AI agents call browser_storage_get_cache_storage to retrieve information from Browser 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 cached data without creating, modifying, or deleting any entries. It is purely informational, fitting the Read category. Severity is low because cache storage typically contains non-sensitive application data, and unauthorized read access has minimal impact compared to other tool risks on the browser automation server.
From the tool's definition Tool lists Cache Storage API caches and their entries; 'list' and 'get' operations are read-only with no modifications or side effects.
Attacks that exploit this kind of access
List Cache Storage API caches and their entries (see browser_docs). It is categorised as a Read tool in the Browser MCP Server, which means it retrieves data without modifying state.
Register the Browser MCP server in PolicyLayer and add a rule for browser_storage_get_cache_storage: 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. Nothing to install.
browser_storage_get_cache_storage 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_cache_storage 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_cache_storage. 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_cache_storage is provided by the Browser MCP server (ricardodeazambuja/browser-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
browser_storage_get_cache_storage is one line of Browser's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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