknown>;
return {
status: 200,
headers: { "Content-Type": "text/event-stream" },
body: "data: passthrough\n\n",
};
}, "AGUI");
const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
expect(body).toMatchObject({ messages: [{ role: "user", content: "hi" }] });
expect(await response.text()).toBe("data: passthrough\n\n");
});

test("requires a prompt", async () => {
const { url } = await inspectorFor(sseAgent([]), "AGUI");
const response = await post(url, "/invocations", { agentName: "orders" });
expect(response.status).toBe(400);
expect(await response.json()).toEqual({ success: false, error: "prompt is required" });
});
});
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n 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;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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feat(dev): agent-proxy routes for the Agent Inspector#2085

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privacy statement. We’ll occasionally send you account related emails.

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to your account

 Merged

tejaskash
merged 5 commits into

from

Aug 26, 2026
 Merged


feat(dev): agent-proxy routes for the Agent Inspector
#2085
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Hold shift + click to select a range
a068c2d

feat(dev): agent-proxy routes for the Agent Inspector


tejaskash Aug 24, 2026
41322f4

refactor(inspector): simplify agent-proxy routes


tejaskash Aug 24, 2026
d720c70

refactor(inspector): drop comments that restate the code


tejaskash Aug 26, 2026
0c0f90f

refactor(inspector): simplify A2A text extraction and invocation disp…


tejaskash Aug 26, 2026
279c0da

test(inspector): cover resource mapping and proxy error paths


tejaskash Aug 26, 2026

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254 changes: 254 additions & 0 deletions
src/core/dev/inspector/invocations.test.ts

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Open in desktop

Original file line numberDiff line numberDiff line change
@@ -0,0 +1,254 @@
import { afterEach, describe, expect, test } from "bun:test";
import { type HttpRequestHandler, startHttpServer } from "../../../io/httpServer";
import { parseAgentEvent } from "./invocations";
import { ServerFarm, fakeSupervisor, post, runningAgent } from "./testkit";
import type { InspectorDeps } from "./types";

const farm = new ServerFarm();
afterEach(() => farm.close());

function sseAgent(frames: string[]): HttpRequestHandler {
 return () => ({
 status: 200,
 headers: { "Content-Type": "text/event-stream" },
 body: frames.map((frame) => `data: ${frame}\n\n`).join(""),
 });
}

async function inspectorFor(handler: HttpRequestHandler, protocol = "HTTP") {
 const agent = await farm.serve(handler);
 const supervisor = fakeSupervisor({ agents: [runningAgent("orders", agent.port, protocol)] });
 return farm.inspector({ supervisor } satisfies InspectorDeps);
}

describe("POST /invocations routing", () => {
 test("returns 409 when no agent is running", async () => {
 const { url } = await farm.inspector({ supervisor: fakeSupervisor() });
 const response = await post(url, "/invocations", { prompt: "hi" });
 expect(response.status).toBe(409);
 expect(await response.json()).toMatchObject({ success: false });
 });

 test("directs MCP agents to the dedicated proxy instead of mis-proxying them", async () => {
 const { url } = await inspectorFor(sseAgent([]), "MCP");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.status).toBe(400);
 expect(await response.json()).toEqual({
 success: false,
 error: "MCP agents are invoked through POST /api/mcp, not /invocations.",
 });
 });
});

describe("upstream connection failures", () => {
 async function deadPort(): Promise<number> {
 const handle = await startHttpServer(() => ({ status: 200 }));
 await handle.close();
 return handle.port;
 }

 test.each([
 { protocol: "HTTP", errorPrefix: "Agent server error" },
 { protocol: "A2A", errorPrefix: "A2A agent error" },
 ])("returns 502 when a $protocol agent is unreachable", async ({ protocol, errorPrefix }) => {
 const supervisor = fakeSupervisor({
 agents: [runningAgent("orders", await deadPort(), protocol)],
 });
 const { url } = await farm.inspector({ supervisor });
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.status).toBe(502);
 const body = (await response.json()) as { success: boolean; error: string };
 expect(body.success).toBe(false);
 expect(body.error).toContain(errorPrefix);
 });
});

describe("parseAgentEvent drops non-renderable frames", () => {
 test.each([
 { name: "a JSON primitive that is not text", data: JSON.stringify(42) },
 { name: "a blank error field", data: JSON.stringify({ error: "" }) },
 { name: "a blank text field", data: JSON.stringify({ text: "" }) },
 { name: "an empty non-JSON token", data: "" },
 ])("returns null for $name", ({ data }) => {
 expect(parseAgentEvent(data)).toBeNull();
 });
});

describe("HTTP agent SSE normalization", () => {
 test.each([
 { name: "a bedrock text event", frame: JSON.stringify({ text: "hello" }), expected: "hello" },
 { name: "a bare JSON string token", frame: JSON.stringify("world"), expected: "world" },
 {
 name: "a ConverseStream content delta",
 frame: JSON.stringify({ event: { contentBlockDelta: { delta: { text: "delta" } } } }),
 expected: "delta",
 },
 { name: "a non-JSON plain-text token", frame: "raw-token", expected: "raw-token" },
 ])("normalizes $name to a data frame", async ({ frame, expected }) => {
 const { url } = await inspectorFor(sseAgent([frame]));
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("text/event-stream");
 expect(await response.text()).toBe(`data: ${JSON.stringify(expected)}\n\n`);
 });

 test("re-frames an agent error event as an error payload", async () => {
 const { url } = await inspectorFor(sseAgent([JSON.stringify({ error: "boom" })]));
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe(`data: ${JSON.stringify({ error: "boom" })}\n\n`);
 });

 test("passes a non-SSE response body through untouched", async () => {
@HweinstockHweinstockAug 26, 2026

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i like how readable these tests are.
 const { url } = await inspectorFor(() => ({
 status: 200,
 headers: { "Content-Type": "application/json" },
 body: JSON.stringify({ answer: 42 }),
 }));
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("application/json");
 expect(await response.json()).toEqual({ answer: 42 });
 });

 test("echoes one session id and forwards it to the agent", async () => {
 let received: string | undefined;
 const { url } = await inspectorFor((request) => {
 received = request.headers["x-amzn-bedrock-agentcore-runtime-session-id"] as string;
 return { status: 200, headers: { "Content-Type": "text/event-stream" }, body: "" };
 });
 const response = await post(url, "/invocations", {
 agentName: "orders",
 prompt: "hi",
 sessionId: "session-42",
 });
 expect(response.headers.get("x-session-id")).toBe("session-42");
 expect(received).toBe("session-42");
 });
});

describe("A2A agent invocation", () => {
 test("translates the prompt to message/stream and reduces events to text frames", async () => {
 let rpcMethod: string | undefined;
 const { url } = await inspectorFor((request) => {
 rpcMethod = (JSON.parse(request.body.toString()) as { method: string }).method;
 const status = JSON.stringify({
 result: {
 kind: "status-update",
 status: { message: { parts: [{ kind: "text", text: "streamed" }] } },
 },
 });
 return {
 status: 200,
 headers: { "Content-Type": "text/event-stream" },
 body: `data: ${status}\n\n`,
 };
 }, "A2A");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(rpcMethod).toBe("message/stream");
 expect(await response.text()).toBe(`data: ${JSON.stringify("streamed")}\n\n`);
 });

 test("skips artifact text already streamed by a preceding status-update", async () => {
 const status = JSON.stringify({
 result: {
 kind: "status-update",
 status: { message: { parts: [{ kind: "text", text: "answer" }] } },
 },
 });
 const artifact = JSON.stringify({
 result: { kind: "artifact-update", artifact: { parts: [{ kind: "text", text: "answer" }] } },
 });
 const { url } = await inspectorFor(sseAgent([status, artifact]), "A2A");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe(`data: ${JSON.stringify("answer")}\n\n`);
 });

 test("falls back to extracting text from a non-streaming JSON-RPC result", async () => {
 const { url } = await inspectorFor(
 () => ({
 status: 200,
 headers: { "Content-Type": "application/json" },
 body: JSON.stringify({
 result: { artifacts: [{ parts: [{ kind: "text", text: "final" }] }] },
 }),
 }),
 "A2A",
 );
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("text/event-stream");
 expect(await response.text()).toBe(`data: ${JSON.stringify("final")}\n\n`);
 });

 test.each([
 {
 name: "an artifact-update with no preceding status-update",
 frame: JSON.stringify({
 result: { kind: "artifact-update", artifact: { parts: [{ kind: "text", text: "art" }] } },
 }),
 expected: "art",
 },
 { name: "a frame that is not JSON", frame: "not-json", expected: "not-json" },
 {
 name: "a task event carrying a status message",
 frame: JSON.stringify({
 result: {
 kind: "task",
 status: { message: { parts: [{ kind: "text", text: "task-text" }] } },
 },
 }),
 expected: "task-text",
 },
 ])("streams text extracted from $name", async ({ frame, expected }) => {
 const { url } = await inspectorFor(sseAgent([frame]), "A2A");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe(`data: ${JSON.stringify(expected)}\n\n`);
 });

