Duo Loop — Vulgr Docs

Duo Loop runs two agents in two real terminals side by side, and you watch every step live. Start it from Duo Loop in the sidebar, or press Ctrl+Shift+S.

Duo Loop setup dialog — Describe the goal, pick the Writer and Checker agents, set the number of rounds.

How it works

LiveSquadModal.tsx

The screen splits into two terminals: left pane Writer, right pane Checker.
If you didn’t give a verify command, the Checker first writes unit tests for your goal and reports the test command on a TEST_COMMAND: line (testPlan.ts).
The Writer writes code until the tests pass.
The Checker runs the tests and reads the git diff, then approves (APPROVED) or sends feedback.

Flow

You→ CheckerSends the goal: “Add CSV export to the reports page”

Checker→ CheckerWrites tests for the goal, reports TEST_COMMAND

↺ loop · up to N rounds (e.g. 3)

Checker→ WriterHands over the test plan and requirements

Writer→ WriterWrites / updates the code

Writer→ TestsRuns the test command

✕ tests fail

Tests→ WriterError output (compressed by ContextOptimizer)

✓ tests pass

Tests→ CheckerReview the git diff

Checker→ WriterFeedback or APPROVED