generate_query · QueryNest MCP: Risk & Policy

WHAT IT DOES

What generate_query does on QueryNest

AI agents invoke generate_query to trigger actions in QueryNest. 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 generate_query needs a policy

The tool generates and executes MongoDB queries. While it mentions user confirmation before execution, the tool ultimately runs arbitrary database queries. Depending on the generated query, this could include read, write, or destructive operations. Since execution of arbitrary queries is the primary action, and the blast radius of a misused query executor is high, this is classified as Execute with high severity.

From the tool's definition 生成MongoDB查询语句并要求用户确认后执行 — 'execute' (执行) indicates the tool runs the generated query against the database

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

generate_query Rate-limited

generate_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": {
    "generate_query": {
      "limits": [
        {
          "counter": "generate_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 QueryNest, so you can run agents against it safely.

FAQ

Questions about generate_query

What does the generate_query tool do? +

智能查询生成工具：生成MongoDB查询语句并要求用户确认后执行. It is categorised as a Execute tool in the QueryNest MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on generate_query? +

Register the QueryNest MCP server in PolicyLayer and add a rule for generate_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 QueryNest. Nothing to install.

What risk level is generate_query? +

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

Can I rate-limit generate_query? +

Yes. Add a rate_limit block to the generate_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 generate_query completely? +

Set action: deny in the PolicyLayer policy for generate_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 generate_query? +

generate_query is provided by the QueryNest MCP server (niuzaishu/querynest). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.