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# Type Alias Principal

```typescript
Principal:
    | { kind: "project"; projectId: string }
    | {
        kind: "agent";
        projectId: string;
        sessionId?: string;
        terminalId?: string;
    }
    | { displayName: string; id: string; kind: "site-user"; siteId: string }
    | { kind: "community-member"; membershipId: string; projectId: string }
    | { kind: "assistant" }
    | { kind: "user" }
    | { kind: "host" }
```

Closed cross-plane identity vocabulary.