Unified Legal AI Agent "LegalBrain Agent" Launches MCP Connector for Claude

  Bengo4.com (Minato-ku, Tokyo; Taichiro Motoe, Representative Director, President and CEO, Lawyer; hereinafter, “the Company”)  is pleased to announce that its unified legal AI agent, "LegalBrain Agent," has been listed in the Connectors Directory (2) for Claude, a generative AI developed by Anthropic PBC (headquartered in the United States;  hereinafter "Anthropic"). This marks the first time in Japan (1) that a service from a domestic legal tech provider has been featured in this directory.

"LegalBrain," the legal domain-specific AI development platform created by Bengo4.com, aims to enhance user convenience by expanding beyond its proprietary services and integrating with external applications via the Model Context Protocol (MCP), an open standard for connecting AI with external services. The recent listing in the Connector Directory represents the first initiative based on this vision. 

*1 *1 [Research method] Web-based research conducted by Bengo4.com. We reviewed publicly available information, including Anthropic's official website and documentation, listing status on the Claude Connector Directory (https://claude.ai/directory/connectors), official announcements and press releases from domestic legaltech companies, and industry news coverage. [Scope of research] Services provided by domestic legaltech companies that have passed Anthropic's review and are listed on the Claude Connector Directory. [Research date] September 16, 2026
*2 A connector is a feature that connects "Claude" to external tools and data sources, enabling it to retrieve data and execute operations. This connector is built using MCP, a standard specification for AI integration.

■ Overview of the Integration
With this integration, in-house legal departments and law firms using Claude can now obtain research results based on Japanese laws and regulations, judicial precedents, and guidelines without leaving their everyday workspace. Users can seamlessly perform tasks ranging from reviewing information against materials at hand to directly compiling research results into reporting documents, all without needing to switch tools.

< How to Use > 
Getting started requires no complex initial configurations or software installations on your computer. The integration is completed simply by selecting the agent from Claude's connector directory and authenticating your account.

1. Search for "LegalBrain Agent" in Claude's connector directory.
2. Open the "LegalBrain Agent" connector page and click "Connect to Claude".
3. Authenticate using your "LegalBrain Agent" account.

Connector Directory URL: https://claude.ai/directory/643b1561-e081-49b5-93db-a67de7400746
*An active "LegalBrain Agent" subscription is required to use this feature.

■ Key Benefits of This Integration
1. Cross-Referencing Internal Documents with Laws, Judicial Precedents, and Guidelines
By integrating the "LegalBrain Agent" into Claude, users can leverage the AI in conjunction with pre-loaded internal documents, such as contract templates, internal regulations, past review memos, and client communication logs. This allows users to reference laws, judicial precedents, and guidelines while seamlessly maintaining the context of their accumulated internal knowledge. 
For instance, a user can simply provide an instruction like: "Based on our internal rules and past review materials, draft a response memo for the business division using our company's terminology and formatting. Please also include the relevant statutory provisions and corresponding sections from the guidelines." The user will then receive a tailored response complete with the supporting legal citations. Complex legal reviews aligned with the specific context of the business or department can now be completed within a single chat thread.

2. Completing Multi-Tool Workflows with a Single Request
The agent can be used simultaneously with other MCP connectors, such as Slack, Notion, and Google Drive. A series of complex tasks—such as "Review the service agreements on the shared drive, identify points of concern based on the latest Fair Transactions Act, and compile the identified issues into a summary table saved as a Word document"—can be executed seamlessly with a single prompt to Claude.

3. A Unified Entry Point for Companies Using Claude
For companies that have deployed Claude organization-wide, legal professionals no longer need to switch between different tools to perform their duties. For organizational plans (Team / Enterprise), administrators can add the connector to their workspace in advance, allowing members to start using the service simply by authenticating with their individual accounts.

■ Use Cases
・ Drafting Litigation Documents (Law Firms)
"Based on the attached file detailing the facts of the case, research judicial precedents where 〇〇 was the point of contention. Then, create a draft of a preliminary brief organizing our arguments."

・ Creating and Updating Internal Training Materials (In-house Legal Departments)
"Create a 15-slide training presentation for employees explaining the basics of the latest Fair Transactions Act. Please reflect the latest legal amendments and cite the relevant statutory provisions on each slide."

・ Adding Reference Lists to Research Results (In-house Legal Departments)
“Organize the specific items that must be disclosed to the data subject when obtaining consent, in relation to the cross-border transfer regulations under the Act on the Protection of Personal Information (APPI). Include a list of the sources referenced, along with their URLs, at the end.”

・ Cross-Tool Workflow Operations (In-house Legal Departments)
"Review the service agreements saved in the shared drive, identify points of concern based on the latest Fair Transactions Act, and compile the identified issues into a summary table in a Word document."

■ Future Outlook
This initiative is part of our ecosystem vision to ensure that "LegalBrain," our legal domain-specific development platform, can be seamlessly accessed from multiple applications. Going forward, we remain committed to bringing the "LegalBrain Agent" right to the environments where legal professionals work daily. Alongside expanding its functionalities, we plan to systematically evaluate integrations with various other AI platforms.

■About Unified Legal AI Agent “LegalBrain Agent”

“LegalBrain Agent” is a unified legal AI agent designed for lawyers and in-house legal professionals, powered by Legal Brain, a proprietary legal AI technology infrastructure developed by Bengo4.com. Its fundamental differentiator from general-purpose AI lies in its design philosophy: it bases its responses solely on highly reliable sources—such as Japanese laws, regulations, precedents, guidelines and specialized legal books, and articles from "BUSINESS LAWYERS"—and ensures that every answer is accompanied by citations and references to the original sources.
Service Website: https://legalbrain.com/