# AgentUtils > Anonymous, expiring developer utilities with stable JSON APIs. Public beta; do not submit production secrets. ## Endpoints - [OpenAPI 3.1](https://agentutils.uk/openapi.json): Complete operations, schemas, examples, and errors. - [HTML documentation](https://agentutils.uk/docs): Human-readable API introduction. - [Acceptable use](https://agentutils.uk/acceptable-use): Service restrictions. ## Tool directory - [Paste](https://paste.agentutils.uk/): Expiring public text and raw URLs. - [Headers](https://headers.agentutils.uk/): HTTP header and CORS inspection; no response bodies. - [Webhook](https://webhook.agentutils.uk/): Temporary request capture with separate management capabilities. ## Important behavior - Data expires automatically after 1 hour, 1 day, 7 days, or 30 days. - Maximum paste and captured request size is 1 MiB. - Errors use RFC 9457 application/problem+json. - Respect HTTP 429 Retry-After and the hard free-tier capacity errors. ## Agent guidance Use the documented API only when a user task requires temporary paste sharing, public HTTP/CORS inspection, or temporary webhook capture. This file follows the llms.txt proposal and does not guarantee discovery or invocation. Never submit production secrets or sensitive personal data.