feat: engine injects extract provider at runtime (Phase 2)

- createWorkflow(def, binding) — no more extract/llmProvider params
- Engine resolves extract provider from workflow.yaml via resolveModel
- WorkflowFnOptions now carries extract + llmProvider (engine-injected)
- Delete extract-provider.ts, inline maxDepth helper
- Template packages simplified: only take agent binding
- Breaking change: bundles no longer carry provider config

Refs #110

examples/hello-world.ts

@@ -1,4 +1,4 @@
-import { createExtract, createWorkflow, END, type RoleDefinition } from "@uncaged/workflow";
+import { createWorkflow, END, type RoleDefinition } from "@uncaged/workflow";
 import * as z from "zod/v4";
 
 type Roles = {
@@ -32,12 +32,6 @@ const greeter: RoleDefinition<Roles["greeter"]> = {
   extractMode: "single",
 };
 
-const extract = createExtract({
-  baseUrl: "http://127.0.0.1:9",
-  apiKey: "",
-  model: "",
-});
-
 export const run = createWorkflow<Roles>(
   {
     roles: { greeter },
@@ -48,6 +42,4 @@ export const run = createWorkflow<Roles>(
   {
     agent: async (ctx) => `Hello, ${ctx.start.content}`,
   },
-  extract,
-  null,
 );

packages/cli-workflow/__tests__/fork-cli.test.ts

@@ -7,6 +7,7 @@ import { cmdFork, cmdRun } from "../src/commands/thread/index.js";
 import { cmdAdd } from "../src/commands/workflow/index.js";
 import { pathExists } from "../src/fs-utils.js";
 import { addCliArgs } from "./bundle-fixture.js";
+import { ensureTestWorkflowRegistryConfig } from "./workflow-registry-fixture.js";
 
 /** Three-role workflow that respects `input.steps` for fork/resume. */
 const threeRoleBundleSource = `import { putContentMerkleNode } from "@uncaged/workflow";
@@ -77,6 +78,7 @@ describe("cli fork", () => {
     prevEnv = process.env.UNCAGED_WORKFLOW_STORAGE_ROOT;
     storageRoot = await mkdtemp(join(tmpdir(), "uncaged-wf-fork-"));
     process.env.UNCAGED_WORKFLOW_STORAGE_ROOT = storageRoot;
+    await ensureTestWorkflowRegistryConfig(storageRoot);
   });
 
   afterEach(async () => {

packages/cli-workflow/__tests__/thread-cli.test.ts

@@ -19,6 +19,7 @@ import {
 import { cmdAdd } from "../src/commands/workflow/index.js";
 import { pathExists, readTextFileIfExists } from "../src/fs-utils.js";
 import { addCliArgs } from "./bundle-fixture.js";
+import { ensureTestWorkflowRegistryConfig } from "./workflow-registry-fixture.js";
 
 const wfPutImport = `import { putContentMerkleNode } from "@uncaged/workflow";
 `;
@@ -142,6 +143,7 @@ describe("cli thread commands", () => {
     prevEnv = process.env.UNCAGED_WORKFLOW_STORAGE_ROOT;
     storageRoot = await mkdtemp(join(tmpdir(), "uncaged-wf-thread-"));
     process.env.UNCAGED_WORKFLOW_STORAGE_ROOT = storageRoot;
+    await ensureTestWorkflowRegistryConfig(storageRoot);
   });
 
   afterEach(async () => {

packages/cli-workflow/__tests__/workflow-registry-fixture.ts

@@ -0,0 +1,18 @@
+import { writeFile } from "node:fs/promises";
+import { join } from "node:path";
+
+/** Minimal valid global config so {@link executeThread} can resolve the extract scene (CLI integration tests). */
+export const TEST_WORKFLOW_REGISTRY_YAML = `config:
+  maxDepth: 3
+  providers:
+    stub:
+      baseUrl: http://127.0.0.1:9
+      apiKey: test
+  models:
+    default: stub/m
+workflows: {}
+`;
+
+export async function ensureTestWorkflowRegistryConfig(storageRoot: string): Promise<void> {
+  await writeFile(join(storageRoot, "workflow.yaml"), TEST_WORKFLOW_REGISTRY_YAML, "utf8");
+}

packages/cli-workflow/src/commands/init/workspace.ts

@@ -107,7 +107,7 @@ Init 生成的骨架：\`templates/\` 下放可复用定义，\`workflows/\` 下
 2. **编写 RoleDefinition**：为每个角色写 Zod \`schema\`，补齐 \`systemPrompt\` / \`extractPrompt\` / \`description\`。
 3. **编写 Moderator**：根据 \`ctx.steps\` 与业务状态返回下一个角色名或 \`END\`。
 4. **组装 WorkflowDefinition**：在模板 \`index\` 中导出 definition（以及必要的角色 / moderator 导出）。
-5. **实例化**：在 workflow 包中使用 \`createWorkflow(def, binding, extract)\`（或项目约定的封装）绑定 **AgentFn** / **ExtractFn**。
+5. **实例化**：在 workflow 包中使用 \`createWorkflow(def, binding)\`（或项目约定的封装）绑定 **AgentFn**；**ExtractFn** 由引擎从 **workflow.yaml** 注入 \`WorkflowFnOptions\`。
 6. **构建**：打包为单个 **.esm.js** bundle，使用 **uncaged-workflow add** 注册。
 
