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mssql

Execute read-only SQL queries against multiple Microsoft SQL Server databases. Use when: (1) querying MSSQL/SQL Server databases, (2) exploring database schemas/tables, (3) running SELECT queries for data analysis, (4) checking database contents. Supports multiple database connections with descriptions for intelligent auto-selection. Blocks all write operations (INSERT, UPDATE, DELETE, DROP, etc.) for safety.

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sanjay3290/ai-skills

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See how to install

Files included (6)

  • SKILL.md4.2 KB
  • .gitignore282 B
  • connections.example.json950 B
  • README.md2.0 KB
  • requirements.txt18 B
  • scripts/query.py11.0 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

MSSQL Read-Only Query Skill

Execute safe, read-only queries against configured Microsoft SQL Server databases.

Requirements

  • Python 3.8+
  • pymssql: pip install -r requirements.txt

Setup

Create connections.json in the skill directory or ~/.config/claude/mssql-connections.json.

Security: Set file permissions to 600 since it contains credentials:

chmod 600 connections.json

{
  "databases": [
    {
      "name": "production",
      "description": "Main app database - users, orders, transactions",
      "host": "db.example.com",
      "port": 1433,
      "database": "app_prod",
      "user": "readonly_user",
      "password": "your-password",
      "encrypt": true,
      "tds_version": "7.3"
    }
  ]
}

Config Fields

FieldRequiredDescription
nameYesIdentifier for the database (case-insensitive)
descriptionYesWhat data this database contains (used for auto-selection)
hostYesDatabase hostname
portNoPort number (default: 1433)
databaseYesDatabase name
userYesUsername
passwordYesPassword
encryptNoEnable TLS encryption (default: false)
tds_versionNoTDS protocol version: 7.0, 7.1, 7.2, 7.3, 7.4 (default: auto)

Usage

List configured databases

python3 scripts/query.py --list

Query a database

python3 scripts/query.py --db production --query "SELECT TOP 10 * FROM users"

List tables

python3 scripts/query.py --db production --tables

Show schema

python3 scripts/query.py --db production --schema

Limit results

python3 scripts/query.py --db production --query "SELECT * FROM orders" --limit 100

Note: MSSQL uses TOP N instead of LIMIT. The --limit flag automatically inserts TOP N after SELECT.

Database Selection

Match user intent to database description:

User asks aboutLook for description containing
users, accountsusers, accounts, customers
orders, salesorders, transactions, sales
analytics, metricsanalytics, metrics, reports
logs, eventslogs, events, audit

If unclear, run --list and ask user which database.

Safety Features

  • Read-only enforcement: Query validation blocks write operations (use a db_datareader role user for server-side protection)
  • Query validation: Only SELECT, SHOW, EXPLAIN, WITH, SP_HELP queries allowed
  • Single statement: Multiple statements per query rejected
  • TLS support: Configurable encryption for secure connections
  • Query timeout: 30-second timeout enforced via pymssql
  • Connection timeout: 10-second login timeout
  • Memory protection: Max 10,000 rows per query to prevent OOM
  • Column width cap: 100 char max per column for readable output
  • Credential sanitization: Error messages don't leak passwords

Troubleshooting

ErrorSolution
Config not foundCreate connections.json in skill directory
Authentication failedCheck username/password in config
Connection timeoutVerify host/port, check firewall/VPN
TDS version errorTry "tds_version": "7.3" or "7.4"
Encryption errorSet "encrypt": true for Azure SQL
Permission warningRun chmod 600 connections.json

Exit Codes

  • 0: Success
  • 1: Error (config missing, auth failed, invalid query, database error)

Workflow

  1. Run --list to show available databases
  2. Match user intent to database description
  3. Run --tables or --schema to explore structure
  4. Execute query with appropriate --limit (auto-converts to TOP N)

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