Codex desktop exits the tool call immediately when any MCP tool is invoked
Open 💬 2 comments Opened Apr 28, 2026 by nxl2692
💡 Likely answer: A maintainer (github-actions[bot], contributor)
responded on this thread — see the highlighted reply below.
What version of the Codex App are you using (From “About Codex” dialog)?
26.426.12240
What subscription do you have?
Third-party provider (aihubmix)
What platform is your computer?
Darwin 25.0.0 arm64 arm
What issue are you seeing?
In Codex desktop, MCP tools are unusable. As soon as an MCP tool is invoked, the tool call ends immediately instead of running normally. This makes MCP-based workflows impossible to use. Non-MCP behavior appears normal, but every MCP invocation fails in the same way.
What steps can reproduce the bug?
Open Codex desktop.
Start a normal conversation in a workspace.
Ask the agent to use any MCP tool.
The moment the MCP tool is invoked, the tool call ends immediately.
This happens consistently across repeated attempts.
<img width="850" height="201" alt="Image" src="https://github.com/user-attachments/assets/5f4b1fbf-fc1a-4b73-aea2-5ec33226a060" />
What is the expected behavior?
_No response_
Additional information
_No response_
2 Comments
Potential duplicates detected. Please review them and close your issue if it is a duplicate.
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This seems similar to the Codex exec issue I encountered before—see #19309