REAL SERVER HTTP RECORDING | BEFORE
Commit: d290c1f1b6c93416dfda6c9f7cd15d928a9aeb4c
Environment: Linux; isolated fresh database; no copied data; no credentials
Transport: loopback HTTP; external callbacks are HTTPS; synthetic OAuth client

1. POST /oauth/mcp/register
Client: Six Callback Evidence
Callbacks (same six on both sides):
  https://callback.example.com/oauth/1
  https://callback.example.com/oauth/2
  https://callback.example.com/oauth/3
  https://callback.example.com/oauth/4
  https://callback.example.com/oauth/5
  https://callback.example.com/oauth/6
grant_types=[authorization_code]; response_types=[code]; auth_method=none
HTTP 400
{
  "error": "invalid_redirect_uri",
  "error_description": "Register between 1 and 5 redirect URIs."
}

2. Authorization cannot start: registration returned no client_id.

End of recorded HTTP interaction. No Spark account or T3 Connect used.