Delta installs into any repo as a git submodule and runs nightly via GitHub Actions — a PR lands in your inbox each morning.
Reads your product vision, principles, and completed feature history from .delta/config.yml. Ranks the backlog by user value and writes a tight feature brief with acceptance criteria.
Reads the brief, explores your codebase to understand existing patterns, then implements the feature using TDD — failing tests first, then minimal code to pass. One atomic commit.
The feature branch is pushed and a pull request is opened with the full brief as the description. Review it, check the preview, merge or close. Delta runs again tomorrow.
# 1. Add Delta as a submodule git submodule add https://github.com/derrybirkett/delta delta bash delta/install.sh # 2. Describe your product $EDITOR .delta/config.yml # 3. Add your Anthropic API key to GitHub repo secrets # Settings → Secrets → ANTHROPIC_API_KEY # 4. Commit and push — the daily cycle fires at 2am UTC git add .delta/ .github/ Makefile .gitmodules git commit -m "chore: install delta" git push
Everything Delta needs to know lives in .delta/config.yml in your repo.