When to use - Any access to an external API. - External API calls must go through Nango . - Do not use MCPs, provider CLIs, or ad-hoc direct API calls outside Nango. Configuration (required) Resolve values in this order. Secret key 1. in the process environment 2. in a local If missing, ask the user to: - create a Nango account: https://app.nango.dev/signup - copy the secret key from Environment settings → Backend - set in their shell profile (offer to add it) Compatibility: if other instructions refer to , treat it as . Base URL 1. in the process environment 2. in a local 3. HTTP headers - -…