Required for Custom GPT, Gemini AI Studio, Claude/Cursor MCP, and scripted benchmarks - not for the ChatGPT App (OAuth).

1. Open create.guides.co/ai (Studio → Connect an AI).
2. Click Generate new API key and copy the token (shown once).
3. Copy the Instructions for your AI block on the same page into your agent's system prompt.

Token format:

Authorization: Bearer gdf.{account_id}.{key_id}.{secret}

API base: https://guides.co/api/gdf/v1

Org portals: use Settings → Integrations on the portal account instead of Studio.

Revoke keys from Studio if exposed. Keys access guides on the account that issued them only.