compare_json

THE RISK

Low Risk

Why compare_json needs a policy

This tool performs a read-only comparison operation on two JSON objects. It analyzes and returns information about differences but does not modify, create, delete, or execute any operations. The blast radius of misuse is minimal—an AI agent could only be shown incorrect comparison results, which would be informational only.

From the tool's definition Tool name 'compare_json' and description 'Compare two JSON objects and show differences' indicate a comparison/analysis operation that retrieves and displays differences without modifying, deleting, or executing code.

Documented attack patterns abuse exactly the kind of access compare_json gives an agent:

POLICY

How to control compare_json

PolicyLayer is an MCP gateway — it sits between your AI agents and IT Tools MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for compare_json:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "compare_json": {}
  }
}

compare_json is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register IT Tools MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about compare_json

What does the compare_json tool do? +

Compare two JSON objects and show differences. It is categorised as a Read tool in the IT Tools MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on compare_json? +

Register the IT Tools MCP Server MCP server in PolicyLayer and add a rule for compare_json: 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 IT Tools MCP Server. Nothing to install.

What risk level is compare_json? +

compare_json is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit compare_json? +

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

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

compare_json is provided by the IT Tools MCP Server MCP server (wrenchpilot/it-tools-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every IT Tools MCP Server tool call.

Start from IT Tools MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →