CoCounsel Legal
Run cited Westlaw and Practical Law legal research from an AI agent. Anthropic lists 4 deep-research tools; Thomson Reuters' own help centre documents a single Ask CoCounsel dispatcher instead. OAuth sign-in, identity-only scopes, licence terms that restrict what you may do with what comes back.
Verified connector
Listed by Anthropic as a partner connector in its Connectors Directory.
Connection checked by Agentman on .
Anthropic states this reflects the level of review a connector received, not a security audit.
Connect CoCounsel Legal via MCP
https://legal-mcp.thomsonreuters.com/mcpWorks in any MCP-compatible client. In Agentman Studio it is one click — no config file to edit.
CoCounsel Legal Tools & Capabilities (4)
Tool names from Anthropic's directory listing. This server requires sign-in, so we could not read tool descriptions or parameter schemas.
Limits
- Thomson Reuters publishes two contradictory tool listings. The connector guide documents four deep-research tools; the help centre documents a single
Ask CoCounseldispatcher plus session and file helpers. Both were live on 2026-08-22. We could not determine which your entitlement returns without authenticating, and we did not. - The tool surface is not bounded by any published list. Thomson Reuters states new CoCounsel skills become reachable through the same tool automatically, without reconnecting. Any tool census of this connector — Anthropic's, ours, or the vendor's — is a snapshot, not a ceiling.
- A four-tool listing sits in front of a 26-skill catalogue. Thomson Reuters' own sitemap documents 26 CoCounsel skills, of which Westlaw Deep Research is one. If your account routes through the dispatcher, the tool count tells you almost nothing about what the connector can be asked to do, and no client-side allowlist can constrain the routing.
- No application scopes exist. The RFC 9728 descriptor advertises
openid,userandemail, and the Auth0 authorization server advertises fourteen scopes that are all OpenID identity claims. Nothing at the OAuth grant separates reading research from uploading a client file. The descriptor'suserscope is not among the fourteen the authorization server claims to support. - This is a pilot and Thomson Reuters says it may withdraw it without notice. Both Anthropic's directory description and the help centre carry that statement, adding that it may be modified or suspended "in whole or in part".
- Retrieved content stays licensed, and the licence limits what you may build. Thomson Reuters prohibits using connector content as a knowledge base, index, embeddings store or RAG source, and prohibits routing it to another legal, tax, audit or compliance AI tool. It names "always allow" and "auto-approve" settings as a configuration you are responsible for avoiding.
- The defined term "Professional AI Tool" is not in the public terms. It appears in Anthropic's directory description and Thomson Reuters' help centre, but not in the public General Terms (Version 5, Q2-25) or GenAI Terms. We could not verify its definition.
- Output is AI-generated and Thomson Reuters tells you to check it. Its Westlaw Deep Research help states responses "are AI-generated and may contain errors" and "should always be validated for accuracy and relevance". Reports carry Westlaw citation links precisely so each authority can be opened at source.
- US law only, three jurisdictions at a time. Coverage is US federal and state law. Non-US questions are directed to country-specific Westlaw products. The next-generation product itself is available in the United States only, with other countries expected later in 2026.
- We could not read tool schemas or safety annotations. The endpoint returned 401 to an anonymous request, so no parameter-level detail or annotation state is published here.
- No rate limits are published. Neither Thomson Reuters page states a request quota, concurrency cap or throttle for the connector. The General Terms reserve a right to apply "metering or other usage restrictions", which is a reservation rather than a documented limit.
- The two pages disagree on run duration. Expanded research is "20 minutes or more" in the connector guide and "10 minutes or more" in the help centre. Plan against the longer figure.
- The connector is not a substitute for Westlaw search. Thomson Reuters directs exhaustive result lists, specific document retrieval, jurisdictional surveys, litigation analytics and causes-of-action work to Westlaw's own tools rather than the connector.
Frequently asked questions
Four on one Thomson Reuters page and five on another, and the two disagree about what they do. The connector guide names four deep-research tools matching Anthropic's listing. The help centre says the connector “deliberately exposes a single tool”, Ask CoCounsel, plus helpers that begin a session, upload and list files, and retrieve deliverables. Both pages were live on 2026-08-22.
On the newer surface, yes — considerably more. Thomson Reuters' help centre states CoCounsel draws on “any of its capabilities”, and its sitemap documents 26 named CoCounsel skills including review, summarization, timelines and deposition preparation. Westlaw Deep Research is one of the 26. The connector guide describes the opposite, telling readers to use CoCounsel directly for drafting or summarizing.
