refactor: named exports (run + descriptor), remove build pipeline

- Bundle contract: export const run + export const descriptor (no default export)
- add only accepts .esm.js, extracts descriptor via dynamic import → .yaml
- Removed: build-pipeline, generate-types, json-schema-to-ts
- Worker loads mod.run instead of mod.default
- Biome: no more noDefaultExport overrides for bundles
- 62 tests pass, biome clean

Closes #8
小橘 <xiaoju@shazhou.work>

CLAUDE.md

@@ -8,7 +8,7 @@
 
 | Concept | What it is |
 |---------|-----------|
-| **Workflow** | A single-file ESM module that default-exports a workflow function. Identified by its XXH64 hash (Crockford Base32). |
+| **Workflow** | A single-file ESM module that exports `run` (workflow function) and `descriptor` (metadata). Identified by its XXH64 hash (Crockford Base32). |
 | **Bundle** | The physical `.esm.js` file stored in `~/.uncaged/workflow/bundles/`. |
 | **Thread** | A single execution of a workflow, identified by a ULID. Persisted as `.data.jsonl` + `.info.jsonl`. |
 | **Role** | A named actor within a workflow. Each role produces output with typed `meta`. |
@@ -95,7 +95,7 @@ type WorkflowEntry = {
 - Always named exports, never default exports
 - One module = one responsibility, filename = purpose
 
-**Exception**: Workflow bundle files (`.esm.js`) use default export by design — this is the user-authored extension point.
+Workflow bundles (`.esm.js`) follow the same rule: export `const run` and `const descriptor`, not `export default`.
 
 ## Naming
 
@@ -177,7 +177,7 @@ console.log(result);
 
 Do NOT use `await import()` in production code. Always use static top-level `import`.
 
-**Exception**: The bundle loader must dynamically import user workflow files at runtime.
+**Exception**: The bundle loader and `extractBundleExports` dynamically import user workflow files at runtime.
 
 ```ts
 // Dynamic import required: user bundle path resolved at runtime

biome.json

@@ -38,16 +38,6 @@
           }
         }
       }
-    },
-    {
-      "includes": ["examples/**/*.ts", "packages/workflow/__tests__/fixtures/**/*.ts"],
-      "linter": {
-        "rules": {
-          "style": {
-            "noDefaultExport": "off"
-          }
-        }
-      }
     }
   ],
   "linter": {

docs/rfc-001-workflow-engine.md

@@ -19,7 +19,7 @@ Monorepo uses **bun workspace**.
 
 ## 2. Workflow Physical Implementation
 
-A **Workflow** is a single-file ESM module that default-exports an **AsyncGenerator** function:
+A **Workflow** is a single-file ESM module that **named-exports** an **AsyncGenerator** function as `run` and workflow metadata as `descriptor`:
 
 ```typescript
 /** What each yield produces — one role's output. */
@@ -54,8 +54,22 @@ The workflow **yields** each role output instead of writing to an injected write
 exporting a framework-specific shape:
 
 ```typescript
-// Example bundle — zero framework dependency
+// Example bundle — zero framework dependency (named exports only)
-export default async function* (input, options) {
+export const descriptor = {
+  description: "Fix auth bug",
+  roles: {
+    planner: {
+      description: "Plans the fix",
+      schema: { type: "object", properties: { files: { type: "array", items: { type: "string" } } } },
+    },
+    coder: {
+      description: "Implements the plan",
+      schema: { type: "object", properties: { diff: { type: "string" } } },
+    },
+  },
+};
+
+export const run = async function* (input, options) {
   const plan = await callLLM("plan: " + input.prompt);
   yield { role: "planner", content: plan, meta: { files: ["src/auth.ts"] } };
 
@@ -63,7 +77,7 @@ export default async function* (input, options) {
   yield { role: "coder", content: code, meta: { diff: "..." } };
 
   return { returnCode: 0, summary: "Fixed auth bug" };
-}
+};
 ```
 
 **Engine controls the loop**, not the bundle:
@@ -104,14 +118,20 @@ any framework types.
 ### Constraints
 
 - Single `.esm.js` file
+- Named exports `run` (callable AsyncGenerator workflow) and `descriptor` (metadata object)
+- No default export
 - No dynamic `import()`
 - All static imports must be Node built-in modules only
 
 This guarantees the file is self-contained, and its **XXH64 hash** (encoded as Crockford Base32) serves as a globally unique version identifier.
 
-### Role Descriptor (Optional)
+### Role Descriptor (`export const descriptor`)
 
-A YAML file alongside the bundle describes roles for tooling/agent consumption:
+The bundle **must** export a `descriptor` object describing roles for tooling/agent consumption.
+
+Shape: `{ description: string, roles: Record<string, { description: string, schema: JSONSchema }> }`
+
+When you register a bundle via `uncaged-workflow add`, the engine imports the module, validates `descriptor`, and writes `{hash}.yaml` next to `{hash}.esm.js` under `bundles/` (same serialized shape as below):
 
 ```yaml
 description: "Workflow brief introduction"
@@ -136,9 +156,7 @@ roles:
           type: string
 ```
 
-Format: `{ description: string, roles: Record<string, { description: string, schema: JSONSchema }> }`
+Execution uses `run` only; YAML is for tooling and introspection.
-
-This file is **not required** for execution.
 
 ## 3. Storage Layout
 
@@ -148,7 +166,7 @@ All data lives under `~/.uncaged/workflow/`:
 ~/.uncaged/workflow/
 ├── bundles/                              # ESM bundles
 │   ├── C9NMV6V2TQT81.esm.js             # Crockford Base32 of XXH64 hash
-│   └── C9NMV6V2TQT81.yaml               # Role descriptor (optional)
+│   └── C9NMV6V2TQT81.yaml               # Role descriptor (from bundle export, at register time)
 ├── logs/                                 # Thread data, one folder per bundle hash
 │   └── C9NMV6V2TQT81/
 │       ├── 01KQXKW18CT8G75T53R8F4G7YG.data.jsonl
@@ -249,7 +267,7 @@ No concurrency control or timeout settings in the registry — those belong to e
 
