Add configurable initialize timeout to MCP server config

[Mansehej]

Introduces a seconds-based initialization timeout for MCP. Supports both per‑server and global configuration with clear precedence.

Behavior

• Precedence:
  • Per‑server: mcp_servers..initialize_timeout_s
  • Global: mcp_initialize_timeout_s
  • Default: 10 seconds

Changes

• core
  • config_types: add initialize_timeout_s to McpServerConfig
  • config: add mcp_initialize_timeout_s to Config/ConfigToml and wire through
  • mcp_connection_manager: accept global timeout and apply precedence
  • codex: pass global timeout into connection manager
• docs
  • config.md and advanced.md updated with new keys and examples

Testing

• cargo fmt
• cargo clippy --tests -p codex-core
• cargo test --all-features

Related issues

• MCP server works well with Claude Code CLI but fails with Codex when using the same configuration #3324
• [Windows] MCP child exits with WinError 10106 when SystemRoot/windir are missing; Codex reports timeout — observed with Python MCP (serena) #3311
• Codex extension in vscode: MCP server (Context7) fails with “request timed out” #3289
• Windows can not launch MCP servers using PNPM #3245
• Laravel Boost MCP fail to start in IDE #3144
• Make MCP Request timeout configurable #2346
• MCP HTTP/SSE (Rube/Composio) fails to start with 'request timed out' on macOS (Codex 0.29.0) #3196
• Optional / Lazy Loading of MCP Servers #2335
• MCP needs a greater timeout for startup (Windows) #2905

and potentially more.

[github-actions]

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[Mansehej]

I have read the CLA Document and I hereby sign the CLA

[Mansehej]

recheck

[Mansehej]

Closing because another implementation solving the same problem is now merged.