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✦ Free & open sourceLegal

Lavern

An agentic law firm with 67 AI agents and evidence-backed debate.

A multi-agent legal system

67 specialist AI agents that review documents through evidence-backed debate.

Free forever · open source · Apache-2.0
✓ Light setup✓ Browser-based✓ Real-time collaboration
6.6
ZEKAI
Open-source agentic law firm prototype
Free & open source · Legal
Ease of setup5
Usefulness7
Maintenance9.5
Community5
★ 311
GITHUB
Sep 2026
UPDATED
Apache-2.0
LICENSE
🛠 Don't want to self-host? We can set it up →
⚡ Quick answer

Lavern coordinates 59 specialists and 7 orchestrators through a structured debate protocol to review legal documents. It features mandatory human gates and a 10-pass verification loop for critical decisions. Built for legal professionals and developers looking to test multi-agent architectures.

Runs on
Web
Hosting
Self-host
Languages
TypeScript
License
Apache-2.0

What it is

The system reads documents, posts findings with cited evidence, runs three layers of verification, and pauses at a human gate before critical decisions land. It includes 21 MCP tools for debate, scoring, and verification, plus a persistent precedent board across engagements.

Who it's for

Suits legal tech developers, firm founders, and engineers experimenting with multi-agent coordination frameworks. It does not suit practitioners seeking an out-of-the-box commercial legal product with guaranteed output quality.

Key features

67 Agent Prompts

59 specialists, 7 orchestrators, and 1 generic base orchestrator coordinating workflows.

Debate Protocol

Agents must cite specific text from the parsed document to enter findings on the board.

Three-Layer Verification

Evaluator gate, adversarial debate, and a 10-pass verification pipeline fail closed independently.

Precedent Board

Persistent memory across engagements that reinforces recurring findings and decays stale ones.

Autonomous Clawern Mode

Processes new documents on a 30-minute heartbeat and pushes findings to Telegram or email.

How to start

Up and running in 3 steps

1
Run the curl or PowerShell installation script to clone the repository and install dependencies.
2
Add your ANTHROPIC_API_KEY or MISTRAL_API_KEY to the auto-created .env file.
3
Run npm run serve:dev for the API server and start the React dashboard for the UI.
Real talk

Our honest verdict

What's great

  • Runs against Anthropic Claude, Mistral AI in the EU, or locally via Ollama
  • Mechanical grounding verifier cross-checks every cited quote via string matching
  • Includes 5 seeded legal datasets like CUAD, MAUD, and LEDGAR for testing
  • Features an editorial React dashboard with live activity feeds and audit bundles

Where it falls short

  • Legal-quality claims are an open empirical hypothesis without independent validation
  • Requires API keys for Anthropic or Mistral for real engagements, plus running a local server
  • One feature, the Lavern Challenge, still directly instantiates the Anthropic client in EU mode
  • Requires managing Node.js dependencies for both backend and frontend visualization components
Cost

Pricing & license

Free under the Apache 2.0 license. The only direct cost is running the infrastructure yourself and paying for the underlying LLM API tokens (Anthropic or Mistral) unless operating locally via Ollama.

Paid work

Open remote AI-training roles

767 open remote AI-training roles, updated November 14, 2026; most pay $20–$175 an hour. Zekai lists them free; the application goes to the employer’s platform.

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Questions

FAQ

Is Lavern ready to use as a commercial product?

No. The author explicitly states this is not a product, but rather a collection of ideas and source of inspiration.

Can I run this entirely locally without sending data to US or EU cloud providers?

Yes, you can run the system locally via Ollama by configuring the provider setting.

What happens in EU mode?

Setting the provider to Mistral routes the orchestrators, agents, debate, and verification through Mistral AI in Paris.

Radar

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