 | Command | Description |
 |---------|-------------|
-| `uncaged-workflow add <name> <file>` | Register a workflow bundle |
+| `uncaged-workflow add <name> <file.esm.js> [--types <path>]` | Register a compiled `.esm.js` bundle (descriptor extracted from `export const descriptor`) |
 | `uncaged-workflow list` | List registered workflows |
 | `uncaged-workflow show <name>` | Show workflow details |
 | `uncaged-workflow remove <name>` | Remove a workflow |
@@ -292,9 +310,17 @@ function createRoleModerator<M extends RoleMeta>(
 Usage in a bundle:
 
 ```typescript
-import { createRoleModerator } from "@uncaged/workflow";
+import { createRoleModerator, END } from "@uncaged/workflow";
 
-export default createRoleModerator({
+export const descriptor = {
+  description: "Example multi-role workflow",
+  roles: {
+    planner: { description: "Plans work", schema: {} },
+    coder: { description: "Writes code", schema: {} },
+  },
+};
+
+export const run = createRoleModerator({
   roles: { planner, coder },
   moderator(ctx) { return ctx.steps.length === 0 ? "planner" : END; },
 });

examples/hello-world.ts

@@ -23,7 +23,7 @@ const greeter: Role<Roles["greeter"]> = async (ctx) => ({
   meta: { greeting: "Hello!" },
 });
 
-export default createRoleModerator<Roles>({
+export const run = createRoleModerator<Roles>({
   roles: { greeter },
   moderator(ctx) {
     return ctx.steps.length === 0 ? "greeter" : END;

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

@@ -1,9 +1,5 @@
-import type { ParsedAddArgv } from "../src/add-argv.js";
+import type { ParsedAddArgv } from "../src/cmd-add.js";
-
-export const MINIMAL_DESCRIPTOR_YAML = `description: "fixture"
-roles: {}
-`;
 
 export function addCliArgs(name: string, filePath: string): ParsedAddArgv {
-  return { name, filePath, descriptorPath: null, typesPath: null };
+  return { name, filePath, typesPath: null };
 }

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

@@ -2,7 +2,6 @@ import { afterEach, beforeEach, describe, expect, test } from "bun:test";
 import { mkdir, mkdtemp, readFile, rm, unlink, writeFile } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
-import { fileURLToPath } from "node:url";
 
 import { getRegisteredWorkflow, readWorkflowRegistry } from "@uncaged/workflow";
 import { cmdAdd } from "../src/cmd-add.js";
@@ -11,7 +10,10 @@ import { cmdList, formatListLines } from "../src/cmd-list.js";
 import { cmdRemove } from "../src/cmd-remove.js";
 import { cmdRollback } from "../src/cmd-rollback.js";
 import { cmdShow } from "../src/cmd-show.js";
-import { addCliArgs, MINIMAL_DESCRIPTOR_YAML } from "./bundle-fixture.js";
+import { addCliArgs } from "./bundle-fixture.js";
+
+const fixtureDescriptor = `export const descriptor = { description: "fixture", roles: {} };
+`;
 
 describe("cli workflow commands", () => {
   let prevEnv: string | undefined;
@@ -38,9 +40,9 @@ describe("cli workflow commands", () => {
     const bundlePath = join(bundleDir, "demo.esm.js");
     await writeFile(
       bundlePath,
-      `import fs from "node:fs";
+      `${fixtureDescriptor}import fs from "node:fs";
 
-export default async function* (input) {
+export const run = async function* (input) {
   fs.existsSync(".");
   yield { role: "noop", content: input.prompt, meta: { done: true } };
   return { returnCode: 0, summary: "done" };
@@ -48,7 +50,6 @@ export default async function* (input) {
 `,
       "utf8",
     );
-    await writeFile(join(bundleDir, "demo.yaml"), MINIMAL_DESCRIPTOR_YAML, "utf8");
 
     const added = await cmdAdd(storageRoot, addCliArgs("solve-issue", bundlePath));
     expect(added.ok).toBe(true);
@@ -87,18 +88,30 @@ export default async function* (input) {
     const bundlePath = join(storageRoot, "bad.esm.js");
     await writeFile(
       bundlePath,
-      'import x from "./local";\nexport default async function* (input) { return { returnCode: 0, summary: input.prompt }; }\n',
+      `${fixtureDescriptor}import x from "./local";
+export const run = async function* (input) { return { returnCode: 0, summary: input.prompt }; }
+`,
       "utf8",
     );
     const r = await cmdAdd(storageRoot, addCliArgs("solve-issue", bundlePath));
     expect(r.ok).toBe(false);
   });
 
-  test("add rejects .esm.js without companion YAML", async () => {
+  test("add rejects .ts sources", async () => {
+    const tsPath = join(storageRoot, "solo.ts");
+    await writeFile(tsPath, "export const x = 1;\n", "utf8");
+    const r = await cmdAdd(storageRoot, addCliArgs("solo", tsPath));
+    expect(r.ok).toBe(false);
+    if (!r.ok) {
+      expect(r.error).toContain("build your .ts file first");
+    }
+  });
+
+  test("add rejects bundle without descriptor export", async () => {
     const bundlePath = join(storageRoot, "solo.esm.js");
     await writeFile(
       bundlePath,
-      `export default async function* (input) {
+      `export const run = async function* (input) {
   yield { role: "x", content: input.prompt, meta: {} };
   return { returnCode: 0, summary: "ok" };
 }
@@ -107,15 +120,34 @@ export default async function* (input) {
     );
     const r = await cmdAdd(storageRoot, addCliArgs("solo", bundlePath));
     expect(r.ok).toBe(false);
-    if (r.ok) {
+    if (!r.ok) {
-      return;
+      expect(r.error).toContain("descriptor");
     }
-    expect(r.error).toContain("descriptor YAML not found");
   });
 
-  test("add from .ts builds bundle + yaml + d.ts and registers hash", async () => {
+  test("add from .esm.js writes yaml from descriptor export", async () => {
-    const helloTs = fileURLToPath(new URL("../../../examples/hello-world.ts", import.meta.url));
+    const bundleDir = join(storageRoot, "src");
-    const added = await cmdAdd(storageRoot, addCliArgs("hello", helloTs));
+    await mkdir(bundleDir, { recursive: true });
+    const bundlePath = join(bundleDir, "hello.esm.js");
+    await writeFile(
+      bundlePath,
+      `export const descriptor = {
+  description: "hello world fixture",
+  roles: {
+    greeter: {
+      description: "greet",
+      schema: { type: "object", properties: { greeting: { type: "string" } } },
+    },
+  },
+};
+export const run = async function* (input) {
+  yield { role: "greeter", content: input.prompt, meta: { greeting: "hi" } };
+  return { returnCode: 0, summary: "ok" };
+};
+`,
+      "utf8",
+    );
+    const added = await cmdAdd(storageRoot, addCliArgs("hello", bundlePath));
     expect(added.ok).toBe(true);
     if (!added.ok) {
       return;
@@ -125,10 +157,8 @@ export default async function* (input) {
     const esm = await readFile(join(bundles, `${hash}.esm.js`), "utf8");
     expect(esm.length).toBeGreaterThan(100);
     const yaml = await readFile(join(bundles, `${hash}.yaml`), "utf8");
-    expect(yaml).toContain("hello world");
+    expect(yaml).toContain("hello world fixture");
-    const dts = await readFile(join(bundles, `${hash}.d.ts`), "utf8");
+    expect(yaml).toContain("greeter");
-    expect(dts).toContain("export type Roles");
-    expect(dts).toContain("WorkflowFn");
 
     const reg = await readWorkflowRegistry(storageRoot);
     expect(reg.ok).toBe(true);
@@ -143,37 +173,64 @@ export default async function* (input) {
     expect(entry.hash).toBe(hash);
   });
 
-  test("add from .esm.js with --descriptor uses explicit YAML path", async () => {
+  test("add from .esm.js copies optional sidecar .d.ts", async () => {
-    const bundleDir = join(storageRoot, "w");
+    const bundleDir = join(storageRoot, "src");
     await mkdir(bundleDir, { recursive: true });
-    const bundlePath = join(bundleDir, "app.esm.js");
+    const bundlePath = join(bundleDir, "demo.esm.js");
-    const yamlPath = join(bundleDir, "desc.yaml");
     await writeFile(
       bundlePath,
-      `export default async function* (input) {
+      `${fixtureDescriptor}export const run = async function* (input) {
   yield { role: "a", content: "x", meta: {} };
   return { returnCode: 0, summary: "x" };
 }
 `,
       "utf8",
     );
-    await writeFile(yamlPath, MINIMAL_DESCRIPTOR_YAML, "utf8");
+    await writeFile(
+      join(bundleDir, "demo.d.ts"),
+      "export type DemoHint = { hint: string };\n",
+      "utf8",
+    );
+
+    const added = await cmdAdd(storageRoot, addCliArgs("typed-demo", bundlePath));
+    expect(added.ok).toBe(true);
+    if (!added.ok) {
+      return;
+    }
+    const dts = await readFile(join(storageRoot, "bundles", `${added.value.hash}.d.ts`), "utf8");
+    expect(dts).toContain("DemoHint");
+  });
+
+  test("add from .esm.js with --types uses explicit d.ts path", async () => {
+    const bundleDir = join(storageRoot, "w");
+    await mkdir(bundleDir, { recursive: true });
+    const bundlePath = join(bundleDir, "app.esm.js");
+    const dtsPath = join(bundleDir, "types.d.ts");
+    await writeFile(
+      bundlePath,
+      `${fixtureDescriptor}export const run = async function* (input) {
+  yield { role: "a", content: "x", meta: {} };
+  return { returnCode: 0, summary: "x" };
+}
+`,
+      "utf8",
+    );
+    await writeFile(dtsPath, "export type App = 1;\n", "utf8");
 
     const added = await cmdAdd(storageRoot, {
       name: "app",
       filePath: bundlePath,
-      descriptorPath: yamlPath,
+      typesPath: dtsPath,
-      typesPath: null,
     });
     expect(added.ok).toBe(true);
     if (!added.ok) {
       return;
     }
-    const yamlStored = await readFile(
+    const dtsStored = await readFile(
-      join(storageRoot, "bundles", `${added.value.hash}.yaml`),
+      join(storageRoot, "bundles", `${added.value.hash}.d.ts`),
