AI agents call knowledge_recall to retrieve information from Loom 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 stored knowledge without creating, modifying, deleting, or executing any operations. It has no side effects on the knowledge store or external systems. The blast radius of misuse is minimal—an agent might retrieve sensitive information, but cannot alter or destroy it. Classified as Read with low severity.
From the tool's definition Tool description states "Search the knowledge store with LIKE matching" — a query operation with no modification or deletion capability. The verb "search" and the mechanism "LIKE matching" indicate data retrieval only.
Attacks that exploit this kind of access
Search the knowledge store with LIKE matching over title, body, and domain,. It is categorised as a Read tool in the Loom MCP Server, which means it retrieves data without modifying state.
Register the Loom MCP server in PolicyLayer and add a rule for knowledge_recall: 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 Loom. Nothing to install.
knowledge_recall 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 knowledge_recall 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 knowledge_recall. 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.
knowledge_recall is provided by the Loom MCP server (jbarket/loom). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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