54 tools with highly inconsistent quality. 13 tools (find_messages, get_chat_history, get_group_info, get_group_resolved_participants, get_settings, list_groups, mark_as_read, send_text, send_media, send_audio, send_sticker, send_location, send_contact) have NO visible descriptions in the provided source, these score 0 on description. Tools with descriptions (accept_invite, archive_chat, check_number, connection_state, create_group, delete_message, download_media, fetch_business_profile, fetch_invite_code, fetch_privacy, fetch_profile_picture, find_chats, find_contacts) show moderate quality: descriptions range 50 - 200 chars, input schemas present with typed parameters. However, output schemas are not documented anywhere in the source code. Error handling is absent, no recovery guidance, no categorization of retryable vs fatal errors. No tool annotations (readOnlyHint, destructiveHint, idempotentHint) despite clear risk classifications (READ_ONLY, WRITE, DESTRUCTIVE). Naming is verb-first and clear (send_text, update_profile_name, delete_message), following pattern:tool conventions. Parameter descriptions exist for documented tools but are sparse (e.g., 'Array of phone numbers' lacks format/length constraints). No pagination guidance visible despite tools like find_chats and find_contacts accepting limit/offset. Overall: ~24% of tools lack descriptions entirely; output schemas undocumented; error handling missing; tool annotations absent.

• Add descriptions to all 41 undocumented tools. Each description should be 50 - 200 chars, state WHAT the tool does, WHEN to use it, and any prerequisites. Example: 'Send a text message to a WhatsApp chat. Returns message_id for later reference (e.g., deletion, reactions).'
• Document output schemas for all tools. Include field names, types, and whether fields are always present or conditional. Example for send_text: { message_id: string, timestamp: number, status: 'pending'|'sent'|'failed' }.
• Add tool annotations to all tools. Use readOnlyHint: true for READ_ONLY tools (check_number, fetch_privacy, list_groups), destructiveHint: true for DESTRUCTIVE tools (delete_message, logout_instance), and idempotentHint: true for idempotent operations (mark_as_read, update_profile_name).
• Add error handling guidance to destructive tools. For delete_message and logout_instance, document what errors can occur (e.g., 'Message not found', 'Already logged out'), whether they are retryable, and what the LLM should do next. Consider a dry-run or confirmation pattern for irreversible operations.
• Enhance parameter descriptions with format constraints. For phone numbers, specify 'E.164 format (e.g., 5511999999999)'. For JIDs, specify 'Format: <number>@s.whatsapp.net (individual) or <number>@g.us (group)'. For enums, use JSON Schema enum instead of free-form strings.