       "utf8",
     );
-    expect(yamlStored).toContain("fixture");
+    expect(dtsStored).toContain("App");
   });
 
   test("add from .esm.js warns when optional .d.ts is missing", async () => {
@@ -182,14 +239,13 @@ export default async function* (input) {
     const bundlePath = join(bundleDir, "demo.esm.js");
     await writeFile(
       bundlePath,
-      `export default async function* (input) {
+      `${fixtureDescriptor}export const run = async function* (input) {
   yield { role: "a", content: "x", meta: {} };
   return { returnCode: 0, summary: "x" };
 }
 `,
       "utf8",
     );
-    await writeFile(join(bundleDir, "demo.yaml"), MINIMAL_DESCRIPTOR_YAML, "utf8");
 
     const added = await cmdAdd(storageRoot, addCliArgs("solve-issue", bundlePath));
     expect(added.ok).toBe(true);
@@ -204,18 +260,17 @@ export default async function* (input) {
     const bundleDir = join(storageRoot, "src");
     await mkdir(bundleDir, { recursive: true });
     const bundlePath = join(bundleDir, "demo.esm.js");
-    const v1 = `export default async function* (input) {
+    const v1 = `${fixtureDescriptor}export const run = async function* (input) {
   yield { role: "a", content: "v1", meta: {} };
   return { returnCode: 0, summary: "v1" };
 }
 `;
-    const v2 = `export default async function* (input) {
+    const v2 = `${fixtureDescriptor}export const run = async function* (input) {
   yield { role: "a", content: "v2", meta: {} };
   return { returnCode: 0, summary: "v2" };
 }
 `;
     await writeFile(bundlePath, v1, "utf8");
-    await writeFile(join(bundleDir, "demo.yaml"), MINIMAL_DESCRIPTOR_YAML, "utf8");
     const add1 = await cmdAdd(storageRoot, addCliArgs("solve-issue", bundlePath));
     expect(add1.ok).toBe(true);
     await new Promise((r) => setTimeout(r, 15));
@@ -243,18 +298,17 @@ export default async function* (input) {
     const bundleDir = join(storageRoot, "src");
     await mkdir(bundleDir, { recursive: true });
     const bundlePath = join(bundleDir, "demo.esm.js");
-    const v1 = `export default async function* (input) {
+    const v1 = `${fixtureDescriptor}export const run = async function* (input) {
   yield { role: "a", content: "v1", meta: {} };
   return { returnCode: 0, summary: "v1" };
 }
 `;
-    const v2 = `export default async function* (input) {
+    const v2 = `${fixtureDescriptor}export const run = async function* (input) {
   yield { role: "a", content: "v2", meta: {} };
   return { returnCode: 0, summary: "v2" };
 }
 `;
     await writeFile(bundlePath, v1, "utf8");
-    await writeFile(join(bundleDir, "demo.yaml"), MINIMAL_DESCRIPTOR_YAML, "utf8");
     const add1 = await cmdAdd(storageRoot, addCliArgs("solve-issue", bundlePath));
     expect(add1.ok).toBe(true);
     if (!add1.ok) {
@@ -292,19 +346,18 @@ export default async function* (input) {
     const bundlePath = join(bundleDir, "demo.esm.js");
     await writeFile(
       bundlePath,
-      `export default async function* (input) {
+      `${fixtureDescriptor}export const run = async function* (input) {
   yield { role: "a", content: "x", meta: {} };
   return { returnCode: 0, summary: "x" };
 }
 `,
       "utf8",
     );
-    await writeFile(join(bundleDir, "demo.yaml"), MINIMAL_DESCRIPTOR_YAML, "utf8");
     const add1 = await cmdAdd(storageRoot, addCliArgs("solve-issue", bundlePath));
     expect(add1.ok).toBe(true);
     await writeFile(
       bundlePath,
-      `export default async function* (input) {
+      `${fixtureDescriptor}export const run = async function* (input) {
   yield { role: "a", content: "y", meta: {} };
   return { returnCode: 0, summary: "y" };
 }
@@ -324,14 +377,13 @@ export default async function* (input) {
     const bundlePath = join(bundleDir, "demo.esm.js");
     await writeFile(
       bundlePath,
-      `export default async function* (input) {
+      `${fixtureDescriptor}export const run = async function* (input) {
   yield { role: "a", content: "x", meta: {} };
   return { returnCode: 0, summary: "x" };
 }
 `,
       "utf8",
     );
-    await writeFile(join(bundleDir, "demo.yaml"), MINIMAL_DESCRIPTOR_YAML, "utf8");
     const add1 = await cmdAdd(storageRoot, addCliArgs("solve-issue", bundlePath));
     expect(add1.ok).toBe(true);
     if (!add1.ok) {
@@ -340,7 +392,7 @@ export default async function* (input) {
     const hash1 = add1.value.hash;
     await writeFile(
       bundlePath,
-      `export default async function* (input) {
+      `${fixtureDescriptor}export const run = async function* (input) {
   yield { role: "a", content: "y", meta: {} };
   return { returnCode: 0, summary: "y" };
 }

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

@@ -6,10 +6,18 @@ import { cmdAdd } from "../src/cmd-add.js";
 import { cmdFork } from "../src/cmd-fork.js";
 import { cmdRun } from "../src/cmd-run.js";
 import { pathExists } from "../src/fs-utils.js";
-import { addCliArgs, MINIMAL_DESCRIPTOR_YAML } from "./bundle-fixture.js";
+import { addCliArgs } from "./bundle-fixture.js";
 
 /** Three-role workflow that respects `input.steps` for fork/resume. */
-const threeRoleBundleSource = `export default async function* (input) {
+const threeRoleBundleSource = `export const descriptor = {
+  description: "fork-cli",
+  roles: {
+    planner: { description: "planner", schema: {} },
+    coder: { description: "coder", schema: {} },
+    reviewer: { description: "reviewer", schema: {} },
+  },
+};
+export const run = async function* (input) {
   const has = (r) => input.steps.some((s) => s.role === r);
   if (!has("planner")) {
     yield { role: "planner", content: "p1", meta: { k: "planner" } };
@@ -25,7 +33,7 @@ const threeRoleBundleSource = `export default async function* (input) {
     };
   }
   return { returnCode: 0, summary: "done" };
-}
+};
 `;
 
 async function countDataJsonlLines(dataPath: string): Promise<number> {
@@ -82,7 +90,6 @@ describe("cli fork", () => {
     await mkdir(bundleDir, { recursive: true });
     const bundlePath = join(bundleDir, "demo.esm.js");
     await writeFile(bundlePath, threeRoleBundleSource, "utf8");
-    await writeFile(join(bundleDir, "demo.yaml"), MINIMAL_DESCRIPTOR_YAML, "utf8");
 
     const added = await cmdAdd(storageRoot, addCliArgs("solve-issue", bundlePath));
     expect(added.ok).toBe(true);
@@ -133,7 +140,6 @@ describe("cli fork", () => {
     await mkdir(bundleDir, { recursive: true });
     const bundlePath = join(bundleDir, "demo.esm.js");
     await writeFile(bundlePath, threeRoleBundleSource, "utf8");
-    await writeFile(join(bundleDir, "demo.yaml"), MINIMAL_DESCRIPTOR_YAML, "utf8");
 
     const added = await cmdAdd(storageRoot, addCliArgs("solve-issue", bundlePath));
     expect(added.ok).toBe(true);
@@ -185,7 +191,6 @@ describe("cli fork", () => {
     await mkdir(bundleDir, { recursive: true });
     const bundlePath = join(bundleDir, "demo.esm.js");
     await writeFile(bundlePath, threeRoleBundleSource, "utf8");
-    await writeFile(join(bundleDir, "demo.yaml"), MINIMAL_DESCRIPTOR_YAML, "utf8");
 
     const added = await cmdAdd(storageRoot, addCliArgs("solve-issue", bundlePath));
     expect(added.ok).toBe(true);

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

@@ -13,46 +13,64 @@ import { cmdRun } from "../src/cmd-run.js";
 import { cmdThreadRemove, cmdThreadShow } from "../src/cmd-thread.js";
 import { cmdThreads } from "../src/cmd-threads.js";
 import { pathExists } from "../src/fs-utils.js";
-import { addCliArgs, MINIMAL_DESCRIPTOR_YAML } from "./bundle-fixture.js";
+import { addCliArgs } from "./bundle-fixture.js";
 
-const fastBundleSource = `export default async function* (input) {
+const threadFixtureDescriptor = `export const descriptor = {
+  description: "thread-cli",
+  roles: {
+    planner: { description: "planner", schema: {} },
+    coder: { description: "coder", schema: {} },
+    first: { description: "first", schema: {} },
+    second: { description: "second", schema: {} },
+    only: { description: "only", schema: {} },
+    noop: { description: "noop", schema: {} },
+  },
+};
+`;
+
+const fastBundleSource = `${threadFixtureDescriptor}
+export const run = async function* (input) {
   yield { role: "planner", content: "plan", meta: { plan: input.prompt } };
   yield { role: "coder", content: "code", meta: { diff: "y" } };
   return { returnCode: 0, summary: "done" };
-}
+};
 `;
 
-const slowPlannerBundleSource = `export default async function* (input) {
+const slowPlannerBundleSource = `${threadFixtureDescriptor}
+export const run = async function* (input) {
   await new Promise((r) => setTimeout(r, 400));
   yield { role: "planner", content: "plan", meta: { plan: input.prompt } };
   yield { role: "coder", content: "code", meta: { diff: "y" } };
   return { returnCode: 0, summary: "done" };
-}
+};
 `;
 
 const cliEntryPath = fileURLToPath(new URL("../src/cli.ts", import.meta.url));
 
-const abortablePlannerBundleSource = `export default async function* (input) {
+const abortablePlannerBundleSource = `${threadFixtureDescriptor}
+export const run = async function* (input) {
   await new Promise((r) => setTimeout(r, 600));
   yield { role: "planner", content: "plan", meta: { plan: input.prompt } };
   yield { role: "coder", content: "code", meta: { diff: "y" } };
   return { returnCode: 0, summary: "done" };
-}
+};
 `;
 
-const pauseResumeBundleSource = `export default async function* (input) {
+const pauseResumeBundleSource = `${threadFixtureDescriptor}
+export const run = async function* (input) {
   yield { role: "first", content: "f", meta: {} };
   await new Promise((r) => setTimeout(r, 1500));
