export declare const MCP_PROTOCOL_VERSION = "2025-06-18";
export declare class McpRpcError extends Error {
    readonly code?: number | undefined;
    constructor(message: string, code?: number | undefined);
}
export declare class McpTimeoutError extends Error {
}
export interface McpToolInfo {
    name: string;
    description?: string;
    inputSchema?: unknown;
}
export interface McpSpawnSpec {
    command: string;
    args: string[];
    env: Record<string, string>;
    cwd?: string;
}
/** Minimal MCP client over a child process's stdio (newline-delimited JSON). */
export declare class McpStdioClient {
    private spec;
    private child?;
    private nextId;
    private pending;
    private buf;
    private stderrTail;
    private closing;
    exited: boolean;
    exitReason?: string;
    /** Called once when the process goes away; `deliberate` = close() was called. */
    onExit?: (reason: string, deliberate: boolean) => void;
    constructor(spec: McpSpawnSpec);
    get pid(): number | undefined;
    start(timeoutMs?: number): Promise<void>;
    request(method: string, params: unknown, timeoutMs: number): Promise<unknown>;
    notify(method: string, params?: unknown): void;
    listTools(timeoutMs?: number): Promise<McpToolInfo[]>;
    /** Deliberate shutdown: SIGTERM, SIGKILL after 2 s. */
    close(): void;
    private write;
    private onData;
    private onLine;
    private fail;
}
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