export interface EnvelopeFields {
    run: string;
    from: string;
    to: string;
    task: string;
    id: string;
}
/** Decides whether a head's task tag is authentic: (sender, subject, taskId) => ok. */
export type EnvelopeVerify = (from: string, subject: string, task: string) => boolean;
export declare const envelopeDirFor: (orgDir: string) => string;
/** The org's MAC key, created on first use (0600) and stable across runs and resumes. */
export declare function loadEnvelopeKey(orgDir: string): Buffer;
export declare function envelopeMac(key: Buffer, f: EnvelopeFields): string;
/** Makes every routing tag in agent text inert: `[task:x]` becomes `(task:x)`. */
export declare function neutralizeTags(text: string): string;
/** The sealed subject suffix for a task route. */
export declare function sealTag(key: Buffer, f: EnvelopeFields): string;
/** A verifier for the mail `me` receives in `run`. */
export declare function envelopeVerifier(key: Buffer, run: string, me: string): EnvelopeVerify;
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