xint-credential-phasing-model-three-tiers

xint capabilities split across three credential tiers: Phase 1 (xAI key only — 8 commands: analyze, ai-search, report, article, collections, costs, health, capabilities), Phase 2 (+ X Bearer Token — 11 commands including search, profile, watch, stream, media), Phase 2b (+ OAuth 2.0 Client ID — 17 command families including engage, analytics, growth, moderation, bookmark KB). System auto-detects available credentials and exposes only valid commands.