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wsapi-chat

WSAPI WhatsApp MCP Server

by wsapi-chat

whatsapp_download_media

Download WhatsApp media files using the media ID from incoming message events.

Instructions

Download media by ID. Use the media.id field from incoming message events.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
idYesMedia ID from a received message event
Behavior2/5

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

No annotations provided, so description must disclose behavioral traits. It only states 'download', implying a read operation, but does not explicitly confirm safety (read-only, no side effects). Lacks details on authentication or rate limits.

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?

Two sentences, no wasted words. Front-loaded action verb and clear parameter source.

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

Completeness4/5

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

For a simple 1-param tool with no output schema, the description adequately explains usage. Could mention the output type (binary) but not critical given the action.

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

Parameters4/5

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

Schema coverage is 100%, but description adds value by specifying 'media.id from incoming message events' beyond the schema's generic description. This aids correct invocation.

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?

Clearly states 'Download media by ID' with a specific verb and resource. Distinguishes itself from siblings by its unique action.

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

Usage Guidelines4/5

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

Specifies to use the media.id field from incoming message events, providing clear context. No explicit alternatives or when-not-to-use, but the purpose is straightforward.

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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