refactor: simplify reviewer — discriminated union meta, minimal prompt

- ReviewerMeta → discriminated union: approved | rejected (with issues)
- Remove method-heavy prompt — agent has built-in code review capability
- Prompt now just says: project path, threadId for context, approve or reject
- No non-blocking suggestions (they get ignored anyway)
- ReviewerConfig simplified to just { cwd }

packages/workflow-role-reviewer/__tests__/reviewer.test.ts

@@ -29,6 +29,7 @@ function toolCallResponse(argsJson: string): Response {
 
 function makeCtx(): ThreadContext {
   return {
+    threadId: "01TEST00000000000000000000",
     start: {
       role: START,
       content: "task",
@@ -49,14 +50,14 @@ describe("createReviewerRole", () => {
     mock.restore();
   });
 
-  test("runs reviewer extract", async () => {
+  test("approved verdict", async () => {
     globalThis.fetch = (() =>
       Promise.resolve(
-        toolCallResponse(JSON.stringify({ approved: true })),
+        toolCallResponse(JSON.stringify({ status: "approved" })),
       )) as unknown as typeof fetch;
 
     const agent: AgentFn = async (_ctx, prompt) => {
-      expect(prompt).toContain("git diff");
+      expect(prompt).toContain("code reviewer");
       expect(prompt).toContain(DEFAULT_REVIEWER_CONFIG.cwd);
       return "review done";
     };
@@ -64,16 +65,33 @@ describe("createReviewerRole", () => {
     const role = createReviewerRole(agent, {
       provider,
       dryRun: null,
-      dryRunMeta: { approved: true },
+      dryRunMeta: { status: "approved" },
     });
     const out = await role(makeCtx());
-    expect(out.meta).toEqual({ approved: true });
+    expect(out.meta).toEqual({ status: "approved" });
   });
 
-  test("includes uncaged-workflow thread hint when threadId set", async () => {
+  test("rejected verdict with issues", async () => {
     globalThis.fetch = (() =>
       Promise.resolve(
-        toolCallResponse(JSON.stringify({ approved: false })),
+        toolCallResponse(JSON.stringify({ status: "rejected", issues: ["secrets in code"] })),
+      )) as unknown as typeof fetch;
+
+    const agent: AgentFn = async () => "found problems";
+
+    const role = createReviewerRole(agent, {
+      provider,
+      dryRun: null,
+      dryRunMeta: { status: "approved" },
+    });
+    const out = await role(makeCtx());
+    expect(out.meta).toEqual({ status: "rejected", issues: ["secrets in code"] });
+  });
+
+  test("prompt includes threadId from context", async () => {
+    globalThis.fetch = (() =>
+      Promise.resolve(
+        toolCallResponse(JSON.stringify({ status: "approved" })),
       )) as unknown as typeof fetch;
 
     let seen = "";
@@ -84,15 +102,10 @@ describe("createReviewerRole", () => {
 
     const role = createReviewerRole(
       agent,
-      { provider, dryRun: null, dryRunMeta: { approved: false } },
-      {
-        cwd: "/proj",
-        conventionsPath: null,
-        extraChecks: [],
-        threadId: "01ABCDEF234567890ABCDEFGH",
-      },
+      { provider, dryRun: null, dryRunMeta: { status: "approved" } },
+      { cwd: "/proj" },
     );
     await role(makeCtx());
-    expect(seen).toContain("uncaged-workflow thread 01ABCDEF234567890ABCDEFGH");
+    expect(seen).toContain("uncaged-workflow thread 01TEST00000000000000000000");
   });
 });

packages/workflow-role-reviewer/src/reviewer.ts

@@ -3,91 +3,52 @@ import { createRole } from "@uncaged/workflow-agent-llm";
 import type { LlmProvider } from "@uncaged/workflow-util-role";
 import * as z from "zod/v4";
 
-export const reviewerMetaSchema = z.object({
-  approved: z.boolean().describe("true if the diff is clean and ready to merge"),
-});
+export const reviewerMetaSchema = z.discriminatedUnion("status", [
+  z.object({
+    status: z.literal("approved"),
+  }),
+  z.object({
+    status: z.literal("rejected"),
+    issues: z.array(z.string()).describe("blocking issues that must be fixed"),
+  }),
+]);
 export type ReviewerMeta = z.infer<typeof reviewerMetaSchema>;
 
 export type ReviewerConfig = {
   cwd: string;
-  conventionsPath: string | null;
-  extraChecks: ReadonlyArray<string>;
-  /** When non-null, prompts reference `uncaged-workflow thread <id>`. */
-  threadId: string | null;
 };
 
 export const DEFAULT_REVIEWER_CONFIG: ReviewerConfig = {
   cwd: ".",
-  conventionsPath: "CONVENTIONS.md",
-  extraChecks: [],
-  threadId: null,
 };
 
-function summarizeThreadContext(ctx: ThreadContext): string {
-  const lines: string[] = [`Initial prompt:\n${ctx.start.content}`];
-  for (const step of ctx.steps) {
-    const snippet = step.content.length > 600 ? `${step.content.slice(0, 600)}…` : step.content;
-    lines.push(`\n### ${step.role}\n${snippet}`);
-  }
-  return lines.join("\n");
-}
-
 function reviewerPrompt(config: ReviewerConfig, ctx: ThreadContext): string {
-  const { cwd, conventionsPath, extraChecks, threadId } = config;
+  const { cwd } = config;
 
-  const conventionsBlock =
-    conventionsPath !== null ? `Read project conventions: \`cat ${cwd}/${conventionsPath}\`\n` : "";
+  return `You are a code reviewer. The project is at \`${cwd}\`.
 
