/**
 * Session-scoped injectedContext dedupe (B1).
 *
 * Agim Agent dumps system+ephemeral into every turn's activity for the
 * accordion viewer. The skills-heavy system prompt (~tens of KB) was being
 * persisted verbatim on every assistant message, blowing up session JSON.
 *
 * Persist the full text once; later identical turns store a short marker.
 * History / SPA expand the marker back to the prior full copy for display.
 */
/** Wire + disk stub when this turn's injection matches an earlier full copy. */
export declare const INJECTED_CONTEXT_UNCHANGED_MARKER = "\u00ABagim-ic-unchanged\u00BB";
export declare function isInjectedContextUnchangedMarker(text: string | undefined | null): boolean;
/** Persist full text, or the unchanged marker when equal to a prior full copy. */
export declare function dedupeInjectedContextForPersist(text: string | undefined, priorFull: string | undefined): string | undefined;
/** Resolve a stored value (full or marker) against the last known full text. */
export declare function resolveInjectedContextText(stored: string | undefined, priorResolved: string | undefined): string | undefined;
type ActivityWithInjected = {
    injectedContext?: string;
};
type MessageWithActivity = {
    activity?: ActivityWithInjected;
};
/**
 * Walk messages oldest→newest and expand unchanged markers to the last full
 * injectedContext. Returns the same array reference when nothing changes.
 */
export declare function expandInjectedContextsInMessages<T extends MessageWithActivity>(messages: T[]): T[];
/** Last full (non-marker) injectedContext in a message list, scanning newest first. */
export declare function findLastFullInjectedContext(messages: Array<{
    activity?: {
        injectedContext?: string;
    };
}>): string | undefined;
export {};
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