v8_object_compare

SERVERJshookmcp SOURCE@jshookmcp/jshook

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-vmoranv-jshookmcp/v8-object-compare.md

WHAT IT DOES

What v8_object_compare does on Jshookmcp

AI agents call v8_object_compare to retrieve information from Jshookmcp without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why v8_object_compare is rated Low

Analyzes and compares memory metrics without modifying data or executing code.

From the tool's definition Compare heap objects by shallow/retained size, class name, property count

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs v8_object_compare safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Jshookmcp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For v8_object_compare, this is the rule to start with:

v8_object_compare Allowed

v8_object_compare is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "v8_object_compare": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Jshookmcp, apply this rule, and every v8_object_compare call is checked against it from then on.

FAQ

Questions about v8_object_compare

What does the v8_object_compare tool do? +

Compare heap objects by shallow/retained size, class name, and property count. Same-snapshot mode (objectIds only) does all-pairs comparison (n-choose-2). Cross-snapshot mode (anotherSnapshotId + anotherObjectIds) does pairwise A[i]↔B[i] comparison. Use to track object growth over time, find memory regression candidates, or compare leaked vs healthy objects of the same class. It is categorised as a Read tool in the Jshookmcp MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on v8_object_compare? +

Register the Jshook MCP server in PolicyLayer and add a rule for v8_object_compare: 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 Jshookmcp. Nothing to install.

What risk level is v8_object_compare? +

v8_object_compare is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit v8_object_compare? +

Yes. Add a rate_limit block to the v8_object_compare 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 v8_object_compare completely? +

Set action: deny in the PolicyLayer policy for v8_object_compare. 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 v8_object_compare? +

v8_object_compare is provided by the Jshook MCP server (@jshookmcp/jshook). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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