Dev builds SkillBill, a Kotlin orchestrator that turns a Linear ticket into a merged PR
Sermilion · reddit · 2026-09-21
Reddit developer Sermilion, tired of prompt-driven "skills" tools like Superpowers that never get triggered, built his own open-source Kotlin orchestrator called SkillBill that breaks AI-driven development into 7 phases:
- Pre-planning (repo/history/requirement gathering)
- Planning
- Implementation
- Audit (checks code against every acceptance criterion, sends back if missing)
- Code review and fixes
- Validations (linters, formatters, tests)
- PR
Key design: execution state is persisted in a local DB, and a Kotlin runtime — not model instructions — controls phase transitions and verifies required outputs before advancing, avoiding token overuse and context pollution. Extras include parallel planning per subtask, project-specific memory, two code-review modes (standard and multi-agent), and stack-specific "platform-packs".
Results: he ran a 20-subtask repo-wide refactor for 20 hours unattended; over 6 months of use, QA returns nearly vanished, PR review comments dropped to 0-1, and colleagues adopted it too. MIT-licensed at skillbill.dev, with IntelliJ and VS Code monitoring plugins; he's now experimenting with CodeGraph and Jev integration.
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