Claude Cowork Legal Plugins

Anthropic publishes an open-source Legal productivity plugin for Cowork (and Claude Code): playbook-backed contract review, NDA triage, vendor checks, briefings, and templated responses—installable from the Knowledge Work marketplace and documented at claude.com/plugins/legal.

This page summarizes what official Anthropic materials describe. It is not legal advice. AI-generated contract analysis, NDA triage, briefings, and templated responses must be reviewed by a licensed attorney before any legal decision, filing, or client-facing use.

What the Legal plugin is for

According to the Legal plugin page and the legal folder README in anthropics/knowledge-work-plugins:

• Built for in-house commercial counsel, product counsel, privacy/compliance, and litigation support teams.
• Automates contract review, NDA triage, compliance workflows, legal briefings, and templated responses—configurable to your organization’s playbook and risk tolerances.
• Ships as an Anthropic Verified plugin in the Knowledge Work collection (also listed among Anthropic-built role plugins in Claude Help).

Treat published personas and workflows as intent maps, not a guarantee that every connector or jurisdiction default matches your workspace.

Slash commands / workflows (official)

Documented only where named on the official plugin page or legal plugin README:

Command	What official materials describe
/review-contract	Clause-by-clause review against your configured negotiation playbook; GREEN/YELLOW/RED flags and redline suggestions. Accepts file upload, URL, or pasted text.
/triage-nda	Rapid NDA pre-screening; categorizes for standard approval, counsel review, or full review (GREEN/YELLOW/RED).
/vendor-check	Check status of existing agreements with a vendor across connected systems (e.g. NDAs, MSAs, DPAs, expirations).
/brief	Contextual briefings: daily, topic [query], or incident.
/respond	Templated responses for common inquiries (examples include data subject request, discovery hold, vendor question, NDA request, plus custom categories you define).

Skills bundled in the same plugin (invoked when relevant, or via / / +) include contract-review, nda-triage, compliance, canned-responses, legal-risk-assessment, and meeting-briefing—per the plugin README.

Install via Cowork / marketplace (official pattern)

From Use plugins in Claude, the Knowledge Work Plugins README, and the legal plugin install notes:

1. Open Claude Desktop → Cowork (or chat on web / Desktop Chat tab, depending on plan surface).
2. Open Customize → Plugins → Browse plugins.
3. Install Legal from Anthropic’s Knowledge Work marketplace (Help notes Knowledge Work is added by default), or open the listing at claude.com/plugins/legal.
4. Optionally add Anthropic-curated marketplaces (Help lists Legal alongside Knowledge Work, Life Sciences, and Financial Services) via Customize → Plugins → Personal + → Add marketplace.
5. For Claude Code, the Knowledge Work README documents: add marketplace anthropics/knowledge-work-plugins, then install the plugin (legal plugin README also shows claude plugins add knowledge-work-plugins/legal—confirm the current CLI wording in that repo).
6. Skills activate when relevant, or invoke them with / / the + control during a session.

Enterprise / Team owners may distribute organization-managed plugins; some installs may be auto-installed or required—see the same Help article.

Playbook / local settings customization

Official legal plugin docs center customization on a local playbook file:

• Create legal.local.md where Claude can find it.
• Cowork: save it in a folder you have shared with Cowork (folder picker); the plugin finds it automatically.
• Claude Code: save under the project’s .claude/ directory (README also references .claude/legal.local.md for jurisdiction customization).

Encode standard positions, acceptable ranges, escalation triggers, NDA defaults, and response templates. Default playbook examples in the plugin reflect U.S. positions/jurisdictions (Delaware, New York, California). If you operate under other systems, customize the playbook before relying on the analysis.

In Cowork you can also open an installed plugin and use Customize to start a Cowork task that adjusts skills and connectors (per Claude Help).

MCP connectors (official + entitlement caveats)

The legal plugin README and CONNECTORS.md describe category-based MCP wiring. Pre-configured / example servers named for this plugin include Slack, Box, Egnyte, Atlassian (Jira/Confluence), and Microsoft 365. Categories also list options such as Teams, Google Calendar/Drive/Gmail, DocuSign, Ironclad/Agiloft (CLM), Salesforce/HubSpot (CRM), and others as alternatives—not a guarantee every option is enabled in your workspace.

Operational caveats (same honesty bar as finance plugins):

• Access to partner CLM, DMS, e-signature, or research systems may require a separate subscription, admin enablement, or API entitlement.
• In Cowork, connectors reach external services through Anthropic’s cloud (per Claude Help)—not your local LAN unless a custom connector is publicly reachable.
• The plugin is documented to gracefully degrade when tools are unavailable; do not assume Box, Egnyte, Jira, or M365 are connected until you authorize them.

Anthropic’s Claude for the legal industry post (May 12, 2026) and Legal solutions page describe a broader legal connector and practice-area plugin ecosystem (Legal Marketplace / anthropics/claude-for-legal). Treat that suite as related product surface—confirm listings in product settings before relying on any named partner connector.

Not legal advice / attorney review

The legal plugin README states plainly: the plugin does not provide legal advice; always verify conclusions with qualified legal professionals; AI-generated analysis should be reviewed by licensed attorneys before legal decisions. The plugin page likewise: all outputs should be reviewed by licensed attorneys.

On CoworkHow we add the operational version:

• Treat redlines, triage labels, briefings, and templated responses as drafts.
• Keep filing, sending to counterparties, privilege calls, and client advice under human attorney approval.
• Customize jurisdiction and playbook before trusting GREEN/YELLOW/RED classifications outside the defaults.
• Scope connectors and shared folders narrowly; see the security model.

Related Guides

• Finance plugins — Official FSI marketplace set and entitlements
• Cowork plugins — How plugins package skills and connectors
• Skills and connectors — Building blocks behind plugins
• Connectors hub — Connectors vs MCP vs plugins (no fake app catalog)
• Managed Agents — Platform API agents vs Desktop plugins
• Security model — Sandbox and access boundaries

Related Features

• Scheduled Tasks — Recurring regulatory or intake-style runs when product supports them
• Computer Use — Desktop app control when a preview is enabled
• Dispatch — Send desktop-backed work from your phone