Codex ACP fails with `pnpm` in `packageManager` field inside `package.json`

[aantusahaa]

Reproduction steps

1. Open a javascript project with packageManager field set to use pnpm. e.g.,

{
"packageManager": "pnpm@11.5.0+sha512.dbfcc4f81cf48597afd4bc391ffdf12c11f1a9fb83a395bfa6b0a2d9cc2fd8ffebafdb1ccbd529632153f793904c2615b7f09fe1a345473fd1c35845172a8eb1"
}

2. Enable pnpm with corepack
3. Install codex from acp registry (complete the authentication)
4. Try to open a codex thread from agent panel
5. You will be greeted with the following error,

Current vs. Expected behavior

Current behavior: Fails to open codex thread in a javascript project that has pnpm in the packageManager field inside package.json.
Expected behavior: Any agent should work regardless of what packageManager is set to in package.json.

Issue seems very similar to #54323

Zed version and system specs

Zed: v1.11.3+stable.326.952d712dac48a4af2c54fb22c82d82a9d69b72d4 (Zed)
OS: Linux Wayland manjaro
Memory: 15 GiB
Architecture: x86_64
GPU: AMD Radeon Graphics (RADV RENOIR) || radv || Mesa 26.1.2-arch1.2

Attach Zed log file

Zed.log

2026-07-18T13:53:27+06:00 INFO  [agent_client_protocol::util] connection; name="zed"
2026-07-18T13:53:27+06:00 WARN  [agent_servers::acp] agent stderr: This project is configured to use pnpm because /home/antu/Codes/oits/mmis-be/package.json has a "packageManager" field
2026-07-18T13:53:27+06:00 INFO  [agent_client_protocol::util] connection; name="zed"
2026-07-18T13:53:27+06:00 ERROR [agent_servers::acp] ACP connection error: Internal error: {
  "spawned_at": "/home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/agent-client-protocol-1.1.0/src/jsonrpc.rs:1428:39",
  "data": "Broken pipe (os error 32)"
}

Relevant Zed settings

settings.json

{
  "agent_servers": {
    "codex-acp": {
      "type": "registry"
    }
  }
}

Relevant Keymap

keymap.json

(for AI issues) Model provider details

Codex (via acp registry) v1.1.4

If you are using WSL on Windows, what flavor of Linux are you using?

No response