tool_query · Mcp Excel MCP: Risk & Policy

WHAT IT DOES

What tool_query does on Mcp Excel

AI agents invoke tool_query to trigger actions in Mcp Excel. 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 tool_query needs a policy

The server's purpose is SQL-based querying of files. A 'query' tool on such a server likely executes SQL statements. While basic SELECT queries would be Read, the ability to run arbitrary SQL (including destructive statements) elevates this to Execute. The presence of sibling tools 'tool_drop_view' (Destructive) and 'tool_create_view' (Write) suggests this tool may permit broader SQL execution.

From the tool's definition Tool name 'tool_query' on a server described as 'querying Excel and CSV files using SQL via natural language'. Empty description reduces confidence.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

tool_query Rate-limited

tool_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": {
    "tool_query": {
      "limits": [
        {
          "counter": "tool_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 Excel, so you can run agents against it safely.

FAQ

Questions about tool_query

What does the tool_query tool do? +

tool_query. It is categorised as a Execute tool in the Mcp Excel MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on tool_query? +

Register the Mcp Excel MCP server in PolicyLayer and add a rule for tool_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 Excel. Nothing to install.

What risk level is tool_query? +

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

Can I rate-limit tool_query? +

Yes. Add a rate_limit block to the tool_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 tool_query completely? +

Set action: deny in the PolicyLayer policy for tool_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 tool_query? +

tool_query is provided by the Mcp Excel MCP server (ivan-loh/mcp-excel). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.