/**
 * MCP Evidence Hooks — Pure A2A Sideband Artifacts
 *
 * Captures tool arguments and results from the Copilot SDK's
 * onPreToolUse / onPostToolUse session hooks, then emits structured
 * A2A TaskArtifactUpdateEvent with `trace.*` artifact keys.
 *
 * These "sideband artifacts" flow through the A2A protocol itself —
 * no Kafka, no custom transport. The orchestrator receives them alongside
 * the normal response artifacts and forwards trace.* artifacts to its
 * event emitter (Kafka) for storage and UI display.
 *
 * Artifact key conventions:
 *   trace.mcp        — MCP tool call (request + response)
 *   trace.thought     — Agent reasoning / chain of thought
 *   trace.delegation  — Sub-agent delegation (child task link)
 *
 * The parent agent's LLM only reads `response` artifacts.
 * Everything prefixed with `trace.` is observability-only data.
 */
import type { AgentEventEmitter } from "@a2a-wrapper/core";
export declare class McpEvidenceHooks {
    private emitter;
    /** Correlate start/end by session+toolName → { toolCallId, args, startTime }. */
    private activeToolCalls;
    /**
     * Bind the emitter for the current execution.
     * Must be called before each prompt so trace events route correctly.
     */
    setEmitter(emitter: AgentEventEmitter): void;
    /** Clear emitter after execution completes. */
    clearEmitter(): void;
    /**
     * Returns Copilot SDK session hooks object.
     *
     * Attach to session creation:
     *   client.createSession({ ..., hooks: mcpHooks.getHooks() })
     */
    getHooks(): Record<string, unknown>;
}
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