type SpecOrPlanType = 'spec' | 'plan';
interface DeriveDefaultOutputPathArgs {
    /** The task type — only 'spec' and 'plan' derive a default output path. */
    type: SpecOrPlanType;
    /** The task prompt (used to slugify the spec filename when self-naming). */
    prompt: string;
    /** All `target.paths` entries in order; undefined/empty for inline. */
    paths?: string[] | undefined;
    /** Today's date as YYYY-MM-DD. Injected so the derivation is pure/testable. */
    today: string;
}
/**
 * Derive the default artifact output path for a spec or plan task when the caller
 * did not supply `outputPath`.
 *
 * One uniform rule keeps the whole SDLC chain on a single stem `<date>-<slug>`:
 * inherit the stem from the first date-prefixed input, skipping undated scaffolds.
 *
 *   - spec → `.mma/specs/<dated-stem>.md` when a dated input is present (the
 *            exploration); otherwise `.mma/specs/<today>-<slug>.md`
 *            (`<slug>` = first sentence of the prompt, kebab-cased, ≤60 chars;
 *            falls back to `spec` when the prompt slugifies to empty)
 *   - plan → `.mma/plans/<dated-stem>.md` when a dated input is present (the spec);
 *            otherwise `.mma/plans/<today>-<basename>.md` from the first input, or
 *            `null` when there is no input at all (inline — caller requires outputPath)
 *
 * Returns `null` when no default can be derived. The caller rejects a plan with
 * inline content and no `target.paths` with HTTP 400 before reaching derivation, so
 * the null branch is defensive.
 */
export declare function deriveDefaultOutputPath(args: DeriveDefaultOutputPathArgs): string | null;
export {};
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