Thomson Reuters (NASDAQ: TRI) announced a new Model Context Protocol integration with Anthropic that connects Claude directly to CoCounsel Legal. The integration allows legal professionals to move between general-purpose AI and citation-grounded legal work from either working environment.

The new MCP integration enables users to seamlessly transition work between Claude and CoCounsel Legal's workflows. CoCounsel Legal processes 1.9 billion Westlaw and Practical Law documents, 1.4 billion KeyCite validity signals, and uses a patent-pending citation ledger for source traceability.

"Thomson Reuters is building CoCounsel Legal to be the fiduciary-grade system at the center of how legal work gets done, connected to the tools lawyers use and built to the standard their work demands," said David Wong, Chief Product Officer at Thomson Reuters.

The next generation of CoCounsel Legal is built on Anthropic's Claude Agent SDK and represents a shift to a system that plans, selects tools, retrieves content, and adapts during workflows. Legal professionals will be able to describe matters in plain language and have CoCounsel Legal pursue inquiries, draft with citations, and include validated references.

"Our work with Thomson Reuters reflects a deeper strategic partnership to deliver AI that can operate in high-stakes professional environments," said Scott White, Head of Product, Enterprise at Anthropic.

Thomson Reuters states that customer data is not used to train third-party models and is not shared beyond a customer's environment. The company reports that one million professionals across 107 countries and territories use CoCounsel, Thomson Reuters' AI technology.

Thomson Reuters expects general availability for the next generation of CoCounsel Legal this summer, according to the company's press release statement.