feat(protocol): add step-level timing (startedAtMs / completedAtMs) (#489)

BREAKING CHANGE: StepRecord now requires startedAtMs and completedAtMs fields.
StepEntry now requires durationMs field. Old CAS data without these fields is invalid.

- Add startedAtMs/completedAtMs to StepRecord and StepNodePayload
- Add durationMs to StepEntry (computed: completedAtMs - startedAtMs)
- Update STEP_NODE_SCHEMA to require timing fields as integers
- Record Date.now() before/after agent execution in createAgent
- Show duration in thread read headers (formatStepHeader)
- Update existing test fixtures with timing fields

packages/cli-workflow/src/__tests__/step-read.test.ts

@@ -144,6 +144,8 @@ describe("step read", () => {
       output: outputHash,
       detail: detailHash,
       agent: "uwf-test",
+      startedAtMs: 1000000000000,
+      completedAtMs: 1000000005000,
     });
 
     // Read step with large quota
@@ -227,6 +229,8 @@ describe("step read", () => {
       output: outputHash,
       detail: detailHash,
       agent: "uwf-test",
+      startedAtMs: 1000000000000,
+      completedAtMs: 1000000005000,
     });
 
     // Read step with limited quota (700 chars)
@@ -304,6 +308,8 @@ describe("step read", () => {
       output: outputHash,
       detail: detailHash,
       agent: "uwf-test",
+      startedAtMs: 1000000000000,
+      completedAtMs: 1000000005000,
     });
 
     // Read step with minimal quota (1 char)
@@ -357,6 +363,8 @@ describe("step read", () => {
       output: outputHash,
       detail: null,
       agent: "uwf-test",
+      startedAtMs: 1000000000000,
+      completedAtMs: 1000000005000,
     });
 
     // Read step - should return metadata only (no error)
@@ -431,6 +439,8 @@ describe("step read", () => {
       output: outputHash,
       detail: detailHash,
       agent: "uwf-test",
+      startedAtMs: 1000000000000,
+      completedAtMs: 1000000005000,
     });
 
     // Read step - should return metadata only (no error)
@@ -505,6 +515,8 @@ describe("step read", () => {
       output: outputHash,
       detail: detailHash,
       agent: "uwf-test",
+      startedAtMs: 1000000000000,
+      completedAtMs: 1000000005000,
     });
 
