/**
 * Returns the `ANTHROPIC_BASE_URL` claude resolves at runtime, or
 * `undefined` if claude has none set or the probe fails (e.g. claude
 * not on PATH). Memoized — safe to call repeatedly.
 */
export declare function discoverClaudeUpstream(): Promise<string | undefined>;
/** For tests / scripts that need to force a re-probe. */
export declare function resetClaudeUpstreamCache(): void;
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