How much of GitHub's most-starred AI tooling is written by coding agents?

An analysis of the full git history of 52 of GitHub's most-starred AI-tooling repositories, covering 324,088 commits, finds that in the median repo 16.9% of commits in its last 180 days of activity carry an AI signature, and 21 of 52 sit at 25% or more. Stars and AI-signed share show no detectable link (Spearman ρ = -0.05, p = 0.72), and 85.3% of the 36,892 signed commits come from Claude, whose tool adds a trailer by default. The author cautions that heavy AI use is concentrated in projects started in 2025 or later, so the sample cannot separate AI use from recency, and every AI percentage is a lower bound.