dsh-plugin-undo

Rewinding a conversation in DeepSeek Harness usually comes with a catch: most rewind plugins rely on sessions.fork to copy the history prefix into a brand-new session, leaving your sidebar cluttered with duplicates and splitting the model context. dsh-plugin-undo takes a cleaner approach — undo in place.

The entire capability lives behind a single /undo command: /undo removes the last completed turn, /undo 3 removes the last three, and /undo all removes every turn currently visible to the model. After undo, the removed turns collapse into a compact header in the chat view; click it to expand or fold again. The raw session log stays append-only and is never rewritten. The session ID stays the same, there is no fork, no new session, and the model context is exactly the retained history.

Who is it for? If you iterate prompts and try-and-fail within a single session and do not want your sidebar buried under forked branches, this plug-in was built for that workflow. It touches no project files, leaves the underlying message structure intact, and operates only at the surface layer — lightweight and side-effect-free.