/**
 * Tool call deduplication for compaction.
 *
 * Removes repeated tool calls from message arrays before summarization.
 */
import type { AgentMessage } from "../../../agent-core/index.js";
/**
 * Deduplicate repeated tool calls in a message array by keeping only the
 * most recent occurrence of each (tool, args) pair.
 *
 * Strategy:
 * - **Idempotent-read tools** (read, grep, glob): same (name, args) → keep last only.
 *   These tools return the same content for the same arguments.
 * - **Output-dependent tools** (bash): same (name, args, output) → keep last only.
 *   Two bash calls with same command but different output are NOT duplicates.
 * - **Mutating tools** (edit, write): never deduplicated. Chronological ordering
 *   of mutations matters for correctness.
 * - **Unknown tools** (extensions, MCP, custom): never deduplicated. Conservative
 *   by default — only tools in the known sets above participate.
 *
 * Deduplication removes both the ToolCall block from the assistant message
 * and the corresponding ToolResultMessage from the array.
 *
 * Recalculated each time compaction runs — prompt cache is only impacted
 * alongside compression, not on every turn.
 */
export declare function deduplicateToolCalls(messages: AgentMessage[]): AgentMessage[];
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