 test("drops a task frame that carries no renderable parts", async () => {
 const { url } = await inspectorFor(
 sseAgent([JSON.stringify({ result: { kind: "task" } })]),
 "A2A",
 );
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe("");
 });

 test("passes a non-JSON A2A response through as plain text", async () => {
 const { url } = await inspectorFor(
 () => ({ status: 200, headers: { "Content-Type": "text/plain" }, body: "not json" }),
 "A2A",
 );
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("text/plain");
 expect(await response.text()).toBe("not json");
 });

 test("requires a prompt", async () => {
 const { url } = await inspectorFor(sseAgent([]), "A2A");
 const response = await post(url, "/invocations", { agentName: "orders" });
 expect(response.status).toBe(400);
 expect(await response.json()).toEqual({ success: false, error: "prompt is required" });
 });
});

describe("AGUI agent invocation", () => {
 test("sends a RunAgentInput body and passes the response through", async () => {
 let body: Record<string, unknown> | undefined;
 const { url } = await inspectorFor((request) => {
 body = JSON.parse(request.body.toString()) as Record<string, unknown>;
 return {
 status: 200,
 headers: { "Content-Type": "text/event-stream" },
 body: "data: passthrough\n\n",
 };
 }, "AGUI");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(body).toMatchObject({ messages: [{ role: "user", content: "hi" }] });
 expect(await response.text()).toBe("data: passthrough\n\n");
 });

 test("requires a prompt", async () => {
 const { url } = await inspectorFor(sseAgent([]), "AGUI");
 const response = await post(url, "/invocations", { agentName: "orders" });
 expect(response.status).toBe(400);
 expect(await response.json()).toEqual({ success: false, error: "prompt is required" });
 });
});
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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); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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feat(dev): agent-proxy routes for the Agent Inspector#2085

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tejaskash
merged 5 commits into

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Aug 26, 2026
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feat(dev): agent-proxy routes for the Agent Inspector
#2085
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a068c2d

feat(dev): agent-proxy routes for the Agent Inspector


tejaskash Aug 24, 2026
41322f4

refactor(inspector): simplify agent-proxy routes


tejaskash Aug 24, 2026
d720c70

refactor(inspector): drop comments that restate the code


tejaskash Aug 26, 2026
0c0f90f

refactor(inspector): simplify A2A text extraction and invocation disp…


tejaskash Aug 26, 2026
279c0da

test(inspector): cover resource mapping and proxy error paths


tejaskash Aug 26, 2026

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254 changes: 254 additions & 0 deletions
src/core/dev/inspector/invocations.test.ts

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,254 @@
import { afterEach, describe, expect, test } from "bun:test";
import { type HttpRequestHandler, startHttpServer } from "../../../io/httpServer";
import { parseAgentEvent } from "./invocations";
import { ServerFarm, fakeSupervisor, post, runningAgent } from "./testkit";
import type { InspectorDeps } from "./types";

const farm = new ServerFarm();
afterEach(() => farm.close());

function sseAgent(frames: string[]): HttpRequestHandler {
 return () => ({
 status: 200,
 headers: { "Content-Type": "text/event-stream" },
 body: frames.map((frame) => `data: ${frame}\n\n`).join(""),
 });
}

async function inspectorFor(handler: HttpRequestHandler, protocol = "HTTP") {
 const agent = await farm.serve(handler);
 const supervisor = fakeSupervisor({ agents: [runningAgent("orders", agent.port, protocol)] });
 return farm.inspector({ supervisor } satisfies InspectorDeps);
}

describe("POST /invocations routing", () => {
 test("returns 409 when no agent is running", async () => {
 const { url } = await farm.inspector({ supervisor: fakeSupervisor() });
 const response = await post(url, "/invocations", { prompt: "hi" });
 expect(response.status).toBe(409);
 expect(await response.json()).toMatchObject({ success: false });
 });

 test("directs MCP agents to the dedicated proxy instead of mis-proxying them", async () => {
 const { url } = await inspectorFor(sseAgent([]), "MCP");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.status).toBe(400);
 expect(await response.json()).toEqual({
 success: false,
 error: "MCP agents are invoked through POST /api/mcp, not /invocations.",
 });
 });
});

describe("upstream connection failures", () => {
 async function deadPort(): Promise<number> {
 const handle = await startHttpServer(() => ({ status: 200 }));
 await handle.close();
 return handle.port;
 }

 test.each([
 { protocol: "HTTP", errorPrefix: "Agent server error" },
 { protocol: "A2A", errorPrefix: "A2A agent error" },
 ])("returns 502 when a $protocol agent is unreachable", async ({ protocol, errorPrefix }) => {
 const supervisor = fakeSupervisor({
 agents: [runningAgent("orders", await deadPort(), protocol)],
 });
 const { url } = await farm.inspector({ supervisor });
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.status).toBe(502);
 const body = (await response.json()) as { success: boolean; error: string };
 expect(body.success).toBe(false);
 expect(body.error).toContain(errorPrefix);
 });
});

describe("parseAgentEvent drops non-renderable frames", () => {
 test.each([
 { name: "a JSON primitive that is not text", data: JSON.stringify(42) },
 { name: "a blank error field", data: JSON.stringify({ error: "" }) },
 { name: "a blank text field", data: JSON.stringify({ text: "" }) },
 { name: "an empty non-JSON token", data: "" },
 ])("returns null for $name", ({ data }) => {
 expect(parseAgentEvent(data)).toBeNull();
 });
});

describe("HTTP agent SSE normalization", () => {
 test.each([
 { name: "a bedrock text event", frame: JSON.stringify({ text: "hello" }), expected: "hello" },
 { name: "a bare JSON string token", frame: JSON.stringify("world"), expected: "world" },
 {
 name: "a ConverseStream content delta",
 frame: JSON.stringify({ event: { contentBlockDelta: { delta: { text: "delta" } } } }),
 expected: "delta",
 },
 { name: "a non-JSON plain-text token", frame: "raw-token", expected: "raw-token" },
 ])("normalizes $name to a data frame", async ({ frame, expected }) => {
 const { url } = await inspectorFor(sseAgent([frame]));
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("text/event-stream");
 expect(await response.text()).toBe(`data: ${JSON.stringify(expected)}\n\n`);
 });

 test("re-frames an agent error event as an error payload", async () => {
 const { url } = await inspectorFor(sseAgent([JSON.stringify({ error: "boom" })]));
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe(`data: ${JSON.stringify({ error: "boom" })}\n\n`);
 });

 test("passes a non-SSE response body through untouched", async () => {
@HweinstockHweinstockAug 26, 2026

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i like how readable these tests are.
 const { url } = await inspectorFor(() => ({
 status: 200,
 headers: { "Content-Type": "application/json" },
 body: JSON.stringify({ answer: 42 }),
 }));
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("application/json");
 expect(await response.json()).toEqual({ answer: 42 });
 });

 test("echoes one session id and forwards it to the agent", async () => {
 let received: string | undefined;
 const { url } = await inspectorFor((request) => {
 received = request.headers["x-amzn-bedrock-agentcore-runtime-session-id"] as string;
 return { status: 200, headers: { "Content-Type": "text/event-stream" }, body: "" };
 });
 const response = await post(url, "/invocations", {
 agentName: "orders",
 prompt: "hi",
 sessionId: "session-42",
 });
 expect(response.headers.get("x-session-id")).toBe("session-42");
 expect(received).toBe("session-42");
 });
});

describe("A2A agent invocation", () => {
 test("translates the prompt to message/stream and reduces events to text frames", async () => {
 let rpcMethod: string | undefined;
 const { url } = await inspectorFor((request) => {
 rpcMethod = (JSON.parse(request.body.toString()) as { method: string }).method;
 const status = JSON.stringify({
 result: {
 kind: "status-update",
 status: { message: { parts: [{ kind: "text", text: "streamed" }] } },
 },
 });
 return {
 status: 200,
 headers: { "Content-Type": "text/event-stream" },
 body: `data: ${status}\n\n`,
 };
 }, "A2A");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(rpcMethod).toBe("message/stream");
 expect(await response.text()).toBe(`data: ${JSON.stringify("streamed")}\n\n`);
 });

 test("skips artifact text already streamed by a preceding status-update", async () => {
 const status = JSON.stringify({
 result: {
 kind: "status-update",
 status: { message: { parts: [{ kind: "text", text: "answer" }] } },
 },
 });
 const artifact = JSON.stringify({
 result: { kind: "artifact-update", artifact: { parts: [{ kind: "text", text: "answer" }] } },
 });
 const { url } = await inspectorFor(sseAgent([status, artifact]), "A2A");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe(`data: ${JSON.stringify("answer")}\n\n`);
 });

