Developer Tools & APIs, ranked
Sites in Developer Tools & APIs, ordered by how well language models and agents can read them. Each row splits the score into the readable base, the agent layer and penalties.
How the score is calculatedBrowse Developer Tools & APIs in the directory
- Ranked
- 39
- Median score
- 63
- New this week
- 6
- Latest scan
- 27 Oct 2026
- Excellent 3
- Good 7
- Fair 23
- Poor 6
1 site match
A2A agent card (remove capability filter)| Place | Site | Score | |||
|---|---|---|---|---|---|
| 15th place | 44 | 24 | +2 A2A Agent Card, x402 and MPP payments | View report for CitePulse AI v4.0: |
Places follow the score; on an equal score, more agent capabilities (the +N on the badge) come first. Sites equal on both share a place. Filters and other orders hide rows but never renumber them.
New added in the last seven daysChecks:full passhalfmisseddoes not apply
Promarks a Pro listing, in gold. Pro never changes a score or a place.What Pro includes
From the latest scans
How Developer Tools & APIs sites do on each check
Missed most often
Missing or partial on 35 of the 39 sites it applies to. Guide: How to serve Markdown to AI agents with content negotiation →
Missing or partial on 35 of the 39 sites it applies to. Guide: How to serve Markdown to AI agents with content negotiation →
Missing or partial on 32 of the 39 sites it applies to. Guide: How to write robots.txt rules for AI crawlers →
Where the top 10 pull ahead
- Markdown at its own URLTop 10100%Below7%
10 of 10 in the top 10 pass it, against 2 of 29 below.
- llms.txt qualityTop 1090%Below31%
9 of 10 in the top 10 pass it, against 9 of 29 below.
- llms.txtTop 10100%Below48%
10 of 10 in the top 10 pass it, against 14 of 29 below.
| Check | This ranking | All sites | Top 10 | Below |
|---|---|---|---|---|
| Readable base Share of sites with a full pass. | ||||
| robots.txt | 97% | 98% | 100% | 97% |
| Sitemaps | 97% | 96% | 100% | 97% |
| schema.org structured data | 82% | 72% | 100% | 76% |
| Semantic HTML | 56% | 56% | 90% | 45% |
| Crawlable navigation links | 95% | 92% | 100% | 93% |
| Names for links and buttons | 85% | 88% | 90% | 83% |
| Names and semantics for form fields | 75% | 72% | 75% | 75% |
| Roles, states and relationships for controls | 72% | 73% | 70% | 72% |
| Canonical URL | 95% | 93% | 89% | 97% |
| Section links | 88% | 88% | 100% | 83% |
| Agent layer Share of sites with a full pass. | ||||
| llms.txt | 62% | 55% | 100% | 48% |
| llms.txt quality | 46% | 38% | 90% | 31% |
| Markdown at its own URL | 31% | 23% | 100% | 7% |
| Markdown negotiation | 10% | 8% | 30% | 3% |
| Explicit AI crawler rules | 28% | 34% | 50% | 21% |
| AI usage preferences | 18% | 7% | 50% | 7% |
| Typed discovery links | 10% | 6% | 30% | 3% |
| Penalties Share of sites where the problem was not found. | ||||
| Bot challenges | 100% | 98% | 100% | 100% |
| Indexing and snippet restrictions | 100% | 100% | 100% | 100% |
| Content without JavaScript | 100% | 99% | 100% | 100% |
| Search crawler access | 100% | 99% | 100% | 100% |
| Homepage availability | 100% | 99% | 100% | 100% |
| Page title and description | 100% | 99% | 100% | 100% |
| Redirect chains | 100% | 100% | 100% | 100% |
| Crawler response time | 100% | 99% | 100% | 100% |
| Agent capabilities Share of sites that publish it. Never a point either way. | ||||
| API Catalog | 8% | 4% | 30% | 0% |
| auth.md | 5% | 2% | 20% | 0% |
| MCP Server Card | 0% | 0% | 0% | 0% |
| A2A Agent Card | 3% | 2% | 0% | 3% |
| Agent Skills discovery | 8% | 3% | 30% | 0% |
| WebMCP declarations | 0% | 0% | 0% | 0% |
| Web Bot Auth | 0% | 1% | 0% | 0% |
| x402 and MPP payments | 3% | 1% | 0% | 3% |
| ACP discovery | 0% | 1% | 0% | 0% |
| UCP discovery | 0% | 0% | 0% | 0% |
| AMP discovery | 0% | 0% | 0% | 0% |
More rankings
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