@esetnik/mssql-mcp-reader

Thin launcher for @connorbritain/mssql-mcp-reader preloaded with @esetnik/mssql-mcp-core — a fork of the upstream core that adds:

• Direct ODBC connection strings via SQL_CONNECTION_STRING
• Windows Integrated Authentication via msnodesqlv8
• REQUEST_TIMEOUT env var that sets both connection and command timeouts
• Classified query error codes (QUERY_TIMEOUT, INVALID_COLUMN, SYNTAX_ERROR, etc.) with SQL Server's error message passed through for non-connection errors

Install in Claude Code

claude mcp add mssql -s user \
  -e "SQL_CONNECTION_STRING=Driver={ODBC Driver 17 for SQL Server};Server=your-host;Database=your-db;Trusted_Connection=Yes;Encrypt=No;TrustServerCertificate=Yes;Connection Timeout=60;" \
  -e SQL_DRIVER=msnodesqlv8 \
  -e REQUEST_TIMEOUT=300 \
  -- npx -y @esetnik/mssql-mcp-reader

How it works

The mssql Node driver is a singleton once imported. To swap in msnodesqlv8 (the Windows-auth-capable driver) you have to patch it before the reader imports it. This package's bin/mssql-mcp-reader.js spawns a fresh node process with --import <preload-driver.js> pointing at the core's preloader, then executes the upstream reader's entry point as argv[1]. The preloader runs first, patches mssql, and only then does the reader load.

License

MIT. Depends on upstream MIT-licensed packages by Connor England.