Play an audio file using the system's default audio player with optional volume control and file cleanup. Supports WAV and MP3 formats. Files must be in the temporary directory for security.
Part of the Local Voice server.
Free to start. No card required.
AI agents call play_audio to perform operations in Local Voice. While the risk category is not fully classified, applying a rate limit gives you visibility into how often the tool is called and prevents unexpected bursts of activity from autonomous agents.
Applying a policy to play_audio gives you an audit trail of every call an AI agent makes. Even for low-risk tools, visibility into agent behaviour helps you debug issues, optimise workflows, and maintain compliance with your organisation's security requirements.
Apply a rate limit to control usage and monitor for unexpected behaviour.
{
"version": "1",
"default": "deny",
"tools": {
"play_audio": {
"limits": [
{
"counter": "play_audio_rate",
"window": "minute",
"max": 60,
"scope": "grant"
}
]
}
}
}See the full Local Voice policy for all 3 tools.
These attack patterns abuse exactly the kind of access play_audio gives an agent. Each links to the full case and the policy that stops it:
Other other tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Play an audio file using the system's default audio player with optional volume control and file cleanup. Supports WAV and MP3 formats. Files must be in the temporary directory for security.. It is categorised as a Other tool in the Local Voice MCP Server, which means it performs auxiliary operations.
Register the Local Voice MCP server in PolicyLayer and add a rule for play_audio: 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 Local Voice. Nothing to install.
play_audio is a Other tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the play_audio 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.
Set action: deny in the PolicyLayer policy for play_audio. 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.
play_audio is provided by the Local Voice MCP server (@codecraftersllc/local-voice-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 3 Local Voice tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.