     // Read step

packages/cli-workflow/src/__tests__/step-timing.test.ts

@@ -0,0 +1,378 @@
+import { mkdir, mkdtemp, rm } from "node:fs/promises";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { bootstrap, putSchema } from "@uncaged/json-cas";
+import { createFsStore } from "@uncaged/json-cas-fs";
+import type { CasRef, ThreadId } from "@uncaged/workflow-protocol";
+import { STEP_NODE_SCHEMA } from "@uncaged/workflow-protocol";
+import { afterEach, beforeEach, describe, expect, test } from "vitest";
+import { cmdStepList } from "../commands/step.js";
+import { cmdThreadRead } from "../commands/thread.js";
+import { registerUwfSchemas } from "../schemas.js";
+import { saveThreadsIndex } from "../store.js";
+
+// ── schemas ──────────────────────────────────────────────────────────────────
+
+const TURN_SCHEMA = {
+  title: "hermes-turn",
+  type: "object" as const,
+  required: ["index", "role", "content"],
+  properties: {
+    index: { type: "integer" as const },
+    role: { type: "string" as const },
+    content: { type: "string" as const },
+    toolCalls: {
+      anyOf: [
+        { type: "array" as const, items: { type: "object" as const } },
+        { type: "null" as const },
+      ],
+    },
+    reasoning: { anyOf: [{ type: "string" as const }, { type: "null" as const }] },
+  },
+  additionalProperties: false,
+};
+
+const DETAIL_SCHEMA = {
+  title: "hermes-detail",
+  type: "object" as const,
+  required: ["sessionId", "model", "duration", "turnCount", "turns"],
+  properties: {
+    sessionId: { type: "string" as const },
+    model: { type: "string" as const },
+    duration: { type: "integer" as const },
+    turnCount: { type: "integer" as const },
+    turns: {
+      type: "array" as const,
+      items: { type: "string" as const, format: "cas_ref" },
+    },
+  },
+  additionalProperties: false,
+};
+
+// ── helpers ──────────────────────────────────────────────────────────────────
+
+async function registerDetailSchemas(store: ReturnType<typeof createFsStore>) {
+  await bootstrap(store);
+  const [turn, detail] = await Promise.all([
+    putSchema(store, TURN_SCHEMA),
+    putSchema(store, DETAIL_SCHEMA),
+  ]);
+  return { turn, detail };
+}
+
+// ── fixture ──────────────────────────────────────────────────────────────────
+
+let tmpDir: string;
+
+beforeEach(async () => {
+  tmpDir = await mkdtemp(join(tmpdir(), "cli-uwf-step-timing-test-"));
+});
+
+afterEach(async () => {
+  await rm(tmpDir, { recursive: true, force: true });
+});
+
+// ── 1. Protocol types (compile-time) ─────────────────────────────────────────
+
+describe("protocol types", () => {
+  test("StepRecord has startedAtMs and completedAtMs as required fields", () => {
+    // Type-level test: this block compiles only if fields exist and are number
+    const record: import("@uncaged/workflow-protocol").StepRecord = {
+      role: "test",
+      output: "hash1" as CasRef,
+      detail: "hash2" as CasRef,
+      agent: "uwf-test",
+      edgePrompt: "",
+      startedAtMs: 1000,
+      completedAtMs: 2000,
+    };
+    expect(record.startedAtMs).toBe(1000);
+    expect(record.completedAtMs).toBe(2000);
+  });
+
+  test("StepEntry has durationMs as required field", () => {
+    const entry: import("@uncaged/workflow-protocol").StepEntry = {
+      hash: "hash" as CasRef,
+      role: "test",
+      output: {},
+      detail: "hash2" as CasRef,
+      agent: "uwf-test",
+      timestamp: 123,
+      durationMs: 5000,
+    };
+    expect(entry.durationMs).toBe(5000);
+  });
+});
+
+// ── 2. JSON Schema ───────────────────────────────────────────────────────────
+
+describe("StepNode JSON schema", () => {
+  test("schema requires startedAtMs and completedAtMs", () => {
+    const required = STEP_NODE_SCHEMA.required as string[];
+    expect(required).toContain("startedAtMs");
+    expect(required).toContain("completedAtMs");
+  });
+
+  test("schema defines timing fields as integer", () => {
+    const props = STEP_NODE_SCHEMA.properties as Record<string, { type: string }>;
