fusionauth.io.

level 2: discoverable

FusionAuth is an authentication and user management platform. It provides tools for implementing features like single sign-on (SSO), multi-factor authentication (MFA), and integrations with OAuth2 and OpenID Connect. You can use FusionAuth to securely manage user identities and authentication flows within your applications. It offers a customizable solution for handling user registration, login, and access control.

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 PASS

Does not block automated access with CAPTCHAs on public content FAIL

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 — 6/6

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 PASS

Has comprehensive, machine-readable documentation PASS

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

LEVEL 3 / STRUCTURED INTERACTION — 2/6

Provides a structured REST or GraphQL API FAIL

API returns JSON responses with consistent schema PASS

API supports search and filtering parameters FAIL

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 FAIL

LEVEL 4 / AGENT INTEGRATION — 2/6

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) PASS

Supports webhooks for event notifications PASS

Write operations support idempotency keys FAIL

LEVEL 5 / AUTONOMOUS OPERATION — 1/6

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

Supports agent-to-agent capability negotiation FAIL

Has a subscription/management API for agents FAIL

Supports multi-step workflow orchestration FAIL

Can proactively notify agents of relevant changes FAIL

Supports cross-service handoff between agents FAIL

SF Entry Point

https://fusionauth.io/llms.txt