msgmcp exposes 9 tools with basic naming and descriptions, but lacks critical depth. All tools have names starting with action verbs (get_, list_, read_, send_, search_) and descriptions present (avg ~80 chars). However, parameter descriptions are sparse or missing entirely. Input schemas are visible but incomplete: most parameters lack type constraints, enums, or validation guidance. Output schemas are undocumented, LLMs cannot predict what fields to expect. Error handling is absent from visible code. The send-message tool is destructive but has no confirmation pattern. Overall, this is a functional but immature tool set that would require significant hardening before production use.

• Document output schemas for all 9 tools. Specify field names, types, and whether results are paginated. Example: 'Returns array of {id: string, sender: string, text: string, timestamp: ISO8601, attachments: [{type, url}]}'.
• Add confirmation/dry-run to send-message. Require explicit 'confirm: true' parameter or implement a two-step pattern (preview → send) to prevent accidental message dispatch.
• Expand parameter descriptions with format guidance and constraints. E.g., 'chat_identifier: Phone number (e.g., +1234567890) or email address. Required.' and 'limit: Max results to return (1 - 100, default 20).'
• Implement pagination with cursor or offset+limit for list-conversations, get-attachments, get-tapbacks, and unread-messages. Return total_count and next_cursor in responses.
• Add error handling documentation. Specify what errors each tool can raise (e.g., 'chat not found', 'invalid phone number') and recovery guidance for LLMs (e.g., 'Try list-conversations to find valid identifiers').