update_audio_metadata

THE RISK

Medium Risk

Why update_audio_metadata needs a policy

This tool modifies existing audio file metadata (label, description, voice reference), which is a classic Write operation: the changes are reversible and have no side effects beyond updating stored attributes.

From the tool's definition Tool description states 'Update metadata for an audio file' — metadata updates are reversible modifications that create or change data attributes (label, description, voice reference info) without destructive or execute-level impact.

Documented attack patterns abuse exactly the kind of access update_audio_metadata gives an agent:

POLICY

How to control update_audio_metadata

PolicyLayer is an MCP gateway — it sits between your AI agents and DMCP, and nothing reaches the server without passing your rules. This is the rule we recommend for update_audio_metadata:

policy.json

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

update_audio_metadata 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.

Create a free account and register DMCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about update_audio_metadata

What does the update_audio_metadata tool do? +

Update metadata for an audio file (label, description, voice reference info). It is categorised as a Write tool in the DMCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_audio_metadata? +

Register the D MCP server in PolicyLayer and add a rule for update_audio_metadata: 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 DMCP. Nothing to install.

What risk level is update_audio_metadata? +

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

Can I rate-limit update_audio_metadata? +

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

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

update_audio_metadata is provided by the D MCP server (shawnrushefsky/dmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every DMCP tool call.

Start from DMCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →