dsh-session-messaging

Local, cross-session messaging for DeepSeek Harness.

DSH Bridge is the local messaging foundation of the DSH family. It lets live sessions in one DSH host discover one another and exchange messages. It has no Web UI and no network transport.

dsh-weave can extend Bridge across machines; dsh-chat can present its messages as a human-facing group chat. Neither is required for local use.

The plugin exposes the ctx.dshBridge service and registers session_list, session_send, and session_messages for agents. The old ctx.sessionMessaging accessor remains as a temporary compatibility alias.

ctx.dshBridge.deliverExternal() is the controlled inbound seam for a trusted transport such as Weave: it emits the same session follow-up and audit record as local delivery, rather than letting a transport manipulate agents directly. Delivery uses the public ctx.agents registry and Agent.followup(). An idle target is woken, a running target receives ordinary queued work, and a persisted offline target is resumed through DSH's configured Host agent resolver before delivery. Concurrent messages to the same cold session share one resume operation. The resolver reconstructs the recorded agent preset and model selection exactly as the Web host does. A bounded in-memory recent log (the latest 1,000 delivered messages) is kept only for session_messages replay and diagnostics; it is not a second delivery queue. Messages carry sender, target, UUID, and timestamp metadata.

This package intentionally does not implement cross-host transport. dsh-weave will provide the authenticated network backend while preserving the local message semantics.

Install

dsh plugin --profile web add dsh-bridge@next

Known Limitations and Deferred Work

• Process boundary — sessions in another process or host are not visible; add an authenticated relay/backend before advertising cross-host delivery.
• In-memory retention — messages are lost when the plugin process exits and older than the latest 1,000 are evicted; durable inbox/outbox persistence is still deferred until a cross-process relay needs it.
• Delivery acknowledgement — the current result means the target was live (or successfully resumed) and accepted the follow-up call, not that the target model processed it.

Model Experience

None, as session_list, session_send, and session_messages expose their schemas directly through the tool registry.

KV Cache effect

Independent tool schemas; sending a message changes only the target session's queued input and does not alter the sender's cached prompt prefix.