/**
 * Shared content-flattening helpers for proxy code.
 *
 * Tool results / function-call outputs come back from agents in
 * inconsistent shapes — sometimes a string, sometimes an array of
 * `{type:'text',text}` blocks, sometimes a bare object. The proxy
 * needs a flat string representation for tool log emission and
 * synthetic substitutions.
 */
/**
 * Flatten arbitrary content (string, array of blocks, or unknown
 * object) to a plain string. Used by both the Anthropic proxy
 * (`tool_result.content`) and the OpenAI Responses proxy
 * (`function_call_output.output`).
 */
export declare function flattenToText(c: unknown): string;
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