Tack Harness: A Lean Framework for Disciplined, Agent-Driven Software Development

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Tack Harness is a minimalist workflow framework aimed at reducing tooling complexity and keeping AI coding assistants reliable across large codebases. Its design rests on five principles, known as the FETID pillars: fixable, extensible, traceable, isolated, and distilled. Development is modeled as a deterministic finite state machine with five states: development, testing, bugfix, merge-conflict, and branch-op. The framework also treats AI agents as specialized collaborators governed by an AGENTS.md file that defines project context. The approach is presented as a way to prevent premature merges, sloppy testing, and orphaned branches.

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