Patent Checker MCP server

Patent Checker

<!-- mcp-name: io.github.xhighhongo41/patent-checker -->

日本語版: README_ja.md

Patent Checker helps you explore published patents that may relate to your own software project, and to write down what you found as a dated, procedure-style report. It is meant to be run more than once on the same project — as an idea, during development, before a release, before each update: a later run searches only what is new, re-checks the patents you are monitoring, and tells you what changed since last time. It is built from two parts:

Services and Google Patents) deterministically: searches, bibliographic records, claims, legal status, patent families, plus offline helpers, and

• an MCP server that fetches public patent data (EPO Open Patent

CLI, Cursor, Gemini CLI, GitHub Copilot CLI, OpenCode, OpenHands, Hermes Agent) through the judgment work: reading your codebase, translating its features into patent vocabulary, screening candidates and writing the report.

• an Agent Skill that drives your AI coding agent (Claude Code, Codex

Patent Checker does not decide whether anything infringes a patent. Its reports contain observations, scope statements and open questions, never a verdict.

Status: stable release (v1.2).

Important notices

Please read these before you install anything. The tool asks you to acknowledge them once, and records that you did.

you knew of specific patents on specific dates. In some jurisdictions, notably the United States, knowledge of a patent can support a claim of willful infringement and increased damages. Dated records of how you responded can also work in your favor. Patent Checker lets you choose where its records live and whether they are tracked in version control: make that choice deliberately.

• What you learn here can be used against you. A report documents that

Coverage varies by country, language, publication stage and data source, and recent applications may be missing entirely. The absence of a document from a report is never evidence that no relevant patent exists.

• Search results are incomplete. No patent search is exhaustive.

qualified patent attorney or agent, and its authors accept no responsibility for decisions made, or not made, on the basis of its output. The final judgment about your project, and any response to it, is yours.

• This is a search aid, not advice. Patent Checker does not replace a

There are two notices. The user notice (the three points above) is shown by the Skill to whoever runs an exploration, and by the installer up front; your agreement is recorded locally and checked before every run. The operator notice is for whoever starts the server: it covers data-source terms, credentials, and what the server stores, and the server refuses to start until it has been acknowledged.

How it works

your agent ──(Skill: judgment)──► patent-checker MCP server ──► EPO OPS
   │                                   │  deterministic fetch,      Google Patents
   │  reads your code, writes           │  normalization, cache
   ▼  the report                        ▼
.patent-checker/reports/…        shared document cache

Shortened. The full README is on GitHub.