Dataset: 2026-10-27-catalog-ai-v2
Ruleset: b2e8889c66f7
Scanned: 2026-10-27
Window: February–September 15, 2026

Catalog tracking observation. This repository is measured with the same fixed window and ruleset, but it is not part of the published benchmark or its aggregate claims.

Fast, Declarative, Reproducible, and Composable Developer Environments using Nix

01Result

cachix/devenv ↗

cachix/devenv AI coding statistics: 33.7%

of 1,579 commits in February–September 15, 2026 were committed by an AI agent — a floor, not an estimate

33.7% agent · top contributor 91.5%19 contributors

individual

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

532

agent commits

1,047

other considered commits

agent contributors

91.5%

largest contributor

02Drivers

What shapes this result

Mode, timing, and detected signatures show whether the result reflects broad adoption or one concentrated workflow.

Assisted or autonomous

532assisted

0autonomous

Assisted — a developer’s identity authored the commit and the agent added itself as co-author. Autonomous — a bot identity authored the commit without a human identity attached.

Agent share by month

Peak month: 50%. Bars are scaled to that peak, not to 100%.

Which agents

Agent	Vendor	Commits	Share
Claude Code	Anthropic	527	33.4%
Cursor Agent	Anysphere	4	0.3%
GitHub Copilot	GitHub	1	0.1%

03Evidence

Inspect the matches

Public commit samples let you inspect the signatures behind the aggregate result.

Matched commit samples

3ff8ef4d on GitHubNext release is 2.3.2Claude Code
2418e1b4 on GitHubRelease 2.3.1Claude Code
d335aa7e on GitHubdocs: explain trusted-users for cachix.pull on multi-user Nix (#3177)Claude Code
44836a1f on GitHubfix(console): honor showOutput under Quiet (#3146)Cursor Agent
f0d2e283 on GitHubfix(tasks): run start.enable=false processes pulled in as @completed deps Cursor Agent
38c15877 on GitHubfix: stream task lifecycle under quiet --no-tui (#3145)Cursor Agent
6a7d8fd9 on GitHubadopt shared website features (#3162)GitHub Copilot

04Method

What entered the denominator

The result begins with commit history, removes merges and routine automation, and reports literal agent signatures as a lower bound.

Exclusion ledger

Commits in window	2,040
Merge commits removed	−256
CI / dependency bots removed	−205
Considered	1,579

Bots are excluded from the denominator entirely. Agent attribution requires a literal supported signature; no code-style inference is used.

Continue exploring

Claude Code commitsBrowse repositories with detected Claude Code signatures →GitHub Copilot commitsBrowse repositories with detected GitHub Copilot signatures →Cursor Agent commitsBrowse repositories with detected Cursor Agent signatures →Rust AI coding statisticsCompare evidence across Rust repositories →GitHub AI commit analyzerInspect another repository with the same evidence model →

Reproduce this observation

Run the same detector locally.

Deterministic signature matching; no code-style inference. Squash merges can remove trailers, so this result remains a measured floor.

npx qmmit-cli cachix/devenv

Scan another repository

Try

Month	Agent share	Considered commits
2026-02	48.3%	373
2026-03	42%	371
2026-04	29.2%	185
2026-05	21.6%	190
2026-06	50%	58
2026-07	21.6%	162
2026-08	10.7%	177
2026-09	28.6%	63