import { Schema } from "effect";
import type { Tool } from "effect/unstable/ai";
declare const errorMessage: (error: unknown) => string;
declare const appendInstructionFragment: (base: string | undefined, fragment: string | undefined) => string | undefined;
type StaticDeclaration = {
    readonly origin: import("./agent-event.js").ToolOrigin;
    readonly tool: Tool.Any;
};
/** @internal Small setup codecs and normalizers kept outside the composition root. */
export declare const SetupHelpers: {
    errorMessage: typeof errorMessage;
    appendInstructionFragment: typeof appendInstructionFragment;
    defaultProgressOverflowPolicy: {
        readonly _tag: "Backpressure";
        readonly capacity: 64;
    };
    progressOverflowPolicySchema: Schema.Union<readonly [Schema.TaggedStruct<"Backpressure", {
        readonly capacity: Schema.Finite;
    }>, Schema.TaggedStruct<"Dropping", {
        readonly capacity: Schema.Finite;
    }>, Schema.TaggedStruct<"Sliding", {
        readonly capacity: Schema.Finite;
    }>, Schema.TaggedStruct<"Fail", {
        readonly capacity: Schema.Finite;
    }>]>;
};
export type { StaticDeclaration };