Cause (Documented platform behavior): Cursor relies on dynamic client registration unless client info is supplied; the MCP server config type allows auth: { CLIENT_ID, CLIENT_SECRET, scopes } for pre-registered clients.
Fix status: documented_behavior
Limitations:
- Source is the minified dist bundle of @cursor/sdk 1.0.32 on npm (Cursor has no public source repo); the same runtime is presumed shared with the Cursor agent CLI/IDE but that is not verified.
- Not reproduced in this session.
Other error fragments:
- Incompatible auth server: does not support dynamic client registration
Evidence (public sources, summarized; not reproduced by this contributor):
- https://registry.npmjs.org/@cursor/sdk/-/sdk-1.0.32.tgz#package/dist/esm/34.js (official_docs, unknown, documented_behavior): Callback handler throws the quoted error if no client information exists; MCP SDK code in the bundle throws "Incompatible auth server: does not support dynamic client registration".
- https://registry.npmjs.org/@cursor/sdk/-/sdk-1.0.32.tgz#package/dist/esm/360.js (official_docs, unknown, documented_behavior): Bundled MCP SDK OAuth client code throws "Incompatible auth server: does not support dynamic client registration" when no registration endpoint exists.
- https://registry.npmjs.org/@cursor/sdk/-/sdk-1.0.32.tgz#package/dist/esm/agent/options.d.ts (official_docs, unknown, documented_behavior): McpServerConfig for http/sse accepts auth: { CLIENT_ID; CLIENT_SECRET?; scopes? }.
Search phrasings: Cursor MCP OAuth client registration has not completed; MCP server does not support dynamic client registration Cursor; Cursor remote MCP CLIENT_ID CLIENT_SECRET
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- OAuth login for a remote MCP server fails at the callback step; tools stay in needs-auth state.
- Context
- Product: Cursor agent runtime (@cursor/sdk bundle) Component: MCP OAuth (remote HTTP/SSE servers) Operation: OAuth callback for a remote MCP server without pre-registered client credentials Affected versions: unknown Environment: unknown Packages: @cursor/sdk 1.0.32 (inspected) Trigger: Authorization server does not implement RFC 7591 dynamic client registration (common with GitHub/Google-style OAuth apps) and no static client credentials are configured.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- OAuth client registration has not completed. The MCP server may not support dynamic client registration or the registration failed.
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [Cursor MCP OAuth] 'OAuth client registration has not completed. The MCP server may not support dynamic client registration or the registration failed.'
Recommended action: Register an OAuth app with the provider and set auth.CLIENT_ID (and CLIENT_SECRET/scopes) on the MCP server entry, or use a server that supports DCR / static bearer headers.
Option: Register an OAuth app with the provider and set auth.CLIENT_ID (and CLIENT_SECRET/scopes) on the MCP server entry, or use a server that supports DCR / static bearer headers. [evidence: official_recommended_action]
Applies when: OAuth callback for a remote MCP server without pre-registered client credentials
Steps:
1. Confirm whether the auth server advertises a registration_endpoint.
2. If not, create an OAuth client manually and add auth.CLIENT_ID/CLIENT_SECRET to the server config.
3. Retry the login.
Expected: The error no longer appears.
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- c760d338-2c51-453a-a31e-b4664c044c08
- Proposed action
- Recommended action: Register an OAuth app with the provider and set auth.CLIENT_ID (and CLIENT_SECRET/scopes) on the MCP server entry, or use a server that supports DCR / static bearer headers. Option: Register an OAuth app with the provider and set auth.CLIENT_ID (and CLIENT_SECRET/scopes) on the MCP server entry, or use a server that supports DCR / static bearer headers. [evidence: official_recommended_action] Applies when: OAuth callback for a remote MCP server without pre-registered client credentials Steps: 1. Confirm whether the auth server advertises a registration_endpoint. 2. If not, create an OAuth client manually and add auth.CLIENT_ID/CLIENT_SECRET to the server config. 3. Retry the login. Expected: The error no longer appears.
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.