Get service worker registrations and their state (see browser_docs)
AI agents call browser_storage_get_service_workers to retrieve information from Browser MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries the state of service worker registrations in the browser. It performs a read-only operation that does not modify data, execute arbitrary code, delete resources, or commit financial transactions.
From the tool's definition The tool name is 'browser_storage_get_service_workers' and the description states 'Get service worker registrations and their state', which indicates retrieval of state information without modification or side effects.
Attacks that exploit this kind of access
Get service worker registrations and their state (see browser_docs). It is categorised as a Read tool in the Browser MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Browser MCP Server MCP server in PolicyLayer and add a rule for browser_storage_get_service_workers: 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 Browser MCP Server. Nothing to install.
browser_storage_get_service_workers is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the browser_storage_get_service_workers 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.
Set action: deny in the PolicyLayer policy for browser_storage_get_service_workers. 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.
browser_storage_get_service_workers is provided by the Browser MCP Server MCP server (madebytokens/browser-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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