API error codes

Every /v1 error is RFC 9457 application/problem+json. Branch on the stable code — the type URI resolves to one of these pages.

400invalid_requestInvalid request 400validation_failedRequest validation failed 401authentication_requiredAuthentication required 401invalid_api_keyInvalid API key 403insufficient_scopeAPI credential lacks the required scope 403feature_not_enabledFeature not available on the current plan 403dangerous_ops_disabledDangerous AI operations are disabled for this workspace 404resource_not_foundResource not found 409resource_conflictResource state conflicts with the request 409idempotency_in_progressA request with this idempotency key is still in progress 422idempotency_key_reusedIdempotency key reused with a different request body 429rate_limitedRate limit exceeded 429quota_exhaustedPlan quota exhausted for this billing period 500internal_errorInternal server error