execute-query · MCP Firebird MCP: Risk & Policy

WHAT IT DOES

What execute-query does on MCP Firebird

AI agents invoke execute-query to trigger actions in MCP Firebird. 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 execute-query needs a policy

This tool allows execution of arbitrary SQL queries. Although it mentions pagination support (FIRST/ROWS), this suggests read-focused design, the core capability is query execution. Without evidence that the tool explicitly blocks destructive SQL (DELETE, DROP, etc.), it must be classified as Execute rather than Read.

From the tool's definition Tool description states it 'Executes a SQL query in the Firebird database.' The verb 'executes' combined with arbitrary SQL query capability means the tool can run any SQL statement, including those with side effects (UPDATE, INSERT, DELETE).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

execute-query Rate-limited

execute-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": {
    "execute-query": {
      "limits": [
        {
          "counter": "execute-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 MCP Firebird, so you can run agents against it safely.

FAQ

Questions about execute-query

What does the execute-query tool do? +

Executes a SQL query in the Firebird database. Uses FIRST/ROWS for pagination. It is categorised as a Execute tool in the MCP Firebird MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on execute-query? +

Register the MCP Firebird MCP server in PolicyLayer and add a rule for execute-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 MCP Firebird. Nothing to install.

What risk level is execute-query? +

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

Can I rate-limit execute-query? +

Yes. Add a rate_limit block to the execute-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 execute-query completely? +

Set action: deny in the PolicyLayer policy for execute-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 execute-query? +

execute-query is provided by the MCP Firebird MCP server (luancamara/mcpfirebird). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.