 test("falls back to extracting text from a non-streaming JSON-RPC result", async () => {
 const { url } = await inspectorFor(
 () => ({
 status: 200,
 headers: { "Content-Type": "application/json" },
 body: JSON.stringify({
 result: { artifacts: [{ parts: [{ kind: "text", text: "final" }] }] },
 }),
 }),
 "A2A",
 );
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("text/event-stream");
 expect(await response.text()).toBe(`data: ${JSON.stringify("final")}\n\n`);
 });

 test.each([
 {
 name: "an artifact-update with no preceding status-update",
 frame: JSON.stringify({
 result: { kind: "artifact-update", artifact: { parts: [{ kind: "text", text: "art" }] } },
 }),
 expected: "art",
 },
 { name: "a frame that is not JSON", frame: "not-json", expected: "not-json" },
 {
 name: "a task event carrying a status message",
 frame: JSON.stringify({
 result: {
 kind: "task",
 status: { message: { parts: [{ kind: "text", text: "task-text" }] } },
 },
 }),
 expected: "task-text",
 },
 ])("streams text extracted from $name", async ({ frame, expected }) => {
 const { url } = await inspectorFor(sseAgent([frame]), "A2A");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe(`data: ${JSON.stringify(expected)}\n\n`);
 });

 test("drops a task frame that carries no renderable parts", async () => {
 const { url } = await inspectorFor(
 sseAgent([JSON.stringify({ result: { kind: "task" } })]),
 "A2A",
 );
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe("");
 });

 test("passes a non-JSON A2A response through as plain text", async () => {
 const { url } = await inspectorFor(
 () => ({ status: 200, headers: { "Content-Type": "text/plain" }, body: "not json" }),
 "A2A",
 );
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("text/plain");
 expect(await response.text()).toBe("not json");
 });

 test("requires a prompt", async () => {
 const { url } = await inspectorFor(sseAgent([]), "A2A");
 const response = await post(url, "/invocations", { agentName: "orders" });
 expect(response.status).toBe(400);
 expect(await response.json()).toEqual({ success: false, error: "prompt is required" });
 });
});

describe("AGUI agent invocation", () => {
 test("sends a RunAgentInput body and passes the response through", async () => {
 let body: Record<string, unknown> | undefined;
 const { url } = await inspectorFor((request) => {
 body = JSON.parse(request.body.toString()) as Record<string, unknown>;
 return {
 status: 200,
 headers: { "Content-Type": "text/event-stream" },
 body: "data: passthrough\n\n",
 };
 }, "AGUI");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(body).toMatchObject({ messages: [{ role: "user", content: "hi" }] });
 expect(await response.text()).toBe("data: passthrough\n\n");
 });

 test("requires a prompt", async () => {
 const { url } = await inspectorFor(sseAgent([]), "AGUI");
 const response = await post(url, "/invocations", { agentName: "orders" });
 expect(response.status).toBe(400);
 expect(await response.json()).toEqual({ success: false, error: "prompt is required" });
 });
});
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('^' + ".*" + '

Skip to content
feat(dev): agent-proxy routes for the Agent Inspector#2085

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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privacy statement. We’ll occasionally send you account related emails.

Already on GitHub?
Sign in
to your account

 Merged

tejaskash
merged 5 commits into

from

Aug 26, 2026
 Merged


feat(dev): agent-proxy routes for the Agent Inspector
#2085
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a068c2d

feat(dev): agent-proxy routes for the Agent Inspector


tejaskash Aug 24, 2026
41322f4

refactor(inspector): simplify agent-proxy routes


tejaskash Aug 24, 2026
d720c70

refactor(inspector): drop comments that restate the code


tejaskash Aug 26, 2026
0c0f90f

refactor(inspector): simplify A2A text extraction and invocation disp…


tejaskash Aug 26, 2026
279c0da

test(inspector): cover resource mapping and proxy error paths


tejaskash Aug 26, 2026

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254 changes: 254 additions & 0 deletions
src/core/dev/inspector/invocations.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -0,0 +1,254 @@
import { afterEach, describe, expect, test } from "bun:test";
import { type HttpRequestHandler, startHttpServer } from "../../../io/httpServer";
import { parseAgentEvent } from "./invocations";
import { ServerFarm, fakeSupervisor, post, runningAgent } from "./testkit";
import type { InspectorDeps } from "./types";

const farm = new ServerFarm();
afterEach(() => farm.close());

function sseAgent(frames: string[]): HttpRequestHandler {
 return () => ({
 status: 200,
 headers: { "Content-Type": "text/event-stream" },
 body: frames.map((frame) => `data: ${frame}\n\n`).join(""),
 });
}

async function inspectorFor(handler: HttpRequestHandler, protocol = "HTTP") {
 const agent = await farm.serve(handler);
 const supervisor = fakeSupervisor({ agents: [runningAgent("orders", agent.port, protocol)] });
 return farm.inspector({ supervisor } satisfies InspectorDeps);
}

describe("POST /invocations routing", () => {
 test("returns 409 when no agent is running", async () => {
 const { url } = await farm.inspector({ supervisor: fakeSupervisor() });
 const response = await post(url, "/invocations", { prompt: "hi" });
 expect(response.status).toBe(409);
 expect(await response.json()).toMatchObject({ success: false });
 });

 test("directs MCP agents to the dedicated proxy instead of mis-proxying them", async () => {
 const { url } = await inspectorFor(sseAgent([]), "MCP");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.status).toBe(400);
 expect(await response.json()).toEqual({
 success: false,
 error: "MCP agents are invoked through POST /api/mcp, not /invocations.",
 });
 });
});

describe("upstream connection failures", () => {
 async function deadPort(): Promise<number> {
 const handle = await startHttpServer(() => ({ status: 200 }));
 await handle.close();
 return handle.port;
 }

 test.each([
 { protocol: "HTTP", errorPrefix: "Agent server error" },
 { protocol: "A2A", errorPrefix: "A2A agent error" },
 ])("returns 502 when a $protocol agent is unreachable", async ({ protocol, errorPrefix }) => {
 const supervisor = fakeSupervisor({
 agents: [runningAgent("orders", await deadPort(), protocol)],
 });
 const { url } = await farm.inspector({ supervisor });
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.status).toBe(502);
 const body = (await response.json()) as { success: boolean; error: string };
 expect(body.success).toBe(false);
 expect(body.error).toContain(errorPrefix);
 });
});

describe("parseAgentEvent drops non-renderable frames", () => {
 test.each([
 { name: "a JSON primitive that is not text", data: JSON.stringify(42) },
 { name: "a blank error field", data: JSON.stringify({ error: "" }) },
 { name: "a blank text field", data: JSON.stringify({ text: "" }) },
 { name: "an empty non-JSON token", data: "" },
 ])("returns null for $name", ({ data }) => {
 expect(parseAgentEvent(data)).toBeNull();
 });
});

describe("HTTP agent SSE normalization", () => {
 test.each([
 { name: "a bedrock text event", frame: JSON.stringify({ text: "hello" }), expected: "hello" },
 { name: "a bare JSON string token", frame: JSON.stringify("world"), expected: "world" },
 {
 name: "a ConverseStream content delta",
 frame: JSON.stringify({ event: { contentBlockDelta: { delta: { text: "delta" } } } }),
 expected: "delta",
 },
 { name: "a non-JSON plain-text token", frame: "raw-token", expected: "raw-token" },
 ])("normalizes $name to a data frame", async ({ frame, expected }) => {
 const { url } = await inspectorFor(sseAgent([frame]));
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("text/event-stream");
 expect(await response.text()).toBe(`data: ${JSON.stringify(expected)}\n\n`);
 });

 test("re-frames an agent error event as an error payload", async () => {
 const { url } = await inspectorFor(sseAgent([JSON.stringify({ error: "boom" })]));
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe(`data: ${JSON.stringify({ error: "boom" })}\n\n`);
 });

 test("passes a non-SSE response body through untouched", async () => {
@HweinstockHweinstockAug 26, 2026

