clerk.com.

level 4: agent integration

Clerk provides user authentication and management services for web and mobile applications. It offers pre-built UI components and APIs to handle user registration, login, profile management, and more. Developers can integrate Clerk into their projects to quickly implement secure and customizable user authentication flows, reducing development time and complexity.

LEVEL 1 / BASIC ACCESSIBILITY — 5/6

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

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

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) PASS

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

LEVEL 2 / DISCOVERABILITY — 5/6

Has a robots.txt that allows legitimate bot access PASS

Provides an XML sitemap PASS

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

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) PASS

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 — 4/6

Provides an MCP (Model Context Protocol) server PASS

Supports WebMCP for browser-based agent interaction FAIL

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

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

Supports webhooks for event notifications PASS

Write operations support idempotency keys FAIL

LEVEL 5 / AUTONOMOUS OPERATION — 3/6

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

Supports agent-to-agent capability negotiation FAIL

Has a subscription/management API for agents PASS

Supports multi-step workflow orchestration PASS

Can proactively notify agents of relevant changes FAIL

Supports cross-service handoff between agents FAIL

SF Entry Point

https://clerk.com/llms.txt