Zero manual code: spec-first development in action with Claude Code

A developer built an open-source agent named Agent Smith and a spec-first development plugin to generate 500k lines of code and 10,000 tests entirely via AI with zero manual coding. This approach achieves multi-agent parallel development using YAML specs, isolated Git worktrees, and strict quality cards.

Reddit r/ClaudeCode/u/holgerleichsenring

Claude CodeAgent Smith

Added 2026-10-31 · originally published 2026-10-27

Steps

1Create a YAML spec file with a fixed schema in the repository, including goals, steps, and a definition of done, with states cycling among planned, active, and done.
2Write decision records to a separate decision file so subsequent agents can read previously built content and the reasoning behind it.
3Before writing code, use a script to check whether all files and lines referenced in the spec exist, then have a second agent review the spec to yield a review result of BUILD, BUILD WITH CUTS, or REFUSE.
4Assign an independent git worktree to each spec so multiple agents can run in parallel overnight without interfering with one another.
5Configure a commit hook to run the full test suite on every spec commit, blocking the commit if any tests fail.

Copy-ready prompt

Based on the following YAML spec file [YAML file path] and decision file [decision file path], accomplish the goal while following the definition of done. First verify via script that all referenced files and lines exist, then begin writing code and ensure all tests pass.

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#AI Coding#Agent Practice#Automated Development#Claude

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Summarized by AI from the original source - refer to the original post for details. Copyright belongs to the original author.

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