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codex - 💡(How to fix) Fix MCP client for `computer-use` failed to start

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Error Message

error message: I only see the error message when I open a new Codex session. I should not be able to see the error since I have computer-use enabled. I can also use the computer-use plugin and skill even though I have that visual error on the CLI. I think this might just be a visual bug on the terminal. I don't think this is because I am using Warp. I also tried macOS terminal and I see the same visual error.

Root Cause

I think this might just be a visual bug on the terminal. I don't think this is because I am using Warp. I also tried macOS terminal and I see the same visual error.

RAW_BUFFERClick to expand / collapse

What version of Codex CLI is running?

0.130.0

What subscription do you have?

Pro

Which model were you using?

gpt-5.5 xhigh fast

What platform is your computer?

Darwin 24.6.0 arm64 arm

What terminal emulator and version are you using (if applicable)?

Warp 0.2026.05.13.09.15.01

What issue are you seeing?

error message: ⚠ MCP client for computer-use failed to start: MCP startup failed: handshaking with MCP server failed: connection closed: initialize response

⚠ MCP startup incomplete (failed: computer-use)

I only see the error message when I open a new Codex session.

What steps can reproduce the bug?

Uploaded thread: 019e2c3a-4797-7ff2-9e4c-bb78c1d13919

What is the expected behavior?

I should not be able to see the error since I have computer-use enabled. I can also use the computer-use plugin and skill even though I have that visual error on the CLI.

Additional information

I think this might just be a visual bug on the terminal. I don't think this is because I am using Warp. I also tried macOS terminal and I see the same visual error.

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#training loop#device allocation#model download#tokenizer error#prompt formatting

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codex - 💡(How to fix) Fix MCP client for `computer-use` failed to start