hanshenmesen / dsh-turn-delete

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.

Demo

Delete the middle turn after confirmation while keeping the same Session and its later turn. This was recorded through the real DeepSeek model flow on DeepSeek Harness 0.1.0-rc.7.

Install

From npm (recommended):

dsh plugin --profile web add dsh-turn-delete

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