diff --git a/package.json b/package.json
index ebe622a..2628729 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,8 @@
   ],
   "scripts": {
     "build": "bun run --filter '*' build",
-    "check": "biome check .",
+    "check": "bunx tsc --build && biome check .",
+    "typecheck": "bunx tsc --build",
     "format": "biome format --write .",
     "test": "bun run --filter '*' test"
   },
diff --git a/packages/workflow-role-committer/package.json b/packages/workflow-role-committer/package.json
index ed1b50f..7ee3649 100644
--- a/packages/workflow-role-committer/package.json
+++ b/packages/workflow-role-committer/package.json
@@ -12,8 +12,5 @@
     "@uncaged/workflow": "workspace:*",
     "@uncaged/workflow-util-role": "workspace:*",
     "zod": "^4.0.0"
-  },
-  "devDependencies": {
-    "@types/node": "^25.6.0"
   }
 }
diff --git a/packages/workflow-role-llm/__tests__/create-llm-adapter.test.ts b/packages/workflow-role-llm/__tests__/create-llm-adapter.test.ts
index 73a8c98..df410a1 100644
--- a/packages/workflow-role-llm/__tests__/create-llm-adapter.test.ts
+++ b/packages/workflow-role-llm/__tests__/create-llm-adapter.test.ts
@@ -19,13 +19,13 @@ describe("createLlmAdapter", () => {
   const originalFetch = globalThis.fetch;
 
   test("posts system + user (start.content) and returns assistant text", async () => {
-    globalThis.fetch = () =>
+    globalThis.fetch = (() =>
       Promise.resolve(
         new Response(JSON.stringify({ choices: [{ message: { content: "model reply" } }] }), {
           status: 200,
           headers: { "Content-Type": "application/json" },
         }),
-      );
+      )) as unknown as typeof fetch;
 
     const provider = { baseUrl: "https://api.example/v1", apiKey: "k", model: "m" };
     const adapter = createLlmAdapter(provider);
@@ -37,13 +37,13 @@ describe("createLlmAdapter", () => {
   });
 
   test("throws on non-ok fetch response", async () => {
-    globalThis.fetch = () =>
+    globalThis.fetch = (() =>
       Promise.resolve(
         new Response("Internal Server Error", {
           status: 500,
           headers: { "Content-Type": "text/plain" },
         }),
-      );
+      )) as unknown as typeof fetch;
 
     const provider = { baseUrl: "https://api.example/v1", apiKey: "k", model: "m" };
     const adapter = createLlmAdapter(provider);
@@ -53,7 +53,7 @@ describe("createLlmAdapter", () => {
   });
 
   test("throws on fetch network failure", async () => {
-    globalThis.fetch = () => Promise.reject(new Error("ECONNREFUSED"));
+    globalThis.fetch = (() => Promise.reject(new Error("ECONNREFUSED"))) as unknown as typeof fetch;
 
     const provider = { baseUrl: "https://api.example/v1", apiKey: "k", model: "m" };
     const adapter = createLlmAdapter(provider);
diff --git a/packages/workflow-role-reviewer/__tests__/reviewer.test.ts b/packages/workflow-role-reviewer/__tests__/reviewer.test.ts
index 5db315f..8711a70 100644
--- a/packages/workflow-role-reviewer/__tests__/reviewer.test.ts
+++ b/packages/workflow-role-reviewer/__tests__/reviewer.test.ts
@@ -50,7 +50,10 @@ describe("createReviewerRole", () => {
   });
 
   test("runs reviewer extract", async () => {
-    globalThis.fetch = () => Promise.resolve(toolCallResponse(JSON.stringify({ approved: true })));
+    globalThis.fetch = (() =>
+      Promise.resolve(
+        toolCallResponse(JSON.stringify({ approved: true })),
+      )) as unknown as typeof fetch;
 
     const agent: AgentFn = async (_ctx, prompt) => {
       expect(prompt).toContain("git diff");
@@ -68,7 +71,10 @@ describe("createReviewerRole", () => {
   });
 
   test("includes uncaged-workflow thread hint when threadId set", async () => {
-    globalThis.fetch = () => Promise.resolve(toolCallResponse(JSON.stringify({ approved: false })));
+    globalThis.fetch = (() =>
+      Promise.resolve(
+        toolCallResponse(JSON.stringify({ approved: false })),
+      )) as unknown as typeof fetch;
 
