/**
 * Natural-language `buy` chat. Runs a Vercel AI SDK ToolLoopAgent locally: it connects to the
 * AgentCard MCP server (`/mcp`, authenticated with the stored JWT), loads ALL of its tools, and
 * lets the model use any of them. Model calls go through the backend `/buy/agent/llm` gateway.
 *
 * `seed` is an optional first message auto-sent right after the banner — this is how
 * `agent-cards buy <free text>` works: the free text becomes the first turn, then the user stays
 * in the interactive loop. The chat is in-memory for the session (no server-stored conversation).
 */
export declare function buyChat(seed?: string): Promise<void>;
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