Core Concepts

• Project — container for settings, entitlement configuration, and usage.
• Project ID — public identifier used by SDKs.
• API Key — secret credential for server-to-server requests.
• Context Size (cap) — maximum context window per message.
• Message Credits (MC) — integer billing unit. Minimum 1MC per call, multipliers apply at larger tiers.
• localId — stable per-NPC conversation key.
• characterDescription / characterId — optional NPC context.
• playerDescription — optional player context.