connect_db

THE RISK

Low Risk

Why connect_db needs a policy

This tool establishes a database connection but does not read, write, execute queries, or modify data. It is a connectivity/setup operation. While misconfigured connections could expose credentials or connect to unintended databases, the tool itself does not perform any data operation, placing it in 'Other'. Severity is low as it is a prerequisite step rather than a direct data action.

From the tool's definition Connect to MySQL database using URL or config

Documented attack patterns abuse exactly the kind of access connect_db gives an agent:

POLICY

How to control connect_db

PolicyLayer is an MCP gateway — it sits between your AI agents and MCP-MongoDB-MySQL-Server, and nothing reaches the server without passing your rules. This is the rule we recommend for connect_db:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "connect_db": {
      "limits": [
        {
          "counter": "connect_db_rate",
          "window": "minute",
          "max": 60,
          "scope": "grant"
        }
      ]
    }
  }
}

connect_db gets a rate cap, and everything else on the server is denied unless you say otherwise.

Create a free account and register MCP-MongoDB-MySQL-Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

SET A RULE FOR THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More MCP-MongoDB-MySQL-Server tools

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All 14 MCP-MongoDB-MySQL-Server tools →

Other tools on other servers

Android Forensics ADB MCP Server generate_app_analysis_report Ethereum Tools add Math MCP Server complex_analysis_suite Crypto_MCP aes_encrypt

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Tool risk categories → How PolicyLayer classifies MCP tools by what they can do.
MCP tool → What an MCP tool is and how clients discover and call it.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about connect_db

What does the connect_db tool do? +

Connect to MySQL database using URL or config. It is categorised as a Other tool in the MCP-MongoDB-MySQL-Server MCP Server, which means it performs auxiliary operations.

How do I enforce a policy on connect_db? +

Register the MCP-MongoDB-MySQL-Server MCP server in PolicyLayer and add a rule for connect_db: 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 MCP-MongoDB-MySQL-Server. Nothing to install.

What risk level is connect_db? +

connect_db is a Other tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit connect_db? +

Yes. Add a rate_limit block to the connect_db 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_db completely? +

Set action: deny in the PolicyLayer policy for connect_db. 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_db? +

connect_db is provided by the MCP-MongoDB-MySQL-Server MCP server (yaoxiaolinglong/mcp-mongodb-mysql-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP-MongoDB-MySQL-Server tool call.

Start from MCP-MongoDB-MySQL-Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →