List localStorage/sessionStorage keys for the current origin with pagination and truncated value previews.
AI agents call interceptor_browser_list_storage_keys to retrieve information from Proxy without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays metadata about browser storage (keys and preview values) for the current origin. It performs no modifications, deletions, code execution, or side effects — purely informational querying of already-accessible client-side storage.
From the tool's definition Tool description states it 'List[s] localStorage/sessionStorage keys' with 'value previews' — a retrieval operation that queries stored data without modifying, deleting, or executing operations.
Documented attack patterns abuse exactly the kind of access interceptor_browser_list_storage_keys gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Proxy, and nothing reaches the server without passing your rules. This is the rule we recommend for interceptor_browser_list_storage_keys:
{
"version": "1",
"default": "deny",
"tools": {
"interceptor_browser_list_storage_keys": {}
}
}interceptor_browser_list_storage_keys is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List localStorage/sessionStorage keys for the current origin with pagination and truncated value previews. It is categorised as a Read tool in the Proxy MCP Server, which means it retrieves data without modifying state.
Register the Proxy MCP server in PolicyLayer and add a rule for interceptor_browser_list_storage_keys: 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 Proxy. Nothing to install.
interceptor_browser_list_storage_keys 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 interceptor_browser_list_storage_keys 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 interceptor_browser_list_storage_keys. 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.
interceptor_browser_list_storage_keys is provided by the Proxy MCP server (yfe404/proxy-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Proxy, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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89 Proxy tools catalogued and risk-classified — across an index of 43,000+ MCP servers.