import { describe, expect, it } from "@effect/vitest";import { ToolResult, isToolResult } from "./tool-result"; describe("ToolResult", () => {  it("ok wraps a value", () => {    const r = ToolResult.ok({ count: 3 });    expect(r).toEqual({ ok: true, data: { count: 3 } });    expect(isToolResult(r)).toBe(true);  });   it("fail wraps a ToolError", () => {    const r = ToolResult.fail({      code: "upstream_http_error",      status: 404,      message: "Not found",      details: { id: "x" },    });    expect(r).toEqual({      ok: false,      error: {        code: "upstream_http_error",        status: 404,        message: "Not found",        details: { id: "x" },      },    });    expect(isToolResult(r)).toBe(true);  });   it("isToolResult rejects unrelated shapes", () => {    expect(isToolResult(null)).toBe(false);    expect(isToolResult({})).toBe(false);    expect(isToolResult({ ok: true })).toBe(false);    expect(isToolResult({ ok: false })).toBe(false);    expect(isToolResult({ ok: false, error: {} })).toBe(false);    expect(isToolResult({ ok: false, error: { code: 1, message: "x" } })).toBe(false);    expect(isToolResult({ ok: "yes", data: 1 })).toBe(false);  });   it("isToolResult accepts both branches of the union", () => {    expect(isToolResult({ ok: true, data: 1 })).toBe(true);    expect(isToolResult({ ok: true, data: null })).toBe(true);    expect(      isToolResult({        ok: false,        error: { code: "x", message: "y" },      }),    ).toBe(true);  });});