Streaming Preview: - Real-time message preview during agent response (like "typing" indicator) - Supported on Telegram, Discord, and Feishu - Configurable interval, min delta chars, and max preview length Rate Limiting: - Per-session sliding-window rate limiter - Prevents users from flooding the bot with messages - Configurable max messages and window size Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>