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/.

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