import type { Message } from '../../types/message/index.js';
import type { ToolRegistryContract } from '../../types/tool/index.js';
/**
 * Request-only exact observation masking. Every reference targets a full result
 * in THIS projection. Recompute from canonical history, never from yesterday's
 * mask, so removing a former representative cannot leave a dangling reference.
 * No tool executions are skipped, and equal output is not a freshness claim.
 */
export declare function projectObservationContext(messages: Message[], tools: Pick<ToolRegistryContract, 'get'>, preserveToolResultsFrom?: readonly string[]): Message[];
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