mql5-docs-mcp

An MCP server that gives coding agents (Claude Code, Cursor, Claude Desktop) the real MQL5 function signatures and error-code meanings, so they stop writing MQL4 syntax or inventing functions when they build MetaTrader 5 EAs.

It runs locally over stdio with a prebuilt index. It makes no network calls at runtime and needs no API key.

Tools

Example get_signature("CopyBuffer"):

CopyBuffer (Timeseries and Indicators Access)
int CopyBuffer(int indicator_handle, int buffer_num, int start_pos, int count, double buffer[])
int CopyBuffer(int indicator_handle, int buffer_num, datetime start_time, int count, double buffer[])
int CopyBuffer(int indicator_handle, int buffer_num, datetime start_time, datetime stop_time, double buffer[])
https://www.mql5.com/en/docs/series/copybuffer

Related MCP server: mt5-mcp

Status (v0.1)

The index covers all 517 functions in the official function index (name, section and doc link) and all 296 trade return codes and runtime errors. Exact signatures are indexed for 203 functions so far, because mql5.com rate-limited the indexer partway through. For the rest, get_signature returns the doc link. Running npm run build:index again resumes from .cache/ and fills in the gaps.

Install

Claude Code:

claude mcp add mql5-docs -- npx -y github:zafmy/mql5-docs-mcp

Any other MCP client (mcpServers config):

{ "mql5-docs": { "command": "npx", "args": ["-y", "github:zafmy/mql5-docs-mcp"] } }

Scope

Covered: MQL5 built-in functions from the official function index, trade server return codes and runtime error codes.

Not covered: Standard Library classes (CTrade and friends), backtesting, broker connections and compiling. The index stores names, signatures, sections and links only. For the full explanation, follow the link to mql5.com.

Develop

npm install
npm test               # builds and runs the tests against the bundled index
npm run build:index    # re-scrapes the reference slowly (4 s/page), resumable via .cache/
npm run build:index:offline  # rebuilds data/ from .cache/ only, no network

License

MIT for the code. MQL5 and MetaTrader are trademarks of MetaQuotes Ltd.; this project is not affiliated with them. Signatures and code descriptions come from the official MQL5 reference.