dsh-turn-delete

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Delete one complete closed turn from a DeepSeek Harness conversation without deleting or replacing the Session. The action appears beside the final assistant response for each completed top-level turn.

Install

From GitHub:

dsh plugin --profile web add github:hanshenmesen/dsh-turn-delete

From a prebuilt GitHub Release:

dsh plugin --profile web add https://github.com/hanshenmesen/dsh-turn-delete/releases/latest/download/dsh-turn-delete.tgz

Restart dsh web after installation. To remove it:

dsh plugin --profile web remove dsh-turn-delete

Behavior

• A trash action appears only on completed ordinary Session turns. Subagent transcripts do not expose it.
• Deletion requires confirmation and is disabled while the Session is running.
• The prompt, assistant messages, and tool records for the selected turn are removed from the Session's current model surface.
• The Session id, title, workspace association, later turns, and original append-only event log remain intact.
• A durable zero-content replacement event records the deletion. Reloading the page or restarting the profile preserves it.
• Repeating the same request is idempotent.

The plugin refuses deletion when the target turn is still open or has already been merged into a compaction replacement with other history. This prevents deleting only part of model-visible context.

Design

The Host half registers POST /dsh-turn-delete, claims the target Agent's maintenance lease, validates the complete closed-turn surface span, appends a zero-content replacement, and waits for sessions.flush() before acknowledging success.

The browser half contributes to the public conversation.chat.assistant-actions and conversation.chat.turnTail slots. A Conversation definition projects the durable tombstone onto the target Turn. DeepSeek Harness does not yet expose a public whole-Turn visibility hook, so the tail contribution applies a narrow presentation compatibility layer to the Chat rows between adjacent Turn tails. Model context deletion does not depend on that compatibility layer.

Compatibility

• DeepSeek Harness 0.1.0-rc.6 and 0.1.0-rc.7
• Node.js 22.19 or newer
• Web profile and Web-based desktop shells

DeepSeek Harness is in developer preview. After upgrading Harness, verify the plugin once with a disposable Session containing three short turns and delete the middle one.

Development

npm install
npm run check
dsh plugin --profile web add -w link:/absolute/path/to/dsh-turn-delete

npm run check type-checks and builds both plugin halves, runs the unit/UI tests, and verifies the npm package contents.

Security

Like every DSH plugin, this package runs with the Harness process's permissions. Review the source before installing third-party plugins. The deletion changes future model context but deliberately retains the original append-only events for audit and replay.

License

MIT