take_heapsnapshot

THE RISK

Low Risk

Why take_heapsnapshot needs a policy

The tool reads/captures memory state of a page for analysis purposes. It does not modify, execute, or delete anything. However, heap snapshots can expose sensitive data (credentials, tokens, PII) held in memory, making the severity medium despite being a read operation.

From the tool's definition Capture a heap snapshot... analyze the memory distribution of JavaScript objects and debug memory leaks

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

POLICY

How to control take_heapsnapshot

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

policy.json

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

take_heapsnapshot 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 Chrome DevTools — 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 →

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EXPLORE

Related tools and policies

More Chrome DevTools tools

Destructive uninstall_extension Uninstalls a Chrome extension by its ID. Destructive close_heapsnapshot Closes a previously loaded memory heapsnapshot, freeing its memory. Destructive close_page Closes the page by its index. The last open page cannot be closed. Execute emulate Emulates various features on the selected page. Execute execute_3p_developer_tool Executes a tool exposed by the page. Execute execute_webmcp_tool Executes a WebMCP tool exposed by the page. Execute lighthouse_audit Get Lighthouse score and reports for accessibility, SEO, best practices, and agentic brows Execute navigate Loads a URL

All 50 Chrome DevTools tools →

Read tools on other servers

M-Team MCP Server get_torrent_detail YouTube MCP Server search_channel Android Forensics ADB MCP Server parse_browser_history 0xarchive web3_challenge

Go deeper

Roll out MCP under one policy → Per-person scoped tokens, one central policy, and full audit across every server your team connects.
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 →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about take_heapsnapshot

What does the take_heapsnapshot tool do? +

Capture a heap snapshot of the currently selected page. Use to analyze the memory distribution of JavaScript objects and debug memory leaks. 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 take_heapsnapshot? +

Register the Chrome DevTools MCP server in PolicyLayer and add a rule for take_heapsnapshot: 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 take_heapsnapshot? +

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

Can I rate-limit take_heapsnapshot? +

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

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

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

Enforce policy on every Chrome DevTools tool call.

Start from Chrome DevTools, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →