Summary

• Restores the GET / root discovery endpoint that existed in cog <= 0.16.x and was dropped when the Python HTTP server was replaced by coglet in v0.17.0
• Returns a JSON document listing all available API endpoints for service discovery
• Training URLs (/trainings, /trainings/{training_id}, /trainings/{training_id}/cancel) are conditionally included only when the model's OpenAPI schema contains a TrainingInput component
• cog_version reports the Python SDK version when available, falling back to the coglet runtime version

Example response

{
  "cog_version": "0.14.0",
  "docs_url": "/docs",
  "openapi_url": "/openapi.json",
  "shutdown_url": "/shutdown",
  "healthcheck_url": "/health-check",
  "predictions_url": "/predictions",
  "predictions_idempotent_url": "/predictions/{prediction_id}",
  "predictions_cancel_url": "/predictions/{prediction_id}/cancel",
  "trainings_url": "/trainings",
  "trainings_idempotent_url": "/trainings/{training_id}",
  "trainings_cancel_url": "/trainings/{training_id}/cancel"
}

Testing

• 3 new unit tests covering base discovery fields, conditional training URLs, and cog_version preference logic
• All 168 Rust tests pass, clippy clean, fmt clean