   yield { role: "second", content: "s", meta: {} };
   return { returnCode: 0, summary: "done" };
-}
+};
 `;
 
-const delayedFirstYieldBundleSource = `export default async function* (input) {
+const delayedFirstYieldBundleSource = `${threadFixtureDescriptor}
+export const run = async function* (input) {
   await new Promise((r) => setTimeout(r, 900));
   yield { role: "only", content: "x", meta: {} };
   return { returnCode: 0, summary: "done" };
-}
+};
 `;
 
 async function countDataJsonlLines(dataPath: string): Promise<number> {
@@ -113,7 +131,6 @@ describe("cli thread commands", () => {
     await mkdir(bundleDir, { recursive: true });
     const bundlePath = join(bundleDir, "demo.esm.js");
     await writeFile(bundlePath, fastBundleSource, "utf8");
-    await writeFile(join(bundleDir, "demo.yaml"), MINIMAL_DESCRIPTOR_YAML, "utf8");
 
     const added = await cmdAdd(storageRoot, addCliArgs("solve-issue", bundlePath));
     expect(added.ok).toBe(true);
@@ -175,7 +192,6 @@ describe("cli thread commands", () => {
     await mkdir(bundleDir, { recursive: true });
     const bundlePath = join(bundleDir, "demo.esm.js");
     await writeFile(bundlePath, slowPlannerBundleSource, "utf8");
-    await writeFile(join(bundleDir, "demo.yaml"), MINIMAL_DESCRIPTOR_YAML, "utf8");
 
     const added = await cmdAdd(storageRoot, addCliArgs("solve-issue", bundlePath));
     expect(added.ok).toBe(true);
@@ -206,7 +222,6 @@ describe("cli thread commands", () => {
     await mkdir(bundleDir, { recursive: true });
     const bundlePath = join(bundleDir, "demo.esm.js");
     await writeFile(bundlePath, abortablePlannerBundleSource, "utf8");
-    await writeFile(join(bundleDir, "demo.yaml"), MINIMAL_DESCRIPTOR_YAML, "utf8");
 
     const added = await cmdAdd(storageRoot, addCliArgs("solve-issue", bundlePath));
     expect(added.ok).toBe(true);
@@ -246,7 +261,6 @@ describe("cli thread commands", () => {
     await mkdir(bundleDir, { recursive: true });
     const bundlePath = join(bundleDir, "demo.esm.js");
     await writeFile(bundlePath, pauseResumeBundleSource, "utf8");
-    await writeFile(join(bundleDir, "demo.yaml"), MINIMAL_DESCRIPTOR_YAML, "utf8");
 
     const added = await cmdAdd(storageRoot, addCliArgs("solve-issue", bundlePath));
     expect(added.ok).toBe(true);
@@ -288,7 +302,6 @@ describe("cli thread commands", () => {
     await mkdir(bundleDir, { recursive: true });
     const bundlePath = join(bundleDir, "demo.esm.js");
     await writeFile(bundlePath, fastBundleSource, "utf8");
-    await writeFile(join(bundleDir, "demo.yaml"), MINIMAL_DESCRIPTOR_YAML, "utf8");
 
     const added = await cmdAdd(storageRoot, addCliArgs("solve-issue", bundlePath));
     expect(added.ok).toBe(true);
@@ -318,7 +331,6 @@ describe("cli thread commands", () => {
     await mkdir(bundleDir, { recursive: true });
     const bundlePath = join(bundleDir, "demo.esm.js");
     await writeFile(bundlePath, delayedFirstYieldBundleSource, "utf8");
-    await writeFile(join(bundleDir, "demo.yaml"), MINIMAL_DESCRIPTOR_YAML, "utf8");
 
     const added = await cmdAdd(storageRoot, addCliArgs("solve-issue", bundlePath));
     expect(added.ok).toBe(true);

packages/cli-workflow/src/add-argv.ts

@@ -1,92 +0,0 @@
-import { err, ok, type Result } from "@uncaged/workflow";
-
-export type ParsedAddArgv = {
-  name: string;
-  filePath: string;
-  /** Override path to descriptor YAML when adding an `.esm.js` bundle. */
-  descriptorPath: string | null;
-  /** Override path to `.d.ts` when adding an `.esm.js` bundle. */
-  typesPath: string | null;
-};
-
-type ParsedLongFlag =
-  | { advance: 2; kind: "descriptor"; value: string }
-  | { advance: 2; kind: "types"; value: string };
-
-type PositionalSlots = {
-  name: string | undefined;
-  filePath: string | undefined;
-};
-
-function assignPositional(tok: string, slots: PositionalSlots): Result<void, string> {
-  if (slots.name === undefined) {
-    slots.name = tok;
-    return ok(undefined);
-  }
-  if (slots.filePath === undefined) {
-    slots.filePath = tok;
-    return ok(undefined);
-  }
-  return err("too many arguments");
-}
-
-function tryParseAddLongFlag(argv: string[], index: number): Result<ParsedLongFlag | null, string> {
-  const tok = argv[index];
-  if (tok !== "--descriptor" && tok !== "--types") {
-    return ok(null);
-  }
-  const value = argv[index + 1];
-  if (value === undefined || value.startsWith("--")) {
-    return err(
-      tok === "--descriptor" ? "missing value for --descriptor" : "missing value for --types",
-    );
-  }
-  if (tok === "--descriptor") {
-    return ok({ advance: 2, kind: "descriptor", value });
-  }
-  return ok({ advance: 2, kind: "types", value });
-}
-
-export function parseAddArgv(argv: string[]): Result<ParsedAddArgv, string> {
-  const slots: PositionalSlots = { name: undefined, filePath: undefined };
-  let descriptorPath: string | null = null;
-  let typesPath: string | null = null;
-
-  let i = 0;
-  while (i < argv.length) {
-    const flag = tryParseAddLongFlag(argv, i);
-    if (!flag.ok) {
-      return flag;
-    }
-    if (flag.value !== null) {
-      const f = flag.value;
-      if (f.kind === "descriptor") {
-        descriptorPath = f.value;
-      } else {
-        typesPath = f.value;
-      }
-      i += f.advance;
-      continue;
-    }
-
-    const tok = argv[i];
-    if (tok?.startsWith("--")) {
-      return err(`unknown add flag: ${tok}`);
-    }
-    if (tok === undefined) {
-      break;
-    }
-    const placed = assignPositional(tok, slots);
-    if (!placed.ok) {
-      return placed;
-    }
-    i += 1;
-  }
-
-  const { name, filePath } = slots;
-  if (name === undefined || name === "" || filePath === undefined || filePath === "") {
-    return err("add requires <name> <file>");
-  }
-
-  return ok({ name, filePath, descriptorPath, typesPath });
-}

packages/cli-workflow/src/cli-dispatch.ts

@@ -1,6 +1,5 @@
-import { parseAddArgv } from "./add-argv.js";
 import { printCliError, printCliLine, printCliWarn } from "./cli-output.js";
-import { cmdAdd, formatAddSuccess } from "./cmd-add.js";
+import { cmdAdd, formatAddSuccess, parseAddArgv } from "./cmd-add.js";
 import { cmdFork, parseForkArgv } from "./cmd-fork.js";
 import { cmdHistory } from "./cmd-history.js";
 import { cmdKill } from "./cmd-kill.js";
@@ -19,7 +18,7 @@ import { parseRunArgv } from "./run-argv.js";
 function usage(): string {
   return [
     "Usage:",
-    "  uncaged-workflow add <name> <file> [--descriptor <path>] [--types <path>]",
+    "  uncaged-workflow add <name> <file.esm.js> [--types <path>]",
     "  uncaged-workflow list",
     "  uncaged-workflow show <name>",
     "  uncaged-workflow remove <name>",

packages/cli-workflow/src/cmd-add.ts

@@ -2,42 +2,110 @@ import { readFile, stat } from "node:fs/promises";
 import { basename, resolve } from "node:path";
 
 import {
-  buildWorkflowFromTypeScript,
   err,
+  extractBundleExports,
   hashWorkflowBundleBytes,
   ok,
   type Result,
   readWorkflowRegistry,
   registerWorkflowVersion,
+  stringifyWorkflowDescriptor,
   validateWorkflowBundle,
   writeWorkflowRegistry,
 } from "@uncaged/workflow";
 
-import type { ParsedAddArgv } from "./add-argv.js";
 import { storeWorkflowBundleArtifacts } from "./bundle-store.js";
 import { validateCliWorkflowName } from "./workflow-name.js";
 
+export type ParsedAddArgv = {
+  name: string;
+  filePath: string;
+  /** Override path to `.d.ts` when adding a bundle. */
+  typesPath: string | null;
+};
+
 export type CmdAddSuccess = {
   hash: string;
   warnings: ReadonlyArray<string>;
 };
 
-function isTypeScriptWorkflow(path: string): boolean {
-  return path.endsWith(".ts");
-}
-
 function isEsmBundle(path: string): boolean {
   return path.endsWith(".esm.js");
 }
 
-function defaultDescriptorPath(bundlePath: string): string {
-  return bundlePath.replace(/\.esm\.js$/i, ".yaml");
-}
-
 function defaultTypesPath(bundlePath: string): string {
   return bundlePath.replace(/\.esm\.js$/i, ".d.ts");
 }
 
+type ParsedLongFlag = { advance: 2; kind: "types"; value: string };
+
+function tryParseAddLongFlag(argv: string[], index: number): Result<ParsedLongFlag | null, string> {
+  const tok = argv[index];
+  if (tok !== "--types") {
+    return ok(null);
+  }
+  const value = argv[index + 1];
+  if (value === undefined || value.startsWith("--")) {
+    return err("missing value for --types");
+  }
+  return ok({ advance: 2, kind: "types", value });
+}
+
+type PositionalSlots = {
+  name: string | undefined;
+  filePath: string | undefined;
+};
+
+function assignPositional(tok: string, slots: PositionalSlots): Result<void, string> {
+  if (slots.name === undefined) {
+    slots.name = tok;
+    return ok(undefined);
+  }
+  if (slots.filePath === undefined) {
+    slots.filePath = tok;
+    return ok(undefined);
+  }
+  return err("too many arguments");
+}
+
+export function parseAddArgv(argv: string[]): Result<ParsedAddArgv, string> {
+  const slots: PositionalSlots = { name: undefined, filePath: undefined };
+  let typesPath: string | null = null;
+
+  let i = 0;
+  while (i < argv.length) {
+    const flag = tryParseAddLongFlag(argv, i);
+    if (!flag.ok) {
+      return flag;
+    }
+    if (flag.value !== null) {
+      typesPath = flag.value.value;
+      i += flag.value.advance;
+      continue;
+    }
+
+    const tok = argv[i];
+    if (tok?.startsWith("--")) {
+      return err(`unknown add flag: ${tok}`);
+    }
+    if (tok === undefined) {
+      break;
+    }
+    const placed = assignPositional(tok, slots);