 ## 4. 编码规范

packages/workflow-template-develop/src/index.ts

@@ -1,8 +1,6 @@
 import {
   type AgentBinding,
   createWorkflow,
-  type ExtractFn,
-  type LlmProvider,
   type WorkflowDefinition,
   type WorkflowFn,
 } from "@uncaged/workflow";
@@ -43,10 +41,6 @@ export const developWorkflowDefinition: WorkflowDefinition<DevelopMeta> = {
   moderator: developModerator,
 };
 
-export function createDevelopRun(
+export function createDevelopRun(binding: AgentBinding): WorkflowFn {
-  binding: AgentBinding,
+  return createWorkflow(developWorkflowDefinition, binding);
-  extract: ExtractFn,
-  llmProvider: LlmProvider | null,
-): WorkflowFn {
-  return createWorkflow(developWorkflowDefinition, binding, extract, llmProvider);
 }

packages/workflow-template-solve-issue/__tests__/solve-issue-template.test.ts

@@ -250,17 +250,20 @@ describe("createSolveIssueRun", () => {
     const cas = createCasStore(casDir);
 
     // Override developer so the test does not spin up a child workflow.
-    const run = createSolveIssueRun(
+    const run = createSolveIssueRun({
-      {
+      agent: async () => "",
-        agent: async () => "",
+      overrides: { developer: async () => "stub-root-hash" },
-        overrides: { developer: async () => "stub-root-hash" },
+    });
-      },
-      stubExtract,
-      stubLlmProvider,
-    );
     const gen = run(
       { prompt: "task", steps: [] },
-      { threadId: "01TEST000000000000000000TR", maxRounds: 20, depth: 0, cas },
+      {
+        threadId: "01TEST000000000000000000TR",
+        maxRounds: 20,
+        depth: 0,
+        cas,
+        extract: stubExtract,
+        llmProvider: stubLlmProvider,
+      },
     );
     const first = await gen.next();
     expect(first.done).toBe(false);
@@ -294,33 +297,36 @@ describe("createSolveIssueRun", () => {
     const cas = createCasStore(casDir);
 
     const calls: string[] = [];
-    const run = createSolveIssueRun(
+    const run = createSolveIssueRun({
-      {
+      agent: async () => {
-        agent: async () => {
+        calls.push("default");
-          calls.push("default");
+        return "";
+      },
+      overrides: {
+        preparer: async () => {
+          calls.push("preparer");
           return "";
         },
-        overrides: {
+        developer: async () => {
-          preparer: async () => {
+          calls.push("developer");
-            calls.push("preparer");
+          return "stub-root-hash";
-            return "";
+        },
-          },
+        submitter: async () => {
-          developer: async () => {
+          calls.push("submitter");
-            calls.push("developer");
+          return "";
-            return "stub-root-hash";
-          },
-          submitter: async () => {
-            calls.push("submitter");
-            return "";
-          },
         },
       },
-      stubExtract,
+    });
-      stubLlmProvider,
-    );
     const gen = run(
       { prompt: "task", steps: [] },
-      { threadId: "01TEST000000000000000000TR", maxRounds: 20, depth: 0, cas },
+      {
+        threadId: "01TEST000000000000000000TR",
+        maxRounds: 20,
+        depth: 0,
+        cas,
+        extract: stubExtract,
+        llmProvider: stubLlmProvider,
+      },
     );
     await gen.next();
     expect(calls).toEqual(["preparer"]);
@@ -353,22 +359,25 @@ describe("createSolveIssueRun", () => {
     const cas = createCasStore(casDir);
 
     let developerInvocations = 0;
-    const run = createSolveIssueRun(
+    const run = createSolveIssueRun({
-      {
+      agent: async () => "",
-        agent: async () => "",
+      overrides: {
-        overrides: {
+        developer: async () => {
-          developer: async () => {
+          developerInvocations += 1;
-            developerInvocations += 1;
+          return "stub-root-hash";
-            return "stub-root-hash";
-          },
         },
       },
-      stubExtract,
+    });
-      stubLlmProvider,
-    );
     const gen = run(
       { prompt: "task", steps: [] },
-      { threadId: "01TEST000000000000000000TR", maxRounds: 20, depth: 0, cas },
+      {
+        threadId: "01TEST000000000000000000TR",
+        maxRounds: 20,
+        depth: 0,
+        cas,
+        extract: stubExtract,
+        llmProvider: stubLlmProvider,
+      },
     );
     // preparer
     await gen.next();