+    expect(props.startedAtMs.type).toBe("integer");
+    expect(props.completedAtMs.type).toBe("integer");
+  });
+
+  test("StepNode with timing fields passes CAS validation", async () => {
+    const casDir = join(tmpDir, "cas");
+    await mkdir(casDir, { recursive: true });
+    const store = createFsStore(casDir);
+    const schemas = await registerUwfSchemas(store);
+
+    const startHash = await store.put(schemas.startNode, {
+      workflow: "placeholder0000" as CasRef,
+      prompt: "test",
+    });
+
+    const outputHash = await store.put(schemas.text, "output text");
+
+    const detailSchemas = await registerDetailSchemas(store);
+    const detailHash = await store.put(detailSchemas.detail, {
+      sessionId: "s1",
+      model: "m1",
+      duration: 100,
+      turnCount: 0,
+      turns: [],
+    });
+
+    // Should succeed — valid timing fields
+    const hash = await store.put(schemas.stepNode, {
+      start: startHash,
+      prev: null,
+      role: "worker",
+      output: outputHash,
+      detail: detailHash,
+      agent: "uwf-test",
+      edgePrompt: "",
+      startedAtMs: 1000000000000,
+      completedAtMs: 1000000005000,
+    });
+    expect(hash).toBeTruthy();
+  });
+});
+
+// ── 3. step list — durationMs computed ───────────────────────────────────────
+
+describe("step list timing", () => {
+  test("step list includes durationMs = completedAtMs - startedAtMs", async () => {
+    const casDir = join(tmpDir, "cas");
+    await mkdir(casDir, { recursive: true });
+    const store = createFsStore(casDir);
+    const schemas = await registerUwfSchemas(store);
+    const detailSchemas = await registerDetailSchemas(store);
+
+    const workflowHash = await store.put(schemas.workflow, {
+      name: "test-wf",
+      description: "desc",
+      roles: {},
+      graph: {},
+    });
+
+    const startHash = await store.put(schemas.startNode, {
+      workflow: workflowHash,
+      prompt: "test",
+    });
+
+    const outputHash = await store.put(schemas.text, "output");
+    const detailHash = await store.put(detailSchemas.detail, {
+      sessionId: "s1",
+      model: "m1",
+      duration: 100,
+      turnCount: 0,
+      turns: [],
+    });
+
+    const startedAt = 1716600000000;
+    const completedAt = 1716600003500;
+
+    const stepHash = await store.put(schemas.stepNode, {
+      start: startHash,
+      prev: null,
+      role: "worker",
+      output: outputHash,
+      detail: detailHash,
+      agent: "uwf-test",
+      edgePrompt: "",
+      startedAtMs: startedAt,
+      completedAtMs: completedAt,
+    });
+
+    const threadId = "01HX2Q3R4S5T6V7W8X9YZ1" as ThreadId;
+    await saveThreadsIndex(tmpDir, { [threadId]: stepHash });
+
+    const result = await cmdStepList(tmpDir, threadId);
+    const stepEntries = result.steps.slice(1); // skip start entry
+    expect(stepEntries).toHaveLength(1);
+
+    const step = stepEntries[0] as import("@uncaged/workflow-protocol").StepEntry;
+    expect(step.durationMs).toBe(3500);
+  });
+});
+
+// ── 4. thread read — duration in header ──────────────────────────────────────
+
+describe("thread read timing", () => {
+  test("thread read header includes Duration", async () => {
+    const casDir = join(tmpDir, "cas");
+    await mkdir(casDir, { recursive: true });
+    const store = createFsStore(casDir);
+    const schemas = await registerUwfSchemas(store);
+    const detailSchemas = await registerDetailSchemas(store);
+
+    const workflowHash = await store.put(schemas.workflow, {
+      name: "test-wf",
+      description: "desc",
+      roles: {
+        worker: {
+          description: "Worker",
+          goal: "Do work",
+          capabilities: [],
+          procedure: "work",
+          output: "result",
+          frontmatter: "placeholder0000" as CasRef,
+        },
+      },
+      graph: {
+        $START: { _: { role: "worker", prompt: "go" } },
+        worker: { _: { role: "$END", prompt: "" } },
+      },
+    });
+
+    const startHash = await store.put(schemas.startNode, {
