/**
 * stub provider — an AI SDK v3 LanguageModel that doesn't call any LLM.
 * Emits the user prompt verbatim with a marker comment so the ambient
 * runtime (MCP client, user's editor, etc.) can see what was asked and
 * execute it themselves.
 *
 * Used in two scenarios:
 * 1. Inside an MCP server context (MCP_SERVER=1) — the Claude Desktop /
 *    client session IS the LLM; calling a separate API would be wasteful.
 * 2. As the safe default when no provider is configured — gives a clear
 *    diagnostic instead of a silent failure or a cryptic auth error.
 */
import type { LanguageModelV3 } from '@ai-sdk/provider';
export declare function stubModel(): LanguageModelV3;
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