@deepseek-ai/dsh-client-ui-side-chat

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Formal Web client plugin for Side Chat. It occupies the single conversation.chat.branch-action seat rendered after the finalized assistant action strip. The conversation owner supplies a guarded fork(): Promise<SessionId> callback for the assistant tail, so transcript-prefix eligibility and child-title policy stay in ui-conversation; this plugin owns the branch button, pending/error presentation, and the handoff to layout.openSideChat(childId).

The addressed-Session lease, second authorized conversation occurrence, and mutually exclusive right-column geometry remain framework support in runtime, web-react, ui-layout, and ui-conversation. Removing this package from the Web composition removes the branch action without weakening those foundations or deleting existing child Sessions.

The /client public entry exports only the Cordis plugin body (apply and inject).

Install into DeepSeek Harness

This repository contains the plugin package plus an integration patch. The patch adds the addressed-Session, right-column, conversation Slot, Web composition, tests, and generated-catalog changes required by this plugin; stock 0.1.0-rc.6 does not expose that complete foundation.

The patch is verified against upstream commit 47f943859bef60e4160492346772ded9b24f765a:

git clone https://github.com/deepseek-ai/deepseek-harness.git
cd deepseek-harness
git checkout 47f943859bef60e4160492346772ded9b24f765a
git submodule add https://github.com/Rookiecom/dsh-client-ui-side-chat.git packages/client/ui-side-chat
./packages/client/ui-side-chat/integration/install.sh
pnpm install
pnpm --filter @deepseek-ai/dsh-client-ui-side-chat bundle

The installer applies integration/deepseek-harness-side-chat.patch without staging or committing Harness files. For a newer Harness revision, first try git apply --3way packages/client/ui-side-chat/integration/deepseek-harness-side-chat.patch and resolve any upstream contract changes before building.

Model Experience

None, as this browser-side branching control registers no prompt, tool, or model-visible context.

KV Cache effect

The plugin adds no tokens and changes no cache policy. Any prefix reuse comes from the ordinary forked Session and selected model provider.

Known Limitations and Deferred Work

• Completed assistant tails only — user messages, streaming turns, and assistant messages followed by later Chat nodes expose no usable branch action.
• One auxiliary column — Side Chat occupies the existing right column instead of coexisting with Tool details; narrow viewport concession may reduce that column to zero width.
• Rename failure after creation — the current sessions.fork({ increaseTitle: true }) contract rejects when post-create title incrementing fails, so the durable child can exist without opening in Side Chat.