+      workflow: workflowHash,
+      prompt: "test task",
+    });
+
+    const turnHash = await store.put(detailSchemas.turn, {
+      index: 0,
+      role: "assistant",
+      content: "Done.",
+      toolCalls: null,
+      reasoning: null,
+    });
+    const detailHash = await store.put(detailSchemas.detail, {
+      sessionId: "s1",
+      model: "m1",
+      duration: 100,
+      turnCount: 1,
+      turns: [turnHash],
+    });
+    const outputHash = await store.put(schemas.text, "output");
+
+    const stepHash = await store.put(schemas.stepNode, {
+      start: startHash,
+      prev: null,
+      role: "worker",
+      output: outputHash,
+      detail: detailHash,
+      agent: "uwf-test",
+      edgePrompt: "",
+      startedAtMs: 1716600000000,
+      completedAtMs: 1716600042000,
+    });
+
+    const threadId = "01HX2Q3R4S5T6V7W8X9YZ3" as ThreadId;
+    await saveThreadsIndex(tmpDir, { [threadId]: stepHash });
+
+    const markdown = await cmdThreadRead(tmpDir, threadId, 10000, null, false);
+    expect(markdown).toContain("**Duration:** 42.0s");
+  });
+
+  test("thread read shows sub-second duration as ms", async () => {
+    const casDir = join(tmpDir, "cas");
+    await mkdir(casDir, { recursive: true });
+    const store = createFsStore(casDir);
+    const schemas = await registerUwfSchemas(store);
+    const detailSchemas = await registerDetailSchemas(store);
+
+    const workflowHash = await store.put(schemas.workflow, {
+      name: "test-wf",
+      description: "desc",
+      roles: {
+        worker: {
+          description: "Worker",
+          goal: "Do work",
+          capabilities: [],
+          procedure: "work",
+          output: "result",
+          frontmatter: "placeholder0000" as CasRef,
+        },
+      },
+      graph: {
+        $START: { _: { role: "worker", prompt: "go" } },
+        worker: { _: { role: "$END", prompt: "" } },
+      },
+    });
+
+    const startHash = await store.put(schemas.startNode, {
+      workflow: workflowHash,
+      prompt: "test",
+    });
+
+    const turnHash = await store.put(detailSchemas.turn, {
+      index: 0,
+      role: "assistant",
+      content: "Done.",
+      toolCalls: null,
+      reasoning: null,
+    });
+    const detailHash = await store.put(detailSchemas.detail, {
+      sessionId: "s1",
+      model: "m1",
+      duration: 100,
+      turnCount: 1,
+      turns: [turnHash],
+    });
+    const outputHash = await store.put(schemas.text, "output");
+
+    const stepHash = await store.put(schemas.stepNode, {
+      start: startHash,
+      prev: null,
+      role: "worker",
+      output: outputHash,
+      detail: detailHash,
+      agent: "uwf-test",
+      edgePrompt: "",
+      startedAtMs: 1716600000000,
+      completedAtMs: 1716600000350,
+    });
+
+    const threadId = "01HX2Q3R4S5T6V7W8X9YZ4" as ThreadId;
+    await saveThreadsIndex(tmpDir, { [threadId]: stepHash });
+
+    const markdown = await cmdThreadRead(tmpDir, threadId, 10000, null, false);
+    expect(markdown).toContain("**Duration:** 350ms");
+  });
+});
+
+// ── 6. Breaking change — old data without timing fails ───────────────────────
+
+describe("breaking change", () => {
+  test("StepNode schema rejects payload without timing fields", () => {
+    const required = STEP_NODE_SCHEMA.required as string[];
+    // Both fields must be in the required array
+    expect(required).toContain("startedAtMs");
+    expect(required).toContain("completedAtMs");
+
+    // Payload without timing fields would fail schema validation
+    // because the schema marks them as required
+    const payloadWithoutTiming = {
+      start: "hash1",
+      prev: null,
+      role: "worker",
+      output: "hash2",
+      detail: "hash3",
+      agent: "uwf-test",
+      edgePrompt: "",
+    };
+    // Verify the payload is missing required fields
+    expect(payloadWithoutTiming).not.toHaveProperty("startedAtMs");
+    expect(payloadWithoutTiming).not.toHaveProperty("completedAtMs");
+  });
+});

