db_mysql_query · Infra Ops MCP: Risk & Policy

WHAT IT DOES

What db_mysql_query does on Infra Ops

AI agents invoke db_mysql_query to trigger actions in Infra Ops. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why db_mysql_query needs a policy

Despite being described as 'read-only', this tool executes arbitrary MySQL queries against a database. The actual enforcement of read-only constraints depends on implementation — if it simply passes query strings to MySQL, a malicious or misconfigured query could cause harm. The 'Execute' category applies because it runs database queries whose effects depend on the arguments passed.

From the tool's definition Execute a read-only MySQL query

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

db_mysql_query Rate-limited

db_mysql_query stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "db_mysql_query": {
      "limits": [
        {
          "counter": "db_mysql_query_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about db_mysql_query

What does the db_mysql_query tool do? +

Execute a read-only MySQL query. It is categorised as a Execute tool in the Infra Ops MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on db_mysql_query? +

Register the Infra Ops MCP server in PolicyLayer and add a rule for db_mysql_query: 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 Infra Ops. Nothing to install.

What risk level is db_mysql_query? +

db_mysql_query is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit db_mysql_query? +

Yes. Add a rate_limit block to the db_mysql_query 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 db_mysql_query completely? +

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

db_mysql_query is provided by the Infra Ops MCP server (skyvanguard/infra-ops-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.