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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
| Field | Required | Description |
|---|
| name | Yes | Identifier for the database (case-insensitive) |
| description | Yes | What data this database contains (used for auto-selection) |
| host | Yes | Database hostname |
| port | No | Port number (default: 1433) |
| database | Yes | Database name |
| user | Yes | Username |
| password | Yes | Password |
| encrypt | No | Enable TLS encryption (default: false) |
| tds_version | No | TDS 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 about | Look for description containing |
|---|
| users, accounts | users, accounts, customers |
| orders, sales | orders, transactions, sales |
| analytics, metrics | analytics, metrics, reports |
| logs, events | logs, 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
| Error | Solution |
|---|
| Config not found | Create connections.json in skill directory |
| Authentication failed | Check username/password in config |
| Connection timeout | Verify host/port, check firewall/VPN |
| TDS version error | Try "tds_version": "7.3" or "7.4" |
| Encryption error | Set "encrypt": true for Azure SQL |
| Permission warning | Run chmod 600 connections.json |
Exit Codes
- 0 : Success
- 1 : Error (config missing, auth failed, invalid query, database error)
Workflow
- Run
--list to show available databases
- Match user intent to database description
- Run
--tables or --schema to explore structure
- Execute query with appropriate
--limit (auto-converts to TOP N)
Weekly Installs
92
Repository
sanjay3290/ai-skills
GitHub Stars
169
First Seen
Feb 19, 2026
Security Audits
Gen Agent Trust HubPassSocketPassSnykPass
Installed on
gemini-cli89
github-copilot89
codex89
amp88
kimi-cli88
opencode88
