23.2%

of 3,794 commits were committed by an AI agent — a floor, not an estimate

23.2% agent · top contributor 38.5%93 contributors

org-wide

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

879

agent commits

2,915

human commits

agent contributors

38.5%

largest contributor

Assisted or autonomous

872assisted

7autonomous

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: 50.3%. Bars are scaled to that peak, not to 100%.

Which agents

Claude Code	Anthropic	523	13.8%
GitHub Copilot	GitHub	143	3.8%
Cursor Agent	Anysphere	119	3.1%
OpenAI Codex	OpenAI	102	2.7%

Verify it yourself

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

57760086docs: add v1.55.0 release notes (#35682)Claude Code
0ae92296fix(signals-backend): correct HTTP error responses in WebSocket upgrade haClaude Code
fe6ace67fix(backend-defaults,search): resolve account-specific AWS credentials in Claude Code
1b998611Add `templateFilter` field to `sub-page:scaffolder/templates` (#34624)GitHub Copilot
23705f31fix(integration): url-encode the branch ref in Bitbucket Server fetch URLsGitHub Copilot
c498fc7ffeat(docs): add Mermaid diagram support (#35064)GitHub Copilot
cd4a9c7efeat(notifications): add unread notifications home card and NFS widget (#3Cursor Agent
600f8b50fix(scaffolder): address remaining task recovery feedbackCursor Agent
3af4ef99chore: remove legacy @backstage/codemods package (#35013)Cursor Agent
7535616cfix(search): bind PostgreSQL headline options (#35702)OpenAI Codex
727d53f3perf(catalog): yield during entity field projection (#35709)OpenAI Codex
ed9034cafix: align Cloudflare Access token verificationOpenAI Codex

What was excluded

Commits in window	5,773
Merge commits removed	−1,440
CI / dependency bots removed	−539
Considered	3,794

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 backstage/backstage

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