Dataset: 2026-09-18-v3.0
Ruleset: b2e8889c66f7
Scanned: 2026-09-16
Window: February–September 15, 2026

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01Result

dotnet/runtime ↗

dotnet/runtime AI coding statistics: 52.5%

of 4,533 commits in February–September 15, 2026 were committed by an AI agent — a floor, not an estimate

52.5% agent · top contributor 29.6%130 contributors

org-wide

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

2,378

agent commits

2,155

other considered commits

130

agent contributors

29.6%

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

2341assisted

37autonomous

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
Month	Agent share	Considered commits
2026-01	50%	2
2026-02	34.6%	508
2026-03	42.1%	729
2026-04	57.3%	648
2026-05	56.1%	456
2026-06	58%	593
2026-07	60.4%	775
2026-08	51.2%	527
2026-09	62.7%	295

Peak month: 62.7%. Bars are scaled to that peak, not to 100%.

Which agents

Agent	Vendor	Commits	Share
GitHub Copilot	GitHub	2373	52.3%
Claude Code	Anthropic	6	0.1%

03Evidence

Inspect the matches

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

Matched commit samples

64878f52 on GitHubReplace CoreCLR PAL wait subsystem (#132927)GitHub Copilot
0554cde3 on GitHubJIT: Keep intrinsic-only loops fully interruptible (#133884)GitHub Copilot
9b84671e on GitHub[mono][llvm] Fix malformed uaddlp/saddlp intrinsic declarations (#132744)GitHub Copilot
25f20c2f on GitHubAdd regression test for expired self-signed trusted chainClaude Code
4d84d0ea on GitHubEscape C# keyword identifiers in OptionsValidator generated code (#130415)Claude Code
4aa41b73 on GitHub[JSON] Fix source generator serializing null byte[] as empty string (#1298Claude Code

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	4,643
Merge commits removed	−9
CI / dependency bots removed	−101
Considered	4,533

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: dotnet/runtime
Default branch: main
Resolved HEAD: f92f93994a587f69d6f7510d5390e68bd5290b2b ↗
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.

CohortC# · 21 eligible repositories · at least 100 considered commits2026-09-18-v3.0 · February–September 15, 2026 · 10 of 31 ecosystem repositories excluded

Agent-commit share position98th percentile

Midrank percentile; equal shares split the tied positions.

Repository: 52.5%
Cohort median: 2.1%
Share rank: 1 / 21

0th50th100th

Percentile = (repositories below + half of 1 tied repository) ÷ 21.

Continue exploring

Claude Code commitsBrowse repositories with detected Claude Code signatures →GitHub Copilot commitsBrowse repositories with detected GitHub Copilot 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 dotnet/runtime

Scan another repository

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