letsauth

Server

Vercel

Endpoint
https://mcp.vercel.com/
Transport
Streamable HTTP
Authentication as listed
oauth2.1 (the source's own label, not an observation)
Why it is listed
Listed because it appears in a public directory of MCP servers. Source
Homepage
https://vercel.com
  • Supported 1
  • Partial 1
  • Unknown 21

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Status against MCP Authorization 2026-07-28 (current revision). Older revisions: 2025-11-25

MCP server features

FeatureLevelStatusObservedEvidence
Protected Resource Metadata servedmcp.prm · Discovery · Authorization Server Discovery › Authorization Server LocationMUSTUnknown (no observation)no observation yet
PRM lists an authorization servermcp.prm.authorization-servers · Discovery · Authorization Server Discovery › Authorization Server LocationMUSTUnknown (no observation)no observation yet
PRM lists scopes_supportedmcp.prm.scopes-supported · Discovery · Authorization › Scope Selection StrategyMAYUnknown (no observation)no observation yet
PRM reachable at a well-known URImcp.prm.well-known · Discovery · Authorization Server Discovery › Protected Resource Metadata Discovery RequirementsMUSTUnknown (no observation)no observation yet
resource_metadata in the 401 challengemcp.prm.www-authenticate · Discovery · Authorization Server Discovery › Protected Resource Metadata Discovery RequirementsMUSTUnknown (no observation)no observation yet
403 insufficient_scope for step-upmcp.rs.insufficient-scope · Authorization · Authorization › Scope Challenge HandlingSHOULDUnknown (no observation)no observation yet
Scope in the WWW-Authenticate challengemcp.rs.scope-challenge · Authorization · Authorization › Scope Selection StrategySHOULDUnknown (no observation)no observation yet
No offline_access in advertised scopesmcp.prm.no-offline-access · Tokens · Authorization › Refresh TokensSHOULDUnknown (no observation)no observation yet
401 for missing or invalid tokensmcp.rs.401-on-invalid · Tokens · Authorization › Token HandlingMUSTUnknown (no observation)no observation yet
Audience validationmcp.rs.audience-validation · Tokens · Security Considerations › Access Token Privilege RestrictionMUSTUnknown (no observation)no observation yet
Bearer token only in the Authorization headermcp.rs.bearer-header · Tokens · Authorization › Access Token UsageMUSTUnknown (no observation)no observation yet
No token passthrough to upstream APIsmcp.rs.no-passthrough · Delegation · Security Considerations › Access Token Privilege RestrictionMUSTUnknown (no observation)no observation yet
Per-client consent on proxy serversmcp.proxy.consent · Consent · Security Considerations › Confused Deputy ProblemMUSTSupportedVendor claim · jbspeakr (documentation pass with Claude Code)source— "Vercel MCP protects against confused deputy attacks by requiring explicit user consent for each client connection" (Vercel acts as its own authorization server rather than a proxy; recorded because the per-client consent behaviour is explicitly stated. The blog post also states: 'We maintain an allowlist of approved clients and require an OAuth consent screen on every connection.' (https://vercel.com/blog/introducing-vercel-mcp-connect-vercel-to-your-ai-tools))

Authorization server features

FeatureLevelStatusObservedEvidence
Metadata issuer matches the discovery URLmcp.as.issuer-match · Discovery · Authorization Server Discovery › Authorization Server Metadata DiscoveryMUSTUnknown (no observation)no observation yet
Authorization server metadata discoverablemcp.as.metadata · Discovery · Authorization Server Discovery › Authorization Server Metadata DiscoveryMUSTUnknown (no observation)no observation yet
Client ID Metadata Documents supportedmcp.as.cimd · Registration · Client Registration › Client ID Metadata DocumentsSHOULDUnknown (no observation)no observation yet
Dynamic Client Registration offeredmcp.as.dcr · Registration · Client Registration › Dynamic Client RegistrationMAYUnknownVendor claim · jbspeakrsourcelists the server as OAuth 2.1 without saying whether Dynamic Client Registration is offered.
Documented pre-registration pathmcp.as.preregistration · Registration · Client Registration › Pre-registrationSHOULDPartialVendor claim · jbspeakr (documentation pass with Claude Code)source— "To ensure secure access, Vercel MCP only supports AI clients that have been reviewed and approved by Vercel. If you're building an MCP client and want it included in the supported clients list below, submit the client review form." (The documented path is a manual allowlist review, not self-service issuance of client credentials; docs do not say whether approved clients receive credentials or are allowlisted by redirect URI.)
Issuer identifier in authorization responsesmcp.as.iss-param · Authorization · Authorization › Authorization Response ValidationSHOULDUnknown (no observation)no observation yet
PKCE with S256 advertisedmcp.as.pkce-s256 · Authorization · Security Considerations › Authorization Code ProtectionMUSTUnknown (no observation)no observation yet
Refresh token rotation for public clientsmcp.as.refresh-rotation · Tokens · Security Considerations › Token TheftMUSTUnknown (no observation)no observation yet
Resource indicators honouredmcp.as.resource-indicator · Tokens · Security Considerations › Token Audience Binding and ValidationMUSTUnknown (no observation)no observation yet
All endpoints served over HTTPSmcp.as.https · Transport · Security Considerations › Communication SecurityMUSTUnknown (no observation)no observation yet