packages/workflow-template-solve-issue/src/index.ts

@@ -1,8 +1,6 @@
 import {
   type AgentBinding,
   createWorkflow,
-  type ExtractFn,
-  type LlmProvider,
   type WorkflowDefinition,
   type WorkflowFn,
   workflowAsAgent,
@@ -46,11 +44,7 @@ export const solveIssueWorkflowDefinition: WorkflowDefinition<SolveIssueMeta> =
  * {@link workflowAsAgent}; if the caller supplies their own `developer` override in
  * `binding.overrides`, it takes precedence so tests and custom hosts can stub it.
  */
-export function createSolveIssueRun(
+export function createSolveIssueRun(binding: AgentBinding): WorkflowFn {
-  binding: AgentBinding,
-  extract: ExtractFn,
-  llmProvider: LlmProvider | null,
-): WorkflowFn {
   const developerOverride = binding.overrides?.developer ?? workflowAsAgent("develop");
   const mergedBinding: AgentBinding = {
     agent: binding.agent,
@@ -59,5 +53,5 @@ export function createSolveIssueRun(
       developer: developerOverride,
     },
   };
-  return createWorkflow(solveIssueWorkflowDefinition, mergedBinding, extract, llmProvider);
+  return createWorkflow(solveIssueWorkflowDefinition, mergedBinding);
 }

packages/workflow/__tests__/engine.test.ts

@@ -1,5 +1,5 @@
 import { afterEach, describe, expect, test } from "bun:test";
-import { mkdir, mkdtemp, readFile, rm } from "node:fs/promises";
+import { mkdir, mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
 import * as z from "zod/v4";
@@ -13,8 +13,7 @@ import {
 } from "../src/cas/merkle.js";
 import { createWorkflow } from "../src/engine/create-workflow.js";
 import { executeThread } from "../src/engine/engine.js";
-import { createExtract } from "../src/extract/extract-fn.js";
+import { END } from "../src/types.js";
-import { END, type LlmProvider } from "../src/types.js";
 import { createLogger } from "../src/util/logger.js";
 
 const plannerMetaSchema = z.object({
@@ -82,11 +81,20 @@ function installMockChatCompletions(sequence: ReadonlyArray<Record<string, unkno
   };
 }
 
-const demoExtract = createExtract({
+const EXTRACT_REGISTRY_YAML = `config:
-  baseUrl: "http://127.0.0.1:9",
+  maxDepth: 3
-  apiKey: "test",
+  providers:
-  model: "test",
+    stub:
-});
+      baseUrl: http://127.0.0.1:9
+      apiKey: test
+  models:
+    default: stub/model
+workflows: {}
+`;
+
+async function writeExtractRegistryConfig(storageRoot: string): Promise<void> {
+  await writeFile(join(storageRoot, "workflow.yaml"), EXTRACT_REGISTRY_YAML, "utf8");
+}
 
 const demoWorkflow = createWorkflow<DemoMeta>(
   {
@@ -125,8 +133,6 @@ const demoWorkflow = createWorkflow<DemoMeta>(
       coder: async () => "code-body",
     },
   },
-  demoExtract,
-  null,
 );
 
 describe("executeThread", () => {
@@ -150,6 +156,7 @@ describe("executeThread", () => {
       const dataPath = join(root, "logs", hash, `${threadId}.data.jsonl`);
       const infoPath = join(root, "logs", hash, `${threadId}.info.jsonl`);
       await mkdir(join(root, "logs", hash), { recursive: true });
+      await writeExtractRegistryConfig(root);
       const cas = createCasStore(join(root, "cas"));
 
       const logger = createLogger({ sink: { kind: "file", path: infoPath } });
@@ -166,6 +173,7 @@ describe("executeThread", () => {
           awaitAfterEachYield: async () => {},
           forkSourceThreadId: null,
           prefilledDiskSteps: null,
+          storageRoot: root,
         },
         { threadId, hash, dataJsonlPath: dataPath, infoJsonlPath: infoPath, cas },
         logger,
@@ -258,6 +266,7 @@ describe("executeThread", () => {
       const dataPath = join(root, "logs", hash, `${threadId}.data.jsonl`);
       const infoPath = join(root, "logs", hash, `${threadId}.info.jsonl`);
       await mkdir(join(root, "logs", hash), { recursive: true });
+      await writeExtractRegistryConfig(root);
       const cas = createCasStore(join(root, "cas"));
       const plannerHash = await cas.put(serializeMerkleNode(createContentMerkleNode("plan-body")));
 
