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AIWerk

@aiwerk/mcp-server-elevenlabs

by AIWerk

post_agent_hold_audio_route

Sets the audio file played on loop to callers waiting in an agent's concurrency queue. Use to provide custom hold music or messages.

Instructions

Post Agent Hold Audio

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
agent_idYesThe id of an agent. This is returned on agent creation.
hold_audio_file_pathNoAn MP3 or WAV file played on loop to callers waiting in the agent's concurrency wait queue. Maximum size 40 MB, maximum duration 180 seconds. Local path. Required for this call.
hold_audio_file_base64NoBase64 contents for "hold_audio_file". Use this when the server cannot read your local disk.
hold_audio_file_filenameNoFilename to send for "hold_audio_file". Some endpoints infer the audio format from it.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

D1.9/5.0
Behavior2/5

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

Annotations declare readOnlyHint=false, idempotentHint=false, openWorldHint=true and destructiveHint=false, so the write/side-effect profile is covered by structured data. The description adds nothing about behavior — not what is replaced, whether the previous audio is discarded, auth needs, or size/duration constraints — so beyond the annotations it contributes no context.

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

Conciseness2/5

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

The text is short, but that brevity reflects under-specification rather than efficient front-loading. There is no informational content to front-load, so it reads as a bare title rather than a working description.

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

Completeness1/5

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

For a non-idempotent, non-destructive write tool with four parameters and no output schema, the description provides nothing an agent needs: no statement of what is being set, whether it replaces existing hold audio, or what a successful call produces.

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?

Schema description coverage is 100%, so all four parameters (agent_id, hold_audio_file_path, base64, filename) are already fully documented with constraints such as 40 MB / 180 s limits and the base64 fallback. Per the baseline rule for high coverage, a 3 is appropriate even though the description adds no parameter information.

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

Purpose2/5

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

The description 'Post Agent Hold Audio' merely rephrases the tool name 'post_agent_hold_audio_route' without adding a verb+resource that clarifies what actually happens (e.g. setting/uploading an agent's hold audio file). It is essentially a tautology, and it gives no hint of how it differs from siblings like post_agent_avatar_route or delete_agent_hold_audio_route.

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

Usage Guidelines1/5

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

There is no guidance on when to use this tool, when not to, or which alternatives exist. The sibling list contains several closely related audio/agent routes, and nothing here routes the agent to the right one.

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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