Introspect the calling key: workspace, environment, scopes, and the plan capabilities that gate the paid REST/Zapier surface (so an agent can discover entitlements without triggering a 402).

Identifies an automation-platform integration (the official n8n node sends n8n, the Make app sends make). When set, every call, including a connection test against /me, requires a paid plan or a trial (reads work on any of them; acting tools still need Infrastructure), else 402 AUTOMATION_NOT_ENTITLED. Omit it for plain REST usage.