+    if (!placed.ok) {
+      return placed;
+    }
+    i += 1;
+  }
+
+  const { name, filePath } = slots;
+  if (name === undefined || name === "" || filePath === undefined || filePath === "") {
+    return err("add requires <name> <file>");
+  }
+
+  return ok({ name, filePath, typesPath });
+}
+
 async function registerHash(
   storageRoot: string,
   name: string,
@@ -56,125 +124,31 @@ async function registerHash(
   return ok(undefined);
 }
 
-async function addFromTypeScript(
+async function resolveOptionalTypes(
-  storageRoot: string,
+  typesPathFlag: string | null,
-  workflowName: string,
-  resolvedTsPath: string,
-): Promise<Result<CmdAddSuccess, string>> {
-  const built = await buildWorkflowFromTypeScript(resolvedTsPath);
-  if (!built.ok) {
-    return built;
-  }
-
-  const encoder = new TextEncoder();
-  const bytes = encoder.encode(built.value.esmJsSource);
-  const hash = hashWorkflowBundleBytes(bytes);
-
-  const stored = await storeWorkflowBundleArtifacts(storageRoot, hash, {
-    esmJs: { kind: "text", text: built.value.esmJsSource },
-    yaml: { kind: "text", text: built.value.yamlSource },
-    dts: { kind: "text", text: built.value.dtsSource },
-  });
-  if (!stored.ok) {
-    return stored;
-  }
-
-  const regResult = await registerHash(storageRoot, workflowName, hash);
-  if (!regResult.ok) {
-    return regResult;
-  }
-
-  return ok({ hash, warnings: [] });
-}
-
-async function resolveYamlAndOptionalTypes(
-  args: ParsedAddArgv,
   resolvedBundlePath: string,
-): Promise<Result<{ yamlText: string; dtsText: string | null; warnings: string[] }, string>> {
+): Promise<Result<{ dtsText: string | null; warnings: string[] }, string>> {
   const warnings: string[] = [];
-  const yamlResolved =
-    args.descriptorPath !== null
-      ? resolve(args.descriptorPath)
-      : defaultDescriptorPath(resolvedBundlePath);
-
-  let yamlText: string;
-  try {
-    yamlText = await readFile(yamlResolved, "utf8");
-  } catch {
-    return err(`descriptor YAML not found: ${yamlResolved}`);
-  }
-
   let dtsText: string | null = null;
-  if (args.typesPath !== null) {
+
-    const typesResolved = resolve(args.typesPath);
+  if (typesPathFlag !== null) {
+    const typesResolved = resolve(typesPathFlag);
     try {
       dtsText = await readFile(typesResolved, "utf8");
     } catch {
       return err(`types file not found: ${typesResolved}`);
     }
-  } else {
+    return ok({ dtsText, warnings });
+  }
+
   const typesDefault = defaultTypesPath(resolvedBundlePath);
   try {
     dtsText = await readFile(typesDefault, "utf8");
   } catch {
     warnings.push(`optional types file not found (${basename(typesDefault)}); skipped`);
   }
-  }
 
-  return ok({ yamlText, dtsText, warnings });
+  return ok({ dtsText, warnings });
-}
-
-async function addFromEsmJs(
-  storageRoot: string,
-  workflowName: string,
-  args: ParsedAddArgv,
-  resolvedBundlePath: string,
-): Promise<Result<CmdAddSuccess, string>> {
-  let source: string;
-  try {
-    source = await readFile(resolvedBundlePath, "utf8");
-  } catch (e) {
-    const message = e instanceof Error ? e.message : String(e);
-    return err(`failed to read bundle: ${message}`);
-  }
-
-  const validated = validateWorkflowBundle({
-    filePath: resolvedBundlePath,
-    source,
-  });
-  if (!validated.ok) {
-    return validated;
-  }
-
-  const companions = await resolveYamlAndOptionalTypes(args, resolvedBundlePath);
-  if (!companions.ok) {
-    return companions;
-  }
-
-  const encoder = new TextEncoder();
-  const bytes = encoder.encode(source);
-  const hash = hashWorkflowBundleBytes(bytes);
-
-  const dts =
-    companions.value.dtsText === null
-      ? null
-      : { kind: "text" as const, text: companions.value.dtsText };
-
-  const stored = await storeWorkflowBundleArtifacts(storageRoot, hash, {
-    esmJs: { kind: "text", text: source },
-    yaml: { kind: "text", text: companions.value.yamlText },
-    dts,
-  });
-  if (!stored.ok) {
-    return stored;
-  }
-
-  const regResult = await registerHash(storageRoot, workflowName, hash);
-  if (!regResult.ok) {
-    return regResult;
-  }
-
-  return ok({ hash, warnings: companions.value.warnings });
 }
 
 export async function cmdAdd(
@@ -194,15 +168,66 @@ export async function cmdAdd(
     return err(`file not found: ${args.filePath}`);
   }
 
-  if (isTypeScriptWorkflow(resolvedPath)) {
+  if (resolvedPath.endsWith(".ts")) {
-    return addFromTypeScript(storageRoot, args.name, resolvedPath);
+    return err("build your .ts file first, then add the .esm.js");
   }
 
   if (!isEsmBundle(resolvedPath)) {
-    return err('workflow file must be ".ts" or end with ".esm.js"');
+    return err('workflow file must end with ".esm.js"');
   }
 
-  return addFromEsmJs(storageRoot, args.name, args, resolvedPath);
+  let source: string;
+  try {
+    source = await readFile(resolvedPath, "utf8");
+  } catch (e) {
+    const message = e instanceof Error ? e.message : String(e);
+    return err(`failed to read bundle: ${message}`);
+  }
+
+  const validated = validateWorkflowBundle({
+    filePath: resolvedPath,
+    source,
+  });
+  if (!validated.ok) {
+    return validated;
+  }
+
+  const extracted = await extractBundleExports(resolvedPath);
+  if (!extracted.ok) {
+    return extracted;
+  }
+
+  const yamlSource = stringifyWorkflowDescriptor(extracted.value.descriptor);
+
+  const companions = await resolveOptionalTypes(args.typesPath, resolvedPath);
+  if (!companions.ok) {
+    return companions;
+  }
+
+  const encoder = new TextEncoder();
+  const bytes = encoder.encode(source);
+  const hash = hashWorkflowBundleBytes(bytes);
+
+  const dts =
+    companions.value.dtsText === null
+      ? null
+      : { kind: "text" as const, text: companions.value.dtsText };
+
+  const stored = await storeWorkflowBundleArtifacts(storageRoot, hash, {
+    esmJs: { kind: "text", text: source },
+    yaml: { kind: "text", text: yamlSource },
+    dts,
+  });
+  if (!stored.ok) {
+    return stored;
+  }
+
+  const regResult = await registerHash(storageRoot, args.name, hash);
+  if (!regResult.ok) {
+    return regResult;
+  }
+
+  return ok({ hash, warnings: companions.value.warnings });
 }
 
 export function formatAddSuccess(name: string, filePath: string, hash: string): string {

packages/workflow/__tests__/build-pipeline.test.ts

@@ -1,34 +0,0 @@
-import { describe, expect, test } from "bun:test";
-import { mkdtemp, rm, writeFile } from "node:fs/promises";
-import { tmpdir } from "node:os";
-import { dirname, join } from "node:path";
-import { fileURLToPath, pathToFileURL } from "node:url";
-
-import { buildWorkflowFromTypeScript } from "../src/build-pipeline.js";
-
-describe("buildWorkflowFromTypeScript", () => {
-  test("produces ESM + YAML + d.ts and the bundle default export runs", async () => {
-    const thisFile = fileURLToPath(import.meta.url);
-    const entryTs = join(dirname(thisFile), "fixtures/minimal-build-workflow.ts");
-
-    const r = await buildWorkflowFromTypeScript(entryTs);
-    expect(r.ok).toBe(true);
-    if (!r.ok) {
-      return;
-    }
-    expect(r.value.esmJsSource.length).toBeGreaterThan(200);
-    expect(r.value.yamlSource).toContain("minimal fixture");
-    expect(r.value.dtsSource).toContain("r:");
-    expect(r.value.dtsSource).toContain("x: string");
-
-    const dir = await mkdtemp(join(tmpdir(), "uncaged-wf-build-"));
-    try {
-      const out = join(dir, "workflow.esm.js");
-      await writeFile(out, r.value.esmJsSource, "utf8");
-      const mod = (await import(pathToFileURL(out).href)) as { default: unknown };
-      expect(typeof mod.default).toBe("function");
-    } finally {
-      await rm(dir, { recursive: true, force: true });
-    }
-  });
-});

packages/workflow/__tests__/bundle-validator.test.ts

@@ -2,22 +2,25 @@ import { describe, expect, test } from "bun:test";
 
 import { validateWorkflowBundle } from "../src/bundle-validator.js";
 
+const minimalDescriptor = `export const descriptor = { description: "x", roles: {} };
+`;
+
 describe("validateWorkflowBundle", () => {
-  test("accepts export { local as default } when local is a call expression result", () => {
+  test("accepts export { local as run } when local is a call expression result", () => {
-    const source = `var wf = createFn({});
+    const source = `${minimalDescriptor}var wf = createFn({});
-export { wf as default };
+export { wf as run };
 `;
     const r = validateWorkflowBundle({ filePath: "/tmp/w.esm.js", source });
     expect(r.ok).toBe(true);
   });
 
   test("accepts minimal valid builtin-only bundle", () => {
-    const source = `import fs from "node:fs";
+    const source = `${minimalDescriptor}import fs from "node:fs";
 
-export default async function* (input) {
+export const run = async function* (input) {
   fs.existsSync(".");
   return { returnCode: 0, summary: input.prompt };
-}
+};
 `;
     const r = validateWorkflowBundle({ filePath: "/tmp/w.esm.js", source });
     expect(r.ok).toBe(true);
@@ -26,27 +29,15 @@ export default async function* (input) {
   test("rejects wrong filename suffix", () => {
     const r = validateWorkflowBundle({
       filePath: "/tmp/w.js",
-      source:
+      source: `${minimalDescriptor}export const run = async function* (input) { return { returnCode: 0, summary: input.prompt }; }\n`,
-        "export default async function* (input) { return { returnCode: 0, summary: input.prompt }; }\n",
     });
     expect(r.ok).toBe(false);
   });
 
-  test("rejects default export that is not a callable bundle shape", () => {
