okama-mcp

MCP (Model Context Protocol) server that exposes the okama investment portfolio toolkit to AI assistants — Claude Desktop, Claude Code, Cursor, Codex, and any other MCP-compatible client.

With okama-mcp installed, you can ask an AI things like:

"Backtest a portfolio of 30% gold and 70% real estate over the last 15 years."

"Run a Monte Carlo retirement forecast on that portfolio, withdrawing $1,000/month indexed to inflation, over 25 years."

"What's the tangency portfolio of SPY, BND, and GLD with a 3% risk-free rate?"

…and the AI uses the MCP tools to call okama directly — no Python code needed.

Built on FastMCP. Single codebase, two transports: stdio (for local clients) and streamable-http (for self-hosting). okama-mcp is free and open source — no hosted service, no registration; you run it yourself, locally or on your own server.

Install

Requires Python ≥ 3.11 (same floor as okama itself); okama ≥ 2.2.0 is installed automatically.

The easiest way — no clone, no venv — is uv or pipx:

uvx okama-mcp stdio          # run straight from PyPI
# or
pipx install okama-mcp

Plain pip works too:

pip install okama-mcp

[!WARNING] _{With pip, prefer a dedicated virtual environment: on most modern Linux distros the system Python is marked externally managed (PEP 668), so pip install outside a venv fails, and a shared environment risks dependency conflicts. In your MCP client config, point command at the absolute path of the okama-mcp script inside the venv — GUI clients don't see your shell PATH. uvx and pipx avoid all of this by isolating the install automatically.}

To work on the code, install from source instead:

git clone https://github.com/mbk-dev/okama-mcp
cd okama-mcp
poetry install

Run

# stdio — for Claude Desktop, Claude Code, Cursor (local IPC)
okama-mcp stdio

# streamable HTTP — for self-hosting on your own server
okama-mcp http --host 127.0.0.1 --port 8765

When running from a source checkout, prefix each command with poetry run.

Connect a client

Claude Desktop

Edit ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):

{
  "mcpServers": {
    "okama": {
      "command": "uvx",
      "args": ["okama-mcp", "stdio"]
    }
  }
}

Restart Claude Desktop; the server appears in the tools menu.

Claude Code

To make the server available in every project (works from any directory):

claude mcp add --scope user okama -- uvx okama-mcp stdio

Developers running from a source checkout can use claude mcp add okama -- poetry run okama-mcp stdio from the project root instead.

Or commit a .mcp.json at the project root so the whole team picks it up:

{
  "mcpServers": {
    "okama": {
      "command": "uvx",
      "args": ["okama-mcp", "stdio"]
    }
  }
}

Cursor

Add the server to .cursor/mcp.json in your project (or ~/.cursor/mcp.json to make it global):

{
  "mcpServers": {
    "okama": {
      "command": "uvx",
      "args": ["okama-mcp", "stdio"]
    }
  }
}

Codex (CLI & Desktop)

Add the server with one command:

codex mcp add okama -- uvx okama-mcp stdio

Or declare it in ~/.codex/config.toml (or a project-scoped .codex/config.toml in trusted projects):

[mcp_servers.okama]
command = "uvx"
args = ["okama-mcp", "stdio"]

The Codex CLI, desktop app, and IDE extension share this configuration — set it up once and it works in all three.

Self-hosting (streamable HTTP)

Run okama-mcp on your own server and share it across your MCP clients:

okama-mcp http --host 127.0.0.1 --port 8765 --path /mcp

(From source: poetry run okama-mcp http ...)

Then point your MCP client at http://<your-server>:8765/mcp. For a production setup put nginx + TLS in front; ready-made examples live in deploy/:

• deploy/systemd/okama-mcp.service — systemd unit (hardened, runs as a dedicated user)
• deploy/nginx/self-hosted.conf — nginx vhost: TLS, SSE-friendly proxying of /mcp

The server is open by design — free to run, no registration. If your instance must not be public, restrict access at the nginx level (allow-list, VPN, or HTTP basic auth).

Tool catalog

A Monte Carlo retirement forecast (30% gold / 70% real estate, withdrawing $1,000/month indexed to inflation over 25 years) and the efficient frontier of SPY/BND/GLD — the exact examples from the top of this page:

All tools are stateless — pass the full portfolio specification with every call. The server caches expensive okama objects (Portfolio, EfficientFrontier) by content hash, so repeated calls on the same spec are fast.

