/**
 * Return the effective proxy URL for an https:// request, just for diagnostic
 * output (zpl_diagnose tool, future about-style tool). Null = no proxy.
 */
export declare function detectActiveProxy(): string | null;
/**
 * Install the EnvHttpProxyAgent globally. Called at MCP boot (src/index.ts
 * main()) so every fetch() in the rest of the codebase honours proxy env
 * vars without each call site needing to know.
 *
 * Idempotent — safe to call twice.
 */
export declare function installProxyDispatcher(): void;
/** For zpl_diagnose tool / debug output. */
export declare function getActiveProxy(): string | null;