import type { z } from 'zod';
/**
 * Structural fingerprint of a Zod schema (phase 181, T2).
 *
 * `ToolDef.inputSchema` is a Zod raw shape whose values are live Zod schema
 * instances (functions/prototypes) -- these cannot be `JSON.stringify`'d
 * directly. This walks the schema's internal `._def` and produces a plain,
 * JSON-serializable description: a type tag, whether the field is optional,
 * and (recursively) the element type for arrays or the sorted value set for
 * enums.
 *
 * Zod v4 represents `.optional()` as a wrapper node (`_def.type ===
 * 'optional'`, inner schema at `_def.innerType`). That wrapper is unwrapped
 * here so optionality shows up as an explicit `optional` flag on the
 * underlying type's description, rather than as its own nesting level --
 * matching "type tag + recursively-described inner/element type + enum
 * values if present + whether optional".
 */
export declare function describeZodType(schema: z.ZodTypeAny): unknown;
/**
 * Sha256 structural fingerprint of a tool's name, description, and
 * inputSchema shape. Used to bind an MCP trust-envelope grant (T3+) to the
 * exact tool definition it was granted against -- so a schema-stable-
 * looking but behavior-changed server (different description, added/
 * removed/retyped field, changed optionality) invalidates prior grants
 * (revoke-on-version-change, AC-1).
 */
export declare function computeToolDefHash(tool: {
    name: string;
    description: string;
    inputSchema: z.ZodRawShape;
}): string;
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