83.3% of 281 open-source AI contribution policies permit AI code, but 67.3% demand a high level of human involvement

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A study of 281 AI contribution policies in popular open source projects, a governance artifact that barely existed months ago, plus 92 dedicated policy files tracked over time, found permission is the norm: 83.3% permit or encourage AI in code contributions, while 67.3% require a high level of human involvement and 43.4% explicitly assign accountability. AI disclosure is required by 48.8%, most often in pull request descriptions and commit messages, but what must be disclosed varies widely. The authors also catalog ten distinct countermeasures against AI slop, which is the practical reference if you are writing or complying with one of these policies.