@@ -295,6 +304,7 @@ describe("executeThread", () => {
               timestamp: histTs,
             },
           ],
+          storageRoot: root,
         },
         { threadId, hash, dataJsonlPath: dataPath, infoJsonlPath: infoPath, cas },
         logger,
@@ -354,6 +364,7 @@ describe("executeThread", () => {
           awaitAfterEachYield: async () => {},
           forkSourceThreadId: null,
           prefilledDiskSteps: null,
+          storageRoot: root,
         },
         { threadId, hash, dataJsonlPath: dataPath, infoJsonlPath: infoPath, cas },
         logger,
@@ -391,6 +402,7 @@ describe("executeThread", () => {
       const dataPath = join(root, "logs", hash, `${threadId}.data.jsonl`);
       const infoPath = join(root, "logs", hash, `${threadId}.info.jsonl`);
       await mkdir(join(root, "logs", hash), { recursive: true });
+      await writeExtractRegistryConfig(root);
       const cas = createCasStore(join(root, "cas"));
 
       const logger = createLogger({ sink: { kind: "file", path: infoPath } });
@@ -407,6 +419,7 @@ describe("executeThread", () => {
           awaitAfterEachYield: async () => {},
           forkSourceThreadId: null,
           prefilledDiskSteps: null,
+          storageRoot: root,
         },
         { threadId, hash, dataJsonlPath: dataPath, infoJsonlPath: infoPath, cas },
         logger,
@@ -549,9 +562,6 @@ describe("executeThread", () => {
         { preconnect: origFetch.preconnect.bind(origFetch) },
       ) as typeof fetch;
 
-      const llm: LlmProvider = { baseUrl: "http://127.0.0.1:9", apiKey: "test", model: "test" };
-      const extractFn = createExtract(llm);
-
       const dagWorkflow = createWorkflow<DagDemoMeta>(
         {
           roles: {
@@ -568,8 +578,6 @@ describe("executeThread", () => {
           moderator: (ctx) => (ctx.steps.length === 0 ? "walker" : END),
         },
         { agent: async () => dagRootHash },
-        extractFn,
-        llm,
       );
 
       const threadId = "01KQXKW18CT8G75T53R8F4G7YG";
@@ -577,6 +585,7 @@ describe("executeThread", () => {
       const dataPath = join(root, "logs", hash, `${threadId}.data.jsonl`);
       const infoPath = join(root, "logs", hash, `${threadId}.info.jsonl`);
       await mkdir(join(root, "logs", hash), { recursive: true });
+      await writeExtractRegistryConfig(root);
 
       const logger = createLogger({ sink: { kind: "file", path: infoPath } });
       const ac = new AbortController();
@@ -592,6 +601,7 @@ describe("executeThread", () => {
           awaitAfterEachYield: async () => {},
           forkSourceThreadId: null,
           prefilledDiskSteps: null,
+          storageRoot: root,
         },
         { threadId, hash, dataJsonlPath: dataPath, infoJsonlPath: infoPath, cas },
         logger,

packages/workflow/__tests__/extract-provider.test.ts

@@ -1,93 +0,0 @@
-import { describe, expect, test } from "bun:test";
-import { mkdir, mkdtemp, rm, writeFile } from "node:fs/promises";
-import { tmpdir } from "node:os";
-import { join } from "node:path";
-
-import { getExtractProvider } from "../src/extract-provider.js";
-
-describe("getExtractProvider", () => {
-  test("returns provider when config.models.extract is present", async () => {
-    const root = await mkdtemp(join(tmpdir(), "wf-ext-prov-ok-"));
-    try {
-      await mkdir(root, { recursive: true });
-      await writeFile(
-        join(root, "workflow.yaml"),
-        `config:
-  maxDepth: 3
-  providers:
-    dashscope:
-      baseUrl: https://dashscope.aliyuncs.com/compatible-mode/v1
-      apiKey: literal-key
-  models:
-    default: dashscope/qwen-turbo
-    extract: dashscope/qwen-plus
-workflows: {}
-`,
-        "utf8",
-      );
-      const r = await getExtractProvider(root);
-      expect(r.ok).toBe(true);
-      if (!r.ok) {
-        return;
-      }
-      expect(r.value.baseUrl).toBe("https://dashscope.aliyuncs.com/compatible-mode/v1");
-      expect(r.value.model).toBe("qwen-plus");
-      expect(r.value.apiKey).toBe("literal-key");
-    } finally {
-      await rm(root, { recursive: true, force: true });
-    }
-  });
-
-  test("errs when registry has no config section", async () => {
-    const root = await mkdtemp(join(tmpdir(), "wf-ext-prov-missing-"));
-    try {
-      await mkdir(root, { recursive: true });
-      await writeFile(join(root, "workflow.yaml"), "workflows: {}\n", "utf8");
-      const r = await getExtractProvider(root);
-      expect(r.ok).toBe(false);
-      if (r.ok) {
-        return;
-      }
-      expect(r.error).toContain("no global config");
-    } finally {
-      await rm(root, { recursive: true, force: true });
-    }
-  });
-
-  test("resolves apiKey from env at registry read time", async () => {
-    const root = await mkdtemp(join(tmpdir(), "wf-ext-prov-env-"));
-    const prev = process.env.WF_GET_EXTRACT_PROVIDER_KEY;
-    process.env.WF_GET_EXTRACT_PROVIDER_KEY = "resolved-secret";
-    try {
-      await mkdir(root, { recursive: true });
-      await writeFile(
-        join(root, "workflow.yaml"),
-        `config:
-  maxDepth: 1
-  providers:
-    p:
-      baseUrl: https://example.com
-      apiKey: env:WF_GET_EXTRACT_PROVIDER_KEY
-  models:
-    default: p/other-model
-    extract: p/m
-workflows: {}
-`,
-        "utf8",
-      );
-      const r = await getExtractProvider(root);
-      expect(r.ok).toBe(true);
-      if (!r.ok) {
-        return;
-      }
-      expect(r.value.apiKey).toBe("resolved-secret");
-    } finally {
-      if (prev === undefined) {
-        delete process.env.WF_GET_EXTRACT_PROVIDER_KEY;
-      } else {
-        process.env.WF_GET_EXTRACT_PROVIDER_KEY = prev;
-      }
-      await rm(root, { recursive: true, force: true });
-    }
-  });
-});

