Tool Contract Versioning: Pinning agents to prevent silent outages
blaizedsouza · x · 2026-08-23
Developer AiCamila highlights that tool changes can break every agent that calls them, emphasizing the need to pin contracts.
Tool Versioning Cheatsheet:
- Version the input and output schema.
- Pin each agent to a contract version.
- Add fields in a backward safe way.
- Remove fields only in a new version.
- Test old agents against new versions.
- Retire unused versions on a date.
Core principle: Silent tool changes are silent outages. Pro tip: Treat a tool schema like a public API.
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