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Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

i like how readable these tests are.
 const { url } = await inspectorFor(() => ({
 status: 200,
 headers: { "Content-Type": "application/json" },
 body: JSON.stringify({ answer: 42 }),
 }));
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("application/json");
 expect(await response.json()).toEqual({ answer: 42 });
 });

 test("echoes one session id and forwards it to the agent", async () => {
 let received: string | undefined;
 const { url } = await inspectorFor((request) => {
 received = request.headers["x-amzn-bedrock-agentcore-runtime-session-id"] as string;
 return { status: 200, headers: { "Content-Type": "text/event-stream" }, body: "" };
 });
 const response = await post(url, "/invocations", {
 agentName: "orders",
 prompt: "hi",
 sessionId: "session-42",
 });
 expect(response.headers.get("x-session-id")).toBe("session-42");
 expect(received).toBe("session-42");
 });
});

describe("A2A agent invocation", () => {
 test("translates the prompt to message/stream and reduces events to text frames", async () => {
 let rpcMethod: string | undefined;
 const { url } = await inspectorFor((request) => {
 rpcMethod = (JSON.parse(request.body.toString()) as { method: string }).method;
 const status = JSON.stringify({
 result: {
 kind: "status-update",
 status: { message: { parts: [{ kind: "text", text: "streamed" }] } },
 },
 });
 return {
 status: 200,
 headers: { "Content-Type": "text/event-stream" },
 body: `data: ${status}\n\n`,
 };
 }, "A2A");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(rpcMethod).toBe("message/stream");
 expect(await response.text()).toBe(`data: ${JSON.stringify("streamed")}\n\n`);
 });

 test("skips artifact text already streamed by a preceding status-update", async () => {
 const status = JSON.stringify({
 result: {
 kind: "status-update",
 status: { message: { parts: [{ kind: "text", text: "answer" }] } },
 },
 });
 const artifact = JSON.stringify({
 result: { kind: "artifact-update", artifact: { parts: [{ kind: "text", text: "answer" }] } },
 });
 const { url } = await inspectorFor(sseAgent([status, artifact]), "A2A");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe(`data: ${JSON.stringify("answer")}\n\n`);
 });

 test("falls back to extracting text from a non-streaming JSON-RPC result", async () => {
 const { url } = await inspectorFor(
 () => ({
 status: 200,
 headers: { "Content-Type": "application/json" },
 body: JSON.stringify({
 result: { artifacts: [{ parts: [{ kind: "text", text: "final" }] }] },
 }),
 }),
 "A2A",
 );
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("text/event-stream");
 expect(await response.text()).toBe(`data: ${JSON.stringify("final")}\n\n`);
 });

 test.each([
 {
 name: "an artifact-update with no preceding status-update",
 frame: JSON.stringify({
 result: { kind: "artifact-update", artifact: { parts: [{ kind: "text", text: "art" }] } },
 }),
 expected: "art",
 },
 { name: "a frame that is not JSON", frame: "not-json", expected: "not-json" },
 {
 name: "a task event carrying a status message",
 frame: JSON.stringify({
 result: {
 kind: "task",
 status: { message: { parts: [{ kind: "text", text: "task-text" }] } },
 },
 }),
 expected: "task-text",
 },
 ])("streams text extracted from $name", async ({ frame, expected }) => {
 const { url } = await inspectorFor(sseAgent([frame]), "A2A");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe(`data: ${JSON.stringify(expected)}\n\n`);
 });

 test("drops a task frame that carries no renderable parts", async () => {
 const { url } = await inspectorFor(
 sseAgent([JSON.stringify({ result: { kind: "task" } })]),
 "A2A",
 );
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe("");
 });

 test("passes a non-JSON A2A response through as plain text", async () => {
 const { url } = await inspectorFor(
 () => ({ status: 200, headers: { "Content-Type": "text/plain" }, body: "not json" }),
 "A2A",
 );
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("text/plain");
 expect(await response.text()).toBe("not json");
 });

 test("requires a prompt", async () => {
 const { url } = await inspectorFor(sseAgent([]), "A2A");
 const response = await post(url, "/invocations", { agentName: "orders" });
 expect(response.status).toBe(400);
 expect(await response.json()).toEqual({ success: false, error: "prompt is required" });
 });
});

describe("AGUI agent invocation", () => {
 test("sends a RunAgentInput body and passes the response through", async () => {
 let body: Record<string, unknown> | undefined;
 const { url } = await inspectorFor((request) => {
 body = JSON.parse(request.body.toString()) as Record<string, unknown>;
 return {
 status: 200,
 headers: { "Content-Type": "text/event-stream" },
 body: "data: passthrough\n\n",
 };
 }, "AGUI");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(body).toMatchObject({ messages: [{ role: "user", content: "hi" }] });
 expect(await response.text()).toBe("data: passthrough\n\n");
 });

 test("requires a prompt", async () => {
 const { url } = await inspectorFor(sseAgent([]), "AGUI");
 const response = await post(url, "/invocations", { agentName: "orders" });
 expect(response.status).toBe(400);
 expect(await response.json()).toEqual({ success: false, error: "prompt is required" });
 });
});
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" + '

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feat(dev): agent-proxy routes for the Agent Inspector#2085

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 Merged

tejaskash
merged 5 commits into

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Aug 26, 2026
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feat(dev): agent-proxy routes for the Agent Inspector
#2085
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a068c2d

feat(dev): agent-proxy routes for the Agent Inspector


tejaskash Aug 24, 2026
41322f4

refactor(inspector): simplify agent-proxy routes


tejaskash Aug 24, 2026
d720c70

refactor(inspector): drop comments that restate the code


tejaskash Aug 26, 2026
0c0f90f

refactor(inspector): simplify A2A text extraction and invocation disp…


tejaskash Aug 26, 2026
279c0da

test(inspector): cover resource mapping and proxy error paths


tejaskash Aug 26, 2026

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254 changes: 254 additions & 0 deletions
src/core/dev/inspector/invocations.test.ts

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,254 @@
import { afterEach, describe, expect, test } from "bun:test";
import { type HttpRequestHandler, startHttpServer } from "../../../io/httpServer";
import { parseAgentEvent } from "./invocations";
import { ServerFarm, fakeSupervisor, post, runningAgent } from "./testkit";
import type { InspectorDeps } from "./types";

const farm = new ServerFarm();
afterEach(() => farm.close());

function sseAgent(frames: string[]): HttpRequestHandler {
 return () => ({
 status: 200,
 headers: { "Content-Type": "text/event-stream" },
 body: frames.map((frame) => `data: ${frame}\n\n`).join(""),
 });
}

async function inspectorFor(handler: HttpRequestHandler, protocol = "HTTP") {
 const agent = await farm.serve(handler);
 const supervisor = fakeSupervisor({ agents: [runningAgent("orders", agent.port, protocol)] });
 return farm.inspector({ supervisor } satisfies InspectorDeps);
}

describe("POST /invocations routing", () => {
 test("returns 409 when no agent is running", async () => {
 const { url } = await farm.inspector({ supervisor: fakeSupervisor() });
 const response = await post(url, "/invocations", { prompt: "hi" });
 expect(response.status).toBe(409);
 expect(await response.json()).toMatchObject({ success: false });
 });

 test("directs MCP agents to the dedicated proxy instead of mis-proxying them", async () => {
 const { url } = await inspectorFor(sseAgent([]), "MCP");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.status).toBe(400);
 expect(await response.json()).toEqual({
 success: false,
 error: "MCP agents are invoked through POST /api/mcp, not /invocations.",
 });
 });
});

describe("upstream connection failures", () => {
 async function deadPort(): Promise<number> {
 const handle = await startHttpServer(() => ({ status: 200 }));
 await handle.close();
 return handle.port;
 }

 test.each([
 { protocol: "HTTP", errorPrefix: "Agent server error" },
 { protocol: "A2A", errorPrefix: "A2A agent error" },
 ])("returns 502 when a $protocol agent is unreachable", async ({ protocol, errorPrefix }) => {
 const supervisor = fakeSupervisor({
 agents: [runningAgent("orders", await deadPort(), protocol)],
 });
 const { url } = await farm.inspector({ supervisor });
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.status).toBe(502);
 const body = (await response.json()) as { success: boolean; error: string };
 expect(body.success).toBe(false);
 expect(body.error).toContain(errorPrefix);
 });
});

describe("parseAgentEvent drops non-renderable frames", () => {
 test.each([
 { name: "a JSON primitive that is not text", data: JSON.stringify(42) },
 { name: "a blank error field", data: JSON.stringify({ error: "" }) },
 { name: "a blank text field", data: JSON.stringify({ text: "" }) },
 { name: "an empty non-JSON token", data: "" },
 ])("returns null for $name", ({ data }) => {
 expect(parseAgentEvent(data)).toBeNull();
 });
});

describe("HTTP agent SSE normalization", () => {
 test.each([
 { name: "a bedrock text event", frame: JSON.stringify({ text: "hello" }), expected: "hello" },
 { name: "a bare JSON string token", frame: JSON.stringify("world"), expected: "world" },
 {
 name: "a ConverseStream content delta",
 frame: JSON.stringify({ event: { contentBlockDelta: { delta: { text: "delta" } } } }),
 expected: "delta",
 },
 { name: "a non-JSON plain-text token", frame: "raw-token", expected: "raw-token" },
 ])("normalizes $name to a data frame", async ({ frame, expected }) => {
 const { url } = await inspectorFor(sseAgent([frame]));
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("text/event-stream");
 expect(await response.text()).toBe(`data: ${JSON.stringify(expected)}\n\n`);
 });

 test("re-frames an agent error event as an error payload", async () => {
 const { url } = await inspectorFor(sseAgent([JSON.stringify({ error: "boom" })]));
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe(`data: ${JSON.stringify({ error: "boom" })}\n\n`);
 });

 test("passes a non-SSE response body through untouched", async () => {
@HweinstockHweinstockAug 26, 2026

