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backend/agent/skills/cad-engine/SKILL.md

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+# CAD Engine Skill
+
+## Purpose
+
+Help an AI agent generate CAD models through the repository's CDSL engine.
+
+## Required workflow
+
+1. Read the engine README and the relevant engine modules.
+2. Search the official CDSL library for similar parts, profiles, and feature
+   sequences.
+3. Produce or revise parameterized CDSL.
+4. Validate that the CDSL can run through the `cdsl_only` path.
+5. Compile the CDSL and generate a STEP file.
+6. Return the generated artifact, validation result, and library references.
+
+## Hard constraints
+
+- Prefer named profiles and discrete semantic parameters over raw coordinates.
+- Do not use `compiler_context` as the final source of missing training data.
+- Keep the generated CDSL self-sufficient whenever the supported shape
+  generators can express the geometry.
+- Preserve the original CDSL and write revisions as separate artifacts.