DT Duet — AI Pair Programming

One model writes, another reviews — in a loop, until both approve.

DT Duet runs duetcode inside VS Code: Claude implements your task, Gemini reviews the diff against your tests and linters, and you watch both sides of the conversation live.

Features

• Duet panel — per round, the writer's stream (tool actions, code, explanation) stacks above the reviewer's block (check results, review, verdict with blockers), each full-width.
• Go/no-go card on pull request reviews — name a GitHub pull request URL in the task and the answer opens with ✓ GO or ✕ NO-GO, blocker and warning counts, and one plain sentence per finding, above the full analysis.
• Sessions sidebar — every past run from .duet/sessions, with outcome icons; click to replay any session round by round, patches included.
• Stop, without losing the room — a running task can be stopped from the sidebar toolbar, and + refuses to discard one that is still going.
• Task composer — type a task, toggle auto (models loop unattended until mutual approval) or plan (plan → review → approve → execute).
• Screenshots — attach with the picker or paste directly with Cmd+V; pasted images are cleaned up after the task.
• Approvals as buttons — when a model needs your call (review now? fix issues? guidance when the models deadlock), it's a click, not a terminal prompt.
• Secure keys — API keys live in your OS keychain via VS Code SecretStorage and are injected only into the spawned dt process. Claude CLI users need no Anthropic key at all.

Requirements

• The dt binary, at the version matching this extension — the CLI and the extension share a version number and are released together:

  cargo install --git https://github.com/harsha509/duetcode --tag <version> --force
  

  Take the newest tag from the releases page. --force is what makes an upgrade actually replace an older dt. Set dt.binaryPath if it is not on VS Code's PATH, e.g. ~/.cargo/bin/dt.

• A git repository — the extension offers to run dt init for you the first time you start a task in a project that is not set up yet.

• Gemini API key — add it via the ⚙ gear (stored in the keychain) or export GEMINI_API_KEY.

• Claude CLI authenticated (claude → /login), or an Anthropic API key.

Quick start

1. Open a git project (accept the dt init prompt if it appears).
2. Click the DT Duet icon in the activity bar.
3. Hit + (New Task), type what you want, press Enter. + starts a fresh session: it closes the open panel and clears both models' context, so nothing from the previous task carries over. With a task still running it declines and offers to stop that task first.
4. Watch Claude write and Gemini review; answer prompts with the buttons.

Settings live behind the ⚙ gear (sidebar title or panel): API keys, Claude CLI login, binary path, writer model.

Security

• Keys: OS keychain only — never settings.json, never synced, never logged.
• dt.binaryPath is machine-scoped, so a cloned repo's workspace settings cannot redirect the extension to an untrusted binary.
• The extension talks to dt serve over stdio only; no network ports.
• Model providers (Anthropic, Google) receive your diffs and prompts, as with any AI coding tool.

Development

cd editors/vscode
npm install
npm run compile   # or press F5 for an Extension Development Host

The extension is a thin client over dt serve's JSON-lines protocol — see src/serve.rs in the repo root. Releasing: see RELEASING.md.