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. Delete
one from its row, or clear a project's — or the workspace's — from the …
menu.
- 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
- Open a git project (accept the
dt init prompt if it appears).
- Click the DT Duet icon in the activity bar.
- 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.
- 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.
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