Codex crashes on startup due to MCP "Method not found" errors (Windows)

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

Latest version

What subscription do you have?

ChatGPT Pro

What platform is your computer?

Microsoft Windows NT 10.0.26200.0 x64

What issue are you seeing?

Issue

Codex crashes or becomes unusable during startup due to MCP server errors.

Error logs

Mcp error: -32601: Method not found

Failed to list resource templates/resources for MCP servers:

• Vibma
• openaiDeveloperDocs
• playwright

Steps to reproduce

1. Launch Codex
2. MCP servers initialize automatically
3. Errors appear and Codex fails / crashes

Expected behavior

Codex should either:

• Skip incompatible MCP servers gracefully, or
• Show a clear warning without crashing

Actual behavior

Codex fails during startup due to MCP connection errors.

Workaround

Disabling MCP servers in config.toml resolves the issue.

Notes

This appears to be caused by MCP server incompatibility or missing method support (-32601 Method not found).
Codex currently does not handle this failure gracefully.

What steps can reproduce the bug?

1. Launch Codex on Windows
2. Codex automatically initializes configured MCP servers
3. MCP servers (Vibma, openaiDeveloperDocs, playwright) attempt to connect
4. Errors appear: "Mcp error: -32601: Method not found"
5. Codex crashes or becomes unusable

What is the expected behavior?

Codex should handle MCP server incompatibility gracefully.

If an MCP server does not support a method, Codex should:

• Skip the server, or
• Show a clear warning

It should not crash or block the entire application.

Additional information

Environment:

• OS: Microsoft Windows NT 10.0.26200.0 x64 (Windows 11)
• Codex running via desktop UI