# X — Agent Score

> Score: 84/100 (Grade: B) | Docs: https://docs.x.ai/developers/tools/overview | Checked: April 7, 2026

X scored 84/100 (B) on Agent Score. 11 of 22 agent-readiness checks passed.

[View full report](https://buildwithfern.com/agent-score/company/docs-x-ai-developers-tools-overview)
[All companies](https://buildwithfern.com/agent-score/llms.txt)

## Summary

- Total checks: 22
- Passed: 11
- Warnings: 3
- Failed: 5

## Category Scores

- page-size: 81/100
- observability: 60/100
- url-stability: 100/100
- authentication: 100/100
- content-structure: 100/100
- markdown-availability: 84/100
- content-discoverability: 72/100

## Check Results

### content-discoverability

- [pass] llms.txt found at 1 location(s)
- [warn] llms.txt contains parseable links but doesn't fully follow the proposed structure: https://docs.x.ai/llms.txt: No H1 heading found
- [fail] llms.txt is 922,338 characters (exceeds 100,000 threshold; will be truncated by most agents)
- [warn] All links are external; 2/10 resolve (8 failed; may be bot-detection or rate-limiting)
- [skip] All 81 links are external; cannot assess markdown support
- [pass] llms.txt directive found in all 9 sampled pages, near the top of content; 1 failed to fetch

### markdown-availability

- [warn] 8/10 sampled pages support .md URLs (80%); inconsistent support
- [pass] 9/10 sampled pages support content negotiation (90%)

### page-size

- [pass] All 10 sampled pages contain server-rendered content
- [pass] All 9 pages under 50K chars (median 11K, max 40K)
- [fail] 6 of 10 sampled pages convert to over 100K chars (max 662K, 50% boilerplate)
- [fail] 1 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 864 code fences properly closed across 10 pages

### url-stability

- [pass] All 10 sampled pages return proper error codes for bad URLs
- [pass] All 1 redirect(s) across 10 sampled pages are same-host HTTP redirects

### observability

- [skip] Sitemap has 104 URLs but none are under the docs path prefix (/developers/tools/overview)
- [fail] 2 of 9 pages have substantive content differences between markdown and HTML (avg 12% missing)
- [fail] 6 of 11 endpoints have aggressive caching or missing cache headers

### authentication

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