Thomson Reuters Connects CoCounsel Legal with Anthropic’s Claude

Thomson Reuters announced in a press release a new Model Context Protocol integration with Anthropic that connects Claude directly to CoCounsel Legal. The integration allows legal professionals to move seamlessly between general purpose AI in Claude by Anthropic and citation-grounded legal workflows in CoCounsel.

The connection enables users to conduct research, draft documents, and validate references while maintaining professional standards for accuracy and accountability. CoCounsel Legal operates on a foundation of Westlaw and Practical Law content, along with KeyCite validity signals and a citation ledger that makes every source traceable.

According to the announcement, the next generation of CoCounsel Legal has been rebuilt using Anthropic's Claude Agent SDK. The system can plan, select tools, retrieve authoritative content, and adapt mid-workflow. Lawyers will be able to describe a matter in plain language and have CoCounsel Legal generate drafts with citations and validated references.

Thomson Reuters said the integration marks the first step in connecting general AI systems to professional legal environments. The company expects general availability for the new version of CoCounsel Legal later this summer.