diff --git a/packages/workflow-agent-cursor/tsconfig.json b/packages/workflow-agent-cursor/tsconfig.json
index d9141ff..c9b8393 100644
--- a/packages/workflow-agent-cursor/tsconfig.json
+++ b/packages/workflow-agent-cursor/tsconfig.json
@@ -6,5 +6,9 @@
     "composite": true
   },
   "include": ["src/**/*.ts"],
-  "references": [{ "path": "../workflow-runtime" }, { "path": "../workflow-util-agent" }]
+  "references": [
+    { "path": "../workflow-cas" },
+    { "path": "../workflow-runtime" },
+    { "path": "../workflow-util-agent" }
+  ]
 }
diff --git a/packages/workflow-cas/tsconfig.json b/packages/workflow-cas/tsconfig.json
index 27c4bed..b852fc3 100644
--- a/packages/workflow-cas/tsconfig.json
+++ b/packages/workflow-cas/tsconfig.json
@@ -2,7 +2,8 @@
   "extends": "../../tsconfig.json",
   "compilerOptions": {
     "rootDir": "src",
-    "outDir": "dist"
+    "outDir": "dist",
+    "composite": true
   },
   "include": ["src"],
   "references": [{ "path": "../workflow-protocol" }, { "path": "../workflow-util" }]
diff --git a/packages/workflow-protocol/src/index.ts b/packages/workflow-protocol/src/index.ts
index 1276383..9e30a79 100644
--- a/packages/workflow-protocol/src/index.ts
+++ b/packages/workflow-protocol/src/index.ts
@@ -13,6 +13,7 @@ export type {
   AdapterFn,
   AdvanceOutcome,
   AgentContext,
+  AgentFn,
   CasStore,
   ExtractFn,
   ExtractResult,
diff --git a/packages/workflow-protocol/src/types.ts b/packages/workflow-protocol/src/types.ts
index 72b2a0f..3f3a7ad 100644
--- a/packages/workflow-protocol/src/types.ts
+++ b/packages/workflow-protocol/src/types.ts
@@ -151,6 +151,15 @@ export type RoleFn<T> = (ctx: ThreadContext, runtime: WorkflowRuntime) => Promis
 
 export type AdapterFn = <T>(prompt: string, schema: z.ZodType<T>) => RoleFn<T>;
 
+/**
+ * Core agent function. Input is always {@link ThreadContext}, output is always string.
+ * `Opt` captures agent-specific structured options.
+ * Agents with no extra options use `AgentFn` (Opt defaults to void).
+ */
+export type AgentFn<Opt = void> = Opt extends void
+  ? (ctx: ThreadContext) => Promise<string>
+  : (ctx: ThreadContext, options: Opt) => Promise<string>;
+
 export type AdapterBinding = {
   adapter: AdapterFn;
   overrides: Partial<Record<string, AdapterFn>> | null;
diff --git a/packages/workflow-runtime/src/index.ts b/packages/workflow-runtime/src/index.ts
index bdaef83..3a751f1 100644
--- a/packages/workflow-runtime/src/index.ts
+++ b/packages/workflow-runtime/src/index.ts
@@ -5,6 +5,7 @@ export type {
   AdapterBinding,
   AdapterFn,
   AgentContext,
+  AgentFn,
   CasStore,
   ExtractFn,
   ExtractResult,
diff --git a/packages/workflow-runtime/src/types.ts b/packages/workflow-runtime/src/types.ts
index d78a9d2..bf73d7d 100644
--- a/packages/workflow-runtime/src/types.ts
+++ b/packages/workflow-runtime/src/types.ts
@@ -7,6 +7,7 @@ export type {
   AdapterFn,
   AdvanceOutcome,
   AgentContext,
+  AgentFn,
   CasStore,
   ExtractFn,
   ExtractResult,
diff --git a/packages/workflow-util-agent/src/create-agent-adapter.ts b/packages/workflow-util-agent/src/create-agent-adapter.ts
new file mode 100644
index 0000000..a7e1fe3
--- /dev/null
+++ b/packages/workflow-util-agent/src/create-agent-adapter.ts
@@ -0,0 +1,48 @@
+import { putContentNodeWithRefs } from "@uncaged/workflow-cas";
+import type {
+  AdapterFn,
+  AgentFn,
+  RoleResult,
+  ThreadContext,
+  WorkflowRuntime,
+} from "@uncaged/workflow-runtime";
+import type * as z from "zod/v4";
+
+export type ExtractOptionsFn<Opt> = (
+  ctx: ThreadContext,
+  prompt: string,
+  runtime: WorkflowRuntime,
+) => Promise<Opt>;
+
+/**
+ * Bridges {@link AgentFn} to {@link AdapterFn}.
+ *
+ * 1. extract(ctx, prompt, runtime) → Opt
+ * 2. agent(ctx, options) → raw string
+ * 3. Store raw string in CAS
+ * 4. runtime.extract(schema, contentHash) → typed meta T
+ */
+export function createAgentAdapter<Opt>(
+  agent: AgentFn<Opt>,
+  extract: ExtractOptionsFn<Opt>,
+): AdapterFn {
+  return <T>(prompt: string, schema: z.ZodType<T>) => {
+    return async (ctx: ThreadContext, runtime: WorkflowRuntime): Promise<RoleResult<T>> => {
+      const options = await extract(ctx, prompt, runtime);
+      const raw = await (agent as (ctx: ThreadContext, optionsParam: Opt) => Promise<string>)(
+        ctx,
+        options,
+      );
+      const contentHash = await putContentNodeWithRefs(runtime.cas, raw, []);
+      const extracted = await runtime.extract(
+        schema as z.ZodType<Record<string, unknown>>,
+        contentHash,
+      );
+      return { meta: extracted.meta as T, childThread: null };
+    };
+  };
+}
+
+export function createSimpleAgentAdapter(agent: AgentFn<void>): AdapterFn {
+  return createAgentAdapter(agent, async () => undefined as unknown as undefined);
+}
diff --git a/packages/workflow-util-agent/src/index.ts b/packages/workflow-util-agent/src/index.ts
index a0b04f5..f65afd2 100644
--- a/packages/workflow-util-agent/src/index.ts
+++ b/packages/workflow-util-agent/src/index.ts
@@ -1,4 +1,6 @@
 export { buildAgentPrompt, buildThreadInput } from "./build-agent-prompt.js";
+export type { ExtractOptionsFn } from "./create-agent-adapter.js";
+export { createAgentAdapter, createSimpleAgentAdapter } from "./create-agent-adapter.js";
 export type { TextAdapterResult, TextProducerFn } from "./create-text-adapter.js";
 export { createTextAdapter } from "./create-text-adapter.js";
 export type { SpawnCliConfig, SpawnCliError, SpawnCliResult } from "./spawn-cli.js";