packages/workflow/__tests__/refs-tracking.test.ts

@@ -1,5 +1,5 @@
 import { afterEach, describe, expect, test } from "bun:test";
-import { mkdir, mkdtemp, readFile, rm } from "node:fs/promises";
+import { mkdir, mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
 import * as z from "zod/v4";
@@ -8,7 +8,6 @@ import { createCasStore } from "../src/cas/cas.js";
 import { createWorkflow } from "../src/engine/create-workflow.js";
 import { executeThread } from "../src/engine/engine.js";
 import { buildForkPlan, parseThreadDataJsonl } from "../src/engine/fork-thread.js";
-import { createExtract } from "../src/extract/extract-fn.js";
 import { END } from "../src/types.js";
 import { createLogger } from "../src/util/logger.js";
 
@@ -76,11 +75,16 @@ function installMockChatCompletions(sequence: ReadonlyArray<Record<string, unkno
   };
 }
 
-const refsDemoExtract = createExtract({
+const EXTRACT_REGISTRY_YAML = `config:
-  baseUrl: "http://127.0.0.1:9",
+  maxDepth: 3
-  apiKey: "test",
+  providers:
-  model: "test",
+    stub:
-});
+      baseUrl: http://127.0.0.1:9
+      apiKey: test
+  models:
+    default: stub/model
+workflows: {}
+`;
 
 const refsDemoWorkflow = createWorkflow<RefsDemoMeta>(
   {
@@ -99,8 +103,6 @@ const refsDemoWorkflow = createWorkflow<RefsDemoMeta>(
   {
     agent: async () => "plan-output",
   },
-  refsDemoExtract,
-  null,
 );
 
 describe("RoleStep refs tracking", () => {
@@ -142,6 +144,7 @@ describe("RoleStep refs tracking", () => {
       const dataPath = join(root, "logs", hash, `${threadId}.data.jsonl`);
       const infoPath = join(root, "logs", hash, `${threadId}.info.jsonl`);
       await mkdir(join(root, "logs", hash), { recursive: true });
+      await writeFile(join(root, "workflow.yaml"), EXTRACT_REGISTRY_YAML, "utf8");
       const cas = createCasStore(join(root, "cas"));
 
       const logger = createLogger({ sink: { kind: "file", path: infoPath } });
@@ -158,6 +161,7 @@ describe("RoleStep refs tracking", () => {
           awaitAfterEachYield: async () => {},
           forkSourceThreadId: null,
           prefilledDiskSteps: null,
+          storageRoot: root,
         },
         { threadId, hash, dataJsonlPath: dataPath, infoJsonlPath: infoPath, cas },
         logger,

packages/workflow/__tests__/worker.test.ts

@@ -9,6 +9,17 @@ import { createCasStore } from "../src/cas/cas.js";
 import { createContentMerkleNode, serializeMerkleNode } from "../src/cas/merkle.js";
 import { getWorkerHostScriptPath } from "../src/engine/worker-entry-path.js";
 
+const WORKER_REGISTRY_YAML = `config:
+  maxDepth: 3
+  providers:
+    stub:
+      baseUrl: http://127.0.0.1:9
+      apiKey: test
+  models:
+    default: stub/model
+workflows: {}
+`;
+
 const bundleSource = `import { putContentMerkleNode } from "@uncaged/workflow";
 
 export const descriptor = {
@@ -89,6 +100,7 @@ describe("worker process", () => {
     try {
       const hash = "C9NMV6V2TQT81";
       await mkdir(join(root, "bundles"), { recursive: true });
+      await writeFile(join(root, "workflow.yaml"), WORKER_REGISTRY_YAML, "utf8");
       const bundlePath = join(root, "bundles", `${hash}.esm.js`);
       await writeFile(bundlePath, bundleSource, "utf8");
 
