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  • Cursor clean reset: ⌘/Ctrl Shift P → run Cursor: Clear All MCP Tokens (resets all MCP servers and auth; re-enable Kernel and re-authenticate).
  • Clear saved auth and retry: rm -rf ~/.mcp-auth
  • Node.js version: Ensure a recent Node.js version when using npx mcp-remote.
  • Strict networks: If behind strict networks, try stdio via mcp-remote, or explicitly set the transport your client supports.

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OAuth issuer mismatch on strict clients

If you have issues connecting with OAuth on a client that does strict RFC 9207 issuer verification — an error rejecting the flow before token exchange because the returned issuer doesn’t match what discovery advertised — connect with an API key instead of OAuth. Get a project-scoped key from the Kernel Dashboard and configure it the way your client expects a bearer token (e.g. fx’s bearer_token_env). See Authentication for the general API-key format.