packages/cli-workflow/src/__tests__/thread-read-quota.test.ts

@@ -141,6 +141,8 @@ describe("thread read --quota flag", () => {
         output: outputHash,
         detail: detailHash,
         agent: "uwf-test",
+        startedAtMs: 1000000000000,
+        completedAtMs: 1000000005000,
       });
       steps.push(stepHash);
     }
@@ -221,6 +223,8 @@ describe("thread read --quota flag", () => {
       output: outputHash,
       detail: step1DetailHash,
       agent: "uwf-test",
+      startedAtMs: 1000000000000,
+      completedAtMs: 1000000005000,
     });
 
     const step2Content = generateContent(600, "Second");
@@ -245,6 +249,8 @@ describe("thread read --quota flag", () => {
       output: outputHash,
       detail: step2DetailHash,
       agent: "uwf-test",
+      startedAtMs: 1000000000000,
+      completedAtMs: 1000000005000,
     });
 
     const threadId = "01HX2Q3R4S5T6V7W8X9YZ1" as ThreadId;
@@ -328,6 +334,8 @@ describe("thread read --quota flag", () => {
         output: outputHash,
         detail: detailHash,
         agent: "uwf-test",
+        startedAtMs: 1000000000000,
+        completedAtMs: 1000000005000,
       });
       steps.push(stepHash);
     }
@@ -338,8 +346,8 @@ describe("thread read --quota flag", () => {
     // Set tight quota with --start flag
     const markdown = await cmdThreadRead(tmpDir, threadId, 600, null, true);
 
-    // Quota must be reasonably enforced (allow ~210 char tolerance for structure)
-    expect(markdown.length).toBeLessThanOrEqual(810);
+    // Quota must be reasonably enforced (allow ~260 char tolerance for structure)
+    expect(markdown.length).toBeLessThanOrEqual(860);
 
     // Should contain thread header
     expect(markdown).toMatch(/# Thread/);
@@ -405,6 +413,8 @@ describe("thread read --quota flag", () => {
       output: outputHash,
       detail: detailHash,
       agent: "uwf-test",
+      startedAtMs: 1000000000000,
+      completedAtMs: 1000000005000,
     });
 
     const threadId = "01HX2Q3R4S5T6V7W8X9YZ4" as ThreadId;
@@ -480,6 +490,8 @@ describe("thread read --quota flag", () => {
         output: outputHash,
         detail: detailHash,
         agent: "uwf-test",
+        startedAtMs: 1000000000000,
+        completedAtMs: 1000000005000,
       });
       steps.push(stepHash);
     }
@@ -559,6 +571,8 @@ describe("thread read --quota flag", () => {
         output: outputHash,
         detail: detailHash,
         agent: "uwf-test",
+        startedAtMs: 1000000000000,
+        completedAtMs: 1000000005000,
       });
       steps.push(stepHash);
     }

packages/cli-workflow/src/__tests__/thread-read-xml-tags.test.ts

@@ -139,6 +139,8 @@ describe("thread read XML tag isolation", () => {
       output: outputHash,
       detail: detailHash,
       agent: "uwf-claude-code",
+      startedAtMs: 1000000000000,
+      completedAtMs: 1000000005000,
     });
 
     const threadId = "01JTEST0000000000000001" as ThreadId;
@@ -214,6 +216,8 @@ describe("thread read XML tag isolation", () => {
       output: outputHash,
       detail: detailHash,
       agent: "uwf-claude-code",
+      startedAtMs: 1000000000000,
+      completedAtMs: 1000000005000,
     });
 
     const threadId = "01JTEST0000000000000002" as ThreadId;
@@ -274,6 +278,8 @@ describe("thread read XML tag isolation", () => {
       output: outputHash,
       detail: null,
       agent: "uwf-test",
+      startedAtMs: 1000000000000,
+      completedAtMs: 1000000005000,
     });
 
     const step2 = await uwf.store.put(uwf.schemas.stepNode, {
@@ -283,6 +289,8 @@ describe("thread read XML tag isolation", () => {
       output: outputHash,
       detail: null,
       agent: "uwf-test",
+      startedAtMs: 1000000000000,
+      completedAtMs: 1000000005000,
     });
 
     const threadId = "01JTEST0000000000000003" as ThreadId;
@@ -335,6 +343,8 @@ describe("thread read XML tag isolation", () => {
       output: outputHash,
       detail: null,
       agent: "uwf-test",
+      startedAtMs: 1000000000000,
+      completedAtMs: 1000000005000,
     });
 
