WhatsApp MCP server has 12 tools with complete input schemas and descriptions, but quality is uneven. All tools have descriptions (10-200 chars, baseline 194), and parameters include types and descriptions. However, descriptions are often generic or lack actionable context for LLM selection. No output schemas are documented. Error handling is absent, no recovery guidance, no categorization of retryable vs fatal errors. Security concerns: send_message and send_file are destructive operations with no confirmation pattern. Naming is clear (verb_noun convention), but composition could be tighter, send_message, send_file, and send_audio_message are three separate tools doing similar work.

• Document output schemas for all 12 tools. Specify field names, types, and whether results are paginated. Example: list_messages returns {messages: [{id, sender, content, timestamp}], total_count, has_more}.
• Add confirmation pattern to send_message, send_file, send_audio_message. Implement a dry-run mode or require explicit user approval before sending.
• Add error handling guidance to all tools. Specify which errors are retryable (network timeout, rate limit) vs user-fixable (invalid phone number, chat not found) vs fatal (permission denied).
• Consolidate send_message, send_file, send_audio_message into a single send_message tool with optional media_path and media_type parameters. Simplifies LLM reasoning and reduces tool count.
• Enhance descriptions for send_* tools to clarify when to use each variant and what happens on failure. Example: 'Send a text message to a contact or group. For media, use media_path parameter. Returns message_id on success or error details on failure.'