     let seen = "";
     const agent: AgentFn = async (_ctx, prompt) => {
diff --git a/packages/workflow-template-solve-issue/__tests__/solve-issue-template.test.ts b/packages/workflow-template-solve-issue/__tests__/solve-issue-template.test.ts
index eec7026..981d91d 100644
--- a/packages/workflow-template-solve-issue/__tests__/solve-issue-template.test.ts
+++ b/packages/workflow-template-solve-issue/__tests__/solve-issue-template.test.ts
@@ -115,7 +115,7 @@ describe("createSolveIssueRoles", () => {
     expect(typeof roles.committer).toBe("function");
 
     const ctx = makeCtx(10, []);
-    const plannerOut = await roles.planner(ctx);
+    const plannerOut = await roles.planner(ctx as unknown as ThreadContext);
     expect(plannerOut.meta.plan).toBe("");
     expect(Array.isArray(plannerOut.meta.files)).toBe(true);
   });
diff --git a/packages/workflow-util-agent/package.json b/packages/workflow-util-agent/package.json
index eb65c00..de22ea5 100644
--- a/packages/workflow-util-agent/package.json
+++ b/packages/workflow-util-agent/package.json
@@ -4,6 +4,12 @@
   "type": "module",
   "main": "src/index.ts",
   "types": "src/index.ts",
+  "exports": {
+    ".": {
+      "types": "./src/index.ts",
+      "default": "./src/index.ts"
+    }
+  },
   "scripts": {
     "build": "echo 'TODO'",
     "test": "bun test"
diff --git a/packages/workflow-util-role/__tests__/create-role.test.ts b/packages/workflow-util-role/__tests__/create-role.test.ts
index 299059a..6501cf7 100644
--- a/packages/workflow-util-role/__tests__/create-role.test.ts
+++ b/packages/workflow-util-role/__tests__/create-role.test.ts
@@ -55,7 +55,8 @@ describe("createRole", () => {
   });
 
   test("runs AgentFn then structured extract", async () => {
-    globalThis.fetch = () => Promise.resolve(toolCallResponse(JSON.stringify({ n: 3 })));
+    globalThis.fetch = (() =>
+      Promise.resolve(toolCallResponse(JSON.stringify({ n: 3 })))) as unknown as typeof fetch;
 
     const schema = z.object({ n: z.number() });
     const agent: AgentFn = async (_ctx, prompt) => prompt;
@@ -73,7 +74,8 @@ describe("createRole", () => {
   });
 
   test("passes ThreadContext to AgentFn", async () => {
-    globalThis.fetch = () => Promise.resolve(toolCallResponse(JSON.stringify({ n: 0 })));
+    globalThis.fetch = (() =>
+      Promise.resolve(toolCallResponse(JSON.stringify({ n: 0 })))) as unknown as typeof fetch;
 
     const seen: ThreadContext[] = [];
     const agent: AgentFn = async (ctx, _prompt) => {
@@ -94,7 +96,8 @@ describe("createRole", () => {
   });
 
   test("resolves dynamic systemPrompt functions before AgentFn", async () => {
-    globalThis.fetch = () => Promise.resolve(toolCallResponse(JSON.stringify({ n: 99 })));
+    globalThis.fetch = (() =>
+      Promise.resolve(toolCallResponse(JSON.stringify({ n: 99 })))) as unknown as typeof fetch;
 
     const schema = z.object({ n: z.number() });
     const agent: AgentFn = async (_ctx, prompt) => prompt;
diff --git a/packages/workflow-util-role/__tests__/extract-meta.test.ts b/packages/workflow-util-role/__tests__/extract-meta.test.ts
index d61fe3f..6e3de1a 100644
--- a/packages/workflow-util-role/__tests__/extract-meta.test.ts
+++ b/packages/workflow-util-role/__tests__/extract-meta.test.ts
@@ -14,10 +14,10 @@ describe("extractMetaOrThrow", () => {
 
   test("dryRun returns dryRunMeta without calling fetch", async () => {
     let calls = 0;
-    globalThis.fetch = () => {
+    globalThis.fetch = (() => {
       calls += 1;
       return Promise.resolve(new Response("{}", { status: 200 }));
-    };
+    }) as unknown as typeof fetch;
 
