knowledge_verify · Loom MCP: Risk & Policy

WHAT IT DOES

What knowledge_verify does on Loom

AI agents use knowledge_verify to create or update resources in Loom — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Loom environment.

WHY IT NEEDS A POLICY

Why knowledge_verify needs a policy

This tool modifies metadata on a knowledge page (sets verified_at timestamp) without altering the page content. It is a reversible write operation with limited blast radius — it only changes a verification timestamp, not the underlying data.

From the tool's definition Stamp a knowledge page as verified WITHOUT touching its body — sets verified_at

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

knowledge_verify Rate-limited

knowledge_verify stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "knowledge_verify": {
      "limits": [
        {
          "counter": "knowledge_verify_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Loom, so you can run agents against it safely.

FAQ

Questions about knowledge_verify

What does the knowledge_verify tool do? +

Stamp a knowledge page as verified WITHOUT touching its body — sets verified_at. It is categorised as a Write tool in the Loom MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on knowledge_verify? +

Register the Loom MCP server in PolicyLayer and add a rule for knowledge_verify: 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.

What risk level is knowledge_verify? +

knowledge_verify is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit knowledge_verify? +

Yes. Add a rate_limit block to the knowledge_verify 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.

How do I block knowledge_verify completely? +

Set action: deny in the PolicyLayer policy for knowledge_verify. 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.

What MCP server provides knowledge_verify? +

knowledge_verify 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.