From 017eb1b4101baecfd25258c072670cf5a6405fc2 Mon Sep 17 00:00:00 2001
From: Stefano Fiorini <stefano@fiorinis.com>
Date: Wed, 20 May 2026 13:47:32 -0500
Subject: [PATCH] fix: pipe and close stdin for codex to prevent hang on stdin
 read

When codex exec receives a prompt as a positional argument, it still
tries to read additional input from stdin (prints 'Reading additional
input from stdin...'). With stdio stdin set to 'ignore' or default,
codex blocks indefinitely waiting for stdin that never comes.

Fix: use stdio ['pipe', 'pipe', 'pipe'] and immediately close stdin
via child.stdin.end() in both execute.ts (sync) and jobs.ts (async).
This signals EOF to codex so it proceeds with the positional prompt.
---
 tools/ai-cli-dispatch/src/execute.ts | 4 ++++
 tools/ai-cli-dispatch/src/jobs.ts    | 5 ++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/tools/ai-cli-dispatch/src/execute.ts b/tools/ai-cli-dispatch/src/execute.ts
index 626acf4..56d10e3 100644
--- a/tools/ai-cli-dispatch/src/execute.ts
+++ b/tools/ai-cli-dispatch/src/execute.ts
@@ -77,8 +77,12 @@ export async function executePrompt(
 
     const child = spawnImpl(command, args, {
       shell: false,
+      stdio: ["pipe", "pipe", "pipe"],
     });
 
+    // Close stdin immediately so clients like codex don't hang waiting for input
+    child.stdin?.end();
+
     child.stdout?.on("data", (chunk: Buffer | string) => {
       stdout += chunk.toString();
     });
diff --git a/tools/ai-cli-dispatch/src/jobs.ts b/tools/ai-cli-dispatch/src/jobs.ts
index a027cff..c5bfc36 100644
--- a/tools/ai-cli-dispatch/src/jobs.ts
+++ b/tools/ai-cli-dispatch/src/jobs.ts
@@ -118,9 +118,12 @@ export async function startJob(
     const child = spawnImpl(command, args, {
       detached: true,
       shell: false,
-      stdio: ["ignore", "pipe", "pipe"],
+      stdio: ["pipe", "pipe", "pipe"],
     });
 
+    // Close stdin immediately so clients like codex don't hang waiting for input
+    child.stdin?.end();
+
     record.pid = child.pid ?? undefined;
     writeJobFile(jobDir, record, fs);