sanitize_query · Query Sanitizer MCP: Risk & Policy

WHAT IT DOES

What sanitize_query does on Query Sanitizer

AI agents use sanitize_query to create or update resources in Query Sanitizer — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Query Sanitizer environment.

WHY IT NEEDS A POLICY

Why sanitize_query needs a policy

Based on the server description, sanitize_query likely redacts/transforms input text by replacing sensitive data with placeholders before forwarding to external LLMs. This is a data modification operation (Write) — it alters the content reversibly (placeholders can be restored via 'restore_response').

From the tool's definition Tool name: 'sanitize_query'; server description mentions 'sanitize queries' and 'redacts sensitive information from prompts using local models'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

sanitize_query Rate-limited

sanitize_query stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "sanitize_query": {
      "limits": [
        {
          "counter": "sanitize_query_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about sanitize_query

What does the sanitize_query tool do? +

sanitize_query. It is categorised as a Write tool in the Query Sanitizer MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on sanitize_query? +

Register the Query Sanitizer MCP server in PolicyLayer and add a rule for sanitize_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 Query Sanitizer. Nothing to install.

What risk level is sanitize_query? +

sanitize_query is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit sanitize_query? +

Yes. Add a rate_limit block to the sanitize_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 sanitize_query completely? +

Set action: deny in the PolicyLayer policy for sanitize_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 sanitize_query? +

sanitize_query is provided by the Query Sanitizer MCP server (vidoluco/query-sanitizer-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.