Nested portfolios. Wherever a list of assets is accepted — the assets field of PortfolioSpec/FrontierSpec, or the portfolios argument on the comparison tools — an entry may be a ticker string or a nested portfolio object (the same spec shape). This lets you treat a whole portfolio as a single component: e.g. compare a 60/40 portfolio against gold, or put a sub-portfolio on the efficient frontier.

Search & metadata

Tool	Purpose
search_assets(query, namespace?)	Free-text search across all okama symbols by name / ticker / ISIN.
list_namespaces(kind="all"|"assets"|"macro")	Show the available okama namespaces.
get_asset_info(symbol)	Metadata for one symbol — name, country, currency, type, date range.

Single asset & comparisons

Tool	Purpose
get_asset_history(symbol, kind, first_date?, last_date?)	Time series for one asset. kind ∈ {close_monthly, close_daily, adj_close, ror, dividends}.
compare_assets(symbols, ccy, ..., portfolios?, rf_return?, t_return?)	Side-by-side statistics (describe() table: CAGR, risk, drawdowns by period) plus Sharpe & Sortino per asset.
get_correlations(symbols, ccy, ..., portfolios?)	Correlation matrix of monthly returns.
get_rolling_risk(symbols, ccy, window_months=12, ..., portfolios?)	Rolling annualized risk per asset.
get_asset_returns(symbols, ccy, ..., portfolios?, period?, real=False)	Return metrics per asset: CAGR, cumulative return, mean / real mean return, monthly geometric mean, annual returns table.
get_rolling_returns(symbols, ccy, window_months=12, real=False, ..., portfolios?)	Rolling CAGR and rolling cumulative return per asset.
get_benchmark_metrics(benchmark, symbols, ccy, ..., portfolios?, rolling_window?)	Beta, correlation, annualized tracking difference and tracking error of each asset vs a benchmark/index.
get_dividend_info(symbols, ccy, ...)	LTM dividend yield, 5y mean yield, paying/growing streaks per asset.

Portfolio backtest

Tool	Purpose
analyze_portfolio(portfolio, rf_return=0, t_return=0)	Headline metrics (CAGR, annual mean/risk, Sharpe, Sortino) + full describe() for a PortfolioSpec.
get_portfolio_drawdowns(portfolio)	Drawdown time series + max drawdown / recovery period.
get_portfolio_var_cvar(portfolio, time_frame=12, level=1)	Historical Value at Risk and CVaR.
get_portfolio_wealth_index(portfolio, full=False)	Wealth-index series (cumulative growth of 1000).
get_rolling_cagr(portfolio, window_months=12, real=False)	Rolling CAGR time series (optionally inflation-adjusted).
get_cagr_probability(portfolio, years, cagr_target)	Historical probability of CAGR below a target (e.g. of a loss) over N-year periods.

Monte Carlo DCF

Tool	Purpose
monte_carlo_forecast(portfolio, mc, cashflow)	Forward simulation with one of five cash-flow strategies (indexation, percentage, time_series, vanguard, cut_if_drawdown). Returns percentile wealth bands, terminal-wealth stats, survival metrics. Includes the money-weighted IRR distribution (percentiles + mean).
get_portfolio_irr(portfolio, cashflow)	Historical money-weighted return (IRR) for a contribution/withdrawal plan.
find_the_largest_withdrawals_size(portfolio, mc, cashflow, goal, ...)	Largest sustainable withdrawal (Monte Carlo) for a goal: keep real purchasing power, keep nominal balance, or survive N years.

Efficient Frontier

Tool	Purpose
build_efficient_frontier(frontier)	Full EF point table (Risk / Mean return / CAGR + per-asset weights).
get_tangency_portfolio(frontier, rf_return, rate_of_return)	Max-Sharpe portfolio on the EF.
get_min_variance_portfolio(frontier)	Global Minimum Variance portfolio.
get_most_diversified_portfolio(frontier, target_return?)	Most Diversified Portfolio (maximises the diversification ratio) on the EF.

Macro

Tool	Purpose
get_inflation(currency, first_date?, last_date?, include_cumulative?)	Inflation series for a currency (USD, EUR, RUB, …).
get_central_bank_rate(country, first_date?, last_date?)	Central-bank policy rate (US, ECB, RUS, …).

Charts

Each tool renders a PNG (default 1500×900) and returns it as MCP image content — clients like Claude Desktop display it inline. Every chart tool also accepts optional width / height (pixels, 300–4000) for custom sizes and aspect ratios, and an optional save_path — the chart is then also written to that file and the path reported back. Use save_path in clients that don't render MCP images in their UI (e.g. Claude Code's terminal): ask for a chart "saved to /tmp/chart.png" and open the file reference. Note: in self-hosted (streamable-http) deployments save_path is written on the server's filesystem, not the client's machine.

