MCP servers configuration not available in Settings UI #32220

Activity

1. AnetteLarios

   added

   appIssues related to the Codex desktop appIssues related to the Codex desktop app

   on Jul 10, 2026
2. github-actions

   added

   bugSomething isn't workingSomething isn't working

   windows-osIssues related to Codex on Windows systemsIssues related to Codex on Windows systems

   mcpIssues related to the use of model context protocol (MCP) serversIssues related to the use of model context protocol (MCP) servers

   on Jul 10, 2026
3. TyceHerrman commented on Sep 5, 2026

   

   TyceHerrman

   on Sep 5, 2026

   More actions

   also issue on macos
4. alisterwayne8-web commented on Sep 21, 2026

   

   alisterwayne8-web

   on Sep 21, 2026 – with ChatGPT Codex Connector

   More actions

   Confirmed on Windows: I hit the same missing Settings → MCP Servers UI, but was able to get a remote OAuth MCP working in Codex Desktop through the CLI/config path.

   Tested setup:

   • Windows
   • Codex CLI 0.155.1
   • n8n 2.39.10 instance-level MCP (Streamable HTTP + OAuth)

   What worked:

   1. Add the MCP server from CLI:

   codex mcp add n8n --url "https://YOUR-N8N-HOST/mcp-server/http"

   2. In %USERPROFILE%\.codex\config.toml, use file-backed OAuth credentials:

   mcp_oauth_credentials_store = "file"

   For the n8n-generated Codex setup, this feature flag was also required in my case:

   [features]
   experimental_use_rmcp_client = true

   Server config:

   [mcp_servers.n8n]
   url = "https://YOUR-N8N-HOST/mcp-server/http"

   3. Re-authenticate:

   codex mcp logout n8n
   codex mcp login n8n

   4. Verify:

   codex mcp list

   This showed n8n -> enabled -> OAuth and created %USERPROFILE%\.codex\.credentials.json.

   5. Fully quit Codex Desktop, relaunch it, and start a new thread. After that, Desktop was able to call the n8n MCP tools and list workflows successfully.

   So the missing Settings UI did not block MCP usage, but the CLI/config route was required. This also appears related to the Windows OAuth persistence issue in #28201.

   Security note: mcp_oauth_credentials_store = "file" stores OAuth credentials in .codex\.credentials.json, readable by the same user context. This is a workaround, not the ideal long-term fix.