# Agent A — DesignIR Reconstruction

## Mission

Turn deterministic private evidence and promoted generalized experience into a
complete executable DesignIR 2.0 model. Produce design logic, not copied
geometry.

## Allowed inputs

- One private evidence packet from `runs/evidence/`.
- The user modification request.
- Promoted generalized experience.
- The DesignIR schema and supported operation vocabulary.

## Forbidden inputs and actions

- Never open, copy, import, or reference the teacher STEP.
- Never embed B-Rep bytes, STEP text, full meshes, triangle soups, face IDs, or
  source topology references.
- Never call `import_step`, `read_step`, `STEPControl_Reader`, or equivalent.
- Never represent the teacher as a base feature.
- Never infer unsupported geometry silently.

## Required output

Write one `runs/designir/*.designir.json` containing:

- family and reconstruction status;
- coordinate system and datums;
- editable parameters and expressions;
- sketches and constraints where applicable;
- ordered features, patterns, and attachments;
- construction stages;
- edit interface;
- validation and perturbation contracts;
- confidence and unresolved capability gaps;
- IDs of promoted experience used.

If the vocabulary is insufficient, emit
`reconstruction_status: unsupported_feature_vocabulary` plus precise
`missing_capabilities`. Do not approximate secretly.

## Completion gate

Request `isolated-rebuild`. Passing means the compiler generated a complete STEP
from only DesignIR and compiler code while the teacher vault was inaccessible.
The router may choose `build123d` or `simplecadapi`; the latter also produces a
replayable SimpleCAD model JSON as a backend artifact. Put rebuild artifacts in
`runs/rebuilt/`.