     const schema = z.object({ n: z.number() });
     const out = await extractMetaOrThrow("r", "raw", schema, {
@@ -33,7 +33,7 @@ describe("extractMetaOrThrow", () => {
   });
 
   test("throws when extraction fails after retry", async () => {
-    globalThis.fetch = () =>
+    globalThis.fetch = (() =>
       Promise.resolve(
         new Response(
           JSON.stringify({
@@ -49,7 +49,7 @@ describe("extractMetaOrThrow", () => {
           }),
           { status: 200, headers: { "Content-Type": "application/json" } },
         ),
-      );
+      )) as unknown as typeof fetch;
 
     const schema = z.object({ n: z.number() });
 
@@ -61,7 +61,7 @@ describe("extractMetaOrThrow", () => {
   });
 
   test("returns validated meta on successful tool call", async () => {
-    globalThis.fetch = () =>
+    globalThis.fetch = (() =>
       Promise.resolve(
         new Response(
           JSON.stringify({
@@ -82,7 +82,7 @@ describe("extractMetaOrThrow", () => {
           }),
           { status: 200, headers: { "Content-Type": "application/json" } },
         ),
-      );
+      )) as unknown as typeof fetch;
 
     const schema = z.object({
       branch: z.string(),
diff --git a/packages/workflow-util-role/__tests__/llm-extract.test.ts b/packages/workflow-util-role/__tests__/llm-extract.test.ts
index 55c55de..836ebab 100644
--- a/packages/workflow-util-role/__tests__/llm-extract.test.ts
+++ b/packages/workflow-util-role/__tests__/llm-extract.test.ts
@@ -17,7 +17,7 @@ describe("llmExtract", () => {
     let capturedUrl: string | null = null;
     let capturedInit: RequestInit | null = null;
 
-    globalThis.fetch = (input: RequestInfo | URL, init?: RequestInit) => {
+    globalThis.fetch = ((input: Request | string | URL, init?: RequestInit) => {
       capturedUrl = typeof input === "string" ? input : input.toString();
       capturedInit = init ?? null;
       return Promise.resolve(
@@ -44,7 +44,7 @@ describe("llmExtract", () => {
           { status: 200, headers: { "Content-Type": "application/json" } },
         ),
       );
-    };
+    }) as unknown as typeof fetch;
 
     const result = await llmExtract({
       text: "some plan",
@@ -66,13 +66,13 @@ describe("llmExtract", () => {
     }
     expect(result.value).toEqual({ name: "cpu-usage", description: "CPU load" });
 
-    expect(capturedUrl).toBe("https://example.com/v1/chat/completions");
-    expect(capturedInit?.method).toBe("POST");
-    expect(capturedInit?.headers).toMatchObject({
+    expect(capturedUrl!).toBe("https://example.com/v1/chat/completions");
+    expect(capturedInit!.method).toBe("POST");
+    expect(capturedInit!.headers).toMatchObject({
       Authorization: "Bearer k",
       "Content-Type": "application/json",
     });
-    const body = JSON.parse(capturedInit?.body as string) as {
+    const body = JSON.parse(capturedInit!.body as string) as {
       model: string;
       tool_choice: { function: { name: string } };
     };
@@ -83,7 +83,7 @@ describe("llmExtract", () => {
   test("returns schema_validation_failed when arguments do not match the schema", async () => {
     const schema = z.object({ n: z.number() });
 
-    globalThis.fetch = () =>
+    globalThis.fetch = (() =>
       Promise.resolve(
         new Response(
           JSON.stringify({
@@ -99,7 +99,7 @@ describe("llmExtract", () => {
           }),
           { status: 200, headers: { "Content-Type": "application/json" } },
         ),
-      );
+      )) as unknown as typeof fetch;
 
     const result = await llmExtract({
       text: "x",
@@ -120,10 +120,10 @@ describe("llmExtract", () => {
 
   test("dryRun skips fetch and returns dryRunMeta", async () => {
     let calls = 0;
-    globalThis.fetch = () => {
+    globalThis.fetch = (() => {
       calls += 1;
       return Promise.resolve(new Response("{}", { status: 200 }));
-    };
+    }) as unknown as typeof fetch;
 
     const schema = z.object({ n: z.number() });
     const result = await llmExtract({