SmileAPI MCP exposes 5 messaging tools with complete JSON schemas and basic descriptions. However, naming violates verb_noun conventions (envia_texto instead of send_text), descriptions lack context on when/why to use each tool, and parameter descriptions are minimal. No output schemas documented. Error handling is present but generic. Tool definitions are explicitly registered in TOOL_DEFINITIONS array with proper inputSchema, but lack depth expected of production tools.

• Rename tools to English verb_noun convention: envia_texto → send_text, envia_imagem → send_image, envia_video → send_video, envia_audio → send_audio, envia_documento → send_document. This enables LLMs to parse intent from the name alone.
• Expand tool descriptions to 100-200 chars explaining WHEN to use each tool. E.g., send_text: 'Send a text message via WhatsApp. Use for simple text-only messages. For media, use send_image, send_video, send_audio, or send_document instead.'
• Document output schema for each tool. Add a 'returns' section describing the response structure: { message_id: string, status: 'sent'|'pending'|'failed', timestamp: ISO8601, recipient: string }.
• Add format constraints to 'to' parameter: 'Phone number with country code and area code (format: 55 + 2-digit area + 8-9 digit number, e.g., 5543996611437). Must be 11-13 digits total.'
• Enhance error handling with recovery guidance. Catch SmileAPI errors and return: { error: 'Invalid recipient number', suggestion: 'Ensure phone number includes country code (55) and area code (2 digits).' } or { error: 'Rate limited', suggestion: 'Wait 60 seconds before retrying.' }