### What version of Codex is running? codex-cli 0.46.0 ### Which model were you using? qwen3-coder-plus ### What platform is your computer? Darwin 23.5.0 arm64 arm ### What steps can reproduce the bug? 1. Add a custom mcp server config（url just for example cause it’s deployed in our net) ```toml [mcp_servers.custom] url = “https://xxx.yyy.com/mcp” ``` 2 Open codex ```bash codex ``` 3. Wait CLI shows error : > MCP client for `custom` failed to start: handshaking with MCP server failed: Send message error Transport [rmcp::transport::worker::WorkerTransport>] error: Transport channel closed, when send initialized notification And no tools: ### What is the expected behavior? No errors for mcp servers, and I can see tools. Same MCP Server URL for claude code works fine
### What do you see instead? _No response_ ### Additional information _No response_