Old signals dominate; agent signals are missing
The older and more "SEO" a signal is, the more adopted it is; the newer and more "agent" it is, the more absent. HTTPS and robots.txt are above 94%. JSON-LD is at 73.02%. llms.txt, born in 2024, is at 53.97%, but with a brutal asymmetry between those who sell it (65.88%) and those it is sold to (29.27%). Wikidata is at 11.9%. And the two files defined by the agent protocols, from 2025, are at 6.35% and 0%.
| Signal | All (n=126) | Brands | Agencies |
|---|---|---|---|
| A2A Agent Card | 0 (0%) | 0 (0%) | 0 (0%) |
| MCP discovery | 8 (6.35%) | 3 (7.32%) | 5 (5.88%) |
| Wikidata | 15 (11.9%) | 12 (29.27%) | 3 (3.53%) |
| JSON-LD Organization | 92 (73.02%) | 24 (58.54%) | 68 (80%) |
| llms.txt | 68 (53.97%) | 12 (29.27%) | 56 (65.88%) |
| Sitemap ≤ 30 days | 65 (51.59%) | 20 (48.78%) | 45 (52.94%) |
| robots.txt | 119 (94.44%) | 39 (95.12%) | 80 (94.12%) |
