export type AsyncHandler<I, O> = (input: I) => Promise<O>;
/**
 * Wrap an async tool handler so every call is checked with ACP first.
 *
 *   const handler = governed("web_search", async ({ query }) => await search(query));
 *
 * If ACP denies the call, the wrapped handler returns the string
 * `"tool_error: <reason>"` so the model can see the denial and adapt.
 *
 * After execution, the result is reported to ACP for audit and post-output
 * PII scanning. If ACP returns a redacted version, the redacted version is
 * returned to the caller (pass `onRedact: "keep"` to override).
 */
export declare function governed<I, O>(toolName: string, handler: AsyncHandler<I, O>, opts?: {
    onRedact?: "replace" | "keep";
}): AsyncHandler<I, O | string>;
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