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API referenceidentity

Register oauth client

POST/v1/oauth/register

Dynamic client registration for MCP clients (RFC 7591; deprecated by MCP 2026-07-28, served for older clients)

DEPRECATED by the MCP authorization specification revision 2026-07-28, which prefers Client ID Metadata Documents (pass the document's https URL as client_id instead); served for MCP clients that…Show moreDEPRECATED by the MCP authorization specification revision 2026-07-28, which prefers Client ID Metadata Documents (pass the document's https URL as client_id instead); served for MCP clients that implement only RFC 7591. Public clients only: token_endpoint_auth_method is none and PKCE S256 is mandatory at authorize, so no client secret is ever issued. Rate limited per client address (details.action oauth-register). Not envelope-shaped (see the identity tag).

Request body

  • client_namestringOptional
    Shown on the consent screen with the UNVERIFIED badge; it is self-asserted
  • redirect_urisarray of stringOptional
    https URLs or loopback IP literals; required unless grant_types is the device_code grant only
  • grant_typesarray of stringOptional
    • authorization_code
    • refresh_token
    • urn:ietf:params:oauth:grant-type:device_code
  • response_typesarray of stringOptional
    • code
  • token_endpoint_auth_methodstringOptional
    • none
  • client_uristring · uriOptional
  • logo_uristring · uriOptional
  • software_idstringOptional
  • software_versionstringOptional

Responses

  • 201RegisteredOAuthClientRegistrationResponse
  • 400RFC 7591 section 3.2.2 refusal — invalid_redirect_uri or invalid_client_metadataOAuthError
  • 404NOT_FOUND — unknown or expired ref (unguessable refs, 15)ApiErrorResponse
  • 405
    VALIDATION — the public edge serves GET, POST, PUT, PATCH and DELETE only; any other method is refused before the platform sees it (details.reason METHOD_NOT_ALLOWED, details.source edge).Show moreVALIDATION — the public edge serves GET, POST, PUT, PATCH and DELETE only; any other method is refused before the platform sees it (details.reason METHOD_NOT_ALLOWED, details.source edge). Not retryable as sent.
    ApiErrorResponse
  • 413
    VALIDATION — the request body is larger than the surface's limit.Show moreVALIDATION — the request body is larger than the surface's limit. Not retryable as sent: shrink the body. Declared on every operation that takes a request body. details carries exactly one key, maxBodyBytes (integer): the limit that applies to this surface, in bytes.
    ApiErrorResponse
  • 414
    VALIDATION — the request URI (path and query string) is longer than 8 KiB; the public edge refuses it before the platform sees it (details.reason URI_TOO_LONG, details.source edge).Show moreVALIDATION — the request URI (path and query string) is longer than 8 KiB; the public edge refuses it before the platform sees it (details.reason URI_TOO_LONG, details.source edge). Not retryable as sent: send long input in the body of a POST.
    ApiErrorResponse
  • 415
    VALIDATION — a request body that is not JSON (application/json or application/*+json; a form body only on the OAuth token routes).Show moreVALIDATION — a request body that is not JSON (application/json or application/*+json; a form body only on the OAuth token routes). The public edge refuses it before the platform sees it (details.reason UNSUPPORTED_MEDIA_TYPE, details.source edge). Not retryable as sent: send Content-Type application/json. Declared on every operation that takes a JSON request body.
    ApiErrorResponse
  • 429
    Counted in fixed windows (default 15 min).Show moreCounted in fixed windows (default 15 min). The signup, login, password and invite routes count every attempt per client address AND per subject (the email, the username + site, or the invite token). POST /v1/oauth/token is counted three ways, none of them on client_id alone, so knowing a client_id (which is not secret) never lets anyone spend its holder's budget: oauth-token counts every attempt per client address only; oauth-token-failure counts FAILED client authentications per client address and per (client address, client_id) pair; oauth-token-issued counts tokens issued per client_id only, and only a request whose secret, grant_type and scope all passed can spend it. details.reason says which limit tripped (CLIENT_RATE_LIMITED | SUBJECT_RATE_LIMITED) and details.action which count (signup | signup-verify | login | password-forgot | password-reset | invite-accept | oauth-token | oauth-token-failure | oauth-token-issued). Retry-After is whole seconds to the end of the window, and details.retryAfterMs mirrors it. The answer is the same whether or not the account or key exists, so the limit cannot be used to enumerate accounts, and nothing the caller sent is echoed. adds three counts per client address for the MCP grant routes: oauth-authorize (GET /v1/oauth/authorize, which may fetch a Client ID Metadata Document), oauth-register (POST /v1/oauth/register) and oauth-device (POST /v1/oauth/device_authorization), and one count per MCP grant, oauth-exchange-grant (the token exchange of POST /v1/oauth/token, counted per grant after the exchange client and the subject token verified, default 120 a minute), whose details.reason is EXCHANGE_RATE_LIMITED.
    ApiErrorResponse
  • 500INTERNAL — a bug, and traceId is the support handle.ApiErrorResponse

Errors you should handle

Branch on code and honour retryable — never on the HTTP status alone.

404NOT_FOUND
searchRef SR-F-7b31d0a9 is unknown or has expired; re-search
not retryable
405VALIDATION
This method is not served.
not retryable
413VALIDATION
The request body is larger than this API accepts (262144 bytes).
not retryable
414VALIDATION
The request URI is longer than 8 KiB.
not retryable
415VALIDATION
Send application/json.
not retryable
429RATE_LIMITED
Too many requests of this kind for this address or account. Wait for the Retry-After interval before trying again.
retryable
500INTERNAL
An unexpected error occurred. Quote the traceId to support.
retryable