Feature: Harness Studio

Purpose

The prompt studio is a local tool. This feature puts it one action away inside the DeepSeek Harness: a client plugin adds a Krank action to the conversation session header, and the action opens the local studio.

The plugin is a host, not a second copy of the studio: it embeds the standalone renderer in a full-viewport dialog, keeps the iframe mounted when hidden, and offers a new-tab fallback. The studio keeps its own state, downloads, and diff view. The plugin is installed into the user’s Harness web profile; it is never published to npm.

Requirements

• HARNESS-STUDIO-R001 — The plugin must be a package under sources/harness/krank-studio/, declaring dsh.bundle.patch and dsh.client.inject.
• HARNESS-STUDIO-R002 — Its client entry must register into conversation.session.header.actions and open http://127.0.0.1:8090/browser/index.html, the address make studio serves, in an embedded dialog with a new-tab fallback.
• HARNESS-STUDIO-R003 — The host half must be empty: the plugin adds no service and holds no credential.
• HARNESS-STUDIO-R004 — The package must not be in the npm package’s files list, and the plugin must not be published.
• HARNESS-STUDIO-R005 — The README must give install, reload, and remove commands, including a fallback launcher path when dsh is not on PATH.
• HARNESS-STUDIO-R006 — The action’s visible label must be Krank, so the header names the tool rather than the page it opens.
• HARNESS-STUDIO-R007 — The embedded panel must be a modal dialog with an iframe titled Krank prompt studio, Close control, Escape dismissal, and focus returned to the header action; closing must hide rather than unmount the iframe so page-local studio state survives reopening.
• HARNESS-STUDIO-R008 — scripts/harness-panel-check.mjs must mount the action in a running Harness page and verify the dialog, iframe source, iframe retention across close/reopen, and Escape dismissal, because the installed DSH package offers no Vitest component environment.

Behavior

• make studio serves the studio; the plugin’s action opens it.
• dsh plugin --profile web add -w sources/harness/krank-studio installs the bundle; the profile’s dsh.profile.bundles gains dsh-krank-studio.
• Reloading the Harness page shows the Krank action in the session header; it opens the panel over the conversation.
• Escape or Close hides the panel; reopening preserves the studio page state. Open in new tab remains available.

Dependencies

• 04-browser-demo.md — the local studio the action opens.