Listen for user speech and return the transcribed text.
AI agents call listen to retrieve information from Pipecat MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool captures audio input and transcribes it to text. It is a read/query operation — it retrieves data (the user's spoken words as text) without modifying any state or triggering external side effects. The main concern is microphone access and potential eavesdropping, but functionally it is a read operation.
From the tool's definition Listen for user speech and return the transcribed text
Documented attack patterns abuse exactly the kind of access listen gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Pipecat MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for listen:
{
"version": "1",
"default": "deny",
"tools": {
"listen": {}
}
}listen is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Listen for user speech and return the transcribed text. It is categorised as a Read tool in the Pipecat MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Pipecat MCP Server MCP server in PolicyLayer and add a rule for listen: 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 Pipecat MCP Server. Nothing to install.
listen is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the listen 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 listen. 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.
listen is provided by the Pipecat MCP Server MCP server (pipecat-ai/pipecat-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 7 Pipecat MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
7 Pipecat MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.