xint-three-phase-credential-model-for-capability-gating

xint capabilities activate in three credential-gated phases: Phase 1 (xAI API key only — 8 commands: analyze, ai-search, report, article, collections, costs, health, capabilities), Phase 2 (X Bearer Token — 11 commands including search, profile, tweet, thread, trends, watch, stream), Phase 2b (OAuth 2.0 Client ID — 17 command families including engage, analytics, growth, bookmark KB). The system should auto-detect available credentials and expose only valid commands to avoid confusing agents with unavailable tools.