Official Verified

lean

Run QuantConnect LEAN backtests and manage US equity algorithm development. Use when asked to backtest a trading strategy, run a LEAN algorithm, analyze backtest results, download market data, or deploy to Interactive Brokers TWS. Covers algorithm creation, data management, config editing, and result analysis.

skill-install — Terminal

Install via CLI (Recommended)

clawhub install openclaw/skills/skills/cylqqqcyl/lean-engine

Download Source Code (.zip)

LEAN Engine — QuantConnect Algorithmic Trading

Prerequisites & Setup

Required Environment Variables

Variable	Purpose	Example
`LEAN_ROOT`	Path to cloned LEAN repository	`/home/user/lean`
`DOTNET_ROOT`	Path to .NET SDK installation	`/home/user/.dotnet`
`PYTHONNET_PYDLL`	Path to Python shared library (required by LEAN's pythonnet)	`$LEAN_ROOT/.libs/libpython3.11.so.1.0`

All three must be set before using this skill. Add to your shell profile:

export LEAN_ROOT="$HOME/lean"
export DOTNET_ROOT="$HOME/.dotnet"
export PATH="$PATH:$DOTNET_ROOT"
export PYTHONNET_PYDLL="$LEAN_ROOT/.libs/libpython3.11.so.1.0"

Note: LEAN bundles its own Python shared library in $LEAN_ROOT/.libs/. If you built LEAN from source, the library should be there after dotnet build. If not, install libpython3.11-dev and point PYTHONNET_PYDLL to your system's libpython3.11.so.

First-Time Setup

Install .NET 8 SDK:

# Linux/macOS
wget https://dot.net/v1/dotnet-install.sh -O dotnet-install.sh
chmod +x dotnet-install.sh
./dotnet-install.sh --channel 8.0
export DOTNET_ROOT="$HOME/.dotnet"
export PATH="$PATH:$DOTNET_ROOT"

Clone and build LEAN:

git clone https://github.com/QuantConnect/Lean.git "$LEAN_ROOT"
cd "$LEAN_ROOT"
dotnet build QuantConnect.Lean.sln -c Debug

Download initial market data:

pip install yfinance pandas
python3 {baseDir}/scripts/download_us_universe.py --symbols sp500 --start 2020-01-01 --data-dir "$LEAN_ROOT/Data"

Verify setup:

ls "$LEAN_ROOT/Data/equity/usa/daily/"  # Should list .zip files
ls "$LEAN_ROOT/Launcher/bin/Debug/"      # Should contain QuantConnect.Lean.Launcher.dll

Environment

LEAN source: $LEAN_ROOT/
Launcher (pre-built): $LEAN_ROOT/Launcher/bin/Debug/
Config: $LEAN_ROOT/Launcher/config.json
Python algos: $LEAN_ROOT/Algorithm.Python/
Market data: $LEAN_ROOT/Data/
dotnet: $DOTNET_ROOT/dotnet (add to PATH: export PATH="$PATH:$DOTNET_ROOT")

Quick Reference

Run a Backtest

Place algorithm in $LEAN_ROOT/Algorithm.Python/YourAlgo.py

Edit config to point to it:

# Update config.json — set these fields:
# "algorithm-type-name": "YourClassName"
# "algorithm-language": "Python"
# "algorithm-location": "../../../Algorithm.Python/YourAlgo.py"

Run:

export PATH="$PATH:$DOTNET_ROOT"
cd "$LEAN_ROOT/Launcher/bin/Debug"
dotnet QuantConnect.Lean.Launcher.dll

Results appear in stdout + $LEAN_ROOT/Results/

Or use the helper script:

bash {baseDir}/scripts/run_backtest.sh YourClassName YourAlgo.py

Config Editing

Edit $LEAN_ROOT/Launcher/config.json with these key fields:

Read Full Documentation on GitHub

Metadata

Author@cylqqqcyl

Stars3409

Updated2026-03-25

View Author Profile

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Add to Configuration

Paste this into your clawhub.json to enable this plugin.

{
  "plugins": {
    "official-cylqqqcyl-lean-engine": {
      "enabled": true,
      "auto_update": true
    }
  }
}

Safety NoteClawKit audits metadata but not runtime behavior. Use with caution.

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