Usage

Edit a user message — open the Turn Fork tab, pick a message, correct the text, choose the downstream policy and save. A new branch session is created from the completed prefix and the corrected turn re-runs.
Retry / regenerate — per-turn buttons in the tab, per-message buttons on assistant replies, or the header regenerate button for the latest reply.
Version tree — the tab lists every branch with its operation summary (from "…" to "…"), marks the current version, and offers Undo/Redo navigation plus Open for any branch. Branches with a running agent show a warning and a Stop control.
Cascade policy — truncate drops everything after the edited turn; preserve replays the edited turn and every later turn (each replayed input becomes its own turn, with inputs of the same original turn kept in order). The editor shows how many turns preserve will replay before you confirm.

dsh-turn-fork