pengyue-polaron/deepseek-harness-genui
Code-first React and TypeScript task apps rendered inline, in Canvas, full screen, or on localhost, with interaction state available to later agent turns and approval-gated MCP and API access.
Install
via npm
Resolves a published tarball rather than cloning the repository, and installs without any extra setup. Swap `web` for your profile name if you run another one.
via GitHub · npm package
Installing from GitHub runs the project's build script, which pnpm blocks until you allowlist it — run the command once and pnpm prints the exact key to add under `allowBuilds` in ~/.dsh/profiles/web/pnpm-workspace.yaml.
What happened when we ran it
Installed cleanly when we ran it
Every command here is run in a throwaway container against a clean profile, and the result is whatever the harness recorded — not a guess from the source. Last run 3d ago.
Due diligence
What it is — The DeepSeek Harness GenUI plugin allows the Agent to write a focused interface using React + TypeScript for the current task, saving interaction states for later agent turns.
Who it is for — The DeepSeek Harness GenUI plugin is suitable when the task requires making several connected choices. Tasks that only involve simple lists or plain questions can be handled without it because those can stay in prose.
Watch out — Real-world testing confirmed successful registration in a new profile. No obvious issues were found.
The verdict — I would install it because it enables later agent turns to read saved interaction states, allowing continuation without user repetition.
Generated by grok-4.6, and a starting point rather than a verdict. Where it says a plugin installs or does not, that is from a real run in a clean profile — everything else is read off the repository. Trust the source over this.
deepseek-harness-genui is a DeepSeek Harness plugin that lets an agent create task-specific React and TypeScript interfaces instead of expressing every task in prose. The Coding Agent writes ordinary React + TypeScript; the plugin builds and checks the result, then renders the app Inline, in Canvas, full screen, or through a localhost link. The app writes semantic task values such as selections, form answers, drafts, and progress, which later agent turns can read without asking the user to repeat them.
DeepSeek Harness GenUI also provides an approval boundary for connected access. An app declares the Harness, MCP, Skill tools or credential-free public HTTPS routes it needs; DeepSeek Harness presents the complete access list for a task-scoped decision, shows changed capabilities again, and blocks undeclared calls. MCP credentials do not enter generated code. The terminal profile is a terminal surface: it returns localhost app links rather than embedding Canvas, so the agent and user can continue through a CLI-led task.
This suits interactive planning, scientific explanations, code-path exploration, and other work involving connected choices or difficult relationships. It is the wrong choice for plain questions, rewriting, summaries, and simple lists that are clearer in prose. It also requires Node.js ^22.19.0 || >=24, DeepSeek Harness ^0.1.0-rc.6, and Playwright Chromium for the Web profile.
DeepSeek Harness provides the plugin configuration under Settings → Plugins → Plugin configuration. New apps can use automatic design selection, one of the built-in profiles, or an imported custom DESIGN.md. The selected design becomes the default for later apps; existing apps retain their original design. DESIGN.md controls the visual language, not the page structure. The documented built-in profiles are:
editorial-workbench for reading, planning, forms, and content-heavy workledger-grid for comparisons, schedules, evidence, and shortlistsfield-atlas for scientific, causal, and spatial explanationskinetic-signal for changing data, connected tools, and user-triggered actionsDeepSeek Harness starts the Web profile with dsh --profile web. This profile supports Inline, Canvas, fullscreen, and localhost links. The terminal profile uses dsh --profile tui; it returns localhost links and does not embed Canvas. MCP servers must be connected to the same profile. The repository's source-development commands are pnpm run typecheck, pnpm test, and pnpm run package:plugin.
The plugin stores an app's selections and inputs in the current task. Inline, Canvas, fullscreen, and CLI/localhost are surfaces over that same task state, so a later agent turn can read values saved in another surface. Later edits update the same app, while a failed update leaves the current working version in place.
For connected apps, the app declares the Harness/MCP/Skill tools or credential-free public HTTPS routes it needs. DeepSeek Harness shows the complete access list before the task-scoped decision, repeats changed capabilities, and blocks undeclared calls. In Web, access can be reviewed or revoked from the app card.
The plugin requires Node.js ^22.19.0 || >=24 and supports DeepSeek Harness ^0.1.0-rc.6. Generated code runs in a sandbox. Direct API requests are limited to declared, credential-free public HTTPS routes. Temporary links and grants expire after 7 days; saved task state expires 7 days after its last update.
Written from the project's own documentation and kept in sync with it. Where the two disagree, the source is authoritative — read the README on GitHub
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