+  test("rejects default export", () => {
     const r = validateWorkflowBundle({
       filePath: "/tmp/w.esm.js",
-      source: 'export default { name: "x", roles: {}, moderator() { return "__end__"; } };\n',
+      source: `${minimalDescriptor}export default async function* (input) { return { returnCode: 0, summary: input.prompt }; }\n`,
-    });
-    expect(r.ok).toBe(false);
-    if (!r.ok) {
-      expect(r.error).toContain("default export must be a function");
-    }
-  });
-
-  test("rejects missing default export", () => {
-    const r = validateWorkflowBundle({
-      filePath: "/tmp/w.esm.js",
-      source: "export const x = 1;\n",
     });
     expect(r.ok).toBe(false);
     if (!r.ok) {
@@ -54,11 +45,49 @@ export default async function* (input) {
     }
   });
 
+  test("rejects run export that is not a callable bundle shape", () => {
+    const r = validateWorkflowBundle({
+      filePath: "/tmp/w.esm.js",
+      source: `${minimalDescriptor}export const run = { x: 1 };
+`,
+    });
+    expect(r.ok).toBe(false);
+    if (!r.ok) {
+      expect(r.error).toContain("run");
+    }
+  });
+
+  test("rejects missing run export", () => {
+    const r = validateWorkflowBundle({
+      filePath: "/tmp/w.esm.js",
+      source: `${minimalDescriptor}export const x = 1;\n`,
+    });
+    expect(r.ok).toBe(false);
+    if (!r.ok) {
+      expect(r.error).toContain("run");
+    }
+  });
+
+  test("rejects missing descriptor export", () => {
+    const r = validateWorkflowBundle({
+      filePath: "/tmp/w.esm.js",
+      source: `export const run = async function* (input) {
+  return { returnCode: 0, summary: input.prompt };
+};
+`,
+    });
+    expect(r.ok).toBe(false);
+    if (!r.ok) {
+      expect(r.error).toContain("descriptor");
+    }
+  });
+
   test("rejects non-builtin imports", () => {
     const r = validateWorkflowBundle({
       filePath: "/tmp/w.esm.js",
-      source:
+      source: `${minimalDescriptor}import x from "some-package";
-        'import x from "some-package";\nexport default async function* (input) { return { returnCode: 0, summary: input.prompt }; }\n',
+export const run = async function* (input) { return { returnCode: 0, summary: input.prompt }; }
+`,
     });
     expect(r.ok).toBe(false);
   });
@@ -66,8 +95,8 @@ export default async function* (input) {
   test("rejects dynamic import", () => {
     const r = validateWorkflowBundle({
       filePath: "/tmp/w.esm.js",
-      source:
+      source: `${minimalDescriptor}export const run = async function* (input) { await import("fs"); return { returnCode: 0, summary: input.prompt }; }
-        'export default async function* (input) { await import("fs"); return { returnCode: 0, summary: input.prompt }; }\n',
+`,
     });
     expect(r.ok).toBe(false);
     if (!r.ok) {
@@ -78,8 +107,8 @@ export default async function* (input) {
   test("rejects require()", () => {
     const r = validateWorkflowBundle({
       filePath: "/tmp/w.esm.js",
-      source:
+      source: `${minimalDescriptor}export const run = async function* (input) { require("fs"); return { returnCode: 0, summary: input.prompt }; }
-        'export default async function* (input) { require("fs"); return { returnCode: 0, summary: input.prompt }; }\n',
+`,
     });
     expect(r.ok).toBe(false);
   });

packages/workflow/__tests__/fixtures/minimal-build-workflow.ts

@@ -1,30 +0,0 @@
-import { createRoleModerator } from "../../src/create-role-moderator.js";
-import { END, type Role } from "../../src/types.js";
-
-type RMeta = { x: string };
-
-export const descriptor = {
-  description: "minimal fixture workflow for build-pipeline tests",
-  roles: {
-    r: {
-      description: "single role",
-      schema: {
-        type: "object",
-        properties: { x: { type: "string" } },
-        required: ["x"],
-      },
-    },
-  },
-};
-
-const r: Role<RMeta> = async () => ({
-  content: "",
-  meta: { x: "y" },
-});
-
-export default createRoleModerator({
-  roles: { r },
-  moderator() {
-    return END;
-  },
-});

packages/workflow/__tests__/hash.test.ts

@@ -17,7 +17,9 @@ describe("hashWorkflowBundleBytes", () => {
   test("stable for identical content", () => {
     const encoder = new TextEncoder();
     const data = encoder.encode(
-      "export default async function* (input) { return { returnCode: 0, summary: input.prompt }; }\n",
+      `export const descriptor = { description: "x", roles: {} };
+export const run = async function* (input) { return { returnCode: 0, summary: input.prompt }; }
+`,
     );
     expect(hashWorkflowBundleBytes(data)).toBe(hashWorkflowBundleBytes(data));
   });

packages/workflow/__tests__/json-schema-to-ts.test.ts

@@ -1,37 +0,0 @@
-import { describe, expect, test } from "bun:test";
-
-import { jsonSchemaToTypeString } from "../src/json-schema-to-ts.js";
-
-describe("jsonSchemaToTypeString", () => {
-  test("maps primitives and object required fields", () => {
-    const schema = {
-      type: "object",
-      properties: {
-        plan: { type: "string" },
-        files: { type: "array", items: { type: "string" } },
-      },
-      required: ["plan", "files"],
-    };
-    expect(jsonSchemaToTypeString(schema)).toBe("{ plan: string; files: string[] }");
-  });
-
-  test("marks non-required object properties as nullable union", () => {
-    const schema = {
-      type: "object",
-      properties: {
-        n: { type: "number" },
-      },
-      required: [],
-    };
-    expect(jsonSchemaToTypeString(schema)).toBe("{ n: number | null }");
-  });
-
-  test("handles boolean and integer", () => {
-    expect(jsonSchemaToTypeString({ type: "boolean" })).toBe("boolean");
-    expect(jsonSchemaToTypeString({ type: "integer" })).toBe("number");
-  });
-
-  test("handles enum as literal union", () => {
-    expect(jsonSchemaToTypeString({ enum: ["a", "b"] })).toBe(`"a" | "b"`);
-  });
-});

packages/workflow/__tests__/worker.test.ts

@@ -7,7 +7,14 @@ import { join } from "node:path";
 
 import { getWorkerHostScriptPath } from "../src/worker-entry-path.js";
 
-const bundleSource = `export default async function* (input) {
+const bundleSource = `export const descriptor = {
+  description: "worker-test",
+  roles: {
+    planner: { description: "planner", schema: {} },
+    coder: { description: "coder", schema: {} },
+  },
+};
+export const run = async function* (input) {
   const has = (r) => input.steps.some((s) => s.role === r);
   if (!has("planner")) {
     yield { role: "planner", content: "p", meta: { plan: input.prompt } };
@@ -16,7 +23,7 @@ const bundleSource = `export default async function* (input) {
     yield { role: "coder", content: "c", meta: { diff: "y" } };
   }
   return { returnCode: 0, summary: "completed: moderator returned END" };
-}
+};
 `;
 
 async function readReadyPort(child: import("node:child_process").ChildProcess): Promise<number> {

packages/workflow/src/build-pipeline.ts

@@ -1,119 +0,0 @@
-import { access, constants } from "node:fs/promises";
-import { dirname, join } from "node:path";
-import { pathToFileURL } from "node:url";
-
-import { validateWorkflowBundle } from "./bundle-validator.js";
-import { stringifyWorkflowDescriptor } from "./generate-descriptor.js";
-import { generateWorkflowBundleTypes } from "./generate-types.js";
-import { err, ok, type Result } from "./result.js";
-import { validateWorkflowDescriptor } from "./workflow-descriptor.js";
-
-export type BuildPipelineResult = {
-  esmJsSource: string;
-  yamlSource: string;
-  dtsSource: string;
-};
-
-async function findPackageRoot(startDir: string): Promise<string> {
-  let dir = startDir;
-  for (;;) {
-    try {
-      await access(join(dir, "package.json"), constants.R_OK);
-      return dir;
-    } catch {
-      const parent = dirname(dir);
-      if (parent === dir) {
-        return startDir;
-      }
-      dir = parent;
-    }
-  }
-}
-
-async function loadDescriptorFromSourceTs(
-  absoluteTsPath: string,
-): Promise<Result<WorkflowDescriptor, string>> {
-  let mod: Record<string, unknown>;
-  try {
-    const href = pathToFileURL(absoluteTsPath).href;
-    // Dynamic import required: user workflow source path resolved at add/build time
-    mod = (await import(href)) as Record<string, unknown>;
-  } catch (e) {
-    const message = e instanceof Error ? e.message : String(e);
-    return err(`failed to import workflow source for descriptor: ${message}`);
-  }
-
-  const raw = mod.descriptor;
-  return validateWorkflowDescriptor(raw);
-}
-
-/**
- * Bundle a `.ts` workflow entry with Bun, read `export const descriptor`, and emit
- * companion YAML + `.d.ts` text alongside validated ESM bundle source.
- */
-export async function buildWorkflowFromTypeScript(
-  absoluteTsPath: string,
-): Promise<Result<BuildPipelineResult, string>> {
-  let rootDir: string;
-  try {
-    rootDir = await findPackageRoot(dirname(absoluteTsPath));
-  } catch (e) {
-    const message = e instanceof Error ? e.message : String(e);
-    return err(`failed to resolve package root: ${message}`);
-  }
-
-  let buildResult: Awaited<ReturnType<typeof Bun.build>>;
-  try {
-    buildResult = await Bun.build({
-      entrypoints: [absoluteTsPath],
-      target: "node",
-      format: "esm",
-      external: ["node:*"],
-      root: rootDir,
-    });
-  } catch (e) {
-    const message = e instanceof Error ? e.message : String(e);
-    return err(`Bun.build failed: ${message}`);
-  }
-
-  if (!buildResult.success) {
-    const logs = buildResult.logs.map((l) => l.message).join("; ");
-    return err(`Bun.build failed: ${logs || "unknown error"}`);
