generate_drums · Filopastry MCP: Risk & Policy

WHAT IT DOES

What generate_drums does on Filopastry

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

WHY IT NEEDS A POLICY

Why generate_drums needs a policy

This tool creates new drum patterns in the music environment. While it modifies the composition state, the effects are reversible (patterns can be deleted, replaced, or undone), and there is no execution of arbitrary code, data deletion, or financial impact. It falls squarely into the Write category as a creative/compositional operation that produces new data artifacts.

From the tool's definition Tool name 'generate_drums' with description 'Generate drum pattern' indicates creation of new musical content (a drum pattern). The verb 'generate' is constructive and creates new data that can be modified or discarded.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

generate_drums Rate-limited

generate_drums 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": {
    "generate_drums": {
      "limits": [
        {
          "counter": "generate_drums_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 Filopastry, so you can run agents against it safely.

FAQ

Questions about generate_drums

What does the generate_drums tool do? +

Generate drum pattern. It is categorised as a Write tool in the Filopastry MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on generate_drums? +

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

What risk level is generate_drums? +

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

Can I rate-limit generate_drums? +

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

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

generate_drums is provided by the Filopastry MCP server (youwenshao/filopastry). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.