Claude CoCounsel Legal connectorWhat Claude can do in your CoCounsel Legal account.
The Claude CoCounsel Legal connector exposes 5 tools: 2 for reading, 1 for writing, 2 undocumented. Claude passes legal work to Thomson Reuters' agent and brings its answers back. Below: what moves where, what the licence forbids, and what the pilot status means.
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What changes for a legal team that already pays for CoCounsel
The work itself does not move to Claude. Thomson Reuters describes the connector as a handoff: Claude passes your legal request to CoCounsel, which reasons with Westlaw and Practical Law content, then streams the result back into the same conversation where you keep asking follow-ups.
Get documents to the right place. You want three supplier agreements reviewed: upload_file opens a picker in the chat and attaches them to your CoCounsel session, where they stay available for the rest of that conversation.
Keep track of what CoCounsel holds. Before a second question, list_cocounsel_files shows which files the session already has, so nothing gets sent twice.
Collect the finished work. Once a memo or a comparison is ready, get_cocounsel_output retrieves the deliverable CoCounsel produced.
Thomson Reuters lists research across up to 3 U.S. jurisdictions, drafting, chronologies and document comparison among the jobs it runs. Two tools, ask_cocounsel and start_cocounsel_chat, sit at the centre of that flow, yet no source says whether they read or alter anything, so this page leaves them undocumented. And nothing runs unattended: a new filing or a deadline triggers nothing. Background jobs belong to automation tools, gathered on the Integrations hub.
Five words before you plug it in
The vocabulary you will meet when you set this up.
- Connector
- The link you set up once between Claude and an account you already hold, so Claude can work with it while it answers you.
- Tool
- One named action a connector gives Claude. Claude decides which ones to call; the directory sheet names each of them.
- Authorization
- The service's own sign-in screen, here Thomson Reuters', where you grant Claude the access it will use. Given once per person, revocable later.
- Approval
- The confirmation Claude waits for in the chat before it goes through with an action that changes an account in your place.
- MCP
- The shared standard connectors rely on: it is what lets an assistant like Claude hold a conversation with an outside service.
Plug CoCounsel Legal into Claude in three steps
- 01
Find it in Claude's settings
Open Customize, then Connectors, and look for CoCounsel Legal. On a Team or Enterprise workspace, an Owner or Primary Owner has to enable the connector before members can sign in individually.
- 02
Start the connection
Click Connect on its row, then sign in to your Thomson Reuters account in the window it opens. If the link stops working later, use Disconnect and connect again.
- 03
Check the authorization screen
Read the Thomson Reuters screen before you accept. It belongs to the service, not to Claude, and it decides what the access covers. You can withdraw that access later from the service side as well.
The 5 tools, sorted by what they do
CoCounsel Legal gives Claude 5 tools: 2 that read your account, 1 that change something in it, and 2 no official source describes.
Three groups: what Claude reads, what it sends, and what no official source describes. Names stay in English, as Claude displays them.
- 2 read
- 1 write
- 2 not documented
What Claude reads (2)
2 toolsTwo tools that look at what your CoCounsel session already holds.
list_cocounsel_files
Shows the files already attached to your CoCounsel session, so Claude knows what CoCounsel can work from before it hands over the next request.
get_cocounsel_output
Brings back what CoCounsel generated, a memo, a comparison table or a chronology, so you read it in the conversation rather than in a separate app.
What Claude sends (1)
1 toolOne tool that puts a file into your CoCounsel session. No source details a confirmation for it; the general rule below applies.
upload_file
Approval: see the ruleOpens a file picker inside the chat and attaches your document to the current CoCounsel session. The file then stays available to CoCounsel until that conversation ends.
Not documented (2)
2 toolsThomson Reuters mentions these two, but no official source says whether they only read or also alter anything. This page does not guess.
start_cocounsel_chat
Thomson Reuters groups this tool with the supporting ones that open a CoCounsel session, but no official source documents whether it only reads or also alters anything in your account.
For what Claude asks before acting, see the general rule in the approvals section.
ask_cocounsel
According to Thomson Reuters, every legal request goes through this single tool rather than through separate ones for research, drafting or review. Still, no official source documents whether it reads only or also alters account data.
The approvals section below sets out the default rule that applies here.
What Claude asks before it acts
By default, Claude stops and asks for your go-ahead before any action it takes on an account in your place. The connector's own terms add a twist: don't lean on an automatic yes.
On a Team or Enterprise workspace, owners decide whether members may let some actions through without being asked each time, and they can limit what a connector may do for the whole organisation, for instance keeping reading and closing writing. That setting applies to everyone. Claude works with the rights of the person connected, nothing beyond. The official read-only versus write-delete label per tool exists only in the settings of a connected account.
Which plans can use it
Not one of the 819 sheets in the official directory shows availability by plan. That answer, connector by connector, is published nowhere: a real gap in the catalogue.
The general rule is public. Remote connectors are open to all users on Claude, Cowork, Claude Desktop and mobile; desktop extensions install on Claude Desktop. On Team and Enterprise, an Owner or Primary Owner enables a connector for the organisation before members can connect. For the live status of this one, open the CoCounsel Legal sheet in the official directory from your own account.
Where this connector stops
A connector is not an automation. Claude calls these tools while it answers you, and nothing starts on its own when a matter opens or a document lands.
Only Thomson Reuters documents this connector; neither Claude's help centre nor Anthropic's developer docs cover it. The tool list is an observed floor, not a promise, and the directory's verification badge is not a security audit: Anthropic says on every sheet that it does not control the tools a publisher exposes. Thomson Reuters runs it as a pilot it can change, suspend or withdraw without notice. For another sheet read the same way, see the Claude adobe-workfront connector.
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