This server has critical definition gaps. 7 of 9 tools lack documented input schemas in the visible code (only send_message, send_image, send_file show inline parameter descriptions). Descriptions are present but generic (avg ~60 chars, below the 194-char baseline). No output schemas documented. No error handling guidance. Tool names are reasonable (verb_noun pattern) but parameter descriptions are minimal. The configure tool has no parameters documented despite being a critical setup step. Missing idempotency guidance for write operations.

• Document output schemas for all tools. E.g., list_allowed_users should return {users: [{user_id: string, display_name: string, added_at: ISO8601}], total: number}. This enables LLMs to chain calls and extract required fields.
• Add input schemas to configure, get_pairing_code, and list_allowed_users. Even if they take no parameters, declare inputs: {} explicitly in the tool definition.
• Expand parameter descriptions to 50 - 150 chars. Include format hints, constraints, and examples of valid values. E.g., 'user_id: WeChat user ID in format [email protected] or display name (e.g., "Alice"). If you only have a name, call list_allowed_users() first to find the ID.'
• Add error handling guidance to send_* and download_attachment tools. E.g., 'If the call fails with "context_token expired", the session has ended, ask the user to re-authenticate via configure().'
• Implement a dry-run or confirmation pattern for destructive operations (remove_user, approve_pairing). E.g., add a confirm_remove_user tool that returns a confirmation_id, then require that ID in remove_user to prevent accidental deletions.