brief_add_callout · Llama MCP: Risk & Policy

WHAT IT DOES

What brief_add_callout does on Llama

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

WHY IT NEEDS A POLICY

Why brief_add_callout needs a policy

The tool adds content to a brief rather than executing arbitrary code or deleting data. While it modifies a deal brief (potentially important business context), the operation is reversible and limited in scope. Medium severity reflects that misuse could inject misleading information into deal briefs, but the blast radius is contained to brief content modifications rather than system-wide or financial impact.

From the tool's definition Tool description states 'Prepend a callout block to a deal brief', which creates or modifies data by adding a block to an existing brief.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

brief_add_callout Rate-limited

brief_add_callout 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": {
    "brief_add_callout": {
      "limits": [
        {
          "counter": "brief_add_callout_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 Llama, so you can run agents against it safely.

FAQ

Questions about brief_add_callout

What does the brief_add_callout tool do? +

Prepend a callout block to a deal brief. Use for emphasized insights or warnings. It is categorised as a Write tool in the Llama MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on brief_add_callout? +

Register the Llama MCP server in PolicyLayer and add a rule for brief_add_callout: 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 Llama. Nothing to install.

What risk level is brief_add_callout? +

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

Can I rate-limit brief_add_callout? +

Yes. Add a rate_limit block to the brief_add_callout 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 brief_add_callout completely? +

Set action: deny in the PolicyLayer policy for brief_add_callout. 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 brief_add_callout? +

brief_add_callout is provided by the Llama MCP server (llama-ventures/llama-cli). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.