/**
 * What a report says about the file it read.
 *
 * Two fields recur in every file-reading tool's metadata, and both used to be
 * emitted in their longest possible form: the sha256 of the file, all 64
 * characters of it, and the absolute path the caller had itself just passed in.
 * Measured on a 97-token .env, the pair cost 57 tokens -- a third of the whole
 * report -- and answered nothing the shorter forms do not.
 */
/**
 * Characters of a file digest a response carries.
 *
 * The full digest is what a cache key is built from and stays inside the tool;
 * a caller uses the value only to tell one reading of a file from another, and
 * 16 hex characters are 64 bits of that. The other 48 cost 26 tokens.
 */
export declare const RESPONSE_HASH_CHARS = 16;
export declare function shortHash(digest: string): string;
/**
 * The shortest path that still identifies the file.
 *
 * An absolute Windows path costs about 25 tokens once JSON has escaped every
 * separator to a doubled backslash, since each escape is its own token. A file
 * inside the working directory is named relative to it with forward slashes;
 * anything outside stays absolute, because a ../../.. chain is neither shorter
 * nor clearer.
 */
export declare function displayPath(filePath: string): string;
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