open-meteo.com.

level 3: structured interaction

Open-Meteo is a free weather API providing accurate weather forecasts for any location worldwide. It offers a JSON API for easy integration into applications, requiring no API key for non-commercial use. You can retrieve high-resolution weather data, including forecasts, from national weather services. Use the API to access detailed weather information for various applications and projects.

LEVEL 1 / BASIC ACCESSIBILITY — 2/6

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

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

Includes Schema.org JSON-LD structured data FAIL

Does not block automated access with CAPTCHAs on public content PASS

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

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

LEVEL 2 / DISCOVERABILITY — 2/6

Has a robots.txt that allows legitimate bot access PASS

Provides an XML sitemap FAIL

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

Publishes an OpenAPI/Swagger specification for its API FAIL

Has comprehensive, machine-readable documentation PASS

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

LEVEL 3 / STRUCTURED INTERACTION — 5/6

Provides a structured REST or GraphQL API PASS

API returns JSON responses with consistent schema PASS

API supports search and filtering parameters PASS

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

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

API returns structured error responses with error codes and messages PASS

LEVEL 4 / AGENT INTEGRATION — 0/6

Provides an MCP (Model Context Protocol) server FAIL

Supports WebMCP for browser-based agent interaction FAIL

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

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

Supports webhooks for event notifications FAIL

Write operations support idempotency keys FAIL

LEVEL 5 / AUTONOMOUS OPERATION — 0/6

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

Supports agent-to-agent capability negotiation FAIL

Has a subscription/management API for agents FAIL

Supports multi-step workflow orchestration FAIL

Can proactively notify agents of relevant changes FAIL

Supports cross-service handoff between agents FAIL