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file-upload-security

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Accept, store, process, and serve user uploads safely: type-appropriate content validation, decompression limits, generated storage keys, quarantine before publication, isolated media processing, and scoped direct-to-storage credentials. Use when generating a file-upload endpoint, wiring presigned or SAS uploads to S3, GCS, or Azure Blob, processing user-supplied images or documents, or serving user-generated content.

skills/file-upload-security/SKILL.md

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# File Upload Security

## Rules (for AI agents)

### ALWAYS
- Put every new upload in a **non-public quarantine** location, and do not expose it,
  link it, index it, or hand it to a downstream workflow until validation has
  succeeded. Quarantine → validate → process → publish, in that order. This is the
  invariant the rest of these rules hang from, and the one direct-to-storage uploads
  most often skip.
- Validate content **server-side with checks appropriate to the format**. Where a
  format has a reliable signature, verify it; for container and document formats —
  DOCX, XLSX and ZIP are all ZIP at the container level — also validate structure
  against the format you expect. Text-based formats such as SVG and CSV have no