Tool	Chart
plot_wealth_index(portfolio)	Portfolio wealth index (+ inflation line).
plot_drawdowns(portfolio)	Drawdown depth over time.
plot_monte_carlo(portfolio, mc, cashflow)	Monte Carlo forecast fan (percentile bands).
plot_irr_distribution(portfolio, mc, cashflow)	Histogram of IRR across Monte Carlo scenarios (percentile markers).
plot_efficient_frontier(frontier)	EF curve with individual asset points.
plot_transition_map(frontier, x_axe="risk")	Transition map: asset weights along the efficient frontier (x-axis = risk or CAGR).
plot_assets(symbols, ccy, ..., portfolios?)	Wealth-index comparison of individual assets.

Spec shapes

The complex tools take typed dicts validated by pydantic. The full schemas live in src/okama_mcp/schemas.py; here are the headline shapes:

// PortfolioSpec
{
  "assets":   ["GLD.US", "VNQ.US"],  // each entry: a ticker OR a nested PortfolioSpec
  "weights":  [0.3, 0.7],            // optional, must sum to 1.0
  "ccy":      "USD",
  "first_date": "2010-01",
  "last_date":  "2024-12",
  "rebalancing_strategy": {            // mirrors okama.Rebalance
    "period": "year",                  // month | quarter | half-year | year | none
    "abs_deviation": 0.05,             // optional, |actual - target| threshold, 0 < x <= 1
    "rel_deviation": 0.1               // optional, |actual / target - 1| threshold, > 0
  },
  "inflation": true
}

// MCSpec
{
  "distribution":  "norm",            // norm | lognorm | t
  "period_years":  25,
  "scenarios":     500,                // ≤ 5000
  "percentiles":   [5, 50, 95],
  "random_seed":   42                  // optional, for reproducibility
}

// CashflowSpec — discriminated by `type`
{ "type": "indexation",       "initial_investment": 1000000, "frequency": "month", "amount": -1000, "indexation": "inflation" }
{ "type": "percentage",       "initial_investment": 1000000, "frequency": "year",  "percentage": -0.04 }
{ "type": "time_series",      "initial_investment": 100000,  "events":    { "2030-06": -50000 } }
{ "type": "vanguard",         "initial_investment": 1000000, "percentage": -0.04, "floor_ceiling": [-0.025, 0.05], "indexation": "inflation" }
{ "type": "cut_if_drawdown",  "initial_investment": 1000000, "frequency": "year",  "amount": -60000, "indexation": "inflation",
  "crash_threshold_reduction": [[0.2, 0.4], [0.5, 1.0]] }

// FrontierSpec
{
  "assets":   ["SPY.US", "BND.US", "GLD.US"],
  "ccy":      "USD",
  "bounds":   [[0.0, 0.7], [0.1, 1.0], [0.0, 0.3]],   // optional
  "n_points": 20,
  "rebalancing_strategy": { "period": "year" },
  "inflation": false
}

// Nesting — a portfolio used as a single component (works in PortfolioSpec /
// FrontierSpec `assets`, and the `portfolios` argument of the comparison tools):
{
  "assets": [
    "GLD.US",
    { "assets": ["SPY.US", "AGG.US"], "weights": [0.6, 0.4], "symbol": "bench6040.PF" }
  ],
  "weights": [0.3, 0.7]              // one weight per top-level entry
}

Development

The project follows TDD (see AGENTS.md). After every code change run:

poetry run pytest -q
poetry run ruff check .

To run the live-API integration test (hits api.okama.io):

poetry run pytest -m integration

Project layout

src/okama_mcp/
├── server.py          # FastMCP instance + registration entry point
├── transport.py       # CLI: `okama-mcp stdio | http`
├── schemas.py         # PortfolioSpec, MCSpec, CashflowSpec, FrontierSpec
├── cache.py           # TTL+LRU cache keyed by sha256 of canonical spec
├── serialization.py   # pandas → JSON-safe with smart truncation
├── errors.py          # Translate okama exceptions to actionable MCP errors
└── tools/
    ├── search.py, asset.py, asset_list.py
    ├── portfolio.py, monte_carlo.py
    ├── frontier.py, macro.py
    └── plots.py

License

MIT — same license as okama itself.