     const threadId = "01JTEST0000000000000004" as ThreadId;
@@ -387,6 +397,8 @@ describe("thread read XML tag isolation", () => {
       output: outputHash,
       detail: missingDetailRef,
       agent: "uwf-test",
+      startedAtMs: 1000000000000,
+      completedAtMs: 1000000005000,
     });
 
     const threadId = "01JTEST0000000000000005" as ThreadId;
@@ -439,6 +451,8 @@ describe("thread read XML tag isolation", () => {
       output: outputHash,
       detail: null,
       agent: "uwf-test",
+      startedAtMs: 1000000000000,
+      completedAtMs: 1000000005000,
     });
 
     const threadId = "01JTEST0000000000000006" as ThreadId;
@@ -511,6 +525,8 @@ describe("thread read XML tag isolation", () => {
       output: outputHash,
       detail: null,
       agent: "uwf-test",
+      startedAtMs: 1000000000000,
+      completedAtMs: 1000000005000,
     });
 
     const step2 = await uwf.store.put(uwf.schemas.stepNode, {
@@ -520,6 +536,8 @@ describe("thread read XML tag isolation", () => {
       output: outputHash,
       detail: null,
       agent: "uwf-test",
+      startedAtMs: 1000000000000,
+      completedAtMs: 1000000005000,
     });
 
     const step3 = await uwf.store.put(uwf.schemas.stepNode, {
@@ -529,6 +547,8 @@ describe("thread read XML tag isolation", () => {
       output: outputHash,
       detail: null,
       agent: "uwf-test",
+      startedAtMs: 1000000000000,
+      completedAtMs: 1000000005000,
     });
 
     const threadId = "01JTEST0000000000000007" as ThreadId;
@@ -607,6 +627,8 @@ describe("thread read XML tag isolation", () => {
       output: outputHash,
       detail: detailHash,
       agent: "uwf-test",
+      startedAtMs: 1000000000000,
+      completedAtMs: 1000000005000,
     });
 
     const threadId = "01JTEST0000000000000008" as ThreadId;
@@ -661,6 +683,8 @@ describe("thread read XML tag isolation", () => {
         output: outputHash,
         detail: null,
         agent: "uwf-test",
+        startedAtMs: 1000000000000,
+        completedAtMs: 1000000005000,
       })) as CasRef;
       steps.push(step);
       prev = step;

packages/cli-workflow/src/commands/step.ts

@@ -58,6 +58,7 @@ export async function cmdStepList(
       detail: item.payload.detail ?? null,
       agent: item.payload.agent,
       timestamp: item.timestamp,
+      durationMs: item.payload.completedAtMs - item.payload.startedAtMs,
     });
   }
 

packages/cli-workflow/src/commands/thread.ts

@@ -566,14 +566,25 @@ function selectByQuota(
   return { selected, skippedCount: candidates.length - selected.length };
 }
 
+function formatDuration(ms: number): string {
+  if (ms < 1000) return `${ms}ms`;
+  const seconds = ms / 1000;
+  if (seconds < 60) return `${seconds.toFixed(1)}s`;
+  const minutes = Math.floor(seconds / 60);
+  const remainingSec = Math.round(seconds % 60);
+  return `${minutes}m${remainingSec}s`;
+}
+
 function formatStepHeader(stepNum: number, item: OrderedStepItem): string {
   const ts = new Date(item.timestamp)
     .toISOString()
     .replace("T", " ")
     .replace(/\.\d+Z$/, "");
+  const durationMs = item.payload.completedAtMs - item.payload.startedAtMs;
+  const duration = formatDuration(durationMs);
   return [
     `## Step ${stepNum}: ${item.payload.role} \`${item.hash}\``,
-    `**Agent:** ${item.payload.agent} | **Time:** ${ts}`,
+    `**Agent:** ${item.payload.agent} | **Time:** ${ts} | **Duration:** ${duration}`,
   ].join("\n");
 }
 

packages/workflow-agent-kit/src/context.ts

@@ -128,6 +128,8 @@ async function buildHistory(
       detail: step.detail,
       agent: step.agent,
       edgePrompt: step.edgePrompt ?? "",
+      startedAtMs: step.startedAtMs,
+      completedAtMs: step.completedAtMs,
       content,
     });
   }

