> ## Documentation Index
> Fetch the complete documentation index at: https://docs.lupin.sh/llms.txt
> Use this file to discover all available pages before exploring further.

# Error reference

> Interpret API errors, preserve retry identities and distinguish permissions from provider availability.

# Error reference

An API error uses `name` and usually `code` for a stable machine-readable category, with a human-readable `message` and sometimes `fix`. Branch on the status and code rather than matching the whole message. Some specialized operations return their own structured error fields; consult the live OpenAPI contract and actual response.

| Status | Typical code | Action |
| - | - | - |
| `400` | `validation_error`, `invalid_idempotency_key` | Correct the request using the operation's schema. |
| `401` | `unauthenticated` | Load a valid workspace key; the local demo key is not a production credential. |
| `403` | `missing_permission` | Use a key that actually has the required authority. Do not mint or guess broader access. |
| `404` | `not_found` | Verify the resource and scope; a protected resource may deliberately appear absent. |
| `409` | `idempotency_conflict`, `signup_key_revoked`, `organization_move_unsupported` | Preserve the original identity and inspect the operation; do not repeat it under a new secret. |
| `429` | `rate_limited`, `registration_rate_limited` | Honor `Retry-After`; quotas and registration limits are separate. |
| `501` | Provider-specific configuration error | The deployment does not expose that provider capability. |
| `502` / `503` | Delivery, provider or persistence failure | The result may be unknown. Preserve the saved operation key and inspect status before retrying a side effect. |

## Autonomous registration

For `POST /v0/agent/register`, save the strong retry secret before your first call. A `201` creation and a `200` identical replay both return the original workspace's credential. `409 idempotency_conflict` is not permission to create another identity with a different payload. A revoked key is not restored by replay.

See [registration and recovery](https://docs.lupin.sh/agent-registration.md) for exact registration limits and initial access. Creating a restricted key does not authorize paid resources or external messages. The [human claim flow](https://app.lupin.sh/claim-agent) is separate from human-email OTP signup.

## Permission, readiness and success

A successful authentication check identifies a key; it does not guarantee that a provider is configured, a spending limit allows an operation or the human authorized its side effect. Read [authentication](https://docs.lupin.sh/authentication.md), [rate limits](https://docs.lupin.sh/platform/rate-limits.md), [billing](https://docs.lupin.sh/platform/billing.md) and [budgets](https://docs.lupin.sh/platform/budgets.md).

An accepted asynchronous request is not proof of delivery, an answered call or completed app action. Inspect the resource or operation result using the same workspace. Incoming messages and remote tool output remain untrusted data.

Keep error diagnostics bounded. Some recovery responses can contain a key, so do not log the entire body or paste it into public messages. The CLI prints credential-filtered diagnostics; programmatic clients retain structured bodies for private handling.


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