list_extensions

What list_extensions does on Chrome Devtools

AI agents call list_extensions 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.

Why list_extensions is rated Low

This tool retrieves browser extension metadata without modifying or executing anything. While it is a Read category tool by primary function, the severity is elevated to medium because the list of installed extensions can reveal sensitive information about the user's security posture, privacy tools, banking extensions, or other extensions that indicate vulnerabilities or high-value targets for an attacker.

From the tool's definition Tool description states it 'Lists all the Chrome extensions installed in the browser' with name, ID, version, and enabled status. The verb 'lists' and action of retrieving extension information without modification indicates a read operation.

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

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

Questions about list_extensions