export_lyrics · Mr Magic MCP: Risk & Policy

WHAT IT DOES

What export_lyrics does on Mr Magic

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

WHY IT NEEDS A POLICY

Why export_lyrics needs a policy

The tool creates or modifies files on disk by exporting lyrics in various formats. This is reversible (files can be deleted or overwritten), so it is classified as Write rather than Destructive. Severity is medium because uncontrolled file writes could fill disk space or overwrite user files, but the impact is localized to the filesystem and recoverable.

From the tool's definition Tool performs 'save' operation to disk with multiple file format options (plain/LRC/SRT). Description explicitly states 'save...to disk', which is a write operation that creates or modifies files.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

export_lyrics Rate-limited

export_lyrics 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": {
    "export_lyrics": {
      "limits": [
        {
          "counter": "export_lyrics_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 Mr Magic, so you can run agents against it safely.

FAQ

Questions about export_lyrics

What does the export_lyrics tool do? +

Find lyrics and save plain/LRC/SRT plus romanized variants to disk, or resolve an exact provider reference from MCP search tools. It is categorised as a Write tool in the Mr Magic MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on export_lyrics? +

Register the Mr Magic MCP server in PolicyLayer and add a rule for export_lyrics: 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 Mr Magic. Nothing to install.

What risk level is export_lyrics? +

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

Can I rate-limit export_lyrics? +

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

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

export_lyrics is provided by the Mr Magic MCP server (mr-magic-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.