-  }
-
-  const entry = buildResult.outputs.find((o) => o.kind === "entry-point");
-  if (entry === undefined) {
-    return err("Bun.build produced no entry-point output");
-  }
-
-  let esmJsSource: string;
-  try {
-    esmJsSource = await entry.text();
-  } catch (e) {
-    const message = e instanceof Error ? e.message : String(e);
-    return err(`failed to read bundle output: ${message}`);
-  }
-
-  const descriptorLoaded = await loadDescriptorFromSourceTs(absoluteTsPath);
-  if (!descriptorLoaded.ok) {
-    return descriptorLoaded;
-  }
-  const descriptor = descriptorLoaded.value;
-
-  const validated = validateWorkflowBundle({
-    filePath: joinVirtualEsmPath(absoluteTsPath),
-    source: esmJsSource,
-  });
-  if (!validated.ok) {
-    return validated;
-  }
-
-  const yamlSource = stringifyWorkflowDescriptor(descriptor);
-  const dtsSource = generateWorkflowBundleTypes(descriptor);
-
-  return ok({ esmJsSource, yamlSource, dtsSource });
-}
-
-function joinVirtualEsmPath(absoluteTsPath: string): string {
-  return `${absoluteTsPath}.esm.js`;
-}

packages/workflow/src/bundle-validator.ts

@@ -2,7 +2,6 @@ import { isBuiltin } from "node:module";
 import type {
   CallExpression,
   ExportAllDeclaration,
-  ExportDefaultDeclaration,
   ExportNamedDeclaration,
   ExportSpecifier,
   FunctionDeclaration,
@@ -69,54 +68,34 @@ function walkAst(node: Node, visit: (n: Node) => void): void {
   }
 }
 
-function exportSpecifierIsDefaultReExport(spec: ExportSpecifier): boolean {
+function exportSpecifierExportedName(spec: ExportSpecifier): string | null {
-  return spec.exported.type === "Identifier" && spec.exported.name === "default";
+  if (spec.exported.type !== "Identifier") {
+    return null;
+  }
+  return spec.exported.name;
 }
 
-function exportNamedDeclarationOffersDefault(named: ExportNamedDeclaration): boolean {
+function exportNamedDeclReExportsDefault(named: ExportNamedDeclaration): boolean {
   if (named.source !== null && named.source !== undefined) {
     return false;
   }
   return named.specifiers.some(
-    (spec) => spec.type === "ExportSpecifier" && exportSpecifierIsDefaultReExport(spec),
+    (spec) => spec.type === "ExportSpecifier" && exportSpecifierExportedName(spec) === "default",
   );
 }
 
-function programHasDefaultExport(body: readonly Node[]): boolean {
+function programUsesDefaultExport(program: Program): boolean {
-  for (const stmt of body) {
+  for (const stmt of program.body) {
     if (stmt.type === "ExportDefaultDeclaration") {
       return true;
     }
-    if (stmt.type === "ExportNamedDeclaration" && exportNamedDeclarationOffersDefault(stmt)) {
+    if (stmt.type === "ExportNamedDeclaration" && exportNamedDeclReExportsDefault(stmt)) {
       return true;
     }
   }
   return false;
 }
 
-function findDefaultExportLocalBindingName(program: Program): string | null {
-  for (const stmt of program.body) {
-    if (stmt.type !== "ExportNamedDeclaration") {
-      continue;
-    }
-    const named = stmt as ExportNamedDeclaration;
-    if (named.source !== null && named.source !== undefined) {
-      continue;
-    }
-    for (const spec of named.specifiers) {
-      if (spec.type !== "ExportSpecifier" || !exportSpecifierIsDefaultReExport(spec)) {
-        continue;
-      }
-      const loc = spec.local;
-      if (loc.type !== "Identifier") {
-        return null;
-      }
-      return loc.name;
-    }
-  }
-  return null;
-}
-
 function bindingInitializerIsCallable(init: Node): boolean {
   return (
     init.type === "FunctionExpression" ||
@@ -157,32 +136,142 @@ function programDeclaresCallableExportBinding(program: Program, name: string): b
   return false;
 }
 
-function defaultExportDeclarationIsCallable(program: Program): boolean {
+function namedExportDeclExportsRunCallable(named: ExportNamedDeclaration): boolean {
-  for (const stmt of program.body) {
+  const decl = named.declaration;
-    if (stmt.type !== "ExportDefaultDeclaration") {
+  if (decl === null || decl === undefined) {
-      continue;
+    return false;
   }
-    const decl = (stmt as ExportDefaultDeclaration).declaration;
+  if (decl.type === "FunctionDeclaration") {
-    if (
+    const id = decl.id;
-      decl.type === "FunctionDeclaration" ||
+    return id !== null && id !== undefined && id.type === "Identifier" && id.name === "run";
-      decl.type === "FunctionExpression" ||
-      decl.type === "ArrowFunctionExpression"
-    ) {
-      return true;
   }
-    if (decl.type === "CallExpression") {
+  if (decl.type === "VariableDeclaration") {
-      return true;
+    return variableDeclarationBindsCallableName(decl, "run");
   }
   return false;
 }
 
-  const exportBinding = findDefaultExportLocalBindingName(program);
+function findRunExportLocalBindingName(program: Program): string | null {
+  for (const stmt of program.body) {
+    if (stmt.type !== "ExportNamedDeclaration") {
+      continue;
+    }
+    const named = stmt as ExportNamedDeclaration;
+    if (named.source !== null && named.source !== undefined) {
+      continue;
+    }
+    for (const spec of named.specifiers) {
+      if (spec.type !== "ExportSpecifier" || exportSpecifierExportedName(spec) !== "run") {
+        continue;
+      }
+      const loc = spec.local;
+      if (loc.type !== "Identifier") {
+        return null;
+      }
+      return loc.name;
+    }
+  }
+  return null;
+}
+
+function runExportIsCallable(program: Program): boolean {
+  for (const stmt of program.body) {
+    if (stmt.type === "ExportNamedDeclaration") {
+      const named = stmt as ExportNamedDeclaration;
+      if (namedExportDeclExportsRunCallable(named)) {
+        return true;
+      }
+    }
+  }
+
+  const exportBinding = findRunExportLocalBindingName(program);
   if (exportBinding !== null) {
     return programDeclaresCallableExportBinding(program, exportBinding);
   }
   return false;
 }
 
+function namedExportDeclExportsDescriptor(named: ExportNamedDeclaration): boolean {
+  const decl = named.declaration;
+  if (decl === null || decl === undefined || decl.type !== "VariableDeclaration") {
+    return false;
+  }
+  for (const d of decl.declarations) {
+    if (d.id.type === "Identifier" && d.id.name === "descriptor") {
+      return true;
+    }
+  }
+  return false;
+}
+
+function functionDeclarationNamed(stmt: FunctionDeclaration, name: string): boolean {
+  const id = stmt.id;
+  return id !== null && id !== undefined && id.type === "Identifier" && id.name === name;
+}
+
+function variableDeclarationNames(stmt: VariableDeclaration, name: string): boolean {
+  for (const decl of stmt.declarations) {
+    if (decl.id.type === "Identifier" && decl.id.name === name) {
+      return true;
+    }
+  }
+  return false;
+}
+
+function programDeclaresBindingName(program: Program, name: string): boolean {
+  for (const stmt of program.body) {
+    if (
+      stmt.type === "FunctionDeclaration" &&
+      functionDeclarationNamed(stmt as FunctionDeclaration, name)
+    ) {
+      return true;
+    }
+    if (stmt.type === "VariableDeclaration" && variableDeclarationNames(stmt, name)) {
+      return true;
+    }
+  }
+  return false;
+}
+
+function findDescriptorExportLocalBindingName(program: Program): string | null {
+  for (const stmt of program.body) {
+    if (stmt.type !== "ExportNamedDeclaration") {
+      continue;
+    }
+    const named = stmt as ExportNamedDeclaration;
+    if (named.source !== null && named.source !== undefined) {
+      continue;
+    }
+    for (const spec of named.specifiers) {
+      if (spec.type !== "ExportSpecifier" || exportSpecifierExportedName(spec) !== "descriptor") {
+        continue;
+      }
+      const loc = spec.local;
+      if (loc.type !== "Identifier") {
+        return null;
+      }
+      return loc.name;
+    }
+  }
+  return null;
+}
+
+function descriptorExportExists(program: Program): boolean {
+  for (const stmt of program.body) {
+    if (stmt.type === "ExportNamedDeclaration") {
+      const named = stmt as ExportNamedDeclaration;
+      if (namedExportDeclExportsDescriptor(named)) {
+        return true;
+      }
+    }
+  }
+  const binding = findDescriptorExportLocalBindingName(program);
+  if (binding === null) {
+    return false;
+  }
+  return programDeclaresBindingName(program, binding);
+}
+
 function stringLiteralModuleSpecifier(src: Node): string | null {
   if (src.type !== "Literal" || typeof src.value !== "string") {
     return null;
@@ -263,8 +352,8 @@ function bundleConstraintViolationForNode(node: Node): string | null {
 }
 
 /**
- * Validate RFC-001 bundle rules: single-file ESM shape, default export,
+ * Validate RFC-001 bundle rules: single-file ESM shape, named exports `run` + `descriptor`,
- * no dynamic `import()`, static imports restricted to Node builtins.
+ * no default export, no dynamic `import()`, static imports restricted to Node builtins.
  */
 export function validateWorkflowBundle(input: WorkflowBundleValidationInput): Result<void, string> {
   if (!endsWithEsmJs(input.filePath)) {
@@ -288,13 +377,20 @@ export function validateWorkflowBundle(input: WorkflowBundleValidationInput): Re
   }
 
   const program = ast as Program;
-  if (!programHasDefaultExport(program.body)) {
+
-    return err("workflow bundle must have a default export");
+  if (programUsesDefaultExport(program)) {
+    return err('workflow bundle must not use default export; use "export const run" instead');
   }
 
-  if (!defaultExportDeclarationIsCallable(program)) {
+  if (!runExportIsCallable(program)) {
     return err(
