fix(moderator): detect empty edge prompt after template rendering (#553)

When mustache variables in edge prompts resolve to empty strings (because
upstream output lacks the fields), the engine now returns a Result.error
instead of passing an empty --prompt to the agent.

- evaluate.ts: check rendered prompt is non-empty after mustache.render()
- run.ts: improve parseArgv error message for empty --prompt
- Export parseArgv for testability
- Add 7 tests covering all cases from the spec

packages/workflow-util-agent/src/__tests__/parseArgv.test.ts

@@ -0,0 +1,45 @@
+import { afterEach, beforeEach, describe, expect, test } from "bun:test";
+
+describe("parseArgv empty prompt error message", () => {
+  let stderrOutput: string;
+  let _exitCode: number | null;
+  const originalExit = process.exit;
+  const originalStderrWrite = process.stderr.write;
+
+  beforeEach(() => {
+    stderrOutput = "";
+    _exitCode = null;
+    process.exit = ((code?: number) => {
+      _exitCode = code ?? 1;
+      throw new Error("process.exit called");
+    }) as any;
+    process.stderr.write = ((chunk: string) => {
+      stderrOutput += chunk;
+      return true;
+    }) as any;
+  });
+
+  afterEach(() => {
+    process.exit = originalExit;
+    process.stderr.write = originalStderrWrite;
+  });
+
+  test("empty prompt produces error message mentioning template variables", async () => {
+    const { parseArgv } = await import("../run.js");
+    const argv = [
+      "node",
+      "uwf-hermes",
+      "--thread",
+      "01ABCDEFGHIJKLMNOPQRSTUVWX",
+      "--role",
+      "classifier",
+      "--prompt",
+      "",
+    ];
+
+    expect(() => parseArgv(argv)).toThrow("process.exit called");
+    expect(stderrOutput).toContain("prompt");
+    expect(stderrOutput).toContain("empty");
+    expect(stderrOutput).toContain("template");
+  });
+});

packages/workflow-util-agent/src/index.ts

@@ -11,7 +11,7 @@ export {
 } from "./extract.js";
 export type { FrontmatterFastPathResult } from "./frontmatter.js";
 export { tryFrontmatterFastPath } from "./frontmatter.js";
-export { createAgent } from "./run.js";
+export { createAgent, parseArgv } from "./run.js";
 export { getCachedSessionId, getCachePath, setCachedSessionId } from "./session-cache.js";
 export { getConfigPath, getEnvPath, loadWorkflowConfig, resolveStorageRoot } from "./storage.js";
 export type {

packages/workflow-util-agent/src/run.ts

@@ -32,13 +32,16 @@ function getNamedArg(argv: string[], name: string): string {
   return argv[idx + 1];
 }
 
-function parseArgv(argv: string[]): { threadId: ThreadId; role: string; prompt: string } {
+export function parseArgv(argv: string[]): { threadId: ThreadId; role: string; prompt: string } {
   const threadId = getNamedArg(argv, "--thread");
   const role = getNamedArg(argv, "--role");
   const prompt = getNamedArg(argv, "--prompt");
   if (threadId === "") fail(USAGE);
   if (role === "") fail(USAGE);
-  if (prompt === "") fail(USAGE);
+  if (prompt === "")
+    fail(
+      `--prompt is empty. If this agent was spawned by uwf, the edge prompt template may have unresolved variables. ${USAGE}`,
+    );
   return { threadId: threadId as ThreadId, role, prompt };
 }