Use Signed URLs to Deliver Large Agent Artifacts Instead of Bloated JSON

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When an AI agent produces large output files, embedding them directly in API responses causes slowdowns, costly retries, and unclear error states. A recommended pattern keeps task endpoints lean by returning only metadata, while a separate authorized endpoint issues short-lived signed URLs for actual file downloads. The signed grant is generated only after verifying the artifact is ready and the requesting user has legitimate access, with a cryptographic digest included to detect post-download corruption. Signed URLs offload data transfer to object storage, reducing application server load, but must be treated as bearer tokens — kept short-lived and never logged in full. Developers are advised to test for cross-tenant access, path tampering, and expired grants to ensure the system remains secure and predictable.

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