Claude for Legal: 12 Plugins, 20+ Connectors (May 2026)

30-second version: On May 12, 2026, Anthropic open-sourced Claude for Legal — twelve practice-area plugins (Apache 2.0 license, on GitHub) and 20+ MCP connectors that wire Claude into the software law firms already use (Docusign, Westlaw via CoCounsel, iManage, NetDocuments, Everlaw, Box, and more). The whole thing runs inside Claude Cowork or Claude Code. Free to install. Free to fork. Designed for both BigLaw and the solo practitioner who doesn’t have a legal-ops team.
Best for: Practicing lawyers, in-house counsel, law students, and solo/small-firm operators who want AI workflows that aren’t toy demos.
You’ll get: The plugin breakdown, the connector breakdown, two install paths, five workflows worth running this week, and an honest read on where this sits versus Microsoft 365 Copilot.
Skip if: You’re looking for a turnkey legal-AI SaaS with one button. This is open source. You install it. Daily AI fundamentals in our free Beginners in AI newsletter.

Anthropic open-sourced its entire legal stack last Monday. Twelve practice-area plugins, more than twenty MCP connectors into the apps law firms already pay for, and a full deployment toolchain for headless agents that run on a schedule. Apache 2.0 license. On GitHub. Forkable.

I’ve seen a lot of “AI for legal” product launches in the last two years. Almost all of them ship as locked-down SaaS at four-figure annual seats. This one ships as a markdown-and-JSON repo you can clone and read end-to-end in an afternoon.

That is the headline, and the headline buries the lede. The lede is that Anthropic has quietly become the platform lawyers actually use day-to-day — legal pros are reportedly the top profession on Claude Cowork — and they just handed the whole reference implementation to the rest of the bar for free.

What Anthropic shipped

The launch lives at github.com/anthropics/claude-for-legal. Apache 2.0. The repository contains twelve practice-area plugins, one external CoCounsel plugin contributed by Thomson Reuters, five managed-agent cookbooks for scheduled work, and a deployment toolchain. Every plugin is a folder of markdown files and a JSON manifest. No build step. No proprietary runtime.

Two install targets. Inside Claude Cowork — the workspace that’s been quietly eating BigLaw mindshare since the February 2026 legal preview — you browse the plugin marketplace, click install, and the plugin shows up in your workspace as a set of slash commands. Inside Claude Code, you run /plugin install commercial-legal@claude-for-legal from the marketplace, restart, and you’re in.

The first thing each plugin does after install is run a cold-start interview. It asks you about your practice — jurisdiction, typical matter types, escalation policy, the people you usually loop in — and writes the answers to a per-plugin CLAUDE.md in your config folder. From then on, every workflow runs against your specific practice context, not against a generic template.

That cold-start step is the part I keep coming back to. Most legal-AI products don’t do this. Most ask you a few questions in onboarding, save them to a database, and then forget half of what you said. The markdown-config approach means your practice profile is a file you can read, edit, and version-control. It’s a small architectural choice that does a lot of work.

The 12 practice-area plugins

Here’s the full list, with what each one actually does — pulled from the repository, not the press release.

• commercial-legal — In-house contracts. Vendor agreement review, NDA triage, amendment tracing, renewal watching, escalation routing. The workhorse plugin for any in-house team.
• corporate-legal — M&A diligence, closing checklists, board consents, entity compliance tracking, material contracts schedule building, data room watching. This is the one for transactional practices.
• employment-legal — Hire and termination review, worker classification, leave tracking, investigation intake, policy drafting, international expansion kickoff.
• privacy-legal — DPA review, DSAR response, PIA generation, regulatory gap analysis, scheduled privacy-policy monitoring.
• product-legal — Product launch review, marketing claims checking, “is this a problem?” triage for product teams. Built for in-house counsel embedded with product orgs.
• regulatory-legal — Regulatory feed monitoring, policy diffs, gap tracking, NPRM comment tracking, policy redrafting. Notably includes a scheduled reg-feed watcher that runs daily.
• ai-governance-legal — AI use-case triage, AI impact assessments, vendor AI review, AI regulatory gap checking. Anthropic shipping a plugin specifically to govern other people’s use of AI is a notable detail.
• ip-legal — Trademark clearance, FTO triage, cease-and-desist drafts, DMCA takedowns, OSS compliance review, IP portfolio tracking, renewal watching. The deepest plugin by workflow count.
• litigation-legal — Claim chart building, demand letters in and out, deposition prep, brief section drafting, privilege log review, legal hold management, matter intake, portfolio status. Fourteen workflows. The most comprehensive plugin in the suite.
• legal-clinic — Built for law school clinics. Client intake, case memos, research roadmaps, deadline tracking, semester handoff, supervisor review queues.
• law-student — Bar prep, Socratic drilling, IRAC grading, outline building, cold-call prep, flashcards. Probably the plugin most people will actually try first.
• legal-builder-hub — The meta plugin. Lets you browse, install, QA, and update community-contributed skills from a registry. This is how the ecosystem is supposed to grow.

Plus one external plugin contributed by Thomson Reuters: cocounsel-legal, which connects Claude to Westlaw Deep Research with full citation. It requires a CoCounsel subscription. Worth it if you have one.

