Legal Node Releases 'Contract Check,' a Free AI Agent Skill Specialized for Japanese Contract Review

Legal Node has released 'Contract Check,' an AI agent skill that reproduces procedures used by Legal Node Law Office for contract review. Specialized for Japanese contracts, it includes over 60 review points and 180 standard clause examples. It allows users to complete tasks from case organization to generating revised versions in a local or on-premise server environment, without uploading data to external SaaS.

Contract Check is a skill for Claude Code/Codex (an extension that integrates business procedures into AI agents) that supports NDAs, service agreements, system development contracts, and sales contracts. By incorporating over 60 review points and 180 standard clause examples, it provides reproducible support for contract review tasks, including case organization, position verification, extraction of risky or disadvantageous clauses, drafting corrections, and creating revised Word documents with change tracking.

Background of the Release
As symbolized by the release of 'Claude for Legal,' the integration of AI agents into legal practice is accelerating.

However, Japanese contract review practices have specific requirements—such as judgments based on Japanese law and the nuances of Japanese contract writing styles—that international tools struggle to meet. We believed it was necessary to translate these unique Japanese legal procedures into a reproducible format for AI agents.

Additionally, as the potential for AI usage expands with the advent of advanced AI agents, security concerns—specifically regarding where corporate confidential information and contract data are handled—have become increasingly important.

For legal departments to utilize AI, they need an AI agent environment capable of executing tasks—from case organization to contract checking and generating deliverables—starting from an on-premise server or local environment, rather than relying on uploading to external SaaS.

'Contract Check' was released as a usable excerpt of this Japanese legal-specific AI agent environment, born from these concerns.

Key Features
- Fully contained locally/on-premise (no need to upload data to external SaaS)
- Specialized for Japanese legal practices and Japanese contract review
- Supports NDAs, service agreements, system development contracts, and sales contracts
- Includes over 60 review points
- Includes over 180 standard clause examples
- Usable as a Claude Code/Codex skill
- Supports drafting lists of points for improvement and revised Word documents with change tracking
- Supports drafting comments for explanation to the other party
- Mechanically verifies the existence of change tracking and comments

Legal AI Agent Environment Implementation Support (FDE)
'Contract Check' released today is a portion of the AI agent environment actually used by Legal Node Law Office, made available to the public.

Legal Node Law Office builds and operates AI agent environments tailored to legal workflows, including review procedures for each contract type, legal due diligence, preparation of QA/document request lists, point organization, and the creation of Word/Excel deliverables.