connect-database · MSSQL MCP Server MCP: Risk & Policy

WHAT IT DOES

What connect-database does on MSSQL MCP Server

AI agents use connect-database to create or update resources in MSSQL MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your MSSQL MCP Server environment.

WHY IT NEEDS A POLICY

Why connect-database needs a policy

Creating or establishing a database connection modifies the client's session state, making it a Write operation rather than a Read operation. This is reversible (via disconnect) and has medium severity since the tool itself only initiates a connection—the damage potential depends on what queries are subsequently executed by the agent.

From the tool's definition Tool is named 'connect-database' and described as connecting to MSSQL database server. The server description states it enables 'database connections' and supports 'executing secure SELECT queries'.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

connect-database Rate-limited

connect-database stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "connect-database": {
      "limits": [
        {
          "counter": "connect-database_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches MSSQL MCP Server, so you can run agents against it safely.

FAQ

Questions about connect-database

What does the connect-database tool do? +

連接到 MSSQL 資料庫伺服器. It is categorised as a Write tool in the MSSQL MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on connect-database? +

Register the MSSQL MCP Server MCP server in PolicyLayer and add a rule for connect-database: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches MSSQL MCP Server. Nothing to install.

What risk level is connect-database? +

connect-database is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit connect-database? +

Yes. Add a rate_limit block to the connect-database rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block connect-database completely? +

Set action: deny in the PolicyLayer policy for connect-database. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides connect-database? +

connect-database is provided by the MSSQL MCP Server MCP server (nakiriyuuzu/mssql-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.