get_heapsnapshot_retainers

Loads a memory heapsnapshot and returns retainers for a specific node ID.

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/get-heapsnapshot-retainers.md

WHAT IT DOES

What get_heapsnapshot_retainers does on Chrome Devtools

AI agents call get_heapsnapshot_retainers 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 get_heapsnapshot_retainers is rated Low

This tool retrieves and queries memory diagnostic information from a Chrome browser heapsnapshot without creating, modifying, or deleting any data. It is a read-only inspection capability used for debugging and performance analysis, with minimal blast radius if misused (information disclosure only).

From the tool's definition Tool name includes 'get_' prefix and description states it 'loads' and 'returns' data (heapsnapshot retainers). No modification, deletion, or execution of external operations occurs—purely data retrieval from an already-captured memory snapshot.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs get_heapsnapshot_retainers 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 get_heapsnapshot_retainers, this is the rule to start with:

get_heapsnapshot_retainers Allowed

get_heapsnapshot_retainers 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": {
    "get_heapsnapshot_retainers": {}
  }
}

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 get_heapsnapshot_retainers call is checked against it from then on.

FAQ

Questions about get_heapsnapshot_retainers

What does the get_heapsnapshot_retainers tool do? +

Loads a memory heapsnapshot and returns retainers for a specific node ID. 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 get_heapsnapshot_retainers? +

Register the Chrome Devtools MCP server in PolicyLayer and add a rule for get_heapsnapshot_retainers: 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 get_heapsnapshot_retainers? +

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

Can I rate-limit get_heapsnapshot_retainers? +

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

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

get_heapsnapshot_retainers 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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