compare_heapsnapshots

Loads two memory heapsnapshots and returns the comparison. If classIndex is provided, returns detailed diff for that class, otherwise returns summary diff.

SERVERChrome Devtools SOURCE@async23/chrome-devtools-mcp

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/async23-chrome-devtools-mcp/compare-heapsnapshots.md

WHAT IT DOES

What compare_heapsnapshots does on Chrome Devtools

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

RISK

Why compare_heapsnapshots is rated Low

Tool reads and analyzes existing heap snapshots without modifying browser state or data.

From the tool's definition Loads two memory heapsnapshots and returns the comparison.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs compare_heapsnapshots safely

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

compare_heapsnapshots Allowed

compare_heapsnapshots 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": {
    "compare_heapsnapshots": {}
  }
}

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

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

FAQ

Questions about compare_heapsnapshots

What does the compare_heapsnapshots tool do? +

Loads two memory heapsnapshots and returns the comparison. If classIndex is provided, returns detailed diff for that class, otherwise returns summary diff. It is categorised as a Read tool in the Chrome Devtools MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on compare_heapsnapshots? +

Register the Chrome Devtools MCP server in PolicyLayer and add a rule for compare_heapsnapshots: 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 Chrome Devtools. Nothing to install.

What risk level is compare_heapsnapshots? +

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

Can I rate-limit compare_heapsnapshots? +

Yes. Add a rate_limit block to the compare_heapsnapshots 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_heapsnapshots completely? +

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

compare_heapsnapshots is provided by the Chrome Devtools MCP server (@async23/chrome-devtools-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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