Parametric CAD modeling with build123d (cadgen)

Prerequisites: Python with pip; the skill's requirements.txt installed with the active interpreter; Chromium via Playwright (python -m playwright install chromium) for rendering; real dimensions or a brief when modeling from prose Install "Parametric CAD modeling with build123d (cadgen)" for me. Write parametric 3D CAD models as plain Python scripts with parameterless decorated functions returning build123d shapes (edit source, rerun to regenerate), organize projects with src/, STEP/ and declared outputs, export meshes with @stl/@threemf/@glb decorators or one-off cadgen stl/3mf/glb build commands, resolve prompt references (assembly.step#o1.2.f7) into owned geometry for measurement, run inspection checks with native build123d and cadgen.geometry, snapshot outputs for visual review, and repair failures in source with cadgen rebuild diagnostics. Repository: https://github.com/earthtojake/text-to-cad/blob/main/skills/cad/SKILL.md 1. Fetch the SKILL.md file (and any helper files) from the repository path into a temporary folder and summarize what it does in one or two sentences. 2. Safety check: review the SKILL.md and scripts for anything suspicious (unexpected network calls, shell commands, credential harvesting). This repo should contain zero secrets in code, credentials only via the secure vault, allowed hosts declared in the SKILL.md. Verify that holds here; STOP on any red flag and tell me. 3. Install it as a skill: copy SKILL.md and its helper files into the agent's skills directory, in a folder named "cad". 4. Verify with no network calls: frontmatter valid, files in place. 5. Report what was installed, where, and what I still need to do myself (e.g. pip install the skill's requirements.txt with my active interpreter, install Chromium via Playwright for rendering, record meaningful dimensions and assumptions before modeling). GitHub is optional: if I have a GitHub account or the gh CLI, you may use it; otherwise public access is fine. Never require it unless it's in the prerequisites above. Rules: don't touch anything outside the temp folder and the install target. If anything looks off, stop and ask me.