import { Schema as S } from 'effect';
declare const PathResolution: S.Union<readonly [import("../schema/index.js").CallableTaggedStruct<"Found", {
    value: S.Unknown;
    atPath: S.String;
}>, import("../schema/index.js").CallableTaggedStruct<"NotFound", {
    failedAt: S.String;
    reason: S.String;
    availableKeys: S.$Array<S.String>;
}>]>;
/**
 * Result of resolving a dot-string path against a Model snapshot.
 *
 * The path representation matches `SerializedEntry.changedPaths` exactly:
 * dot-separated, anchored at the literal segment `root`. `Found.atPath`
 * echoes the canonicalized path; `NotFound.availableKeys` lists the keys
 * present at the deepest segment that resolved, so an agent can recover with
 * one follow-up call.
 */
export type PathResolution = typeof PathResolution.Type;
/**
 * Walk a dot-string path against a Model snapshot. Returns the resolved value
 * on success, or a structured `NotFound` describing the deepest segment that
 * resolved plus its available keys so an agent can refine.
 */
export declare const resolvePath: (root: unknown, path: string) => PathResolution;
/**
 * Apply structural summarization rules to a value:
 * - Arrays collapse to `{ _summary, length, sample: [head, last] }` at every depth.
 * - Records walk to a depth of 3, then collapse to `{ _summary, keys }`.
 * - Long strings collapse to `{ _summary, length, head }`.
 * - Tagged values (`{ _tag, ... }`) keep their `_tag` since it's a record key.
 *
 * The result is JSON-serializable and intended for transmission to MCP clients
 * with `expand: false`. Use raw values directly when `expand: true`.
 */
export declare const summarizeValue: (value: unknown) => unknown;
/**
 * Format a `NotFound` resolution as a single human-readable line for the
 * `ResponseError.reason` channel. Includes the available keys at the failure
 * point so an agent can refine the path on the next call.
 */
export declare const formatPathNotFound: (notFound: Extract<PathResolution, {
    _tag: "NotFound";
}>) => string;
export {};
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