Claude-to-IM is a host-agnostic bridge library that connects Anthropic’s Claude Code SDK to instant messaging platforms. It handles message routing, streaming previews, permission approval flows, Markdown rendering, chunking, and rate limiting across Telegram, Discord, and Feishu/Lark. The library delegates LLM calls and persistence to the host application through dependency injection interfaces, making it embeddable in any application that wants to expose Claude Code interactions through chat platforms.