BILL API scores 85/100 (Grade B), passing 16 of 22 checks (73%). The documentation is broadly accessible to AI agents but has 5 areas that could be improved to better serve automated tooling.
# Agent Score Fix Report — BILL API URL: https://developer.bill.com Score: 85/100 (Grade B) I need help improving the AI-readiness of the documentation at https://developer.bill.com. Agent Score found 2 failing checks and 3 warnings. ## Failing Checks (2) - [content-discoverability] Llms Txt Size: llms.txt is 136,386 characters (exceeds 100,000 threshold; will be truncated by most agents) - [content-discoverability] Llms Txt Directive: No llms.txt directive found in any of 10 sampled pages ## Warnings (3) - [content-discoverability] Llms Txt Valid: llms.txt contains parseable links but doesn't fully follow the proposed structure: https://developer.bill.com/llms.txt: No blockquote summary found - [markdown-availability] Content Negotiation: Content negotiation partially supported: 0 correct type, 10 wrong type, 0 HTML only - [observability] Markdown Content Parity: 2 of 10 pages have minor content differences between markdown and HTML ## Fix Instructions For each issue above, please: 1. Analyze the documentation site at https://developer.bill.com 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 https://developer.bill.com --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
CHECK RESULTS
How your docs scored
auth-gate-detectionAll 10 sampled pages are publicly accessible
auth-alternative-accessAll docs pages are publicly accessible; no alternative access paths needed
llms-txt-sizellms.txt is 136,386 characters (exceeds 100,000 threshold; will be truncated by most agents)
llms-txt-directiveNo llms.txt directive found in any of 10 sampled pages
llms-txt-validllms.txt contains parseable links but doesn't fully follow the proposed structure: https://developer.bill.com/llms.txt: No blockquote summary found
llms-txt-existsllms.txt found at 1 location(s)
llms-txt-links-resolveAll 10 same-origin sampled links resolve (482 total links)
llms-txt-links-markdown9/10 same-origin sampled links point to markdown content (90%) (5 external links excluded)
content-negotiationContent negotiation partially supported: 0 correct type, 10 wrong type, 0 HTML only
markdown-url-support10/10 sampled pages support .md URLs (100%)
markdown-content-parity2 of 10 pages have minor content differences between markdown and HTML
llms-txt-freshnessllms.txt covers 100% of 441 sitemap doc pages
cache-header-hygieneAll 11 endpoints have appropriate cache headers
rendering-strategyAll 10 sampled pages contain server-rendered content
page-size-markdownAll 10 pages under 50K chars (median 9K, max 37K)
page-size-htmlAll 10 sampled pages convert under 50K chars (median 9K, 0% boilerplate)
content-start-positionContent starts within first 10% on all 10 sampled pages (median 0%)
tabbed-content-serializationNo tabbed content detected across 10 sampled pages
section-header-qualityNo tabbed content found; header quality check not applicable
markdown-code-fence-validityAll 13 code fences properly closed across 11 pages
http-status-codesAll 10 sampled pages return proper error codes for bad URLs
redirect-behaviorNo redirects detected across 10 sampled pages
