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1. Identify which tools you actually use; assume no paths. 2. Check free space on the affected volume with OS tools. 3. Ask each tool for its location where documented: uv cache dir, pip cache info, Docker Desktop Settings > Advanced. 4. Measure read-only where documented: pip cache info, docker buildx du, npm cache ls, git count-objects -v. 5. For Git, run git worktree list; do not delete Codex checkpoint refs or objects; cleanup is UNKNOWN. 6. For model caches, update huggingface_hub and list repositories you still need; re-download cost is unknown. 7. For Cypress, check configured output folders for non-test files or evidence you need. 8. For Xcode and Android, inspect only; state loss is possible and scope is unproven. 9. Never classify Docker volumes as safe cache. 10. Reclaim only if needed: use the narrowest documented command for the one relevant cache, after confirming no dependent process or install is active; npm cache clean --force only for deliberate reclamation. 11. Re-measure; reclamation is not guaranteed. 12. Back up anything classed DELETES_USER_DATA, DELETES_DEVICE_STATE or DELETES_MODEL_DOWNLOADS. Nothing here was executed.