# Claude API — Agent Score

> Score: 71/100 (Grade: C) | Docs: https://docs.anthropic.com | Checked: April 2, 2026

Claude API scored 71/100 (C) on Agent Score. 10 of 22 agent-readiness checks passed.

[View full report](https://buildwithfern.com/agent-score/company/claude-api)
[All companies](https://buildwithfern.com/agent-score/llms.txt)

## Summary

- Total checks: 22
- Passed: 10
- Warnings: 5
- Failed: 6

## Check Results

### content-discoverability

- [warn] llms.txt found but only reachable via cross-host redirect (agents may not follow it); 1 failed to fetch
- [warn] llms.txt contains parseable links but doesn't fully follow the proposed structure: https://platform.claude.com/llms.txt: No blockquote summary found
- [warn] llms.txt is 64,354 characters (between 50,000 and 100,000; consider splitting)
- [pass] All 10 same-origin sampled links resolve (621 total links)
- [pass] 10/10 same-origin sampled links point to markdown content (100%)
- [fail] No llms.txt directive found in any of 10 sampled pages

### markdown-availability

- [warn] 7/10 sampled pages support .md URLs (70%); inconsistent support
- [warn] Content negotiation partially supported: 7 correct type, 0 wrong type, 3 HTML only

### page-size

- [pass] All 10 sampled pages contain server-rendered content
- [fail] 2 of 7 pages exceed 100K chars (max 125K)
- [fail] 2 of 10 sampled pages convert to over 100K chars (max 125K, 0% boilerplate)
- [fail] 3 of 10 sampled pages have content starting past 50% (worst 100%)

### content-structure

- [pass] No tabbed content detected across 10 sampled pages
- [pass] No tabbed content found; header quality check not applicable
- [pass] All 27 code fences properly closed across 8 pages

### url-stability

- [fail] 10 of 10 sampled pages return 200 for non-existent URLs (soft 404)
- [pass] No redirects detected across 10 sampled pages

### observability

- [pass] llms.txt covers 100% of 620 sitemap doc pages
- [fail] 3 of 7 pages have substantive content differences between markdown and HTML (avg 16% missing)
- [pass] All 11 endpoints have appropriate cache headers

### authentication

- [pass] All 10 sampled pages are publicly accessible
- [skip] All docs pages are publicly accessible; no alternative access paths needed