-  const threadBlock =
-    threadId !== null
-      ? `Read the workflow thread for context: \`uncaged-workflow thread ${threadId}\`\n`
-      : `## Thread context (no thread id)\n\n${summarizeThreadContext(ctx)}\n`;
+## Context
 
-  const extraBlock =
-    extraChecks.length > 0
-      ? `\n### Project-specific checks\n${extraChecks.map((c) => `- ${c}`).join("\n")}\n`
-      : "";
+Use \`uncaged-workflow thread ${ctx.threadId}\` to read the full workflow thread for context on what was done and why.
 
-  return `You are a **code reviewer**. You run after the coder and before the tester.
+## Task
 
-**IMPORTANT: The project is at \`${cwd}\`. Always \`cd ${cwd}\` first.**
+Review the current git diff in \`${cwd}\`. Give a clear **approve** or **reject** verdict.
 
-${threadBlock}
-${conventionsBlock}
-## Your job — static analysis of the git diff
+Only reject for **blocking issues** — things that must be fixed before merge. Do not mention minor style preferences or non-blocking suggestions; they will be ignored.
 
-Run these commands and analyze the output:
-
-1. **\`cd ${cwd} && git diff --stat\`** — see what files changed
-2. **\`cd ${cwd} && git diff\`** — read the actual diff
-3. **\`cd ${cwd} && git status --short\`** — check for untracked files
-
-## Checklist
-
-### Reject (approved: false) — tell coder exactly what to fix
-- **Garbage files**: build artifacts, lockfiles, IDE config that should not be committed
-- **Secrets/credentials**: API keys, tokens, passwords hardcoded in the diff
-- **Unrelated changes**: files modified outside the scope of the task
-${
-  conventionsPath !== null
-    ? `- **Convention violations**: patterns that contradict ${conventionsPath}\n`
-    : ""
-}${extraBlock}
-### Approve (approved: true) — no comment needed
-- Diff is clean, focused, follows project standards
-
-End with:
+End with your verdict:
 \`\`\`json
-{ "approved": true }
+{ "status": "approved" }
 \`\`\`
 or
 \`\`\`json
-{ "approved": false }
+{ "status": "rejected", "issues": ["issue 1", "issue 2"] }
 \`\`\``;
 }
 
 /**
- * Code review role: agent inspects git diffs; structured extract yields `approved`.
+ * Code review role: agent inspects git diffs; structured extract yields approve/reject verdict.
  */
 export function createReviewerRole(
   adapter: AgentFn,

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

@@ -25,6 +25,7 @@ function makeCtx(
   steps: ThreadContext<SolveIssueMeta>["steps"],
 ): ThreadContext<SolveIssueMeta> {
   return {
+    threadId: "01TEST00000000000000000000",
     start: makeStart(maxRounds),
     steps,
   };
@@ -52,7 +53,9 @@ function reviewerStep(approved: boolean): RoleStep<SolveIssueMeta> {
   return {
     role: "reviewer",
     content: "rev",
-    meta: { approved },
+    meta: approved
+      ? { status: "approved" as const }
+      : { status: "rejected" as const, issues: ["needs fix"] },
     timestamp: 3,
   };
 }

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

@@ -21,7 +21,7 @@ export const solveIssueModerator: Moderator<SolveIssueMeta> = (ctx) => {
   }
 
   if (last.role === "reviewer") {
-    if (last.meta.approved === true) {
+    if (last.meta.status === "approved") {
       return "committer";
     }
     if (ctx.steps.length < maxRounds - 1) {

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

@@ -46,7 +46,7 @@ const CODER_DRY_RUN_META: CoderMeta = {
 };
 
 const REVIEWER_DRY_RUN_META: ReviewerMeta = {
-  approved: true,
+  status: "approved",
 };
 
 const COMMITTER_DRY_RUN_META: CommitterMeta = {
@@ -88,11 +88,8 @@ export type SolveIssueRoles = {
 
 export function createSolveIssueRoles(config: SolveIssueRolesConfig): SolveIssueRoles {
   const extract = resolveExtract(config);
-  const reviewerGit = {
+  const reviewerConfig = {
     cwd: config.workdir,
-    conventionsPath: null,
-    extraChecks: [],
-    threadId: null,
   };
   const committerGit = {
     cwd: config.workdir,
@@ -131,7 +128,7 @@ export function createSolveIssueRoles(config: SolveIssueRolesConfig): SolveIssue
       dryRun: extract.dryRun,
       dryRunMeta: REVIEWER_DRY_RUN_META,
     },
-    reviewerGit,
+    reviewerConfig,
   );
 
   const committer: Role<CommitterMeta> = createCommitterRole(