lan-im

Running multiple DeepSeek Harness instances on the same LAN? Out of the box they are isolated from each other, with no built-in messaging channel. lan-im turns every instance into a discoverable, account-based peer, giving your local Harness fleet a lightweight, real-time chat and file-sharing backbone without any public relay.

The feature set covers the full delivery pipeline. Discovery works over two channels - mDNS multicast plus a UDP broadcast fallback - so nodes are found even in networks that block multicast. Private messages carry delivery acknowledgements and a persisted offline outbox; anything queued while the recipient is down is delivered automatically the moment they come back online. Channels come in public and private flavours, with private ones supporting member invite and removal. Every channel includes a shared file space with on-demand fetch, local caching, and owner-controlled deletion. All real-time traffic rides over native WebSocket, and desktop notifications plus an unread badge catch you when the window is closed.

If your office, home lab, or small studio runs several Harness instances and you need low-latency prompt sharing, result hand-off, or file exchange without a third-party IM, lan-im is the zero-dependency, plug-and-play option. Keep in mind it transmits in plaintext and is intended for trusted local networks only.