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play_audio

Play audio files in WAV or MP3 format using the ElevenLabs MCP Server's audio processing capabilities.

Instructions

Play an audio file. Supports WAV and MP3 formats.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
input_file_pathYes

Implementation Reference

  • The handler function for the 'play_audio' tool. It processes the input file path using handle_input_file, plays the audio using elevenlabs.play, and returns a success message with the file path.
    @mcp.tool(description="Play an audio file. Supports WAV and MP3 formats.")
    def play_audio(input_file_path: str) -> TextContent:
        file_path = handle_input_file(input_file_path)
        play(open(file_path, "rb").read(), use_ffmpeg=False)
        return TextContent(type="text", text=f"Successfully played audio file: {file_path}")
  • The @mcp.tool decorator registers the play_audio function as an MCP tool with its description.
    @mcp.tool(description="Play an audio file. Supports WAV and MP3 formats.")
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden of behavioral disclosure. It mentions supported formats (WAV and MP3) but lacks critical details such as whether playback is synchronous/asynchronous, if it requires specific permissions, potential side effects (e.g., audio output to device), or error handling. This leaves significant gaps for a tool that interacts with system resources.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is extremely concise with two sentences that directly address core functionality and format support. Every word earns its place, and it's front-loaded with the primary action. No unnecessary details or redundancy are present.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's complexity (interacting with audio playback, system resources) and lack of annotations or output schema, the description is insufficient. It misses behavioral traits, error conditions, output expectations, and deeper usage context. For a tool with potential side effects and no structured safety hints, this leaves the agent poorly informed.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The schema description coverage is 0%, with one parameter ('input_file_path') undocumented in the schema. The description adds minimal value by implying the parameter should point to an audio file, but doesn't specify path format, relative/absolute requirements, or file accessibility constraints. This partially compensates but remains inadequate for full parameter understanding.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action ('Play') and resource ('an audio file'), specifying the tool's purpose. It distinguishes from siblings like 'text_to_speech' or 'compose_music' by focusing on playback of existing files rather than generation or conversion. However, it doesn't explicitly differentiate from all audio-related siblings (e.g., 'isolate_audio'), keeping it from a perfect score.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives like 'text_to_speech' or 'speech_to_speech', nor does it mention prerequisites or exclusions. It only states what the tool does, leaving the agent to infer usage context from the tool name and sibling list.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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