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i like how readable these tests are.
 const { url } = await inspectorFor(() => ({
 status: 200,
 headers: { "Content-Type": "application/json" },
 body: JSON.stringify({ answer: 42 }),
 }));
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("application/json");
 expect(await response.json()).toEqual({ answer: 42 });
 });

 test("echoes one session id and forwards it to the agent", async () => {
 let received: string | undefined;
 const { url } = await inspectorFor((request) => {
 received = request.headers["x-amzn-bedrock-agentcore-runtime-session-id"] as string;
 return { status: 200, headers: { "Content-Type": "text/event-stream" }, body: "" };
 });
 const response = await post(url, "/invocations", {
 agentName: "orders",
 prompt: "hi",
 sessionId: "session-42",
 });
 expect(response.headers.get("x-session-id")).toBe("session-42");
 expect(received).toBe("session-42");
 });
});

describe("A2A agent invocation", () => {
 test("translates the prompt to message/stream and reduces events to text frames", async () => {
 let rpcMethod: string | undefined;
 const { url } = await inspectorFor((request) => {
 rpcMethod = (JSON.parse(request.body.toString()) as { method: string }).method;
 const status = JSON.stringify({
 result: {
 kind: "status-update",
 status: { message: { parts: [{ kind: "text", text: "streamed" }] } },
 },
 });
 return {
 status: 200,
 headers: { "Content-Type": "text/event-stream" },
 body: `data: ${status}\n\n`,
 };
 }, "A2A");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(rpcMethod).toBe("message/stream");
 expect(await response.text()).toBe(`data: ${JSON.stringify("streamed")}\n\n`);
 });

 test("skips artifact text already streamed by a preceding status-update", async () => {
 const status = JSON.stringify({
 result: {
 kind: "status-update",
 status: { message: { parts: [{ kind: "text", text: "answer" }] } },
 },
 });
 const artifact = JSON.stringify({
 result: { kind: "artifact-update", artifact: { parts: [{ kind: "text", text: "answer" }] } },
 });
 const { url } = await inspectorFor(sseAgent([status, artifact]), "A2A");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe(`data: ${JSON.stringify("answer")}\n\n`);
 });

 test("falls back to extracting text from a non-streaming JSON-RPC result", async () => {
 const { url } = await inspectorFor(
 () => ({
 status: 200,
 headers: { "Content-Type": "application/json" },
 body: JSON.stringify({
 result: { artifacts: [{ parts: [{ kind: "text", text: "final" }] }] },
 }),
 }),
 "A2A",
 );
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("text/event-stream");
 expect(await response.text()).toBe(`data: ${JSON.stringify("final")}\n\n`);
 });

 test.each([
 {
 name: "an artifact-update with no preceding status-update",
 frame: JSON.stringify({
 result: { kind: "artifact-update", artifact: { parts: [{ kind: "text", text: "art" }] } },
 }),
 expected: "art",
 },
 { name: "a frame that is not JSON", frame: "not-json", expected: "not-json" },
 {
 name: "a task event carrying a status message",
 frame: JSON.stringify({
 result: {
 kind: "task",
 status: { message: { parts: [{ kind: "text", text: "task-text" }] } },
 },
 }),
 expected: "task-text",
 },
 ])("streams text extracted from $name", async ({ frame, expected }) => {
 const { url } = await inspectorFor(sseAgent([frame]), "A2A");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe(`data: ${JSON.stringify(expected)}\n\n`);
 });

 test("drops a task frame that carries no renderable parts", async () => {
 const { url } = await inspectorFor(
 sseAgent([JSON.stringify({ result: { kind: "task" } })]),
 "A2A",
 );
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe("");
 });

 test("passes a non-JSON A2A response through as plain text", async () => {
 const { url } = await inspectorFor(
 () => ({ status: 200, headers: { "Content-Type": "text/plain" }, body: "not json" }),
 "A2A",
 );
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("text/plain");
 expect(await response.text()).toBe("not json");
 });

 test("requires a prompt", async () => {
 const { url } = await inspectorFor(sseAgent([]), "A2A");
 const response = await post(url, "/invocations", { agentName: "orders" });
 expect(response.status).toBe(400);
 expect(await response.json()).toEqual({ success: false, error: "prompt is required" });
 });
});

describe("AGUI agent invocation", () => {
 test("sends a RunAgentInput body and passes the response through", async () => {
 let body: Record<string, unknown> | undefined;
 const { url } = await inspectorFor((request) => {
 body = JSON.parse(request.body.toString()) as Record<string, unknown>;
 return {
 status: 200,
 headers: { "Content-Type": "text/event-stream" },
 body: "data: passthrough\n\n",
 };
 }, "AGUI");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(body).toMatchObject({ messages: [{ role: "user", content: "hi" }] });
 expect(await response.text()).toBe("data: passthrough\n\n");
 });

 test("requires a prompt", async () => {
 const { url } = await inspectorFor(sseAgent([]), "AGUI");
 const response = await post(url, "/invocations", { agentName: "orders" });
 expect(response.status).toBe(400);
 expect(await response.json()).toEqual({ success: false, error: "prompt is required" });
 });
});
Loading
Loading

, '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('^' + ".*" + '

Skip to content
feat(dev): agent-proxy routes for the Agent Inspector#2085

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.

Already on GitHub?
Sign in
to your account

 Merged

tejaskash
merged 5 commits into

from

Aug 26, 2026
 Merged


feat(dev): agent-proxy routes for the Agent Inspector
#2085
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a068c2d

feat(dev): agent-proxy routes for the Agent Inspector


tejaskash Aug 24, 2026
41322f4

refactor(inspector): simplify agent-proxy routes


tejaskash Aug 24, 2026
d720c70

refactor(inspector): drop comments that restate the code


tejaskash Aug 26, 2026
0c0f90f

refactor(inspector): simplify A2A text extraction and invocation disp…


tejaskash Aug 26, 2026
279c0da

test(inspector): cover resource mapping and proxy error paths


tejaskash Aug 26, 2026

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254 changes: 254 additions & 0 deletions
src/core/dev/inspector/invocations.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -0,0 +1,254 @@
import { afterEach, describe, expect, test } from "bun:test";
import { type HttpRequestHandler, startHttpServer } from "../../../io/httpServer";
import { parseAgentEvent } from "./invocations";
import { ServerFarm, fakeSupervisor, post, runningAgent } from "./testkit";
import type { InspectorDeps } from "./types";

const farm = new ServerFarm();
afterEach(() => farm.close());

function sseAgent(frames: string[]): HttpRequestHandler {
 return () => ({
 status: 200,
 headers: { "Content-Type": "text/event-stream" },
 body: frames.map((frame) => `data: ${frame}\n\n`).join(""),
 });
}

async function inspectorFor(handler: HttpRequestHandler, protocol = "HTTP") {
 const agent = await farm.serve(handler);
 const supervisor = fakeSupervisor({ agents: [runningAgent("orders", agent.port, protocol)] });
 return farm.inspector({ supervisor } satisfies InspectorDeps);
}

describe("POST /invocations routing", () => {
 test("returns 409 when no agent is running", async () => {
 const { url } = await farm.inspector({ supervisor: fakeSupervisor() });
 const response = await post(url, "/invocations", { prompt: "hi" });
 expect(response.status).toBe(409);
 expect(await response.json()).toMatchObject({ success: false });
 });

 test("directs MCP agents to the dedicated proxy instead of mis-proxying them", async () => {
 const { url } = await inspectorFor(sseAgent([]), "MCP");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.status).toBe(400);
 expect(await response.json()).toEqual({
 success: false,
 error: "MCP agents are invoked through POST /api/mcp, not /invocations.",
 });
 });
});

describe("upstream connection failures", () => {
 async function deadPort(): Promise<number> {
 const handle = await startHttpServer(() => ({ status: 200 }));
 await handle.close();
 return handle.port;
 }

 test.each([
 { protocol: "HTTP", errorPrefix: "Agent server error" },
 { protocol: "A2A", errorPrefix: "A2A agent error" },
 ])("returns 502 when a $protocol agent is unreachable", async ({ protocol, errorPrefix }) => {
 const supervisor = fakeSupervisor({
 agents: [runningAgent("orders", await deadPort(), protocol)],
 });
 const { url } = await farm.inspector({ supervisor });
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.status).toBe(502);
 const body = (await response.json()) as { success: boolean; error: string };
 expect(body.success).toBe(false);
 expect(body.error).toContain(errorPrefix);
 });
});

describe("parseAgentEvent drops non-renderable frames", () => {
 test.each([
 { name: "a JSON primitive that is not text", data: JSON.stringify(42) },
 { name: "a blank error field", data: JSON.stringify({ error: "" }) },
 { name: "a blank text field", data: JSON.stringify({ text: "" }) },
 { name: "an empty non-JSON token", data: "" },
 ])("returns null for $name", ({ data }) => {
 expect(parseAgentEvent(data)).toBeNull();
 });
});

describe("HTTP agent SSE normalization", () => {
 test.each([
 { name: "a bedrock text event", frame: JSON.stringify({ text: "hello" }), expected: "hello" },
 { name: "a bare JSON string token", frame: JSON.stringify("world"), expected: "world" },
 {
 name: "a ConverseStream content delta",
 frame: JSON.stringify({ event: { contentBlockDelta: { delta: { text: "delta" } } } }),
 expected: "delta",
 },
 { name: "a non-JSON plain-text token", frame: "raw-token", expected: "raw-token" },
 ])("normalizes $name to a data frame", async ({ frame, expected }) => {
 const { url } = await inspectorFor(sseAgent([frame]));
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("text/event-stream");
 expect(await response.text()).toBe(`data: ${JSON.stringify(expected)}\n\n`);
 });

 test("re-frames an agent error event as an error payload", async () => {
 const { url } = await inspectorFor(sseAgent([JSON.stringify({ error: "boom" })]));
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe(`data: ${JSON.stringify({ error: "boom" })}\n\n`);
 });

 test("passes a non-SSE response body through untouched", async () => {
@HweinstockHweinstockAug 26, 2026