packages/workflow-agent-kit/src/run.ts

@@ -59,6 +59,8 @@ async function writeStepNode(options: {
   detailHash: CasRef;
   agentName: string;
   edgePrompt: string;
+  startedAtMs: number;
+  completedAtMs: number;
 }): Promise<CasRef> {
   const payload: StepNodePayload = {
     start: options.startHash,
@@ -68,6 +70,8 @@ async function writeStepNode(options: {
     detail: options.detailHash,
     agent: options.agentName,
     edgePrompt: options.edgePrompt,
+    startedAtMs: options.startedAtMs,
+    completedAtMs: options.completedAtMs,
   };
   const hash = await options.store.put(options.schemas.stepNode, payload);
   const node = options.store.get(hash);
@@ -94,6 +98,8 @@ async function persistStep(options: {
   outputHash: CasRef;
   detailHash: CasRef;
   agentName: string;
+  startedAtMs: number;
+  completedAtMs: number;
 }): Promise<CasRef> {
   const { store, schemas, chain, headHash } = options.ctx.meta;
   return writeStepNode({
@@ -106,6 +112,8 @@ async function persistStep(options: {
     detailHash: options.detailHash,
     agentName: options.agentName,
     edgePrompt: options.ctx.edgePrompt,
+    startedAtMs: options.startedAtMs,
+    completedAtMs: options.completedAtMs,
   });
 }
 
@@ -127,6 +135,7 @@ export function createAgent(options: AgentOptions): () => Promise<void> {
       ctx.outputFormatInstruction = buildOutputFormatInstruction(frontmatterSchema);
     }
 
+    const startedAtMs = Date.now();
     let agentResult = await runWithMessage("agent run failed", () => options.run(ctx));
 
     // Preserve the primary detail from the first run — it contains the full
@@ -156,12 +165,14 @@ export function createAgent(options: AgentOptions): () => Promise<void> {
           `Raw output (first 500 chars): ${agentResult.output.slice(0, 500)}`,
       );
     }
-
+    const completedAtMs = Date.now();
     const stepHash = await persistStep({
       ctx,
       outputHash,
       detailHash: primaryDetailHash,
       agentName: agentLabel(options.name),
+      startedAtMs,
+      completedAtMs,
     });
 
     process.stdout.write(`${stepHash}\n`);

packages/workflow-protocol/src/schemas.ts

@@ -60,7 +60,7 @@ export const START_NODE_SCHEMA: JSONSchema = {
 export const STEP_NODE_SCHEMA: JSONSchema = {
   title: "StepNode",
   type: "object",
-  required: ["start", "prev", "role", "output", "detail", "agent"],
+  required: ["start", "prev", "role", "output", "detail", "agent", "startedAtMs", "completedAtMs"],
   properties: {
     start: { type: "string", format: "cas_ref" },
     prev: {
@@ -71,6 +71,8 @@ export const STEP_NODE_SCHEMA: JSONSchema = {
     detail: { type: "string", format: "cas_ref" },
     agent: { type: "string" },
     edgePrompt: { type: "string" },
+    startedAtMs: { type: "integer" },
+    completedAtMs: { type: "integer" },
   },
   additionalProperties: false,
 };

packages/workflow-protocol/src/types.ts

@@ -14,6 +14,10 @@ export type StepRecord = {
   agent: string;
   /** Moderator edge prompt that led to this step. Missing in legacy nodes → "". */
   edgePrompt: string;
+  /** Date.now() before agent spawn */
+  startedAtMs: number;
+  /** Date.now() after agent returns */
+  completedAtMs: number;
 };
 
 // ── 4.2 Workflow 定义 ───────────────────────────────────────────────
@@ -89,6 +93,7 @@ export type StepEntry = {
   detail: CasRef;
   agent: string;
   timestamp: number;
+  durationMs: number;
 };
 
 /** uwf thread steps — start entry */