# Stilta Patent Drafter > Given an invention disclosure, retrieve related prior-art snippets from a local corpus via BM25 and draft a structured patent Background and Claims scaffold grounded in the disclosure and retrieved references. - Skill: `riteshkew/stilta-patent-drafter` (Agent Skill, multi-file: 13 files) - Install (CLI): `npx skillmds@latest add riteshkew/stilta-patent-drafter` - Raw SKILL.md: https://api.skillmd.com/api/skills/riteshkew/stilta-patent-drafter/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: riteshkew (https://skillmd.com/u/riteshkew) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/riteshkew/stilta-patent-drafter --- # Workflow When this skill triggers, follow these steps in order. ## Step 1 — Receive the Invention Disclosure Accept a plain-text or Markdown invention disclosure from the user. The disclosure should describe: - The problem being solved - The novel technical features of the invention - Key components or steps of the system or method If the user has not provided a disclosure, ask: > "Please paste or upload your invention disclosure. Describe the problem, the novel features of your invention, and the key components or steps involved." Save the disclosure to a temporary file, e.g. `disclosure.md`. ## Step 2 — Retrieve Prior Art via BM25 Run the dependency-free BM25 retriever over the committed prior-art corpus: ```bash node scripts/retrieve.mjs resources/prior-art/ disclosure.md 3 ``` The retriever: - Tokenizes the disclosure and each corpus document - Scores documents using the BM25 formula (k1=1.5, b=0.75) - Returns the top-K files with scores and matched terms as JSON Capture the JSON output. If the process exits non-zero, report the stderr message to the user and stop. Inspect the top results. For each, note: - The filename (maps to a prior-art reference) - The BM25 score (higher = more relevant) - The matched terms (shows which disclosure concepts overlap with prior art) ## Step 3 — Draft Background and Claims Run the scaffold assembler with the disclosure and retrieval results: ```bash node scripts/draft.mjs disclosure.md retrieval.json draft.md ``` The assembler produces a Markdown file containing: 1. **Background** — situates the invention against the retrieved prior art, citing each reference with its BM25 score and matched terms, followed by a verbatim excerpt of the disclosure. 2. **Claim 1** (Independent) — a system claim listing the key features extracted from the disclosure, in proper patent-claim format ("A system comprising… wherein…"). 3. **Claim 2** (Dependent) — a dependent claim referencing claim 1 and adding a communication interface feature. Present the drafted sections to the user for review. ## Step 4 — Flag Novelty Risks Review the matched terms between the disclosure and the top retrieved prior art. For each prior art reference: - Identify which disclosure features are already described in the prior art (potential novelty risks) - Highlight features that appear only in the disclosure and not in any retrieved reference (potential novel aspects) - Recommend that the user consult a registered patent attorney to evaluate patentability Use this format: ``` Prior Art: [PA-1] Overlapping features: Novelty risk: Novel aspects not found in retrieved prior art: - - ``` ## Example See `examples/input.md` for a worked invention disclosure (smart umbrella with on-device rain prediction) and `examples/output.md` for the corresponding Background, Claims, and retrieval detail produced by the engine. Run the example yourself from the skill root: ```bash cd skills/stilta-patent-drafter bash examples/run.sh ``` ## Important Disclaimer This skill produces a structural scaffold for review purposes only. It is **not legal advice** and does not constitute a filed patent application. Patent claims require review and refinement by a registered patent attorney or agent before filing with any patent office.