project-api-validation git:20260902.749d57bA

Immutable. This exact content is served forever at /api/v1/blob/569c365eb5bc0ffd.

---
name: project-api-validation
description: Preserve this project's public request validation and error catalog.
---

# Project API validation

Reject invalid public request values before side effects, preserve the structured
error envelope, update the error catalog for new codes, and run the API contract
check. Do not use this Skill for internal signal algorithms.