support codex codex-web codex-cloud mcp
We tested custom MCP registration in Codex Web by appending a Datadog MCP server to /opt/codex/config.toml during setup.
What we verified:
- the MCP config is present on disk after setup;
- required environment variables are present;
- the Datadog MCP endpoint is reachable from the runtime;
- however, no Datadog MCP tools are exposed in the active Codex Web session.
This suggests that modifying /opt/codex/config.toml during setup is not sufficient to register custom MCP servers in Codex Web, and that MCP tool availability is controlled by platform/session bootstrap rather than runtime config changes.
Can you confirm:
- whether custom MCP servers are officially supported in Codex Web / Codex Cloud;
- if supported, what the correct setup path is;
- if not supported, whether this is a planned capability?