| idempotency_key_required | 400 | A mutating operation arrived over HTTP with no Idempotency-Key header. It is refused before the body is parsed, so a caller missing both learns about both at once. | Add an Idempotency-Key header of up to 128 characters, unique to this request. Over MCP the same value goes in the idempotencyKey tool argument. |
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| validation_failed | 400 | The merged path, query and body did not match the operation's schema. The schemas are strict, so an unknown field is a failure rather than something ignored, and a string carrying half of a character is refused before it can be stored. | Read details.issues. Each entry carries a path, a message and a machine readable code. Fix every named field and send the request again; the same body always fails the same way. |
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| unauthorized | 401 | No credential was presented, or the key is unknown, revoked or expired, or an X-API-Key header carried something that is not an API key. details.reason says which. | Send Authorization: Bearer gsk_live_…. A revoked or expired key never starts working again, so issue a new one in the developer console. Put a dashboard session token in Authorization, never in X-API-Key. |
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| email_unverified | 403 | The operation declares a verified email and the owning account's address is not verified. A key reads the account's current fact, not the fact that was true when the key was issued. | Verify the address on the account, then retry. The key does not need to be reissued. |
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| forbidden_scope | 403 | The credential does not carry every scope the operation declares, or it is the wrong kind of credential for it. keys.* and assistant.* are user only and can never be called by a key. | details.requiredScopes and details.missingScopes name what is missing. A key's scopes cannot be changed after it is issued, so create a new key with them. When details.allowedActors is present, no key can call this operation at all. |
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| not_found | 404 | No resource of that id belongs to this account. A resource that belongs to somebody else answers 404 as well, never 403. | Check the id. Do not treat this as a permissions problem. |
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| conflict | 409 | The request conflicts with the state the resource is in, and no more specific code applies. | Re-read the resource and decide from its current state. Retrying the same request unchanged will not help. |
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| idempotency_conflict | 409 | That idempotency key has already been used on this operation with a different request body. | Use a fresh key for a different request. A key stands for one intent, not for one attempt. |
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| idempotency_in_progress | 409 | The first request under that key is still being worked. Two concurrent identical requests both reach the store and one of them is told this. | Wait the Retry-After seconds, which is 2, and send exactly the same request again with the same key. Do not change the body and do not mint a new key. |
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| payload_too_large | 413 | The request body is over the transport's limit: 256 kb over HTTP, 1 mb over MCP. | Send less. details.limit carries the limit. Version 1 has no upload operations, so a body this size is usually a mistake. |
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| unsupported_media_type | 415 | The request carried a body whose Content-Type is not application/json, whose charset is not utf-8, or whose Content-Encoding this API does not decode. A body nobody can read would otherwise be silently discarded. | Send Content-Type: application/json and utf-8 bytes. details names the charset, encoding or content type that was objected to. |
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| rate_limited | 429 | The credential's per minute budget, the account's per minute ceiling, or a daily cap was exceeded. details.scope is minute, day or account, or global when the product's own daily cap on voice previews is spent. | Wait the Retry-After seconds and retry. details.limit and details.resetAt say what was hit and when it reopens. The RateLimit-* headers on every answer let a client pace itself before it gets here. |
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| internal_error | 500 | An unhandled failure inside this API. The original message is logged and never answered. | Retry once, then quote requestId to support. A 5xx deletes the idempotency claim rather than storing it, so retrying under the same key is safe. |
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