Codex app cross-thread messaging still uses removed dynamic tools

What version of the Codex App are you using (From “About Codex” dialog)?

Version 26.903.71938

What subscription do you have?

pro

What platform is your computer?

No response

What issue are you seeing?

Feedback ID: 019fc9d5-bdc0-7480-97d5-8ba648e5071f

Environment:

• Codex desktop app on Windows
• Remote Ubuntu project connected through SSH
• Codex CLI: 0.154.0
• App server: 0.154.0

list_threads and read_thread now work, and previously missing task histories display correctly.

However, send_message_to_thread still fails for every task with:

“This app tool is no longer available through dynamic tools. Use the codex_app MCP server. If that server is unavailable on this host, task delegation is unavailable.”

Expected:
A Coordinator task can send prompts to other existing Codex tasks in the same remote project.

Actual:
The tool appears to route through the removed dynamic-tools implementation instead of the codex_app MCP server.

The issue persists after upgrading the remote CLI/app-server to 0.154.0 and restarting/reconnecting the desktop app. It affects multiple tasks and is not specific to one conversation.

What steps can reproduce the bug?

Feedback ID: 019fc9d5-bdc0-7480-97d5-8ba648e5071f

What is the expected behavior?

No response

Additional information

No response

Start by tracing how send_message_to_thread is routed for a Coordinator task in the codex_app MCP server versus the removed dynamic-tools path. Reproduce with the listed Windows desktop and remote Ubuntu setup using existing tasks; done means prompts are delivered across threads without the dynamic-tools error.