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gbfeliped

mcp-sqlserver-readonly

by gbfeliped
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TypeScript
Remote

mcp-sqlserver

Read-only SQL Server MCP server for Claude Desktop (and any MCP-compatible client).

Tools exposed

Tool

Description

query

Run a SELECT query

list_tables

List all user tables with row-count estimate and size

describe_table

Show columns, types, nullability, PK for a table

list_schemas

List user-defined schemas

Related MCP server: MSSQL MCP Python Server

Security protections

Attack

Example

Status

Direct writes

DROP, DELETE, UPDATE, INSERT

✅ Blocked

Multiple statements

SELECT 1; DROP TABLE t

✅ Blocked

System procedures

xp_cmdshell, EXEC sp_help

✅ Blocked

DoS

WAITFOR DELAY '0:0:5'

✅ Blocked

Whitespace bypass

tabs and newlines between keywords

✅ Blocked

Comment bypass

/* */ and -- before keywords

✅ Blocked

Valid queries

SELECT, SELECT TOP, COUNT, WHERE

✅ Allowed

Environment variables

Variable

Required

Default

Description

MSSQL_SERVER

✅

—

Server hostname or IP

MSSQL_DATABASE

✅

—

Database name

MSSQL_USER

✅

—

SQL login username

MSSQL_PASSWORD

✅

—

SQL login password

MSSQL_PORT

1433

TCP port

MSSQL_ENCRYPT

true

Enable TLS (true/false)

MSSQL_TRUST_SERVER_CERTIFICATE

false

Trust self-signed certs

Build

npm install
npm run build

Claude Desktop configuration

Add to %APPDATA%\Claude\claude_desktop_config.json:

{
  "mcpServers": {
    "sqlserver": {
      "command": "node",
      "args": ["../path-to/mcp-sqlserver/dist/index.js"],
      "env": {
        "MSSQL_SERVER": "localhost",
        "MSSQL_DATABASE": "MyDatabase",
        "MSSQL_USER": "sa",
        "MSSQL_PASSWORD": "YourPassword",
        "MSSQL_TRUST_SERVER_CERTIFICATE": "true"
      }
    }
  }
}

This server cannot be installed

A
license - permissive license
-
quality - not tested
C
maintenance

How are these scores calculated?

Maintenance

–Maintainers
–Response time
–Release cycle
–Releases (12mo)
Commit activity

Resources

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