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Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

i like how readable these tests are.
 const { url } = await inspectorFor(() => ({
 status: 200,
 headers: { "Content-Type": "application/json" },
 body: JSON.stringify({ answer: 42 }),
 }));
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("application/json");
 expect(await response.json()).toEqual({ answer: 42 });
 });

 test("echoes one session id and forwards it to the agent", async () => {
 let received: string | undefined;
 const { url } = await inspectorFor((request) => {
 received = request.headers["x-amzn-bedrock-agentcore-runtime-session-id"] as string;
 return { status: 200, headers: { "Content-Type": "text/event-stream" }, body: "" };
 });
 const response = await post(url, "/invocations", {
 agentName: "orders",
 prompt: "hi",
 sessionId: "session-42",
 });
 expect(response.headers.get("x-session-id")).toBe("session-42");
 expect(received).toBe("session-42");
 });
});

describe("A2A agent invocation", () => {
 test("translates the prompt to message/stream and reduces events to text frames", async () => {
 let rpcMethod: string | undefined;
 const { url } = await inspectorFor((request) => {
 rpcMethod = (JSON.parse(request.body.toString()) as { method: string }).method;
 const status = JSON.stringify({
 result: {
 kind: "status-update",
 status: { message: { parts: [{ kind: "text", text: "streamed" }] } },
 },
 });
 return {
 status: 200,
 headers: { "Content-Type": "text/event-stream" },
 body: `data: ${status}\n\n`,
 };
 }, "A2A");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(rpcMethod).toBe("message/stream");
 expect(await response.text()).toBe(`data: ${JSON.stringify("streamed")}\n\n`);
 });

 test("skips artifact text already streamed by a preceding status-update", async () => {
 const status = JSON.stringify({
 result: {
 kind: "status-update",
 status: { message: { parts: [{ kind: "text", text: "answer" }] } },
 },
 });
 const artifact = JSON.stringify({
 result: { kind: "artifact-update", artifact: { parts: [{ kind: "text", text: "answer" }] } },
 });
 const { url } = await inspectorFor(sseAgent([status, artifact]), "A2A");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe(`data: ${JSON.stringify("answer")}\n\n`);
 });

 test("falls back to extracting text from a non-streaming JSON-RPC result", async () => {
 const { url } = await inspectorFor(
 () => ({
 status: 200,
 headers: { "Content-Type": "application/json" },
 body: JSON.stringify({
 result: { artifacts: [{ parts: [{ kind: "text", text: "final" }] }] },
 }),
 }),
 "A2A",
 );
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("text/event-stream");
 expect(await response.text()).toBe(`data: ${JSON.stringify("final")}\n\n`);
 });

 test.each([
 {
 name: "an artifact-update with no preceding status-update",
 frame: JSON.stringify({
 result: { kind: "artifact-update", artifact: { parts: [{ kind: "text", text: "art" }] } },
 }),
 expected: "art",
 },
 { name: "a frame that is not JSON", frame: "not-json", expected: "not-json" },
 {
 name: "a task event carrying a status message",
 frame: JSON.stringify({
 result: {
 kind: "task",
 status: { message: { parts: [{ kind: "text", text: "task-text" }] } },
 },
 }),
 expected: "task-text",
 },
 ])("streams text extracted from $name", async ({ frame, expected }) => {
 const { url } = await inspectorFor(sseAgent([frame]), "A2A");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe(`data: ${JSON.stringify(expected)}\n\n`);
 });

 test("drops a task frame that carries no renderable parts", async () => {
 const { url } = await inspectorFor(
 sseAgent([JSON.stringify({ result: { kind: "task" } })]),
 "A2A",
 );
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe("");
 });

 test("passes a non-JSON A2A response through as plain text", async () => {
 const { url } = await inspectorFor(
 () => ({ status: 200, headers: { "Content-Type": "text/plain" }, body: "not json" }),
 "A2A",
 );
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("text/plain");
 expect(await response.text()).toBe("not json");
 });

 test("requires a prompt", async () => {
 const { url } = await inspectorFor(sseAgent([]), "A2A");
 const response = await post(url, "/invocations", { agentName: "orders" });
 expect(response.status).toBe(400);
 expect(await response.json()).toEqual({ success: false, error: "prompt is required" });
 });
});

describe("AGUI agent invocation", () => {
 test("sends a RunAgentInput body and passes the response through", async () => {
 let body: Record<string, unknown> | undefined;
 const { url } = await inspectorFor((request) => {
 body = JSON.parse(request.body.toString()) as Record<string, unknown>;
 return {
 status: 200,
 headers: { "Content-Type": "text/event-stream" },
 body: "data: passthrough\n\n",
 };
 }, "AGUI");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(body).toMatchObject({ messages: [{ role: "user", content: "hi" }] });
 expect(await response.text()).toBe("data: passthrough\n\n");
 });

 test("requires a prompt", async () => {
 const { url } = await inspectorFor(sseAgent([]), "AGUI");
 const response = await post(url, "/invocations", { agentName: "orders" });
 expect(response.status).toBe(400);
 expect(await response.json()).toEqual({ success: false, error: "prompt is required" });
 });
});
Loading
Loading

, '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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feat(dev): agent-proxy routes for the Agent Inspector#2085

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 Merged

tejaskash
merged 5 commits into

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Aug 26, 2026
 Merged


feat(dev): agent-proxy routes for the Agent Inspector
#2085
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a068c2d

feat(dev): agent-proxy routes for the Agent Inspector


tejaskash Aug 24, 2026
41322f4

refactor(inspector): simplify agent-proxy routes


tejaskash Aug 24, 2026
d720c70

refactor(inspector): drop comments that restate the code


tejaskash Aug 26, 2026
0c0f90f

refactor(inspector): simplify A2A text extraction and invocation disp…


tejaskash Aug 26, 2026
279c0da

test(inspector): cover resource mapping and proxy error paths


tejaskash Aug 26, 2026

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254 changes: 254 additions & 0 deletions
src/core/dev/inspector/invocations.test.ts

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,254 @@
import { afterEach, describe, expect, test } from "bun:test";
import { type HttpRequestHandler, startHttpServer } from "../../../io/httpServer";
import { parseAgentEvent } from "./invocations";
import { ServerFarm, fakeSupervisor, post, runningAgent } from "./testkit";
import type { InspectorDeps } from "./types";

const farm = new ServerFarm();
afterEach(() => farm.close());

function sseAgent(frames: string[]): HttpRequestHandler {
 return () => ({
 status: 200,
 headers: { "Content-Type": "text/event-stream" },
 body: frames.map((frame) => `data: ${frame}\n\n`).join(""),
 });
}

async function inspectorFor(handler: HttpRequestHandler, protocol = "HTTP") {
 const agent = await farm.serve(handler);
 const supervisor = fakeSupervisor({ agents: [runningAgent("orders", agent.port, protocol)] });
 return farm.inspector({ supervisor } satisfies InspectorDeps);
}

describe("POST /invocations routing", () => {
 test("returns 409 when no agent is running", async () => {
 const { url } = await farm.inspector({ supervisor: fakeSupervisor() });
 const response = await post(url, "/invocations", { prompt: "hi" });
 expect(response.status).toBe(409);
 expect(await response.json()).toMatchObject({ success: false });
 });

 test("directs MCP agents to the dedicated proxy instead of mis-proxying them", async () => {
 const { url } = await inspectorFor(sseAgent([]), "MCP");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.status).toBe(400);
 expect(await response.json()).toEqual({
 success: false,
 error: "MCP agents are invoked through POST /api/mcp, not /invocations.",
 });
 });
});

