# ExQuiddity v0.1.2 - API Reference

## Modules

- [Quiddity.Api](Quiddity.Api.md): The engine's operations, as data — and the stubs generated from it.
- [Quiddity.Mcp.Tools](Quiddity.Mcp.Tools.md): The tools the MCP server offers, and the one place a name becomes a function.
- [Quiddity.Native](Quiddity.Native.md): The Rust engine: `quiddity` for what a part's features are, `haecceity` for
where its surfaces are.
- [Quiddity.Recognition](Quiddity.Recognition.md): What quiddity recognised in a part: its features, and what every face is.

- Geometry
  - [Quiddity](Quiddity.md): Manufacturing features of a STEP part, and the geometry under them, from
Elixir.
  - [Quiddity.Camera](Quiddity.Camera.md): A pinhole camera: where a sensor is, what it looks along, and how wide it sees.
  - [Quiddity.Face](Quiddity.Face.md): One face of a part: what kind of surface it is, how big it is, which way it
faces, and what it touches.
  - [Quiddity.Frame](Quiddity.Frame.md): One camera frame of a part: what each pixel landed on.
  - [Quiddity.Part](Quiddity.Part.md): A STEP part, read once and asked about as often as you like.

- Scenes
  - [Quiddity.Mjcf](Quiddity.Mjcf.md): A part as a MuJoCo scene: the triangles quiddity meshed, as an MJCF model.

- Model Context Protocol
  - [Quiddity.Mcp](Quiddity.Mcp.md): A Model Context Protocol server over stdio: a STEP part, for an assistant.

- Exceptions
  - [Quiddity.Error](Quiddity.Error.md): A refusal from the engine, with the code a caller can branch on.

## Mix Tasks

- [mix quiddity.mcp](Mix.Tasks.Quiddity.Mcp.md): Runs the Model Context Protocol server: one JSON-RPC message per line on
stdin, one answer per line on stdout, until stdin closes.