7 Common Mistakes When Building Custom GPT Connectors

7 Common Mistakes with Custom GPT Connectors

1. Missing operationId — the model can not reference the call
2. Vague description — the model will not pick it
3. HTTP instead of HTTPS — rejected on import
4. Wrong auth type — bearer tokens need http + bearer, not apiKey
5. No example values — reduces call success rate
6. Nested oneOf/anyOf — flatten them
7. CORS blocked — allow OpenAI IP ranges or use server-side calls

Validate your schema with our GPT Connector before every publish.