26 tools with consistent verb-noun naming (auth_*, get_*, send_*, etc.). All tools have descriptions (10-200 chars, within baseline). Input schemas present with type definitions for all parameters. However, output schemas are NOT documented, critical gap for LLM planning. Parameter descriptions are minimal (avg 40-60 chars vs baseline 72). No enum constraints on categorical parameters (e.g., auth state values). Error handling guidance absent. Security concerns: auth credentials exposed as parameters (auth_set_parameters takes api_id/api_hash directly). No idempotency hints on destructive ops (delete_messages, forward_messages). Tool composition is reasonable (separate auth steps, distinct read/write ops), but multi-step auth flow lacks recovery guidance.

• Document output schemas for all tools. For get_user, specify: {user_id: integer, first_name: string, last_name: string, username: string, phone: string}. This enables LLMs to chain tools correctly.
• Move api_id and api_hash to server-side environment variables (TELEGRAM_API_ID, TELEGRAM_API_HASH). Remove them from auth_set_parameters parameters. Inject them server-side during TDLibClient initialization.
• Add error recovery guidance to auth_* tools. E.g., auth_send_code description: 'If verification fails, call auth_status to check state, then retry with correct code or call auth_run to restart.'
• Add idempotency hints and confirmation patterns. For delete_messages, add a 'dry_run' boolean parameter (default false) to preview deletions. For forward_messages, document that repeated calls with same message_ids are safe (idempotent).
• Constrain categorical parameters with enums. For auth_run, document valid state values: 'waitingForPhoneNumber | waitingForCode | waitingForPassword | ready'. For auth_status, return state as enum in output schema.