One thing the headline coverage missed: not all twelve plugins are equally mature. The repo flags five — commercial, corporate, litigation, product, and one other — as deployable Managed Agents (Anthropic’s headless agent runtime). The rest are interactive-only for now. That’s a real distinction if you’re trying to run something unattended on a Saturday.

The 20+ MCP connectors

The plugins are useful. The connectors are what makes them load-bearing for actual practice. Without connectors, you’d be pasting documents into a chat box. With connectors, the same workflow runs against your actual document management system.

The full launch list, grouped by category:

• Contract drafting and lifecycle: Definely, Docusign, Ironclad
• Document management: iManage, NetDocuments, Box
• Deal rooms and transactions: Datasite, Box
• E-discovery and review: Consilio, Everlaw, Relativity
• Legal research: Thomson Reuters CoCounsel (Westlaw), Legal Data Hunter, Midpage, Trellis
• Legal AI assistants and tooling: Harvey, Solve Intelligence
• Expert networks: Lawve AI, The L Suite (Lloyd, TopCounsel)
• Public service and pro bono: BoardWise, Courtroom5, Descrybe, Free Law Project

Every plugin also ships with general productivity connectors out of the box — Slack, Google Drive, Box, and Microsoft 365. So a contract review in commercial-legal can pull the document from Box, run the analysis, post the issues list to a Slack channel, and write the redline back to Word with tracked changes. End to end. No copy-paste.

How to install and actually use it

Two paths. Pick the one that matches how you already work.

Path one: Claude Cowork. This is the GUI path. Install Claude Desktop, get Cowork access (paid Claude plan), open the Cowork tab, click Customize, click Browse Plugins, install. The cold-start interview pops up. You answer a dozen questions about your practice. You’re running workflows ten minutes later. This is the path for most practicing lawyers.

Path two: Claude Code. Terminal-native. Clone the repo, add the marketplace, install plugins via command. Same cold-start interview, but from the command line. This is the path for solo operators who run their own automation, or anyone who wants to fork a plugin and tweak it. The whole repo is markdown and JSON, so “tweak it” means “edit a file.” No SDK to learn.

For scheduled background work — reg-feed monitoring, docket watching, contract renewal alerts — you deploy the same plugins as Managed Agents using scripts/deploy-managed-agent.sh. Set your ANTHROPIC_API_KEY, point the script at the cookbook you want, and the agent runs on Anthropic’s infrastructure on the schedule you specified. The repo includes five pre-built cookbooks: diligence grid, docket watcher, launch radar, reg monitor, renewal watcher.

Five workflows worth trying this week

If you’re going to install one of these and try it, here’s where I’d start. These are real commands from the repo, not paraphrases.

1. NDA triage in 90 seconds. /commercial-legal:review on a vendor NDA. The plugin returns an issues list against your standard playbook (which it asked you about in the cold-start interview), flags deviations, and proposes redlines. Useful even if you eventually want a human to re-review.
2. Trademark clearance screen. /ip-legal:clearance on a proposed brand or product name. The plugin pulls USPTO data, runs a likelihood-of-confusion analysis against documented criteria, and writes a memo. Faster than the equivalent manual search by an order of magnitude.
3. DSAR response. /privacy-legal:dsar-response on an incoming data subject access request. The plugin walks you through scope determination, data inventory, redaction, and response drafting. Built for GDPR and CCPA out of the box.
4. Closing checklist driver for an M&A deal. /corporate-legal:closing-checklist. The plugin reads the SPA, builds the closing checklist, assigns owners, and runs a scheduled watcher that flags missed items. If you’ve ever maintained a closing checklist in Excel, this is the upgrade.
5. Bar prep, if you’re a law student. /law-student:socratic-drill on a property law topic. The plugin runs you through Socratic questioning until you can answer cleanly. Less satisfying than yelling at a study group; more reliable as exam prep.

None of these are toy demos. Every one of them is the actual command, in the actual plugin, in the actual repo. The disclaimers at the top of every output are also real: “Every output is a draft for attorney review — not legal advice, not a legal conclusion, not a substitute for a lawyer.” Anthropic has been deliberate about this framing, and any firm rolling these out should be too.

Claude for Legal vs Microsoft 365 Copilot

Both run inside Word. Both can review contracts. Both produce drafts. The differences are less about quality and more about architecture.

• Open source vs closed. Claude for Legal is Apache 2.0 on GitHub. You can read every prompt, fork every workflow, audit every escalation rule. Microsoft 365 Copilot is closed. You get the output; you can’t see the prompt.
• Practice-area depth vs general capability. Microsoft 365 Copilot is a general assistant in your Office apps. Claude for Legal is twelve specialized plugins with workflows specifically designed by people who’ve done that practice area. The depth gap is real.
• Connectors. Microsoft 365 Copilot connects deeply to Microsoft’s own stack. Claude for Legal connects to the legal industry’s stack — iManage, NetDocuments, Westlaw, Everlaw, Relativity. If your firm runs on iManage rather than SharePoint, Claude is closer to your existing workflow.
• Pricing. Microsoft 365 Copilot is a per-seat add-on running roughly $30/user/month on top of your existing Microsoft licenses. Claude for Legal plugins are free to install for any paid Claude customer. The cost is your Claude subscription and your API usage if you run Managed Agents.
• What you don’t get with Claude for Legal: the deep, native Office app integration. Copilot lives inside Word in a way Claude doesn’t. For some practices, that’s decisive.