None that narrow anything. The RFC 9728 resource descriptor advertised openid, user and email on 2026-08-22, and the Auth0 tenant behind it advertises fourteen scopes that are all OpenID identity claims. No scope separates reading a research report from uploading a client document. The scope named user is not among the fourteen the authorization server says it supports.
Not as a knowledge base or an index. Thomson Reuters' General Terms bar you from indexing or storing the Property, and from using it to “develop, train, adapt, fine-tune, modify or improve” any AI software. The GenAI Terms repeat the training bar. Building embeddings or a retrieval corpus from retrieved reports is prohibited on the face of those clauses.
On the newer surface it can, and only when you ask. The help centre documents an Upload File tool that opens a picker and attaches your document to the CoCounsel session, where it stays for the rest of that chat. Claude's own paperclip button does not reach CoCounsel. Nothing leaves your machine without that explicit tool call.
A CoCounsel Legal package subscription on an active Thomson Reuters account. Anthropic's directory adds that you must have switched to the next generation of CoCounsel. Thomson Reuters announced general availability of that release on 2026-08-20, in the United States only, with Canada, the United Kingdom and Australia expected later in the year.
Several minutes for a concise report, and the two Thomson Reuters pages disagree about expanded runs. The connector guide says an expanded report “often takes 20 minutes or more”; the help centre says 10 minutes or more. Both describe document review and shorter drafting as a few minutes. Research is asynchronous, so the agent polls for status.
No. The connector guide scopes research to US federal and state law and targets up to three US jurisdictions per run. For non-US law it directs you to the country-specific version of Westlaw for the United Kingdom, Canada, or Westlaw International. The connector itself has no equivalent jurisdiction, and no tool parameter reaches that content.
Sources
- Thomson Reuters CoCounsel Legal MCP connector guide (retrieved 2026-08-22). The
documentationURL in Anthropic's directory. The host serves norobots.txt, nollms.txtand 404s at its root. · retrieved 2026-08-22 - Thomson Reuters Help & Support, "CoCounsel Legal MCP connector" (retrieved 2026-08-22,
last-modified2026-08-22). Found viahttps://www.thomsonreuters.com/en-us/help/sitemap.xml, which Thomson Reuters names in its ownrobots.txt; the path matches noDisallowrule and the file carries noContent-Signalline. · retrieved 2026-08-22 - Thomson Reuters press release, "Thomson Reuters Launches Next Generation of CoCounsel Legal" (retrieved 2026-08-22), dated 2026-08-20 · retrieved 2026-08-22
- Thomson Reuters General Terms and Conditions (US), Version 5, Q2-25 (retrieved 2026-08-22), reached from the
tr.com/us-general-terms-and-conditionslink on the help page · retrieved 2026-08-22 - Thomson Reuters GenAI Terms (retrieved 2026-08-22) · retrieved 2026-08-22
- Thomson Reuters privacy statement (retrieved 2026-08-22) · retrieved 2026-08-22
- Thomson Reuters help, "Westlaw Deep Research" (retrieved 2026-08-22) · retrieved 2026-08-22
- Thomson Reuters help, CoCounsel skills, prompts and workflows (retrieved 2026-08-22). The count of 26 skills is our enumeration of that page's children in Thomson Reuters' own help sitemap, not a figure the vendor states. · retrieved 2026-08-22
- Live OAuth posture check: anonymous
initializereturned HTTP 401 with awww-authenticate: Bearerchallenge naming its resource metadata; RFC 9728 descriptor athttps://legal-mcp.thomsonreuters.com/.well-known/oauth-protected-resource/mcpreturned 200; a control probe at a nonexistent sibling path returned 404, so the 200 is genuine rather than a catch-all; authorization server metadata read athttps://auth.thomsonreuters.com/.well-known/oauth-authorization-server(all 2026-08-22) · retrieved 2026-08-22 - Anthropic Connectors Directory entry — , read from our directory snapshot dated 2026-08-16, which carries Thomson Reuters' connector Usage Terms in full · retrieved 2026-08-16
- Thomson Reuters CoCounsel support — <mailto:cocounselsupport@tr.com>
Use in Agentman
Connect once and your agents call these tools on their own — on a schedule, in a workflow, with nobody at the keyboard.
Open in Agentman StudioServer Info
- Category
- Productivity
- Developer
- CoCounsel Legal
- Tools
- 4
- Domain
- legal-mcp.thomsonreuters.com
Using Claude Desktop or another MCP client? Setup docs — the connection URL above works anywhere.