Strategy Lab

A backtesting and research toolkit that an AI coding agent can operate through MCP. Works with Claude Code, Cursor, Cherry Studio, OpenClaw, or any other MCP client.

The agent can pull data, measure it, write a strategy, backtest it, and then run the statistical checks that tell you whether the result is real or luck. Every result includes the context needed to judge it: the benchmark over the same bars, the exposure, how much the risk limits changed the strategy, the error bar on the score, and a list of plain-English warnings.

Not financial advice. This is research infrastructure, not a trading strategy. The example strategies included here are mostly negative results. Nothing in the platform promotes a strategy to real money automatically.

Quick start (no API keys needed)

python -m venv .venv
./.venv/Scripts/python.exe -m pip install -e ".[data,mcp,dev]"   # Windows
# . .venv/bin/activate && pip install -e ".[data,mcp,dev]"        # macOS / Linux
lab demo

lab demo generates synthetic price data, runs two backtests, and writes HTML reports. The numbers are meaningless (it's synthetic data), but it proves the install works.

To connect your agent:

cp .mcp.json.example .mcp.json     # Claude Code reads this on launch
python scripts/seed_findings.py    # loads the findings ledger with some method notes

Then ask the agent to run the audit_run prompt on the momentum run using cfg/demo.yaml. It will walk through the full validation checklist and record what it found.

For real data, yfinance needs no keys:

lab pull --source yfinance --tickers cfg/universe.txt --tf 1d --since 2015-01-01
lab backtest strategies/momo.py --config cfg/momo.yaml

Alpaca and other sources need keys in .env (copy .env.example).

Related MCP server: OpenFinClaw CLI

What the agent gets

37 tools, 3 resources and 2 prompts. Full reference in docs/mcp.md.

To serve the toolset to an agent on another machine:

lab-mcp --http --host 0.0.0.0 --port 8765

Design principles

Two timestamps on every record. Each data point has an event_time (when it happened) and a knowledge_time (when you could have known about it). The store filters on knowledge_time before anything else, so a strategy can never see data from the future. This applies to alt-data too: a congressional trade is invisible until its disclosure date.

The risk gate reports what it did. A rules-based gate sits between the strategy and the portfolio. Every result reports what fraction of orders it clipped or blocked. This matters because a heavily clipped strategy looks robust to parameter changes for the wrong reason.

Benchmarks use the same window. The benchmark is measured from the first tradeable bar, with warmup excluded, over both the full period and the out-of-sample window. Mismatched windows were the most common bug in earlier versions of this project, so the calculation now lives in one place.

Every score has an error bar. Around 230 daily bars gives a Sharpe ratio a standard error near 1.0. The toolset reports the error bar next to the number, and the bootstrap and permutation tools measure it directly.

Trial counts come from the registry. deflated_sharpe counts every backtest run against the same data, under any strategy name. Asking the user how many things they tried produced undercounts every time.

Runs archive their source. promote copies the code that actually produced a run, verified by hash. It does not copy whatever file currently sits at that path.

Thresholds live in one file. See lab/analysis/thresholds.py. Each constant has a comment explaining the mistake it prevents.

Limitations

• Best tested on daily-bar US equities. Intraday bars work, but transaction costs tend to kill intraday strategies before anything else does.

• Universes are current ticker lists, so backtests carry survivorship bias. There is no point-in-time universe.

• Data sources: yfinance (free, back to 2005), Alpaca (keys required, roughly 1,500 bars per symbol), a GovGreed alt-data adapter, and a synthetic adapter for tests and demos.

• One live broker (Alpaca). Paper trading by default. Real money requires a two-step manual opt-in.

• Background jobs run on the same machine as the server. There is no distributed execution.

• The included strategies are examples and negative results, not products.

Project layout

lab/
  store/      Parquet + DuckDB storage, two timestamps per record
  engine/     event loop, clock, strategy context, broker adapters
  risk/       the risk gate
  backtest/   runner, fills, metrics, reports, sweeps, walk-forward
  analysis/   windowed metrics, benchmark, error bars, neighbourhood check, thresholds
  mcp/        the MCP server and tools
  registry/   SQLite: runs, decisions, events, findings
  live/       paper/live runner, reconciliation, alerts, kill switch
  adapters/   yfinance, alpaca, govgreed, synthetic
  indicators/ pandas/numpy indicators, cached
  agent/      earlier self-driving research loop (see below)
  api/        FastAPI backend for the console
  cli.py      the `lab` command; every subcommand supports --json
strategies/   example strategies
cfg/          configs, universe files, research briefs
console/      React + TypeScript web console
docs/         mcp.md, guide.md, CONTRACTS.md, design docs

About lab/agent

Before the MCP toolset, this project had its own research loop that called LLM APIs directly, with its own provider abstraction, prompt caching, budget tracking and resume logic. That code still works and is still useful for unattended overnight runs. But a desktop agent already has all of that infrastructure, so the MCP server is now the primary interface. See docs/agents.md for the old loop.

Running the tests

./.venv/Scripts/python.exe -m pip install -e ".[data,mcp,agent,dev]"
./.venv/Scripts/python.exe -m pytest -q          # ~930 tests, about two minutes
cd console && npm run test && npm run typecheck

The suite includes guard tests that fail if a prompt references a tool or argument that doesn't exist, if the MCP layer imports private names from other packages, or if a benchmark is computed over a different window than the strategy.

License

MIT. See LICENSE.