My read: for most firms, run both. Copilot for the inside-Word edits and email summaries. Claude for Legal for the specialized workflows that actually mirror how lawyers think about a matter. Not a competition. Different tools for different layers.

What this means for solo lawyers and small firms

Until last Monday, the “real” legal AI — Harvey, CoCounsel, Lexis+ AI — was priced for firms with at least an associate billing rate to amortize against. The marginal lawyer at a five-person firm couldn’t justify it. Claude for Legal changes that math.

The full plugin suite costs zero to install on top of an existing Claude subscription. A solo IP practice can install ip-legal and run trademark clearance screens for clients at marginal cost. A small employment practice can install employment-legal and run termination reviews against documented criteria. A new in-house counsel at a fifty-person company can install commercial-legal and triage the vendor contract backlog without hiring a paralegal.

Two practical notes for small operators:

• Start with one plugin. Run the cold-start interview carefully — the quality of every subsequent workflow scales with how well you described your practice. Add plugins over the following weeks.
• The disclaimer is not boilerplate. Every output is a draft. The fact that it’s a really good draft does not change the fact that an attorney still has to sign off. If you’re using these for client work, your malpractice carrier will have opinions about your review process. Have one written down.

For background on Claude for non-legal small business contexts, see our Claude for small business guide. For the broader Claude lineup, Opus vs Sonnet vs Haiku. For the specific tools this expands on, see Claude for lawyers and best AI tools for lawyers.

FAQ

Is Claude for Legal free?

The plugins and connectors are free to install for any paid Claude customer. You need a Claude subscription (Pro, Max, Team, or Enterprise) to use them. Managed Agents cost API usage on top of that. The open-source repository itself is Apache 2.0 and free to fork.

Do I need to be a developer to install these plugins?

No, if you use the Claude Cowork path. The Cowork plugin browser is point-and-click. The cold-start interview asks you questions in plain English. You only need command-line skills if you choose the Claude Code path or want to deploy headless Managed Agents.

What is Claude Cowork?

Claude Cowork is Anthropic’s agentic workspace product. It runs multi-document, multi-step work like contract batch review, product launch clearance, and regulatory memo drafting. Cowork is where the legal plugins are designed to live. Background in our Claude Cowork guide.

How does Claude for Legal compare to Harvey?

Harvey is a closed, enterprise-priced legal AI platform with deep integrations and a large law-firm customer base. Claude for Legal is open source, free to install on a Claude subscription, and uses Harvey itself as one of the available MCP connectors. Harvey is a polished product; Claude for Legal is a platform. Different fits depending on whether your firm wants finished or buildable.

Can I trust AI to review contracts?

For triage and first-pass review, yes — with an attorney review on the output. The Anthropic disclaimer is explicit: every output is a draft, not legal advice. The right use case is removing the work that doesn’t require legal judgment so you can spend your time on the work that does.

Will Anthropic add more plugins?

The legal-builder-hub plugin exists specifically to enable community-contributed skills with a QA process. Anthropic also referenced an upcoming Mythos-tier model for power users in its blog posts. The shape of the launch suggests they expect the plugin set to grow, with both first-party and community contributions.

The bottom line

Anthropic just gave away the most comprehensive AI-for-legal stack any major lab has shipped, and put it on GitHub with an Apache 2.0 license. The bar to entry for serious AI in a law practice just dropped to the cost of a Claude subscription.

What I’d watch over the next ninety days: how many community plugins show up in the legal-builder-hub registry, how Microsoft and Google respond, and how quickly Harvey and CoCounsel reposition. The space is going to move fast. The plugins were the easy part to ship; the hard part is the trust and adoption pattern that follows.

For daily reads on what frontier AI is actually doing — not the headlines, the substance — subscribe to the free Beginners in AI newsletter.

Sources

• Anthropic, Claude for the legal industry, May 12, 2026 — official launch announcement and partner list.
• Anthropic, claude-for-legal repository on GitHub, Apache 2.0 — the source of every plugin name, workflow command, and connector cited in this post.
• Bob Ambrogi, LawSites: Anthropic Goes All-In on Legal, May 12, 2026 — coverage of the launch and partner ecosystem context.
• Artificial Lawyer: Claude For Legal Launches, May 12, 2026 — industry analysis of the launch and competitive positioning.
• PYMNTS: Anthropic Scales Legal AI as Lawyers Become Cowork’s Top Users — Cowork adoption data for the legal profession.
• TechCrunch: The AI legal services industry is heating up — competitive context against Harvey, Lexis+ AI, and CoCounsel.

Related news

• Glossary: What Are Managed Agents?
• Microsoft is canceling Claude Code licenses for thousands of engineers — news, May 14–15 2026.
• May 2026 AI updates: one-page cheat sheet — the full month at a glance.