540 of 1,922 top GitHub repositories (28.1 %) have an AGENTS.md
675 (35.1 %) have at least one agent-instruction file of the 8 kinds tracked here. Sample: 1,922 public repositories, top by stars across 10 languages, re-checked every day at 04:00 UTC. Only presence, size and a link are recorded — never the contents.
AGENTS.md
540 of 1,922
CLAUDE.md
325 of 1,922
.cursorrules
16 of 1,922
.cursor/rules/
35 of 1,922
copilot-instructions.md
163 of 1,922
llms.txt
17 of 1,922
GEMINI.md
21 of 1,922
.windsurfrules
6 of 1,922
Added today (2026-11-02 UTC)
Baseline day: the first scan establishes what exists; additions are counted from the next scan on.
Machine-readable: today.json · stats.json · RSS of new AGENTS.md files.
By language
| Language | Repos | Any file | AGENTS.md | CLAUDE.md | .cursorrules | .cursor/rules/ | copilot-instructions.md | llms.txt | GEMINI.md | .windsurfrules |
|---|---|---|---|---|---|---|---|---|---|---|
| Rust | 198 | 98 (49.5 %) | 88 (44.4 %) | 56 (28.3 %) | 1 (0.5 %) | 5 (2.5 %) | 13 (6.6 %) | 3 (1.5 %) | 4 (2.0 %) | 1 (0.5 %) |
| Python | 197 | 75 (38.1 %) | 65 (33.0 %) | 40 (20.3 %) | 3 (1.5 %) | 6 (3.0 %) | 18 (9.1 %) | 3 (1.5 %) | 4 (2.0 %) | 1 (0.5 %) |
| TypeScript | 195 | 122 (62.6 %) | 99 (50.8 %) | 63 (32.3 %) | 4 (2.1 %) | 10 (5.1 %) | 19 (9.7 %) | 3 (1.5 %) | 3 (1.5 %) | 1 (0.5 %) |
| Go | 193 | 81 (42.0 %) | 64 (33.2 %) | 45 (23.3 %) | 1 (0.5 %) | 2 (1.0 %) | 17 (8.8 %) | 3 (1.6 %) | 2 (1.0 %) | 0 (0.0 %) |
| Java | 193 | 51 (26.4 %) | 47 (24.4 %) | 20 (10.4 %) | 0 (0.0 %) | 1 (0.5 %) | 12 (6.2 %) | 0 (0.0 %) | 0 (0.0 %) | 0 (0.0 %) |
| JavaScript | 191 | 46 (24.1 %) | 33 (17.3 %) | 22 (11.5 %) | 0 (0.0 %) | 3 (1.6 %) | 10 (5.2 %) | 3 (1.6 %) | 1 (0.5 %) | 0 (0.0 %) |
| C++ | 191 | 64 (33.5 %) | 50 (26.2 %) | 18 (9.4 %) | 3 (1.6 %) | 1 (0.5 %) | 22 (11.5 %) | 0 (0.0 %) | 2 (1.0 %) | 0 (0.0 %) |
| PHP | 191 | 36 (18.8 %) | 25 (13.1 %) | 20 (10.5 %) | 0 (0.0 %) | 4 (2.1 %) | 11 (5.8 %) | 0 (0.0 %) | 2 (1.0 %) | 0 (0.0 %) |
| Ruby | 189 | 41 (21.7 %) | 34 (18.0 %) | 20 (10.6 %) | 2 (1.1 %) | 3 (1.6 %) | 12 (6.3 %) | 1 (0.5 %) | 1 (0.5 %) | 1 (0.5 %) |
| C# | 184 | 61 (33.2 %) | 35 (19.0 %) | 21 (11.4 %) | 2 (1.1 %) | 0 (0.0 %) | 29 (15.8 %) | 1 (0.5 %) | 2 (1.1 %) | 2 (1.1 %) |
| All | 1922 | 675 (35.1 %) | 540 (28.1 %) | 325 (16.9 %) | 16 (0.8 %) | 35 (1.8 %) | 163 (8.5 %) | 17 (0.9 %) | 21 (1.1 %) | 6 (0.3 %) |
By day
| Date (UTC) | Scanned | AGENTS.md | CLAUDE.md | .cursorrules | .cursor/rules/ | copilot-instructions.md | llms.txt | GEMINI.md | .windsurfrules |
|---|---|---|---|---|---|---|---|---|---|
| 2026-11-02 | 1922 | 540 | 325 | 16 | 35 | 163 | 17 | 21 | 6 |
Counts are absolute; the sample can grow, so compare shares (see the sparklines above) rather than raw counts across days. Full history: stats.json.
How it works
- Sample. 1,922 public, non-fork, non-archived repositories with the most stars per language (GitHub Search API, collected once and extended over time). 0 are currently unreachable (moved or removed) and excluded.
- Check. Once a day a HEAD request per path against the default branch: a
200means the file exists,Content-Lengthis its size..cursor/rules/is checked as a directory. Names are matched case-sensitively, exactly as the conventions spell them. - Added today. A path present in today's scan and absent in the previous snapshot of the same repository. Links go to the file on GitHub via
/go/<id>/, a plain redirect page. - Not done. No file contents are stored or shown. No accounts, no cookies, no JavaScript, no tracking of visitors.