Replace Harvey AI: Build Your Own Legal AI Stack on Claude + MCP (2026)

Short answer: for statute-grounded research, contract and NDA review, and long-document analysis, a Claude subscription plus a legal MCP server and Anthropic's Legal plugins covers much of the day-to-day workflow a legal AI platform sells. It does not cover everything. Harvey publishes enterprise controls, document vaults, audit logs and an API that a do-it-yourself stack does not replicate, and you become the support desk. This post lays out what each side publishes, how to wire the stack, and when buying Harvey is the better call. The two can also work together, because Anthropic lists Harvey as one of the connectors available in Claude.

Reviewed and corrected on 12 October 2026. This is general information, not legal advice. Harvey and Anthropic facts below come from their own pages as read on that date.

Harvey does not publish a price list, so this post does not quote seat prices for it. If you are comparing cost, ask Harvey for a quote and compare it against the published Claude plan prices below. Our Harvey, Legora and CoCounsel pricing roundup collects the third-party reports and says where they come from.

TL;DR

• On May 12, 2026, Anthropic launched Claude for the legal industry with 20+ new MCP connectors and 12 practice-area plugins (Anthropic, May 12, 2026). Harvey is one of the connectors: Anthropic says it "brings Harvey's legal intelligence into Claude."
• Claude's Max plan starts at $100 a month for 5x the usage of Pro, with a 20x option above that (Claude pricing page). Plan prices change, so read that page before you budget.
• A legal MCP server grounds Claude's answers in primary-law text. The one we build covers statutes, regulations and court rules by citation. For opinions, add a case-law connector.
• What you give up: Harvey's enterprise controls (its security page lists SAML SSO, audit logs, IP allow-listing and data lifecycle management), its Vault and review tables, and a vendor to call when something breaks.
• A mixed setup is possible. Harvey documents its own MCP server, so a firm that already pays for Harvey can reach it from Claude.

Part of our MCP and developer guide series. For the build-or-buy decision framed for in-house teams, see Build vs Buy: Legal AI for In-House Teams. For managed options, see Top 10 Harvey alternatives for in-house counsel and Do Harvey and Legora have APIs?.

The config details for each client live in How to Use Claude for US Legal Research (with MCP). Developers who work in an editor can start with Legal Research from Inside Cursor and Claude Code.

What Harvey publishes about itself

Harvey is a real product with public documentation, so it is worth reading what it says rather than what comparison sites say.

• A developer API. Harvey has a documentation site at developers.harvey.ai. Its guides cover an Assistant, Vault, review tables, history exports, audit logs, client matters and a Harvey MCP server. The introduction tells readers to check their order form or support@harvey.ai to confirm which features their organization is licensed for, so access depends on your contract.
• Security controls. Harvey's security page says it "undergoes annual SOC 2 Type II and ISO 27001 audits," lists "SAML SSO, audit logs, IP allow-listing, and data lifecycle management," and states: "We don't use inputs, outputs, or uploaded documents to train underlying models."
• No public price list. We found no seat price on Harvey's own pages. Treat any number you see elsewhere as a third-party report.

Those are the layers a platform adds on top of a model: document storage and matter organization, enterprise access controls, audit trails, and a vendor relationship. A self-assembled stack has to bring its own for each.

What the Claude side offers

Anthropic's announcement groups the pieces into connectors (MCP servers that bring live data and systems into Claude), practice-area plugins (packaged skills for recurring tasks) and the Microsoft Office integrations.

• Connectors. The May 12, 2026 launch lists 20+ new ones, including document management (iManage, NetDocuments), contract tools (Definely, Docusign, Ironclad), e-discovery (Consilio, Everlaw, Relativity), legal research (Legal Data Hunter, Midpage, Trellis), Thomson Reuters's CoCounsel Legal, Harvey and Free Law Project. The ABA Journal summarized the launch the same week (ABA Journal, May 14, 2026).
• Plugins. Twelve practice-area plugins, including Commercial, Corporate, Employment, Privacy, IP and Litigation. Anthropic says each can be installed in Cowork or Claude Code, and that enterprise admins can enable them in workspace settings. A first Legal plugin shipped earlier in 2026, per Anthropic.
• Long documents. Anthropic's models page lists a 1M-token context window on the API for three of its four current models (Haiku 4.5 is listed at 200K). Limits inside a particular Claude app plan can differ, so test your own documents.
• Plans. Max starts at $100 a month, and the pricing page notes that usage limits apply and prices are subject to change (Claude pricing page).

The stack

A workable assembly for a small team looks like this. The tools are interchangeable. The pattern is what matters.

If you want the cost side, add up the plan, the MCP provider's published per-call prices and the tools you already pay for, then compare that total against a written Harvey quote. A comparison built on one side's published prices and the other side's rumor will mislead you.

What this stack does well

Statute-grounded research in the chat. Connect the MCP server and Claude can search statutes and regulations, resolve a citation such as Fla. Stat. § 542.335 to its exact section, and return the text with the official source link. Ask what a Florida restrictive covenant statute requires and Claude calls the search and section tools, then summarizes from the returned text. Our Claude MCP guide shows the exact config and a real query.

Contract review and drafting. Paste a draft into Claude, run the Legal plugin for your practice area, and ask for a clause-by-clause review. With the MCP on, Claude can check statute references in the draft against the actual section text instead of from memory.

Document analysis. With a large context window, you can ask questions across a long deposition or a lengthy agreement in one session. For matter-level work over many documents, Claude Projects keeps a persistent workspace, which Anthropic's announcement describes for matter teams.

