# AXLE Lean Engine

> Use this tool when you need to streamline Lean 4 proof engineering without a local installation, solving problems like broken theorem repairs and proof validation. It provides 16 tools for tasks such as proof checking, simplification, and counterexample discovery, accepting input via the AXLE CLI and outputting validated proofs. Ideal for use cases requiring efficient proof engineering and validation, especially when a local Lean setup is not feasible.

Canonical page: https://skillsregistry.net/skills/vilin97-axle-lean-engine  
JSON: https://api.skillsregistry.net/v1/skills/vilin97-axle-lean-engine

## Description

Provides 16 tools that wrap the AXLE CLI for Lean 4 proof engineering without requiring a local Lean installation. Supports proof checking and validation, automatic proof repair for broken or sorry'd theorems, proof simplification by removing redundant tactics, counterexample discovery via property-based testing, and structural transformations including theorem extraction, merging, and renaming. Requires the axle binary to be installed and accessible.

## Trust

- **Trust score (0–1):** 0.65
- **Verification tier:** scanned
- **Last scanned:** 2026-09-02

## Facts

- **Version:** 1.0.0
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** other
- **Updated:** 2026-09-02

## Source

- **Source listing:** [PulseMCP](https://www.pulsemcp.com/servers/vilin97-axle-lean-engine)
- **Repository:** <https://github.com/vilin97/axle-mcp>

## Use it

Resolve this record through the SkillsRegistry MCP server (no auth, read-only):

```
claude mcp add --transport http --scope user skillsregistry https://api.skillsregistry.net/mcp
```

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_skill",
    "arguments": {
      "slug": "vilin97-axle-lean-engine"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/vilin97-axle-lean-engine` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/vilin97-axle-lean-engine/pull`

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