@@ -136,6 +148,7 @@ describe("worker process", () => {
     try {
       const hash = "C9NMV6V2TQT81";
       await mkdir(join(root, "bundles"), { recursive: true });
+      await writeFile(join(root, "workflow.yaml"), WORKER_REGISTRY_YAML, "utf8");
       const bundlePath = join(root, "bundles", `${hash}.esm.js`);
       await writeFile(bundlePath, bundleSource, "utf8");
 

packages/workflow/__tests__/workflow-as-agent-integration.test.ts

@@ -9,7 +9,6 @@ import { hashWorkflowBundleBytes } from "../src/cas/hash.js";
 import { getContentMerklePayload, parseMerkleNode } from "../src/cas/merkle.js";
 import { createWorkflow } from "../src/engine/create-workflow.js";
 import { executeThread } from "../src/engine/engine.js";
-import { createExtract } from "../src/extract/extract-fn.js";
 import {
   readWorkflowRegistry,
   registerWorkflowVersion,
@@ -76,11 +75,16 @@ function installMockChatCompletions(sequence: ReadonlyArray<Record<string, unkno
   };
 }
 
-const parentExtract = createExtract({
+const PARENT_REGISTRY_WITH_CONFIG = `config:
-  baseUrl: "http://127.0.0.1:9",
+  maxDepth: 3
-  apiKey: "test",
+  providers:
-  model: "test",
+    stub:
-});
+      baseUrl: http://127.0.0.1:9
+      apiKey: test
+  models:
+    default: stub/m
+workflows: {}
+`;
 
 const childBundleSource = `import { putContentMerkleNode } from "@uncaged/workflow";
 
@@ -131,6 +135,8 @@ describe("workflowAsAgent integration", () => {
 
     const root = await mkdtemp(join(tmpdir(), "wf-waa-int-"));
     try {
+      await mkdir(root, { recursive: true });
+      await writeFile(join(root, "workflow.yaml"), PARENT_REGISTRY_WITH_CONFIG, "utf8");
       const { hash: childHash } = await installChildWorkflow(root);
 
       const parentWorkflow = createWorkflow<ParentMeta>(
@@ -148,8 +154,6 @@ describe("workflowAsAgent integration", () => {
           moderator: (ctx) => (ctx.steps.length === 0 ? "caller" : END),
         },
         { agent: workflowAsAgent("child-wf", { storageRoot: root }) },
-        parentExtract,
-        null,
       );
 
       const threadId = "01KQXKW18CT8G75T53R8F4G7YG";
@@ -173,6 +177,7 @@ describe("workflowAsAgent integration", () => {
           awaitAfterEachYield: async () => {},
           forkSourceThreadId: null,
           prefilledDiskSteps: null,
+          storageRoot: root,
         },
         { threadId, hash: parentHash, dataJsonlPath: dataPath, infoJsonlPath: infoPath, cas },
         logger,

packages/workflow/__tests__/workflow-as-agent.test.ts

@@ -93,6 +93,21 @@ describe("workflowAsAgent", () => {
   test("runs registered workflow and returns child thread root CAS hash", async () => {
     const root = await mkdtemp(join(tmpdir(), "wf-waa-ok-"));
     try {
+      await mkdir(root, { recursive: true });
+      await writeFile(
+        join(root, "workflow.yaml"),
+        `config:
+  maxDepth: 3
+  providers:
+    stub:
+      baseUrl: http://127.0.0.1:9
+      apiKey: test
+  models:
+    default: stub/m
+workflows: {}
+`,
+        "utf8",
+      );
       await installChildWorkflow(root);
       const agent = workflowAsAgent("child-wf", { storageRoot: root });
       const out = await agent(

packages/workflow/src/engine/create-workflow.ts

@@ -1,12 +1,10 @@
-import type { CasStore } from "../cas/index.js";
 import { putContentMerkleNode } from "../cas/index.js";
-import { buildExtractUserContent, type ExtractFn, reactExtract } from "../extract/index.js";
+import { buildExtractUserContent, reactExtract } from "../extract/index.js";
 import {
   type AgentBinding,
   type AgentContext,
   END,
   type ExtractContext,
-  type LlmProvider,
   type ModeratorContext,
   type RoleDefinition,
   type RoleMeta,
@@ -41,14 +39,12 @@ function resolveExtractedRefs(
 async function resolveRoleMeta<M extends RoleMeta>(
   roleDef: RoleDefinition<Record<string, unknown>>,
   extractCtx: ExtractContext<M>,
-  extract: ExtractFn,
+  options: WorkflowFnOptions,
-  llmProvider: LlmProvider | null,
-  cas: CasStore,
 ): Promise<Record<string, unknown>> {
   if (roleDef.extractMode === "react") {
-    if (llmProvider === null) {
+    if (options.llmProvider === null) {
       throw new Error(
-        'createWorkflow: llmProvider is required when a role uses extractMode "react"',
+        'createWorkflow: WorkflowFnOptions.llmProvider is required when a role uses extractMode "react"',
       );
     }
     const text = await buildExtractUserContent(
@@ -58,15 +54,15 @@ async function resolveRoleMeta<M extends RoleMeta>(
     const reactResult = await reactExtract({
       text,
       schema: roleDef.schema,
-      provider: llmProvider,
+      provider: options.llmProvider,
-      cas,
+      cas: options.cas,
     });
     if (!reactResult.ok) {
       throw new Error(`react extract failed: ${reactResult.error}`);
     }
     return reactResult.value as Record<string, unknown>;
   }
-  return (await extract(
+  return (await options.extract(
     roleDef.schema,
     roleDef.extractPrompt,
     extractCtx as unknown as ExtractContext,
@@ -74,15 +70,13 @@ async function resolveRoleMeta<M extends RoleMeta>(
 }
 
