# Extension specifications

- [AgentTeam Extension Package and Runtime Specification](./extension-platform.md)
- [Search Engine Apps and Builtin Extensions](./search-engine-apps.md)
- [arXiv App and Builtin Extension](./arxiv-app.md)

`extension-platform.md` is the normative contract for both Builtin Extensions
and OpenAPI-derived External Extension Packages. A future authoring Agent can
use it to translate a reviewed OpenAPI document into a deterministic Package;
the AgentTeam runtime only loads, validates, registers, and invokes that Package.

The repository intentionally does not ship a dedicated OpenAPI authoring
binary. Runtime consumers must not parse OpenAPI or invent missing Package
fields during invocation.