import type { LoopContext } from './agent.js';
import type { AiMessage, StreamChunk, ToolCall, ToolResult } from './types.js';
/**
 * Execute the tool phase for a single agent step. Yields the same
 * `StreamChunk` sequence (`tool-call` → `tool-update*` → `tool-result`) that
 * the streaming caller surfaces to consumers. Non-streaming callers iterate
 * via `.next()` and discard yields — the side effects (message pushes,
 * pending-state mutations on `loopCtx`) are identical regardless of whether
 * the chunks reach a consumer.
 *
 * Returns the step's `ToolResult[]`. The caller passes the assistant message
 * to push before iteration so the AgentStep shape (response.message) and the
 * final `messages` array stay in sync with the loop variant.
 */
export declare function executeToolPhase(loopCtx: LoopContext, toolCalls: ToolCall[], assistantMessage: AiMessage): AsyncGenerator<StreamChunk, ToolResult[], void>;
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