List all FileSearch stores with document counts and sizes.
AI agents call list_file_stores to retrieve information from Gpal without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves metadata about existing file stores (counts and sizes) but does not modify, delete, or execute any operations. It is purely informational, making it a Read category risk with low severity since it only exposes store metadata without direct code execution or data modification capability.
From the tool's definition Tool name is 'list_file_stores' and description states it 'List[s] all FileSearch stores with document counts and sizes' — this is a retrieval/query operation with no side effects.
Documented attack patterns abuse exactly the kind of access list_file_stores gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Gpal, and nothing reaches the server without passing your rules. This is the rule we recommend for list_file_stores:
{
"version": "1",
"default": "deny",
"tools": {
"list_file_stores": {}
}
}list_file_stores is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all FileSearch stores with document counts and sizes. It is categorised as a Read tool in the Gpal MCP Server, which means it retrieves data without modifying state.
Register the Gpal MCP server in PolicyLayer and add a rule for list_file_stores: 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 Gpal. Nothing to install.
list_file_stores 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 list_file_stores 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 list_file_stores. 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.
list_file_stores is provided by the Gpal MCP server (tobert/gpal). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Gpal, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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19 Gpal tools catalogued and risk-classified — across an index of 43,000+ MCP servers.