# Step Parts > Find, evaluate, and download low-level common standard CAD parts from step.parts, such as screws, bolts, nuts, washers, bearings, standoffs, electronics parts, motors, connectors, and other off-the-shelf components. Use when Codex needs to search the hosted step.parts catalog, resolve fuzzy part names, standards, aliases, or dimensions, choose a matching part, fetch a canonical .step file, verify… - **Type:** Skill - **Install:** `agentstack add skill-earthtojake-step-parts-step-parts` - **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior - **Seller:** [earthtojake](https://agentstack.voostack.com/s/earthtojake) - **Installs:** 0 - **Category:** [Search](https://agentstack.voostack.com/c/search) - **Latest version:** 0.1.0 - **License:** MIT - **Upstream author:** [earthtojake](https://github.com/earthtojake) - **Source:** https://github.com/earthtojake/step.parts/tree/main/skills/step-parts - **Website:** https://www.step.parts ## Install ```sh agentstack add skill-earthtojake-step-parts-step-parts ``` Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent. ## About # CAD Parts ## Overview Use the hosted step.parts machine endpoints instead of scraping HTML or relying on local repository files. Treat `https://api.step.parts` as the canonical API origin and `https://www.step.parts` as the site/static-asset origin unless the user provides a different hosted mirror. If the domain does not resolve or the API is unavailable, report that the hosted service is not reachable yet instead of falling back to repo-specific assumptions. ## Quick Workflow 1. Interpret the requested part into search terms and optional facets: - `q` for fuzzy tokens, standards, aliases, dimensions, source/product URLs, and attribute names/values. - `category`, `family`, `standard`, or `tag` when the user gives an exact facet. 2. Search `/v1/parts` and inspect `items`, `total`, and `facets`. 3. If results are ambiguous, present the best few options with `id`, `name`, `standard`, and key attributes before choosing. If one result clearly matches, return the selected record details without downloading unless the user asked for a local STEP file. 4. When the user asks to download or save a STEP file, download its `stepUrl`, then verify the file with the record's `sha256` when present. 5. Return the local path when downloaded, plus the selected part id and page/API URLs so the user can trace provenance. ## Bundled Downloader Use `scripts/download_step_part.py` for deterministic search, download, and checksum verification: ```bash python skills/step-parts/scripts/download_step_part.py "M3 socket head 12" --download --out-dir /tmp/step-parts python skills/step-parts/scripts/download_step_part.py --id iso4762_socket_head_cap_screw_m3x12 --download --out-dir /tmp/step-parts python skills/step-parts/scripts/download_step_part.py "bearing 608zz" --limit 5 ``` Useful options: - `--origin`: override `https://api.step.parts` only when the user provides another hosted API origin. - `--tag`, `--category`, `--family`, `--standard`: repeatable facet filters. - `--out-dir`: directory for downloaded STEP files. Defaults to `/tmp/step-parts`. - `--all`: with `--download`, download every result on the returned page as individual STEP downloads. - `--overwrite`: replace an existing output file. The script prints JSON to stdout. For searches, it prints matched records. For downloads, it prints saved file paths, checksums, and source URLs. ## API Reference Read `references/step-parts-api.md` when you need endpoint details, field meanings, or query semantics. Prefer: - `/v1/parts` for filtered search with absolute asset URLs. - `/v1/parts/{id}` for one enriched record. - Returned `stepUrl` for STEP downloads. - `/v1/catalog/parts.index.json` for a compact discovery index. - `/v1/catalog/schema` for field and family attribute meanings. - `/v1/openapi.json` when generating a client or tool. ## Search Guidance - Query tokens are ANDed by the API, so start specific but not overconstrained. For example, use `M3 SHCS 12` before adding exact family and standard filters. - Values within one facet are ORed together, and selected `tag`, `category`, `family`, and `standard` fields are ANDed together. Use exact facets to narrow within known categories, then rank manually by name and attributes. - Standards can be queried as `ISO 4762`, `ISO4762`, or the exact `standard.designation`. - The `attributes` object contains family-specific facts such as `thread`, `lengthMm`, `bore1Mm`, `material`, `profileSeries`, `slotSizeMm`, and dimensions in millimeters. - Part, GLB, and PNG URL patterns are predictable on `https://www.step.parts`; STEP URLs are environment-aware and may resolve to GitHub LFS media in production. Use catalog/API `stepUrl` for downloads. ## Source & license This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code. - **Author:** [earthtojake](https://github.com/earthtojake) - **Source:** [earthtojake/step.parts](https://github.com/earthtojake/step.parts) - **License:** MIT - **Homepage:** https://www.step.parts Install and usage instructions live in the source repository linked above. ## Pricing - **Free** — Free ## Security capabilities Automated source analysis of v0.1.0 — what this tool can access: - **Network access:** no - **Filesystem access:** no - **Shell / process execution:** no - **Environment & secrets:** no - **Dynamic code execution:** no *"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.* ## Versions - **0.1.0** — security scan: passed — Imported from the upstream source. ## Links - Listing page: https://agentstack.voostack.com/l/skill-earthtojake-step-parts-step-parts - Seller: https://agentstack.voostack.com/s/earthtojake - Browse the marketplace: https://agentstack.voostack.com/browse --- Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.