levels

how we rate.

6 binary criteria per level. need 4/6 to pass.
your level is the highest one you pass. L0 means no level passed yet.

Basic Accessibility

can agents read your content?

Uses semantic HTML elements (header, nav, main, article, section, footer) instead of just divs

l1_semantic_html

Has proper meta tags (title, description, og:tags, twitter:card)

l1_meta_tags

Includes Schema.org JSON-LD structured data

l1_schema_org

Does not block automated access with CAPTCHAs on public content

l1_no_captcha

Content is server-side rendered (visible in HTML source, not just JS-rendered)

l1_ssr_content

Uses clean, readable URLs (no excessive query params or hash fragments)

l1_clean_urls

Discoverability

can agents find things on your site?

Has a robots.txt that allows legitimate bot access

l2_robots_txt

Provides an XML sitemap

l2_sitemap

Has a /llms.txt file describing the site for LLMs

l2_llms_txt

Publishes an OpenAPI/Swagger specification for its API

l2_openapi_spec

Has comprehensive, machine-readable documentation

l2_documentation

Primary content is text-based (not locked in images/videos/PDFs)

l2_text_content

Structured Interaction

can agents talk to your APIs?

Provides a structured REST or GraphQL API

l3_structured_api

API returns JSON responses with consistent schema

l3_json_responses

API supports search and filtering parameters

l3_search_filter_api

Has an A2A agent card at /.well-known/agent.json

l3_a2a_agent_card

Rate limits are documented and return proper 429 responses with Retry-After

l3_rate_limits_documented

API returns structured error responses with error codes and messages

l3_structured_errors

Agent Integration

can agents do real work on your site?

Provides an MCP (Model Context Protocol) server

l4_mcp_server

Supports WebMCP for browser-based agent interaction

l4_webmcp

API supports write operations (POST/PUT/PATCH/DELETE), not just reads

l4_write_api

Supports agent-friendly authentication (API keys, OAuth client credentials)

l4_agent_auth

Supports webhooks for event notifications

l4_webhooks

Write operations support idempotency keys

l4_idempotency

Autonomous Operation

can agents operate autonomously?

Supports event streaming (SSE, WebSockets) for real-time updates

l5_event_streaming

Supports agent-to-agent capability negotiation

l5_agent_negotiation

Has a subscription/management API for agents

l5_subscription_api

Supports multi-step workflow orchestration

l5_workflow_orchestration

Can proactively notify agents of relevant changes

l5_proactive_notifications

Supports cross-service handoff between agents

l5_cross_service_handoff