Lean4 Tools

Beneficial-AI-Foundation/lean4-claude-plugin·1 plugin

Add Lean 4 language-server support in Claude Code when you write or check formal proofs in .lean projects.

Overview

lean4-tools is a plugin marketplace for the Build phase that adds Lean 4 language-server integration for theorem proving in Claude Code.

What is this marketplace?

Registers Lean 4 LSP via lake serve for .lean files
Maps .lean extension to the lean language id in Claude Code
Targets theorem proving and Mathlib-style development workflows
Single focused lean4 plugin (v1.0.0) in the marketplace bundle
strict:false allows flexible local marketplace installation
Marketplace lists 1 plugin: lean4 (v1.0.0)
LSP command: lake serve --
Extension mapping: .lean → lean

Compatible agents: Claude Code, any compatible agent

Community signal: 1 GitHub stars.

What problem does it solve?

Claude Code does not understand Lean 4 projects out of the box, so proof work feels disconnected from agent-assisted editing.

Who is it for?

Builders already using Lean 4 who want Claude Code to load Lean LSP for formal verification sessions.

Skip if: Teams with no Lean toolchain or anyone who only needs generic Python/TypeScript LSP setups.

What do I get? / Deliverables

After adding the marketplace, .lean files get LSP-backed support so agents and the editor can work inside your Lean 4 codebase.

lean4 plugin registered with Lean LSP command and .lean mapping
Agent-ready editing context for theorem-proving repositories

Plugins in this marketplace

1 plugin — install individually after you add the marketplace.

PluginVersion

Lean4Lean 4 language server for theorem proving1.0.0

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Journey fit

Primary fit

BuildAgent skills & templates

Formal verification work happens while building and iterating on code, not during early idea or launch tasks. The marketplace ships an LSP plugin wired to lake serve, which is agent/editor tooling rather than a standalone app feature.

How it compares

LSP plugin marketplace entry, not a standalone proof automation skill.

Common Questions / FAQ

Who is Lean4 Tools for?

It is for developers and researchers who prove theorems in Lean 4 and use Claude Code as their primary agent IDE.

When should I use Lean4 Tools?

Use it when you start or maintain a Lean 4 repo and want lake-based LSP wired into Claude Code for .lean files.

How do I add Lean4 Tools to my agent?

Register the Beneficial-AI-Foundation lean4-claude-plugin marketplace in Claude Code, then enable the lean4 plugin so lake serve runs as the Lean language server.