MSSQL MCP Reader

Attribution: Fork of ConnorBritain/mssql-mcp-server (MIT). Patched to use DefaultAzureCredential (with tenantId) instead of InteractiveBrowserCredential. Patched core (@connorbritain/mssql-mcp-core) is bundled into this package — no upstream registry dependency at install time.

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.

Architecture

This package is a thin wrapper around @connorbritain/mssql-mcp-core, which contains all shared logic, tools, and governance features. The wrapper selects the "reader" tier and delegates to the core's startMcpServer() function. This design enables:

• Hard separation at the package level — regulated enterprises can guarantee that certain builds physically cannot perform destructive operations
• Independent versioning — each tier can be published separately with its own release cycle
• Clear audit trail — "we only allow mssql-mcp-reader in prod" is a compile-time guarantee

The core library handles all SQL Server connections, tool dispatch, audit logging, and governance enforcement.

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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

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Config Builder — Visual wizard to generate your mcp_config.json and environments.json files.

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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

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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"
      }
    }
  }
}

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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

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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

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Documentation

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

MSSQL MCP Server Documentation

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License

MIT License. See LICENSE for details.

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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