AI agents call list_folders to retrieve information from Sifter without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool simply queries and returns metadata about existing folders. It retrieves information without modifying, creating, or deleting any data. The read-only nature and minimal information exposure (folder names and document counts) present negligible risk to a system.
From the tool's definition Tool name 'list_folders' and description 'List folders with their name and document count' indicate a retrieval operation with no side effects. No mutation, deletion, or code execution is involved.
Documented attack patterns abuse exactly the kind of access list_folders gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Sifter, and nothing reaches the server without passing your rules. This is the rule we recommend for list_folders:
{
"version": "1",
"default": "deny",
"tools": {
"list_folders": {}
}
}list_folders is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List folders with their name and document count. It is categorised as a Read tool in the Sifter MCP Server, which means it retrieves data without modifying state.
Register the Sifter MCP server in PolicyLayer and add a rule for list_folders: 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 Sifter. Nothing to install.
list_folders 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_folders 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_folders. 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_folders is provided by the Sifter MCP server (sifter-ai/sifter). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 15 Sifter tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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15 Sifter tools catalogued and risk-classified — across an index of 42,500+ MCP servers.