12 tools with complete input schemas and descriptions present. Naming follows verb_noun convention (search_, list_, get_, send_, download_). However, descriptions are generic and lack LLM-optimization guidance. Parameter descriptions exist but are minimal (avg ~40 chars, below 72-char baseline). No output schemas documented. No error handling guidance. No tool annotations (readOnlyHint/destructiveHint). Missing idempotency guidance for write operations. Tool composition is reasonable (separate send_message, send_file, send_audio_message) but could benefit from batch variants.

• Document output schemas for all 12 tools. Specify returned fields (e.g., search_contacts returns [{contact_id, name, phone_number, last_message_date}]). This enables LLMs to chain tools correctly.
• Add tool annotations: mark send_message, send_file, send_audio_message as destructiveHint=true and idempotentHint=false (or true if WhatsApp deduplicates by message ID). Mark all read tools with readOnlyHint=true.
• Expand descriptions to 100-150 chars with WHEN guidance. E.g., 'Get chat metadata by JID. Use this when you have a JID; use get_direct_chat_by_contact() if you only have a phone number.'
• Add error recovery hints to descriptions. E.g., send_message: 'If recipient not found, call search_contacts() first to verify the phone number or JID format.'
• Create send_messages (plural) accepting {recipients: [{phone_number|jid}], message: string} to enable batch sends in one call, reducing token waste and latency.