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Evolution API MCP Server

by serversmx

evolution_message_send_audio

Send WhatsApp voice or audio messages (PTT) using a URL or base64-encoded data. Specify recipient and optionally quote a previous message, add mentions, or set a delay.

Instructions

Send a WhatsApp voice/audio message (PTT) by URL or base64.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
audioYesAudio URL or base64.
delayNoDelay in milliseconds before sending.
numberYesRecipient phone number (digits, country code) or full WhatsApp JID.
quotedNoMessage to quote/reply to.
instanceNoWhatsApp instance name. Optional if EVOLUTION_DEFAULT_INSTANCE is configured.
mentionedNoList of JIDs to mention, e.g. ['5215550123@s.whatsapp.net'].
mentionsEveryOneNoMention all group participants.
Behavior2/5

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

No annotations are provided, so the description carries full burden for behavioral disclosure. It only mentions the input format (URL or base64), but omits details about file size limits, format support, idempotency, error handling, or rate limits. This is insufficient for a mutation tool with nested parameters.

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 a single, front-loaded sentence with no wasted words. It efficiently conveys the essential action and input method, earning its place without redundancy.

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?

Despite a clear purpose, the description fails to cover important aspects like the 'quoted' parameter (nested object for replying), 'delay', 'mentioned', and 'mentionsEveryOne'. With no output schema and a moderately complex input schema, the description is not complete enough to guide an agent effectively.

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 input schema has 100% description coverage, so the baseline is 3. The description adds the context that the audio is a 'voice/audio message (PTT)', which complements the schema descriptions but does not significantly enhance parameter understanding beyond what the schema already provides.

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

Purpose5/5

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

The description clearly states the action ('Send'), the resource ('WhatsApp voice/audio message (PTT)'), and the method ('by URL or base64'). With sibling tools like send_text, send_media, and send_sticker, this description effectively distinguishes the tool's specific purpose.

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 explicit guidance on when to use this tool vs. alternatives, nor does it mention prerequisites or when not to use it. While the sibling list implies differentiation, the description itself offers no usage context.

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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