Improve delegate (#377)

* Improve delegate

* fix stale log regexes in delegate tests and add test-coupling comments

Co-authored-by: Cursor <cursoragent@cursor.com>

---------

Co-authored-by: Cursor <cursoragent@cursor.com>

agents/codex.ts

@@ -120,21 +120,13 @@ ${mcpServerSections.join("\n\n")}
   return codexDir;
 }
 
-// cache the installed CLI path so subagents don't re-download
-let cachedCliPath: string | null = null;
-
 async function installCodex(): Promise<string> {
-  if (cachedCliPath) return cachedCliPath;
-
-  const cliPath = await installFromNpmTarball({
+  return await installFromNpmTarball({
     packageName: "@openai/codex",
     version: CODEX_CLI_VERSION,
     executablePath: "bin/codex.js",
     installDependencies: true,
   });
-
-  cachedCliPath = cliPath;
-  return cliPath;
 }
 
 export const codex = agent({

agents/shared.ts

@@ -42,6 +42,7 @@ export const agent = <const input extends AgentInput>(input: input): defineAgent
     ...input,
     run: async (ctx: AgentRunContext): Promise<AgentResult> => {
       log.info(`» agent:   ${input.name}`);
+      // matched by delegateEffort test validator — update tests if changed
       log.info(`» effort:  ${ctx.payload.effort}`);
       if (ctx.payload.timeout) log.info(`» timeout: ${ctx.payload.timeout}`);
       log.info(`» web:     ${ctx.payload.web}`);