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MSSQL MCP Server

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MSSQL MCP Server

A Model Context Protocol (MCP) server for connecting to Microsoft SQL Server databases. This server provides tools for executing SQL queries and managing database connections.

Installation

Installing via Smithery

To install MSSQL Database Connector for Claude Desktop automatically via Smithery:

npx -y @smithery/cli install @knight0zh/mssql-mcp-server --client claude

Manual Installation

npm install mssql-mcp-server

Related MCP server: MCP SQL Server

Usage

Add the server to your MCP settings configuration file:

{
  "mcpServers": {
    "mssql": {
      "command": "mssql-mcp-server",
      "env": {
        "MSSQL_CONNECTION_STRING": "Server=localhost;Database=master;User Id=sa;Password=yourpassword;",
        // Or individual connection parameters:
        "MSSQL_HOST": "localhost",
        "MSSQL_PORT": "1433",
        "MSSQL_DATABASE": "master",
        "MSSQL_USER": "sa",
        "MSSQL_PASSWORD": "yourpassword",
        "MSSQL_ENCRYPT": "false",
        "MSSQL_TRUST_SERVER_CERTIFICATE": "true"
      }
    }
  }
}

Tools

query

Execute a SQL query on a MSSQL database.

Parameters

  • connectionString (string, optional): Full connection string (alternative to individual parameters)

  • host (string, optional): Database server hostname

  • port (number, optional): Database server port (default: 1433)

  • database (string, optional): Database name (default: master)

  • username (string, optional): Database username

  • password (string, optional): Database password

  • query (string, required): SQL query to execute

  • encrypt (boolean, optional): Enable encryption (default: false)

  • trustServerCertificate (boolean, optional): Trust server certificate (default: true)

Either connectionString OR (host + username + password) must be provided.

Example

const result = await use_mcp_tool({
  server_name: 'mssql',
  tool_name: 'query',
  arguments: {
    host: 'localhost',
    username: 'sa',
    password: 'yourpassword',
    query: 'SELECT * FROM Users',
  },
});

Development

# Install dependencies
npm install

# Run in development mode
npm run dev

# Build
npm run build

# Run tests
npm test

# Run linter
npm run lint

# Format code
npm run format

License

MIT

Available Tools

1 tool
queryC

Execute a SQL query on a MSSQL database

ParametersJSON Schema
NameRequiredDescriptionDefault
connectionStringNoFull connection string (alternative to individual parameters)
hostNoDatabase server hostname
portNoDatabase server port (default: 1433)
databaseNoDatabase name (default: master)
usernameNoDatabase username
passwordNoDatabase password
queryYesSQL query to execute
encryptNoEnable encryption (default: false)
trustServerCertificateNoTrust server certificate (default: true)

TDQS

C2.9/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries full burden for behavioral disclosure. While 'Execute a SQL query' implies both read and write operations, it doesn't specify permissions needed, potential side effects, rate limits, or what happens with complex queries. For a database tool with zero annotation coverage, this leaves significant behavioral gaps.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, efficient sentence that directly states the tool's purpose without any unnecessary words. It's appropriately sized and front-loaded with the essential information.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a database query tool with 9 parameters, no annotations, and no output schema, the description is insufficient. It doesn't explain what types of queries are supported, what the return format looks like, error handling, or security considerations. The tool has significant complexity that isn't addressed.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, meaning all parameters are documented in the schema itself. The description doesn't add any parameter-specific information beyond what's already in the schema, so it meets the baseline for high schema coverage but doesn't provide additional value.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action ('Execute a SQL query') and target resource ('on a MSSQL database'), providing specific verb+resource information. However, with no sibling tools mentioned, there's no opportunity to distinguish from alternatives, preventing a perfect score.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives, prerequisites, or context for usage. It simply states what the tool does without any usage instructions or constraints.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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TDQS

B3.1/5.0
Disambiguation5/5

With only one tool, there is no possibility of ambiguity or overlap between tools, as there are no other tools to compare it to. The tool's purpose is clearly defined and distinct by default.

Naming Consistency5/5

Since there is only one tool, it inherently has perfect naming consistency with itself. The tool name 'query' follows a simple verb pattern, and there are no other tools to create inconsistency.

Tool Count2/5

A single tool for an MSSQL server is too few for the apparent scope, as it lacks basic operations like listing tables, describing schemas, or executing parameterized queries. This minimal set will likely cause agent failures due to incomplete functionality.

Completeness2/5

The tool surface is severely incomplete for an MSSQL database server. While the 'query' tool allows executing SQL, there are significant gaps such as no tools for metadata exploration, transaction management, or data manipulation beyond raw queries, which are essential for typical database workflows.

Maintenance

ActivityInactive
ResponsivenessSyncing

Resources

Unclaimed servers have limited discoverability.

Looking for Admin?

If you are the server author, to access and configure the admin panel.

Related MCP Connectors

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  • sql-mcp

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