add_to_playlist · Xiaozhi MCP: Risk & Policy

WHAT IT DOES

What add_to_playlist does on Xiaozhi

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

WHY IT NEEDS A POLICY

Why add_to_playlist needs a policy

This tool creates or appends entries to a playlist, which is a reversible modification of data. It does not execute arbitrary code, delete data irreversibly, move money, or have destructive side effects. The change can be undone by removing the entry. Severity is low because the blast radius is limited to playlist state with no external system impact.

From the tool's definition Tool name 'add_to_playlist' and description '将歌曲添加到播放列表' (add song to playlist) indicates modification of a playlist data structure through creation/addition of entries.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_to_playlist Rate-limited

add_to_playlist 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": {
    "add_to_playlist": {
      "limits": [
        {
          "counter": "add_to_playlist_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 Xiaozhi, so you can run agents against it safely.

FAQ

Questions about add_to_playlist

What does the add_to_playlist tool do? +

将歌曲添加到播放列表。. It is categorised as a Write tool in the Xiaozhi MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_to_playlist? +

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

What risk level is add_to_playlist? +

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

Can I rate-limit add_to_playlist? +

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

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

add_to_playlist is provided by the Xiaozhi MCP server (zhouhaojiang/xiaozhi-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.