/** Stable identity from a credential — the Supabase user id for OAuth, else a hash of the API key. */
export declare function distinctIdFor(credential: string | undefined): string;
/**
 * Fire `first_tool_call` the first time a given identity completes a tool
 * call, so activation (site visit → connector install → first real use) is a
 * queryable event instead of "earliest mcp_tool_call per person" math. Never
 * fires for "anonymous" (no credential at all — nothing to attribute
 * activation to). Best-effort dedup only: the set is per-process, so a
 * session that lands on a different Fly machine can refire once — acceptable
 * for an activation metric read in aggregate.
 */
export declare function captureFirstToolCallOnce(distinctId: string, properties?: Record<string, unknown>): void;
export declare function captureEvent(event: string, distinctId: string, properties?: Record<string, unknown>): void;