AI agents call query_sift 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 retrieves or searches data from already-extracted records using natural language queries. It has no side effects—it does not create, modify, delete, or execute external operations. The sibling tools (create_sift, delete_sift, aggregate_sift) handle mutations; this tool is explicitly a query operation, fitting squarely in the Read category.
From the tool's definition Tool description states: 'Run a natural language query over a sift's extracted records.' The verb 'query' and 'run...over' indicate read-only retrieval of data without modification. No language suggests mutation, deletion, or execution of arbitrary code.
Documented attack patterns abuse exactly the kind of access query_sift 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 query_sift:
{
"version": "1",
"default": "deny",
"tools": {
"query_sift": {}
}
}query_sift is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Run a natural language query over a sift's extracted records. 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 query_sift: 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.
query_sift 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 query_sift 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 query_sift. 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.
query_sift 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.