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Foundry376/Mailspring ↗
48.2%
of 411 commits were committed by an AI agent — a floor, not an estimate
48.2% agent · top contributor 87.9%8 contributors
individual

One person is driving this. The headline number reflects a single contributor's workflow, not a project-wide shift.

198
agent commits
213
human commits
8
agent contributors
87.9%
largest contributor

Assisted or autonomous

198assisted
0autonomous

Assisted — a developer’s identity authored the commit and the agent added itself as co-author. The agent ran git commit during a working session, with a person there. Autonomous — a bot identity is the author, no human in the loop. Across the whole index, 93.7% of agent commits are assisted.

Agent share by month

Feb26
Mar26
Apr26
May26
Jun26
Jul26
Aug26
Sep26

Peak month: 67.2%. Bars are scaled to that peak, not to 100%.

Which agents

Claude CodeAnthropic19848.2%

Verify it yourself

Sample commits that matched. Every one links to GitHub — check the trailers.

  • 9a0ba872Group the folder context menu with separatorsClaude Code
  • 26d667d8Wire Mark All as Read through the callback itself, keep unread-count defauClaude Code
  • 45554aa2Resolve keymaps base → template → package so templates can't clobber plugiClaude Code

What was excluded

Commits in window411
Merge commits removed−0
CI / dependency bots removed−0
Considered411

Bots are excluded from the denominator entirely. Counting dependabot as “AI-written code” is the fastest way to produce a meaningless number.

How this was measured

Measured over February–August 2026, cloned directly. Detection is deterministic string matching against signatures agents write about themselves — no heuristics, no style analysis. Merge commits and CI bots are excluded from the denominator. The figure is a floor: squash merges strip trailers, so real usage is higher. Contributor counts are aggregate — no individual is named.

Run it yourself: npx qmmit-cli Foundry376/Mailspring

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