pcg_pipeline · Loenn MCP: Risk & Policy

WHAT IT DOES

What pcg_pipeline does on Loenn

AI agents invoke pcg_pipeline to trigger actions in Loenn. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why pcg_pipeline needs a policy

The name 'pcg_pipeline' strongly suggests a procedural content generation pipeline, which would execute a multi-step generation process to create or modify map data. Given the server's stated capability of procedural generation, this likely triggers complex operations with significant side effects on map files. However, the empty description lowers confidence — it could be Read or Write in nature.

From the tool's definition Tool name 'pcg_pipeline' on a server that 'procedurally generate' Celeste .bin map files; description is empty.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

pcg_pipeline Rate-limited

pcg_pipeline stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "pcg_pipeline": {
      "limits": [
        {
          "counter": "pcg_pipeline_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about pcg_pipeline

What does the pcg_pipeline tool do? +

pcg_pipeline. It is categorised as a Execute tool in the Loenn MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on pcg_pipeline? +

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

What risk level is pcg_pipeline? +

pcg_pipeline is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit pcg_pipeline? +

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

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

pcg_pipeline is provided by the Loenn MCP server (magedeline/loenn-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.