 /**
- * Binds pure role definitions + moderator to runtime agents and structured extraction.
+ * Binds pure role definitions + moderator to runtime agents.
- * Assign with `export const run = createWorkflow(def, binding, extract, llmProvider)`.
+ * Assign with `export const run = createWorkflow(def, binding)`.
- * Pass the same {@link LlmProvider} as {@link createExtract} when any role uses `extractMode: "react"`.
+ * The engine supplies {@link WorkflowFnOptions.extract} and {@link WorkflowFnOptions.llmProvider} from workflow.yaml.
  */
 export function createWorkflow<M extends RoleMeta>(
   def: Pick<WorkflowDefinition<M>, "roles" | "moderator">,
   binding: AgentBinding,
-  extract: ExtractFn,
-  llmProvider: LlmProvider | null,
 ): WorkflowFn {
   return async function* workflowLoop(
     input: ThreadInput,
@@ -149,9 +143,7 @@ export function createWorkflow<M extends RoleMeta>(
       const meta = await resolveRoleMeta(
         roleDef as unknown as RoleDefinition<Record<string, unknown>>,
         extractCtx,
-        extract,
+        options,
-        llmProvider,
-        options.cas,
       );
 
       const contentHash = await putContentMerkleNode(options.cas, raw);

packages/workflow/src/engine/engine.ts

@@ -7,17 +7,47 @@ import {
   putStepMerkleNode,
   putThreadMerkleNode,
 } from "../cas/index.js";
+import { resolveModel } from "../config/index.js";
+import { createExtract } from "../extract/index.js";
+import { readWorkflowRegistry } from "../registry/index.js";
 import type {
+  LlmProvider,
   ThreadInput,
   WorkflowCompletion,
   WorkflowFn,
   WorkflowFnOptions,
   WorkflowResult,
 } from "../types.js";
-import { type LogFn, normalizeRefsField } from "../util/index.js";
+import { err, type LogFn, normalizeRefsField, ok, type Result } from "../util/index.js";
 
 import type { ExecuteThreadIo, ExecuteThreadOptions } from "./types.js";
 
+async function resolveExtractRuntime(
+  storageRoot: string,
+): Promise<
+  Result<{ extract: ReturnType<typeof createExtract>; llmProvider: LlmProvider }, string>
+> {
+  const reg = await readWorkflowRegistry(storageRoot);
+  if (!reg.ok) {
+    return err(reg.error.message);
+  }
+  const cfg = reg.value.config;
+  if (cfg === null) {
+    return err("workflow registry has no global config section");
+  }
+  const resolved = resolveModel(cfg, "extract");
+  if (!resolved.ok) {
+    return resolved;
+  }
+  const ex = resolved.value;
+  const llmProvider: LlmProvider = {
+    baseUrl: ex.baseUrl,
+    apiKey: ex.apiKey,
+    model: ex.model,
+  };
+  return ok({ extract: createExtract(llmProvider), llmProvider });
+}
+
 async function appendDataLine(path: string, record: unknown): Promise<void> {
   const line = `${JSON.stringify(record)}\n`;
   await appendFile(path, line, "utf8");
@@ -250,11 +280,18 @@ export async function executeThread(
     });
   }
 
+  const extractRuntime = await resolveExtractRuntime(options.storageRoot);
+  if (!extractRuntime.ok) {
+    throw new Error(extractRuntime.error);
+  }
+
   const bundleOptions: WorkflowFnOptions = {
     threadId: io.threadId,
     maxRounds: options.maxRounds,
     depth: options.depth,
     cas: io.cas,
+    extract: extractRuntime.value.extract,
+    llmProvider: extractRuntime.value.llmProvider,
   };
 
   return await driveWorkflowGenerator({

packages/workflow/src/engine/types.ts

@@ -33,6 +33,8 @@ export type ExecuteThreadOptions = {
    * Must match `input.steps` length and order when present.
    */
   prefilledDiskSteps: PrefilledDiskStep[] | null;
+  /** Workspace root containing `workflow.yaml`; used to resolve the `extract` scene for meta extraction. */
+  storageRoot: string;
 };
 
