MSSQL MCP Reader

Read-only Model Context Protocol server for Microsoft SQL Server.

Safe schema discovery, profiling, and querying with zero risk of data modification. Ideal for analysts, auditors, and anyone who needs database exploration without write access.

Package Tiers

| Package | npm | Tools | Use Case | |---------|-----|-------|----------| | mssql-mcp-reader (this) | @connorbritain/mssql-mcp-reader | 14 read-only | Analysts, auditors, safe exploration | | mssql-mcp-writer | @connorbritain/mssql-mcp-writer | 17 (reader + data ops) | Data engineers, ETL developers | | mssql-mcp-server | @connorbritain/mssql-mcp-server | 20 (all tools) | DBAs, full admin access |

Tools Included

| Category | Tools | |----------|-------| | Discovery | search_schema, describe_table, list_table, list_databases, list_environments | | Profiling | profile_table, inspect_relationships, inspect_dependencies, explain_query | | Querying | read_data (SELECT only) | | Scripts | list_scripts, run_script (readonly scripts only) | | Operations | test_connection, validate_environment_config |

Not included: insert_data, update_data, delete_data, create_table, create_index, drop_table

Quick Start

Install

npm install -g @connorbritain/mssql-mcp-reader@latest

MCP Client Configuration

{
  "mcpServers": {
    "mssql": {
      "command": "npx",
      "args": ["@connorbritain/mssql-mcp-reader@latest"],
      "env": {
        "SERVER_NAME": "127.0.0.1",
        "DATABASE_NAME": "mydb",
        "SQL_AUTH_MODE": "sql",
        "SQL_USERNAME": "readonly_user",
        "SQL_PASSWORD": "YourPassword123"
      }
    }
  }
}

Configuration

| Variable | Required | Notes | |----------|----------|-------| | SERVER_NAME | Yes | SQL Server hostname/IP | | DATABASE_NAME | Yes | Target database | | SQL_AUTH_MODE | | sql, windows, or aad (default: aad) | | SQL_USERNAME / SQL_PASSWORD | | Required for sql/windows modes | | ENVIRONMENTS_CONFIG_PATH | | Path to multi-environment JSON config | | SCRIPTS_PATH | | Path to named SQL scripts directory | | AUDIT_LOG_PATH | | Custom audit log path |

Features

All packages in the MSSQL MCP family share:

• Multi-environment support - Named database environments (prod, staging, dev) with per-environment policies
• Governance controls - allowedTools, deniedTools, allowedSchemas, deniedSchemas, requireApproval
• Audit logging - JSON Lines logs with session IDs and auto-redaction
• Secret management - ${secret:NAME} placeholders for secure credential handling
• Named SQL scripts - Pre-approved parameterized queries with governance controls

Documentation

Full documentation, configuration examples, and governance details are available in the main repository:

MSSQL MCP Server Documentation

License

MIT License. See LICENSE for details.

Repository: https://github.com/ConnorBritain/mssql-mcp-reader Issues: https://github.com/ConnorBritain/mssql-mcp-reader/issues npm: https://www.npmjs.com/package/@connorbritain/mssql-mcp-reader