design-modifylisted

# design:modify — Spec-Aware Design Changes with Safety Checks ## What This Skill Does Given a FAIL item from a `design:review` output (or a direct change request from Tyler), modifies `design_spec.py` safely: 1. **Constraint simulation** — compute all 4 aisle clearances BEFORE writing any file 2. **Feasibility check** — reject changes that resolve one FAIL but introduce another 3. **Safe spec editor** — validate Python syntax and import before applying 4. **Pipeline runner** — execute `pixi run permit-docs`, detect silent failures 5. **Diff reporter** — show what changed in spec and which PDFs were regenerated Never writes to `design_spec.py` without passing all safety checks. --- ## Prerequisites - `design_spec.py` importable: `python3 -c "from design_spec import SPEC" # exit 0` - `pixi run permit-docs` runs clean on current spec - `~/.claude/skills/pdf-proof/.venv` contains ezdxf, Pillow, PyMuPDF - `.design-loop/` directory exists (or create it: `mkdir -p /home/tstapler/Documents/711-N60th-Plans/.design-loop/`) --- ## Step 1: Constraint Simulation (BEFORE any file write) The simulation runs in Claude's reasoning using SPEC field values. No subprocess. All formulas use `/ 25.4` for mm-to-inch conversion explicitly. ### 1a: Load current SPEC values ```python from design_spec import SPEC # Kitchen interior corners (mm) KI_W = SPEC.kit_w_out_mm + SPEC.ext_thk_mm KI_S = SPEC.kit_s_out_mm + SPEC.ext_thk_mm KI_N = KI_S + SPEC.kit_ns_mm KI_E = KI_W + SPEC.kit_ew_mm #