Multi-step work. Tell Claude to find the controlling rule, then draft an outline from it. It can chain the tool calls. For opinion-level steps, such as how courts have read a phrase, it needs a case-law connector or a person.

What this stack does less well

Enterprise controls and records. Harvey lists SSO, audit logs and IP allow-listing on its security page. Plans vary on the Claude side, and the Max plan's own feature table lists single sign-on as not included. If your clients or insurers require them, price an enterprise plan or a platform.

Prebuilt workflows for big matters. Harvey documents Vault and review tables for working across many files. A DIY stack can approximate that with plugins and scripts, which takes engineering time.

Document management depth. Anthropic lists iManage and NetDocuments connectors, which narrows this gap. How deep any integration goes in your environment is something to test, not assume.

Support and contractual commitments. A platform comes with an account team and a written agreement. On a self-assembled stack you handle support yourself, and each vendor's terms apply separately.

The setup

This is the short path from nothing to Claude plus a legal MCP. The full steps, with the hosted-server option and the Claude Code, Cursor and VS Code variants, are in our MCP guide.

Step 1: Get a Claude plan. Sign up at claude.ai and pick the plan that fits your usage. Max starts at $100 a month.

Step 2: Install Claude Desktop. The local MCP configuration lives in the desktop client.

Step 3: Get an API key. Generate a key from your Vaquill AI API dashboard. It starts with vq_key_. Each call spends credits, and the free pricing endpoint lists what each costs.

Step 4: Add the server to Claude Desktop. Edit ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or the Windows equivalent:

{
  "mcpServers": {
    "vaquill": {
      "command": "uvx",
      "args": ["vaquill-mcp"],
      "env": {
        "VAQUILL_API_KEY": "vq_key_your_key_here"
      }
    }
  }
}

Save, fully quit Claude Desktop, and reopen it.

Step 5: Add a Legal plugin. Anthropic says its plugins can be installed in Cowork or Claude Code, and links them from its Legal Marketplace. Follow the steps on Anthropic's announcement.

Step 6: Test it. Open a new chat and ask:

What does Fla. Stat. § 542.335 require for a restrictive covenant to be enforceable? Quote the section and give me the official source link.

Claude should call the search and section tools and return the statute text with its source link. If it answers without calling a tool, tell it to use the tool.

When Harvey, or another platform, is the better buy

Three situations point toward a platform.

You need the enterprise package. Procurement-approved vendors, SSO, audit logs and a written support commitment are what platforms sell. Harvey's security page lists SOC 2 Type II and ISO 27001 audits. Ask any vendor for the current report under NDA.

Your work is high-volume and workflow-heavy. If you review thousands of contracts per matter, the review tables and vault tooling a platform documents may save more than a chat setup does. Pilot both on one real batch and time the manual steps.

Your documents live in a system you cannot leave. If your firm runs on iManage or NetDocuments and the Claude connector does not cover your workflow, a platform's native integration may matter more than price.

A pilot is the honest test. Pick the workflow you run most often, run it on both for a week, and compare the output and the time spent on manual steps.

FAQ

Can you replace Harvey AI with Claude? For some work, yes. A Claude plan, a legal MCP server and Anthropic's Legal plugins cover statute-grounded research, contract and NDA review, and document analysis. They do not supply the enterprise controls, vault tooling or vendor support that Harvey documents, so the answer depends on what your firm needs from a platform.

How much does Harvey cost? Harvey does not publish a price on its own pages. Ask Harvey for a quote. Third-party sites report figures, and our pricing roundup lists them with sources, but only Harvey can tell you what your firm would pay.

Does Harvey have an API? Yes. Harvey has a public documentation site at developers.harvey.ai covering an Assistant, Vault, review tables, history exports, audit logs, client matters and a Harvey MCP server. Which of those your organization can use depends on its order form. See our guide to whether Harvey and Legora have APIs.

Can Claude use Harvey? Anthropic's May 12, 2026 announcement lists Harvey among its connectors and says it "brings Harvey's legal intelligence into Claude." Check your Harvey agreement for what your organization is licensed to use.

Does Claude have a legal AI product? Anthropic launched Claude for the legal industry on May 12, 2026, with 20+ MCP connectors and 12 practice-area plugins. It runs on top of a Claude plan.

Can Claude do legal research with citations? Claude on its own answers from training data and can be wrong on specifics. Connected to a legal MCP server, it can pull the cited section text and give the official link. Check each citation against the link before you rely on it.

What does the MCP server cover? Statutes, regulations, court rules, constitutions and agency materials, found by search or by citation. For court opinions, add a case-law connector. See our guide on composing several legal MCP servers.

Is it safe to put client documents through Claude? That depends on the plan, the vendor terms and your jurisdiction's rules, and it applies equally to any tool you choose. Start with our guide to whether Claude is private enough for legal work and read the data-handling terms for each tool you connect.

How long does setup take? The config-file path takes a few minutes if you already have a Claude account and uv installed. The longer part is deciding which practice-area plugins and connectors to add.

Sources

• Claude for the legal industry (Anthropic, May 12, 2026): connectors, plugins, the Harvey connector
• Anthropic launches Claude for Legal (ABA Journal, May 14, 2026)
• Claude pricing page: Max plan price and limits
• Claude models overview: context window
• Harvey security page: certifications and controls
• Harvey developer documentation at developers.harvey.ai: API guides
• MCP setup guide and API documentation

Priyansh Khodiyar

Co-Founder & CTO

Priyansh leads engineering and AI at Vaquill AI: the pipelines that pull statutes, regulations and court rules from every US jurisdiction's official publisher, and the REST API, MCP server and open dataset that serve them.