describe("upstream connection failures", () => {
 async function deadPort(): Promise<number> {
 const handle = await startHttpServer(() => ({ status: 200 }));
 await handle.close();
 return handle.port;
 }

 test.each([
 { protocol: "HTTP", errorPrefix: "Agent server error" },
 { protocol: "A2A", errorPrefix: "A2A agent error" },
 ])("returns 502 when a $protocol agent is unreachable", async ({ protocol, errorPrefix }) => {
 const supervisor = fakeSupervisor({
 agents: [runningAgent("orders", await deadPort(), protocol)],
 });
 const { url } = await farm.inspector({ supervisor });
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.status).toBe(502);
 const body = (await response.json()) as { success: boolean; error: string };
 expect(body.success).toBe(false);
 expect(body.error).toContain(errorPrefix);
 });
});

describe("parseAgentEvent drops non-renderable frames", () => {
 test.each([
 { name: "a JSON primitive that is not text", data: JSON.stringify(42) },
 { name: "a blank error field", data: JSON.stringify({ error: "" }) },
 { name: "a blank text field", data: JSON.stringify({ text: "" }) },
 { name: "an empty non-JSON token", data: "" },
 ])("returns null for $name", ({ data }) => {
 expect(parseAgentEvent(data)).toBeNull();
 });
});

describe("HTTP agent SSE normalization", () => {
 test.each([
 { name: "a bedrock text event", frame: JSON.stringify({ text: "hello" }), expected: "hello" },
 { name: "a bare JSON string token", frame: JSON.stringify("world"), expected: "world" },
 {
 name: "a ConverseStream content delta",
 frame: JSON.stringify({ event: { contentBlockDelta: { delta: { text: "delta" } } } }),
 expected: "delta",
 },
 { name: "a non-JSON plain-text token", frame: "raw-token", expected: "raw-token" },
 ])("normalizes $name to a data frame", async ({ frame, expected }) => {
 const { url } = await inspectorFor(sseAgent([frame]));
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("text/event-stream");
 expect(await response.text()).toBe(`data: ${JSON.stringify(expected)}\n\n`);
 });

 test("re-frames an agent error event as an error payload", async () => {
 const { url } = await inspectorFor(sseAgent([JSON.stringify({ error: "boom" })]));
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe(`data: ${JSON.stringify({ error: "boom" })}\n\n`);
 });

 test("passes a non-SSE response body through untouched", async () => {
@HweinstockHweinstockAug 26, 2026

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i like how readable these tests are.
 const { url } = await inspectorFor(() => ({
 status: 200,
 headers: { "Content-Type": "application/json" },
 body: JSON.stringify({ answer: 42 }),
 }));
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("application/json");
 expect(await response.json()).toEqual({ answer: 42 });
 });

 test("echoes one session id and forwards it to the agent", async () => {
 let received: string | undefined;
 const { url } = await inspectorFor((request) => {
 received = request.headers["x-amzn-bedrock-agentcore-runtime-session-id"] as string;
 return { status: 200, headers: { "Content-Type": "text/event-stream" }, body: "" };
 });
 const response = await post(url, "/invocations", {
 agentName: "orders",
 prompt: "hi",
 sessionId: "session-42",
 });
 expect(response.headers.get("x-session-id")).toBe("session-42");
 expect(received).toBe("session-42");
 });
});

describe("A2A agent invocation", () => {
 test("translates the prompt to message/stream and reduces events to text frames", async () => {
 let rpcMethod: string | undefined;
 const { url } = await inspectorFor((request) => {
 rpcMethod = (JSON.parse(request.body.toString()) as { method: string }).method;
 const status = JSON.stringify({
 result: {
 kind: "status-update",
 status: { message: { parts: [{ kind: "text", text: "streamed" }] } },
 },
 });
 return {
 status: 200,
 headers: { "Content-Type": "text/event-stream" },
 body: `data: ${status}\n\n`,
 };
 }, "A2A");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(rpcMethod).toBe("message/stream");
 expect(await response.text()).toBe(`data: ${JSON.stringify("streamed")}\n\n`);
 });

 test("skips artifact text already streamed by a preceding status-update", async () => {
 const status = JSON.stringify({
 result: {
 kind: "status-update",
 status: { message: { parts: [{ kind: "text", text: "answer" }] } },
 },
 });
 const artifact = JSON.stringify({
 result: { kind: "artifact-update", artifact: { parts: [{ kind: "text", text: "answer" }] } },
 });
 const { url } = await inspectorFor(sseAgent([status, artifact]), "A2A");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe(`data: ${JSON.stringify("answer")}\n\n`);
 });

 test("falls back to extracting text from a non-streaming JSON-RPC result", async () => {
 const { url } = await inspectorFor(
 () => ({
 status: 200,
 headers: { "Content-Type": "application/json" },
 body: JSON.stringify({
 result: { artifacts: [{ parts: [{ kind: "text", text: "final" }] }] },
 }),
 }),
 "A2A",
 );
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("text/event-stream");
 expect(await response.text()).toBe(`data: ${JSON.stringify("final")}\n\n`);
 });

 test.each([
 {
 name: "an artifact-update with no preceding status-update",
 frame: JSON.stringify({
 result: { kind: "artifact-update", artifact: { parts: [{ kind: "text", text: "art" }] } },
 }),
 expected: "art",
 },
 { name: "a frame that is not JSON", frame: "not-json", expected: "not-json" },
 {
 name: "a task event carrying a status message",
 frame: JSON.stringify({
 result: {
 kind: "task",
 status: { message: { parts: [{ kind: "text", text: "task-text" }] } },
 },
 }),
 expected: "task-text",
 },
 ])("streams text extracted from $name", async ({ frame, expected }) => {
 const { url } = await inspectorFor(sseAgent([frame]), "A2A");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe(`data: ${JSON.stringify(expected)}\n\n`);
 });

 test("drops a task frame that carries no renderable parts", async () => {
 const { url } = await inspectorFor(
 sseAgent([JSON.stringify({ result: { kind: "task" } })]),
 "A2A",
 );
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe("");
 });

 test("passes a non-JSON A2A response through as plain text", async () => {
 const { url } = await inspectorFor(
 () => ({ status: 200, headers: { "Content-Type": "text/plain" }, body: "not json" }),
 "A2A",
 );
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("text/plain");
 expect(await response.text()).toBe("not json");
 });

 test("requires a prompt", async () => {
 const { url } = await inspectorFor(sseAgent([]), "A2A");
 const response = await post(url, "/invocations", { agentName: "orders" });
 expect(response.status).toBe(400);
 expect(await response.json()).toEqual({ success: false, error: "prompt is required" });
 });
});

describe("AGUI agent invocation", () => {
 test("sends a RunAgentInput body and passes the response through", async () => {
 let body: Record<string, unknown> | undefined;
 const { url } = await inspectorFor((request) => {
 body = JSON.parse(request.body.toString()) as Record<string, unknown>;
 return {
 status: 200,
 headers: { "Content-Type": "text/event-stream" },
 body: "data: passthrough\n\n",
 };
 }, "AGUI");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(body).toMatchObject({ messages: [{ role: "user", content: "hi" }] });
 expect(await response.text()).toBe("data: passthrough\n\n");
 });

 test("requires a prompt", async () => {
 const { url } = await inspectorFor(sseAgent([]), "AGUI");
 const response = await post(url, "/invocations", { agentName: "orders" });
 expect(response.status).toBe(400);
 expect(await response.json()).toEqual({ success: false, error: "prompt is required" });
 });
});
Loading
Loading

, '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); }
})();
})();

Skip to content
feat(dev): agent-proxy routes for the Agent Inspector#2085

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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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privacy statement. We’ll occasionally send you account related emails.

