iMCP silently quits when used from Codex desktop

[niederme]

Apologies if there is no intention of supporting Codex, but I don’t see why not?

Summary

iMCP crashes / silently quits when I use it from Codex desktop as an MCP client.

This seems specific to Codex in my setup. The same iMCP install works for me in Claude Code.

Environment

• iMCP 1.4.0 (build 10)
• macOS 26.3.1
• Apple Silicon
• Fails with: Codex desktop
• Works with: Claude Code

Steps to reproduce

1. Launch iMCP
2. Use Codex desktop with iMCP as an MCP tool provider
3. Invoke an iMCP tool such as calendar listing

Expected

The tool call succeeds, or returns a normal MCP/tool error.

Actual

The connection drops and iMCP quits.

Crash signature

The crash reports consistently show Swift assertion failures.

From the main app crash report:

exception" : {"type":"EXC_BREAKPOINT","signal":"SIGTRAP"}
_assertionFailure(_:_:file:line:flags:)
CheckedContinuation.resume(throwing:)

From the bundled helper crash report:

exception" : {"type":"EXC_BREAKPOINT","signal":"SIGTRAP"}
_assertionFailure(_:_:file:line:flags:)
swift_errorInMain

I can provide the full .ips reports if helpful.