59.6%

of 3,664 commits were committed by an AI agent — a floor, not an estimate

59.6% agent · top contributor 8.8%322 contributors

org-wide

Adoption is broad. Many contributors are committing agent-authored work, which is what a real organisational rollout looks like.

2,182

agent commits

1,482

human commits

322

agent contributors

8.8%

largest contributor

Assisted or autonomous

2182assisted

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

Jan26

Feb26

Mar26

Apr26

May26

Jun26

Jul26

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

Which agents

Claude Code	Anthropic	2166	59.1%
GitHub Copilot	GitHub	14	0.4%
OpenAI Codex	OpenAI	2	0.1%

Verify it yourself

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

e01f892dfix: snapshot tmux process traversal (gt-4398fx)Claude Code
376b8267fix(dolt): re-enable non-blocking auto_gc to bound sql-server RSSClaude Code
0b0259fffix(done): route source validation and runtime cleanupClaude Code
3f6ad39bfix: restrict unsigned binary check to macOS only (#3561)GitHub Copilot
25db7294feat(config): add list subcommand to default-agentGitHub Copilot
54c43ba2docs: add GitHub Copilot CLI as supported agent providerGitHub Copilot
9b1c3ef3feat(plans): enrich codex-hooks specOpenAI Codex
c42daccffeat(plans): draft codex-hooks specOpenAI Codex

What was excluded

Commits in window	4,622
Merge commits removed	−914
CI / dependency bots removed	−44
Considered	3,664

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 gastownhall/gastown

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