{
  "$type": "site.standard.document",
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  "path": "/t/custom-mcp-server-in-codex-web/1378356#post_1",
  "publishedAt": "2026-04-02T07:44:29.000Z",
  "site": "https://community.openai.com",
  "tags": [
    "support",
    "codex",
    "codex-web",
    "codex-cloud",
    "mcp"
  ],
  "textContent": "support codex codex-web codex-cloud mcp\n\nWe tested custom MCP registration in Codex Web by appending a Datadog MCP server to `/opt/codex/config.toml` during setup.\n\nWhat we verified:\n\n  * the MCP config is present on disk after setup;\n  * required environment variables are present;\n  * the Datadog MCP endpoint is reachable from the runtime;\n  * however, no Datadog MCP tools are exposed in the active Codex Web session.\n\n\n\nThis 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.\n\nCan you confirm:\n\n  * whether custom MCP servers are officially supported in Codex Web / Codex Cloud;\n  * if supported, what the correct setup path is;\n  * if not supported, whether this is a planned capability?\n\n",
  "title": "Custom MCP server in Codex Web"
}