 /** Role steps replayed from `.data.jsonl`, including persisted timestamps. */

packages/workflow/src/engine/worker.ts

@@ -417,6 +417,7 @@ async function main(): Promise<void> {
           awaitAfterEachYield: () => pauseGate.awaitAfterYield(),
           forkSourceThreadId: cmd.forkSourceThreadId,
           prefilledDiskSteps,
+          storageRoot,
         },
         io,
         logger,

packages/workflow/src/extract-provider.ts

@@ -1,39 +0,0 @@
-import { resolveModel } from "./config/index.js";
-import type { WorkflowConfig } from "./registry/index.js";
-import { readWorkflowRegistry } from "./registry/index.js";
-import type { LlmProvider } from "./types.js";
-import { err, getDefaultWorkflowStorageRoot, ok, type Result } from "./util/index.js";
-
-const DEFAULT_WORKFLOW_AS_AGENT_MAX_DEPTH = 3;
-
-export function getWorkflowAsAgentMaxDepth(config: WorkflowConfig | null): number {
-  if (config === null) {
-    return DEFAULT_WORKFLOW_AS_AGENT_MAX_DEPTH;
-  }
-  return config.maxDepth;
-}
-
-/** Loads the LLM provider for scene `extract` from workflow.yaml (`config.models` + `config.providers`; apiKey resolved at registry parse time). */
-export async function getExtractProvider(
-  storageRoot: string | undefined,
-): Promise<Result<LlmProvider, string>> {
-  const root = storageRoot ?? getDefaultWorkflowStorageRoot();
-  const regResult = await readWorkflowRegistry(root);
-  if (!regResult.ok) {
-    return err(regResult.error.message);
-  }
-  const cfg = regResult.value.config;
-  if (cfg === null) {
-    return err("workflow registry has no global config section");
-  }
-  const resolved = resolveModel(cfg, "extract");
-  if (!resolved.ok) {
-    return resolved;
-  }
-  const ex = resolved.value;
-  return ok({
-    baseUrl: ex.baseUrl,
-    apiKey: ex.apiKey,
-    model: ex.model,
-  });
-}

packages/workflow/src/index.ts

@@ -63,7 +63,6 @@ export {
   type ReactExtractArgs,
   reactExtract,
 } from "./extract/index.js";
-export { getExtractProvider } from "./extract-provider.js";
 export {
   getRegisteredWorkflow,
   listRegisteredWorkflowNames,

packages/workflow/src/types.ts

@@ -1,6 +1,7 @@
 import type * as z from "zod/v4";
 
 import type { CasStore } from "./cas/index.js";
+import type { ExtractFn } from "./extract/types.js";
 
 /** Sentinel values for automaton control flow. */
 export const START = "__start__" as const;
@@ -54,6 +55,10 @@ export type WorkflowFnOptions = {
   depth: number;
   /** Global CAS store for Merkle content blobs (role step bodies). */
   cas: CasStore;
+  /** Structured meta extraction; resolved from workflow.yaml `extract` scene by the engine. */
+  extract: ExtractFn;
+  /** Provider for `extractMode: "react"` roles; same backing config as `extract`. */
+  llmProvider: LlmProvider | null;
 };
 
 /** Bundle contract — named export `run` is a function returning an AsyncGenerator. */

packages/workflow/src/workflow-as-agent.ts

@@ -4,7 +4,7 @@ import { extractBundleExports } from "./bundle/index.js";
 import { createCasStore } from "./cas/index.js";
 import type { ExecuteThreadIo } from "./engine/index.js";
 import { executeThread } from "./engine/index.js";
-import { getWorkflowAsAgentMaxDepth } from "./extract-provider.js";
+import type { WorkflowConfig } from "./registry/index.js";
 import { getRegisteredWorkflow, readWorkflowRegistry } from "./registry/index.js";
 import type { AgentContext, AgentFn, ThreadInput } from "./types.js";
 import {
@@ -14,6 +14,15 @@ import {
   getGlobalCasDir,
 } from "./util/index.js";
 
+const DEFAULT_WORKFLOW_AS_AGENT_MAX_DEPTH = 3;
+
+function workflowAsAgentMaxDepth(config: WorkflowConfig | null): number {
+  if (config === null) {
+    return DEFAULT_WORKFLOW_AS_AGENT_MAX_DEPTH;
+  }
+  return config.maxDepth;
+}
+
 export type WorkflowAsAgentOptions = {
   /** When `null`, uses `getDefaultWorkflowStorageRoot()`. */
   storageRoot: string | null;
@@ -44,7 +53,7 @@ export function workflowAsAgent(
       return `ERROR: failed to read workflow registry: ${registryResult.error.message}`;
     }
 
-    const maxDepth = getWorkflowAsAgentMaxDepth(registryResult.value.config);
+    const maxDepth = workflowAsAgentMaxDepth(registryResult.value.config);
     if (nextDepth > maxDepth) {
       return `ERROR: workflow-as-agent depth limit exceeded (max ${maxDepth})`;
     }
@@ -92,6 +101,7 @@ export function workflowAsAgent(
           awaitAfterEachYield: async () => {},
           forkSourceThreadId: ctx.threadId,
           prefilledDiskSteps: null,
+          storageRoot,
         },
         io,
         logger,