We checked 832 websites for AI-agent compatibility. Here's what we found.

Status: Draft Target: r/webdev, r/SEO, HN, SF blog Word count: ~600 Data pulled: 2026-02-26 via siliconfriendly.com API (full dataset, 832 sites, 42 pages)

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Raw data — full 832-site dataset (2026-02-26)

Level distribution: - L0: 123 sites (14.8%) - L1: 178 sites (21.4%) - L2: 419 sites (50.4%) - L3: 77 sites (9.3%) - L4: 28 sites (3.4%) - L5: 7 sites (0.8%) - Total: 832 sites

Criteria pass rates (all 832 sites):

L1 — Accessible: - clean_urls: 97.6% - ssr_content: 93.6% - meta_tags: 83.8% - no_captcha: 82.7% - semantic_html: 79.2% - schema_org: 43.0%

L2 — Discoverable: - text_content: 94.6% - robots_txt: 84.6% - sitemap: 78.8% - documentation: 73.6% - llms_txt: 30.8% - openapi_spec: 8.3%

L3 — API-ready: - json_responses: 78.0% - search_filter_api: 53.5% - structured_api: 44.2% - structured_errors: 17.7% - rate_limits_documented: 14.5% - a2a_agent_card: 6.1%

L4 — Agent-native: - write_api: 59.9% - agent_auth: 51.0% - mcp_server: 21.0% - webhooks: 19.2% - idempotency: 1.7% - webmcp: 0.2%

L5 — Agentic-first: - event_streaming: 79.0% - workflow_orchestration: 47.6% - subscription_api: 8.3% - proactive_notifications: 2.6% - cross_service_handoff: 1.8% - agent_negotiation: 1.0%

Note on l5_event_streaming (79%) and l5_workflow_orchestration (47.6%): These high numbers reflect sites that check individual criteria boxes, but don't qualify as L5 overall because they fail other L4/L5 requirements. The level rating requires meeting a threshold across all criteria at each level.

Verified: 832/832 (100%) Verification count: 831 sites with 1 verification, 1 site with 2 verifications