Pulse
2026-09-18-v3.0
Dataset
2026-09-18-v3.0
Ruleset
b2e8889c66f7
Scanned
2026-09-16
Window
February–September 15, 2026
Local to this browser

01Result

vitest-dev/vitest ↗

vitest-dev/vitest AI coding statistics: 16.5%

of 691 commits in February–September 15, 2026 were committed by an AI agent — a floor, not an estimate
16.5% agent · top contributor 74.6%20 contributors
team

A small group is using agents. Adoption has spread beyond one person but is not project-wide.

114
agent commits
577
other considered commits
20
agent contributors
74.6%
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

114assisted
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. Across the whole index, 96% of agent commits are assisted.

Agent share by month

Agent-attributed commit share by month
MonthAgent shareConsidered commits
2026-029.8%102
2026-0317.9%106
2026-0424.4%90
2026-0528.3%106
2026-0621.2%66
2026-074.6%65
2026-085.3%113
2026-0923.3%43

Peak month: 28.3%. Bars are scaled to that peak, not to 100%.

Which agents

AgentVendorCommitsShare
OpenAI CodexOpenAI649.3%
Claude CodeAnthropic466.7%
GitHub CopilotGitHub121.7%
Cursor AgentAnysphere10.1%

03Evidence

Inspect the matches

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

Matched commit samples

  • cbbea0b7 on GitHubdocs: fix internal links to config options (#11240)OpenAI Codex
  • a47d7908 on GitHubfix(fakeTimers): force `queueMicrotask` and `nextTick` in `toNotFake` (#11OpenAI Codex
  • 05982297 on GitHubfix(ui): fix explorer file summary count (#11125)OpenAI Codex
  • f08ce4b7 on GitHubfix: apply queued mocks from doMock() in queue order (fixes #10706) (#1112Claude Code
  • 1e9f80ec on GitHubperf(vm): don't prewarm modules the worker never requests (#11033)Claude Code
  • c3ba16b3 on GitHubfix(vm): fall back to compiling from source when a module's code cache is Claude Code
  • 613c7706 on GitHubchore: remove direct `esbuild` devDependency (#10849)GitHub Copilot
  • 3d421d4e on GitHubchore: setup PR-driven release pipeline (#10550)GitHub Copilot
  • 62756547 on GitHubfix: fix mixed stdout/stderr log timestamps in `onUserConsoleLog` (#10308)GitHub Copilot
  • 209b1b0e on GitHubfeat(ui): add duration sorting to explorer (#9603)Cursor Agent

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 window743
Merge commits removed−0
CI / dependency bots removed−52
Considered691

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

05Provenance

Pinned to a source state

This observation names the repository state, release, and detector that produced it. Use these identifiers when reproducing or citing the result.

Dataset release
2026-09-18-v3.0
Scan date
2026-09-16
Ruleset
sha256:b2e8889c66f72c18a61839f0bf1a9f77b5481ba2def044dba33c797b2f2bdcae
Canonical repository
vitest-dev/vitest
Default branch
main
Resolved HEAD
0780a8e5b7967a4168173599e9c74fb79aab2483 ↗
Resolved
2026-09-16
Measurement window
February–September 15, 2026
Download observation JSONDeterministic export · same values as this page

06Peer context

Position among comparable repositories

The cohort uses the same release and measurement window, then narrows to the repository’s ecosystem and removes low-activity observations.

CohortJS/TS · 376 eligible repositories · at least 100 considered commits2026-09-18-v3.0 · February–September 15, 2026 · 194 of 570 ecosystem repositories excluded
Agent-commit share position74th percentile

Midrank percentile; equal shares split the tied positions.

Repository
16.5%
Cohort median
5.4%
Share rank
100 / 376
0th50th100th

Percentile = (repositories below + half of 1 tied repository) ÷ 376.

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 →OpenAI Codex commitsBrowse repositories with detected OpenAI Codex signatures →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 vitest-dev/vitest

Scan another repository

Try