generated: '2026-09-19'
method: probed
source: live GET of /.well-known/* on every apis.yml host
note: 'Three real documents were served. The MCP host publishes both RFC 8414 authorization-server metadata
  and RFC 9728 protected-resource metadata, which is what lets an MCP client complete the OAuth flow without
  any out-of-band configuration. The Auth0 custom domain auth0.sybilion.com serves full OIDC discovery
  for the Developers Portal session. The API host api.sybilion.dev serves nothing under /.well-known/
  (clean 404s from the Go router). IMPORTANT — the marketing/ portal host sybilion.dev answers HTTP 200
  with the same 10,864-byte single-page-app shell for EVERY /.well-known/* path probed; those are soft
  404s, not documents, and are recorded as misses.


  MCP-host OAuth discovery added 2026-09-19 (roadmap#321/#337): the harvest visits a provider''s primary
  hosts, and RFC 9728 protected-resource metadata lives on the MCP host, so these documents existed and
  were invisible to the scorer. Fetched live and validated on `resource`/`issuer`; one negative control
  per host.'
hosts:
- host: mcp.sybilion.dev
  documents:
  - path: /.well-known/oauth-authorization-server
    status: 200
    content_type: application/json
    file: sybilion-oauth-authorization-server.json
    spec: RFC 8414
  - path: /.well-known/oauth-protected-resource
    status: 200
    content_type: application/json
    file: sybilion-oauth-protected-resource.json
    spec: RFC 9728
  - path: /.well-known/oauth-protected-resource/mcp
    status: 200
    content_type: application/json
    spec: RFC 9728
    note: advertised in the WWW-Authenticate challenge on POST /mcp; same body as the root resource doc
  - path: /.well-known/security.txt
    status: 404
  - path: /.well-known/openid-configuration
    status: 404
  - path: /.well-known/api-catalog
    status: 404
  - path: /.well-known/ai-plugin.json
    status: 404
  - path: /.well-known/agent-card.json
    status: 404
  - path: /.well-known/agent.json
    status: 404
  - path: /.well-known/oauth-protected-resource
    status: 200
    file: sybilion-mcp-oauth-protected-resource.json
    bytes: 135
  - path: /.well-known/oauth-authorization-server
    status: 200
    file: sybilion-mcp-oauth-authorization-server.json
    bytes: 746
  path_echo_control: passed
- host: auth0.sybilion.com
  note: Auth0 custom domain backing the Developers Portal login and the MCP OAuth flow
  documents:
  - path: /.well-known/openid-configuration
    status: 200
    content_type: application/json
    file: sybilion-openid-configuration.json
    spec: OpenID Connect Discovery 1.0
  - path: /.well-known/oauth-authorization-server
    status: 200
    content_type: application/json
    note: identical body to the OIDC discovery document
- host: api.sybilion.dev
  documents:
  - path: /.well-known/security.txt
    status: 404
  - path: /.well-known/openid-configuration
    status: 404
  - path: /.well-known/oauth-authorization-server
    status: 404
  - path: /.well-known/oauth-protected-resource
    status: 404
  - path: /.well-known/api-catalog
    status: 404
  - path: /.well-known/ai-plugin.json
    status: 404
  - path: /.well-known/agent-card.json
    status: 404
  - path: /.well-known/agent.json
    status: 404
- host: sybilion.dev
  note: SPA catch-all. Every path below returned 200 with the identical 10,864-byte HTML shell titled
    "Sybilion Developers Portal". Treated as a MISS, not a hit.
  documents:
  - path: /.well-known/security.txt
    status: 200
    content_type: text/html
    hit: false
  - path: /.well-known/openid-configuration
    status: 200
    content_type: text/html
    hit: false
  - path: /.well-known/oauth-authorization-server
    status: 200
    content_type: text/html
    hit: false
  - path: /.well-known/oauth-protected-resource
    status: 200
    content_type: text/html
    hit: false
  - path: /.well-known/api-catalog
    status: 200
    content_type: text/html
    hit: false
  - path: /.well-known/ai-plugin.json
    status: 200
    content_type: text/html
    hit: false
  - path: /.well-known/agent-card.json
    status: 200
    content_type: text/html
    hit: false
  - path: /.well-known/agent.json
    status: 200
    content_type: text/html
    hit: false
summary:
  paths_probed: 27
  real_documents: 4
  soft_200_html_shells: 8
  security_txt: false
  api_catalog: false
  agent_card: false
x-mcp-probe:
  probed: '2026-09-19'
  issue: roadmap#321, roadmap#337
  documents:
  - host: https://mcp.sybilion.dev
    path: /.well-known/oauth-protected-resource
    file: sybilion-mcp-oauth-protected-resource.json
  - host: https://mcp.sybilion.dev
    path: /.well-known/oauth-authorization-server
    file: sybilion-mcp-oauth-authorization-server.json
  validated_on: resource (RFC 9728) / issuer (RFC 8414, OIDC)
  negative_control: one per host; a 2xx JSON object at an impossible path discards the host