Tanstack

# Agent Score Fix Report — Tanstack
URL: https://tanstack.com/router/latest/docs/overview
Score: 76/100 (Grade C)

I need help improving the AI-readiness of the documentation at https://tanstack.com/router/latest/docs/overview.
Agent Score found 4 failing checks and 4 warnings.

## Failing Checks (4)
- [content-discoverability] Llms Txt Directive: No llms.txt directive found in any of 10 sampled pages
- [page-size] Page Size Html: 3 of 10 sampled pages convert to over 100K chars (max 214K, 41% boilerplate)
- [url-stability] Http Status Codes: 2 of 8 sampled pages return 200 for non-existent URLs (soft 404); 2 failed to fetch
- [observability] Llms Txt Freshness: llms.txt covers 0/1 sitemap doc pages (0%); 1 missing

## Warnings (4)
- [content-discoverability] Llms Txt Links Markdown: Same-origin links point to HTML, but 7 have .md variants available (16 external links excluded)
- [markdown-availability] Markdown Url Support: 7/10 sampled pages support .md URLs (70%); inconsistent support
- [markdown-availability] Content Negotiation: Content negotiation partially supported: 4 correct type, 0 wrong type, 6 HTML only
- [page-size] Content Start Position: 2 of 10 sampled pages have content starting at 10–50% (worst 30%)

## Fix Instructions

For each issue above, please:
1. Analyze the documentation site at https://tanstack.com/router/latest/docs/overview
2. Implement the specific fix
3. Verify the fix would cause the check to pass

### Common fixes:
- **No llms.txt**: Create /llms.txt following https://llmstxt.org — list all doc pages in markdown format
- **No .md URL support**: Configure your docs platform to serve pages at equivalent .md URLs (e.g. /docs/quickstart.md)
- **No content negotiation**: Return markdown when request includes Accept: text/markdown header
- **Large page size**: Reduce nav boilerplate, inline scripts, and repetitive markup
- **No sitemap**: Generate /sitemap.xml listing all documentation URLs
- **Auth walls**: Ensure docs pages return 200 without requiring login cookies or tokens
- **No Last-Modified header**: Configure your server/CDN to include Last-Modified response headers
- **Tab content hidden**: Ensure tabbed content is rendered in the HTML (not JS-only) so agents can read all variants

## Run afdocs Locally for More Detail

To get deeper visibility into what's failing, run afdocs against your docs:

  npx afdocs check https://tanstack.com/router/latest/docs/overview --fixes --verbose

- **--fixes**: Adds "Fix:" lines to the output for each warn/fail check with actionable remediation steps
- **-v, --verbose**: Shows per-page details (specific URLs, character counts, error codes) for checks with issues — useful for per-URL visibility into what's failing