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Sign in
to your account

 Merged

tejaskash
merged 5 commits into

from

Aug 26, 2026
 Merged


feat(dev): agent-proxy routes for the Agent Inspector
#2085
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a068c2d

feat(dev): agent-proxy routes for the Agent Inspector


tejaskash Aug 24, 2026
41322f4

refactor(inspector): simplify agent-proxy routes


tejaskash Aug 24, 2026
d720c70

refactor(inspector): drop comments that restate the code


tejaskash Aug 26, 2026
0c0f90f

refactor(inspector): simplify A2A text extraction and invocation disp…


tejaskash Aug 26, 2026
279c0da

test(inspector): cover resource mapping and proxy error paths


tejaskash Aug 26, 2026

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254 changes: 254 additions & 0 deletions
src/core/dev/inspector/invocations.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -0,0 +1,254 @@
import { afterEach, describe, expect, test } from "bun:test";
import { type HttpRequestHandler, startHttpServer } from "../../../io/httpServer";
import { parseAgentEvent } from "./invocations";
import { ServerFarm, fakeSupervisor, post, runningAgent } from "./testkit";
import type { InspectorDeps } from "./types";

const farm = new ServerFarm();
afterEach(() => farm.close());

function sseAgent(frames: string[]): HttpRequestHandler {
 return () => ({
 status: 200,
 headers: { "Content-Type": "text/event-stream" },
 body: frames.map((frame) => `data: ${frame}\n\n`).join(""),
 });
}

async function inspectorFor(handler: HttpRequestHandler, protocol = "HTTP") {
 const agent = await farm.serve(handler);
 const supervisor = fakeSupervisor({ agents: [runningAgent("orders", agent.port, protocol)] });
 return farm.inspector({ supervisor } satisfies InspectorDeps);
}

describe("POST /invocations routing", () => {
 test("returns 409 when no agent is running", async () => {
 const { url } = await farm.inspector({ supervisor: fakeSupervisor() });
 const response = await post(url, "/invocations", { prompt: "hi" });
 expect(response.status).toBe(409);
 expect(await response.json()).toMatchObject({ success: false });
 });

 test("directs MCP agents to the dedicated proxy instead of mis-proxying them", async () => {
 const { url } = await inspectorFor(sseAgent([]), "MCP");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.status).toBe(400);
 expect(await response.json()).toEqual({
 success: false,
 error: "MCP agents are invoked through POST /api/mcp, not /invocations.",
 });
 });
});

describe("upstream connection failures", () => {
 async function deadPort(): Promise<number> {
 const handle = await startHttpServer(() => ({ status: 200 }));
 await handle.close();
 return handle.port;
 }

 test.each([
 { protocol: "HTTP", errorPrefix: "Agent server error" },
 { protocol: "A2A", errorPrefix: "A2A agent error" },
 ])("returns 502 when a $protocol agent is unreachable", async ({ protocol, errorPrefix }) => {
 const supervisor = fakeSupervisor({
 agents: [runningAgent("orders", await deadPort(), protocol)],
 });
 const { url } = await farm.inspector({ supervisor });
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.status).toBe(502);
 const body = (await response.json()) as { success: boolean; error: string };
 expect(body.success).toBe(false);
 expect(body.error).toContain(errorPrefix);
 });
});

describe("parseAgentEvent drops non-renderable frames", () => {
 test.each([
 { name: "a JSON primitive that is not text", data: JSON.stringify(42) },
 { name: "a blank error field", data: JSON.stringify({ error: "" }) },
 { name: "a blank text field", data: JSON.stringify({ text: "" }) },
 { name: "an empty non-JSON token", data: "" },
 ])("returns null for $name", ({ data }) => {
 expect(parseAgentEvent(data)).toBeNull();
 });
});

describe("HTTP agent SSE normalization", () => {
 test.each([
 { name: "a bedrock text event", frame: JSON.stringify({ text: "hello" }), expected: "hello" },
 { name: "a bare JSON string token", frame: JSON.stringify("world"), expected: "world" },
 {
 name: "a ConverseStream content delta",
 frame: JSON.stringify({ event: { contentBlockDelta: { delta: { text: "delta" } } } }),
 expected: "delta",
 },
 { name: "a non-JSON plain-text token", frame: "raw-token", expected: "raw-token" },
 ])("normalizes $name to a data frame", async ({ frame, expected }) => {
 const { url } = await inspectorFor(sseAgent([frame]));
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("text/event-stream");
 expect(await response.text()).toBe(`data: ${JSON.stringify(expected)}\n\n`);
 });

 test("re-frames an agent error event as an error payload", async () => {
 const { url } = await inspectorFor(sseAgent([JSON.stringify({ error: "boom" })]));
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe(`data: ${JSON.stringify({ error: "boom" })}\n\n`);
 });

 test("passes a non-SSE response body through untouched", async () => {
@HweinstockHweinstockAug 26, 2026

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Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

i like how readable these tests are.
 const { url } = await inspectorFor(() => ({
 status: 200,
 headers: { "Content-Type": "application/json" },
 body: JSON.stringify({ answer: 42 }),
 }));
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("application/json");
 expect(await response.json()).toEqual({ answer: 42 });
 });

 test("echoes one session id and forwards it to the agent", async () => {
 let received: string | undefined;
 const { url } = await inspectorFor((request) => {
 received = request.headers["x-amzn-bedrock-agentcore-runtime-session-id"] as string;
 return { status: 200, headers: { "Content-Type": "text/event-stream" }, body: "" };
 });
 const response = await post(url, "/invocations", {
 agentName: "orders",
 prompt: "hi",
 sessionId: "session-42",
 });
 expect(response.headers.get("x-session-id")).toBe("session-42");
 expect(received).toBe("session-42");
 });
});

describe("A2A agent invocation", () => {
 test("translates the prompt to message/stream and reduces events to text frames", async () => {
 let rpcMethod: string | undefined;
 const { url } = await inspectorFor((request) => {
 rpcMethod = (JSON.parse(request.body.toString()) as { method: string }).method;
 const status = JSON.stringify({
 result: {
 kind: "status-update",
 status: { message: { parts: [{ kind: "text", text: "streamed" }] } },
 },
 });
 return {
 status: 200,
 headers: { "Content-Type": "text/event-stream" },
 body: `data: ${status}\n\n`,
 };
 }, "A2A");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(rpcMethod).toBe("message/stream");
 expect(await response.text()).toBe(`data: ${JSON.stringify("streamed")}\n\n`);
 });

 test("skips artifact text already streamed by a preceding status-update", async () => {
 const status = JSON.stringify({
 result: {
 kind: "status-update",
 status: { message: { parts: [{ kind: "text", text: "answer" }] } },
 },
 });
 const artifact = JSON.stringify({
 result: { kind: "artifact-update", artifact: { parts: [{ kind: "text", text: "answer" }] } },
 });
 const { url } = await inspectorFor(sseAgent([status, artifact]), "A2A");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe(`data: ${JSON.stringify("answer")}\n\n`);
 });

 test("falls back to extracting text from a non-streaming JSON-RPC result", async () => {
 const { url } = await inspectorFor(
 () => ({
 status: 200,
 headers: { "Content-Type": "application/json" },
 body: JSON.stringify({
 result: { artifacts: [{ parts: [{ kind: "text", text: "final" }] }] },
 }),
 }),
 "A2A",
 );
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("text/event-stream");
 expect(await response.text()).toBe(`data: ${JSON.stringify("final")}\n\n`);
 });

 test.each([
 {
 name: "an artifact-update with no preceding status-update",
 frame: JSON.stringify({
 result: { kind: "artifact-update", artifact: { parts: [{ kind: "text", text: "art" }] } },
 }),
 expected: "art",
 },
 { name: "a frame that is not JSON", frame: "not-json", expected: "not-json" },
 {
 name: "a task event carrying a status message",
 frame: JSON.stringify({
 result: {
 kind: "task",
 status: { message: { parts: [{ kind: "text", text: "task-text" }] } },
 },
 }),
 expected: "task-text",
 },
 ])("streams text extracted from $name", async ({ frame, expected }) => {
 const { url } = await inspectorFor(sseAgent([frame]), "A2A");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe(`data: ${JSON.stringify(expected)}\n\n`);
 });

 test("drops a task frame that carries no renderable parts", async () => {
 const { url } = await inspectorFor(
 sseAgent([JSON.stringify({ result: { kind: "task" } })]),
 "A2A",
 );
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(await response.text()).toBe("");
 });

 test("passes a non-JSON A2A response through as plain text", async () => {
 const { url } = await inspectorFor(
 () => ({ status: 200, headers: { "Content-Type": "text/plain" }, body: "not json" }),
 "A2A",
 );
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(response.headers.get("content-type")).toContain("text/plain");
 expect(await response.text()).toBe("not json");
 });

 test("requires a prompt", async () => {
 const { url } = await inspectorFor(sseAgent([]), "A2A");
 const response = await post(url, "/invocations", { agentName: "orders" });
 expect(response.status).toBe(400);
 expect(await response.json()).toEqual({ success: false, error: "prompt is required" });
 });
});

describe("AGUI agent invocation", () => {
 test("sends a RunAgentInput body and passes the response through", async () => {
 let body: Record<string, unknown> | undefined;
 const { url } = await inspectorFor((request) => {
 body = JSON.parse(request.body.toString()) as Record<string, unknown>;
 return {
 status: 200,
 headers: { "Content-Type": "text/event-stream" },
 body: "data: passthrough\n\n",
 };
 }, "AGUI");
 const response = await post(url, "/invocations", { agentName: "orders", prompt: "hi" });
 expect(body).toMatchObject({ messages: [{ role: "user", content: "hi" }] });
 expect(await response.text()).toBe("data: passthrough\n\n");
 });

 test("requires a prompt", async () => {
 const { url } = await inspectorFor(sseAgent([]), "AGUI");
 const response = await post(url, "/invocations", { agentName: "orders" });
 expect(response.status).toBe(400);
 expect(await response.json()).toEqual({ success: false, error: "prompt is required" });
 });
});
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