-      "workflow bundle default export must be a function (e.g. async function*) or a call expression that returns one",
+      'workflow bundle must export run as a callable (e.g. "export const run = async function* (...)")',
+    );
+  }
+
+  if (!descriptorExportExists(program)) {
+    return err(
+      'workflow bundle must export descriptor (e.g. "export const descriptor = { description, roles }")',
     );
   }
 

packages/workflow/src/create-role-moderator.ts

@@ -20,7 +20,7 @@ function isRoleNext<M extends RoleMeta>(
 
 /**
  * Role + Moderator pattern as an optional helper: returns a {@link WorkflowFn} that runs the
- * moderator loop and yields each {@link RoleOutput}.
+ * moderator loop and yields each {@link RoleOutput}. Assign with `export const run = createRoleModerator(...)`.
  */
 export function createRoleModerator<M extends RoleMeta>(
   def: Pick<WorkflowDefinition<M>, "roles" | "moderator">,

packages/workflow/src/extract-bundle-exports.ts

@@ -0,0 +1,43 @@
+import { pathToFileURL } from "node:url";
+
+import { err, ok, type Result } from "./result.js";
+import type { WorkflowFn } from "./types.js";
+import type { WorkflowDescriptor } from "./workflow-descriptor.js";
+import { validateWorkflowDescriptor } from "./workflow-descriptor.js";
+
+export type ExtractedBundleExports = {
+  run: WorkflowFn;
+  descriptor: WorkflowDescriptor;
+};
+
+/** Load a workflow `.esm.js` bundle and read its named exports (`run`, `descriptor`). */
+export async function extractBundleExports(
+  bundlePath: string,
+): Promise<Result<ExtractedBundleExports, string>> {
+  let modUnknown: unknown;
+  try {
+    // Dynamic import required: user bundle path resolved at runtime
+    modUnknown = await import(pathToFileURL(bundlePath).href);
+  } catch (e) {
+    const message = e instanceof Error ? e.message : String(e);
+    return err(`failed to import bundle: ${message}`);
+  }
+
+  const modRec = modUnknown as Record<string, unknown>;
+  const defaultExport = modRec.default;
+  if (defaultExport !== undefined) {
+    return err("workflow bundle must not use default export; export const run instead");
+  }
+
+  const run = modRec.run;
+  if (typeof run !== "function") {
+    return err("workflow bundle must export run as a function");
+  }
+
+  const validated = validateWorkflowDescriptor(modRec.descriptor);
+  if (!validated.ok) {
+    return err(validated.error);
+  }
+
+  return ok({ run: run as WorkflowFn, descriptor: validated.value });
+}

packages/workflow/src/generate-types.ts

@@ -1,27 +0,0 @@
-import { jsonSchemaToTypeString } from "./json-schema-to-ts.js";
-import type { WorkflowDescriptor } from "./workflow-descriptor.js";
-
-function safePropertyName(name: string): string {
-  return /^[a-zA-Z_$][a-zA-Z0-9_$]*$/.test(name) ? name : JSON.stringify(name);
-}
-
-/** Build the standard workflow bundle `.d.ts` from role JSON Schemas. */
-export function generateWorkflowBundleTypes(descriptor: WorkflowDescriptor): string {
-  const roleLines: string[] = [];
-  for (const [roleName, role] of Object.entries(descriptor.roles)) {
-    const tsType = jsonSchemaToTypeString(role.schema);
-    roleLines.push(`  ${safePropertyName(roleName)}: ${tsType};`);
-  }
-
-  return [
-    `import type { WorkflowFn } from "@uncaged/workflow";`,
-    ``,
-    `export type Roles = {`,
-    ...roleLines,
-    `};`,
-    ``,
-    `declare const workflow: WorkflowFn;`,
-    `export default workflow;`,
-    ``,
-  ].join("\n");
-}

packages/workflow/src/index.ts

@@ -5,10 +5,6 @@ export {
   encodeCrockfordBase32Bits,
   encodeUint64AsCrockford,
 } from "./base32.js";
-export {
-  type BuildPipelineResult,
-  buildWorkflowFromTypeScript,
-} from "./build-pipeline.js";
 export { validateWorkflowBundle, type WorkflowBundleValidationInput } from "./bundle-validator.js";
 export { createRoleModerator } from "./create-role-moderator.js";
 export {
@@ -17,6 +13,7 @@ export {
   executeThread,
   type PrefilledDiskStep,
 } from "./engine.js";
+export { type ExtractedBundleExports, extractBundleExports } from "./extract-bundle-exports.js";
 export {
   buildForkPlan,
   type ForkHistoricalStep,
@@ -26,9 +23,7 @@ export {
   selectForkHistoricalSteps,
 } from "./fork-thread.js";
 export { stringifyWorkflowDescriptor } from "./generate-descriptor.js";
-export { generateWorkflowBundleTypes } from "./generate-types.js";
 export { hashWorkflowBundleBytes } from "./hash.js";
-export { jsonSchemaToTypeString } from "./json-schema-to-ts.js";
 export {
   type CreateLoggerOptions,
   createLogger,

packages/workflow/src/json-schema-to-ts.ts

@@ -1,108 +0,0 @@
-/**
- * Convert a JSON Schema subset (object / string / number / integer / boolean / array)
- * into a TypeScript type string for generated `.d.ts` files.
- */
-export function jsonSchemaToTypeString(schema: unknown): string {
-  return schemaToTs(schema);
-}
-
-function schemaEnumToTs(record: Record<string, unknown>): string | null {
-  const en = record.enum;
-  if (!Array.isArray(en) || en.length === 0) {
-    return null;
-  }
-  const literals = en
-    .filter((v): v is string | number | boolean => v !== null && v !== undefined)
-    .map((v) => (typeof v === "string" ? JSON.stringify(v) : String(v)));
-  if (literals.length === 0) {
-    return null;
-  }
-  return literals.join(" | ");
-}
-
-function schemaArrayToTs(record: Record<string, unknown>): string | null {
-  if (record.type !== "array") {
-    return null;
-  }
-  const items = record.items;
-  if (items === undefined || items === null) {
-    return "unknown[]";
-  }
-  if (Array.isArray(items)) {
-    if (items.length === 0) {
-      return "unknown[]";
-    }
-    const parts = items.map((it) => schemaToTs(it));
-    return `[${parts.join(", ")}]`;
-  }
-  return `${schemaToTs(items)}[]`;
-}
-
-function schemaObjectToTs(record: Record<string, unknown>): string | null {
-  if (record.type !== "object") {
-    return null;
-  }
-  const propsRaw = record.properties;
-  const requiredRaw = record.required;
-  const required = new Set<string>(
-    Array.isArray(requiredRaw) ? requiredRaw.filter((x): x is string => typeof x === "string") : [],
-  );
-
-  if (propsRaw === null || propsRaw === undefined) {
-    return "Record<string, unknown>";
-  }
-  if (typeof propsRaw !== "object" || Array.isArray(propsRaw)) {
-    return "Record<string, unknown>";
-  }
-
-  const props = propsRaw as Record<string, unknown>;
-  const entries = Object.entries(props);
-  if (entries.length === 0) {
-    return "{}";
-  }
-
-  const parts: string[] = [];
-  for (const [key, subSchema] of entries) {
-    const optional = !required.has(key);
-    const ts = schemaToTs(subSchema);
-    const safeKey = /^[a-zA-Z_$][a-zA-Z0-9_$]*$/.test(key) ? key : JSON.stringify(key);
-    const suffix = optional ? " | null" : "";
-    parts.push(`${safeKey}: ${ts}${suffix}`);
-  }
-  return `{ ${parts.join("; ")} }`;
-}
-
-function schemaToTs(schema: unknown): string {
-  if (schema === null || typeof schema !== "object" || Array.isArray(schema)) {
-    return "unknown";
-  }
-  const record = schema as Record<string, unknown>;
-
-  const fromEnum = schemaEnumToTs(record);
-  if (fromEnum !== null) {
-    return fromEnum;
-  }
-
-  const t = record.type;
-  if (t === "string") {
-    return "string";
-  }
-  if (t === "number" || t === "integer") {
-    return "number";
-  }
-  if (t === "boolean") {
-    return "boolean";
-  }
-
-  const fromArray = schemaArrayToTs(record);
-  if (fromArray !== null) {
-    return fromArray;
-  }
-
-  const fromObject = schemaObjectToTs(record);
-  if (fromObject !== null) {
-    return fromObject;
-  }
-
-  return "unknown";
-}

packages/workflow/src/types.ts

@@ -24,13 +24,13 @@ export type ThreadInput = {
   steps: RoleOutput[];
 };
 
-/** Options passed to a workflow bundle's default-export function (engine-provided). */
+/** Options passed to a workflow bundle's `run` export (engine-provided). */
 export type WorkflowFnOptions = {
   isDryRun: boolean;
   maxRounds: number;
 };
 
-/** Bundle contract — default export is a function returning an AsyncGenerator. */
+/** Bundle contract — named export `run` is a function returning an AsyncGenerator. */
 export type WorkflowFn = (
   input: ThreadInput,
   options: WorkflowFnOptions,

packages/workflow/src/worker.ts

@@ -295,16 +295,13 @@ async function main(): Promise<void> {
   // Dynamic import required: user bundle path resolved at runtime
   const modUnknown: unknown = await import(pathToFileURL(bundlePath).href);
   const modRec = modUnknown as Record<string, unknown>;
-  const defaultExport = modRec.default;
+  const runExport = modRec.run;
-  if (!isWorkflowFnLike(defaultExport)) {
+  if (!isWorkflowFnLike(runExport)) {
-    bootLog(
+    bootLog("T4BW9YJX", "workflow bundle must export run as a function (AsyncGenerator workflow)");
-      "T4BW9YJX",
-      "workflow bundle default export must be a function (AsyncGenerator workflow)",
-    );
     process.exit(2);
     return;
   }
-  const workflowFn = defaultExport;
+  const workflowFn = runExport;
 
   const threads = new Map<string, ThreadHandle>();
   let activeThreads = 0;

packages/workflow/src/workflow-descriptor.ts

@@ -8,7 +8,7 @@ export type WorkflowRoleDescriptor = {
   schema: WorkflowRoleSchema;
 };
 
-/** Workflow metadata exported as `export const descriptor` from TypeScript sources. */
+/** Workflow metadata exported as `export const descriptor` from `.esm.js` bundles. */
 export type WorkflowDescriptor = {
   description: string;
   roles: Record<string, WorkflowRoleDescriptor>;