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TypeScript
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180import { describe, expect, test } from "bun:test"import { Effect, Schema } from "effect"import { CodeMode, Tool } from "../src/index.js"
// Key enumeration: Object.keys and for...in share one surface over plain objects, arrays// (index strings), and tool references (namespace/tool names from the supplied tools), so a// model can discover what it may call instead of guessing names from the instructions. The// motivating transcript: `Object.keys(tools)` failed with the generic plain-objects-only// message and `for (const key in tools)` was unsupported syntax, forcing blind guesses.
const echo = (description: string) => Tool.make({ description, input: Schema.Struct({ value: Schema.String }), output: Schema.String, execute: ({ value }) => Effect.succeed(value), })
const tools = { github: { list_issues: echo("List issues"), get_issue: echo("Get one issue") }, memory: { search: echo("Search memory") }, playwright: { navigate: echo("Navigate somewhere") },}
const run = (code: string) => Effect.runPromise(CodeMode.execute({ tools, code }))const value = async (code: string) => { const result = await run(code) if (!result.ok) throw new Error(`expected success, got ${result.error.kind}: ${result.error.message}`) return result.value}const error = async (code: string) => { const result = await run(code) if (result.ok) throw new Error(`expected failure, got value ${JSON.stringify(result.value)}`) return result.error}
describe("Object.keys over tool references", () => { test("enumerates top-level namespaces (the transcript program)", async () => { expect( await value(` const namespaces = Object.keys(tools) return { namespaces, count: namespaces.length } `), ).toEqual({ namespaces: ["github", "memory", "playwright"], count: 3 }) })
test("enumerates tool names at a nested namespace", async () => { expect(await value(`return Object.keys(tools.github)`)).toEqual(["list_issues", "get_issue"]) })
test("a callable tool is a leaf and enumerates as []", async () => { expect(await value(`return Object.keys(tools.github.list_issues)`)).toEqual([]) })
test("search is a global built-in function", async () => { expect(await value(`return typeof search`)).toBe("function") })
test("an unknown namespace is an UnknownTool error", async () => { const failure = await error(`return Object.keys(tools.nonexistent)`) expect(failure.kind).toBe("UnknownTool") expect(failure.message).toContain("Unknown tool namespace 'nonexistent'") })
test("Object.values/entries on a tool reference explain the working idioms", async () => { for (const method of ["values", "entries"] as const) { const failure = await error(`return Object.${method}(tools)`) expect(failure.kind).toBe("InvalidDataValue") expect(failure.message).toContain( `Object.${method}(...) cannot read tool references: they are not plain data. Use Object.keys(tools) for names, or search({ query }) for signatures.`, ) } const nested = await error(`return Object.entries(tools.github)`) expect(nested.message).toContain("Use Object.keys(tools) for names") })})
describe("Object.keys over arrays", () => { test("returns index strings, like JS", async () => { expect(await value(`return Object.keys(["a", "b", "c"])`)).toEqual(["0", "1", "2"]) expect(await value(`return Object.keys([])`)).toEqual([]) })
test("objects keep their own enumerable keys", async () => { expect(await value(`return Object.keys({ a: 1, b: 2 })`)).toEqual(["a", "b"]) })
test("non-object inputs follow ToObject, and nullish inputs name what was received", async () => { expect( await value(`return [Object.keys("ab"), Object.entries(42), Object.keys(() => 1), Object.keys(true)]`), ).toEqual([["0", "1"], [], [], []]) expect(await value(`try { Object.values(null) } catch (e) { return [e.name, e.message] }`)).toEqual([ "TypeError", "Object.values(...) cannot convert null to an object.", ]) expect((await error(`return Object.keys(tools.github.list_issues({ value: "x" }))`)).message).toContain( "received an un-awaited Promise", ) expect(await value(`const { a, size } = new Map(); return [a, size]`)).toEqual([null, 0]) expect((await error(`return Array.from(7)`)).message).toContain("received a number.") expect(await value(`return [(() => 1).x, Object.keys(() => 1)]`)).toEqual([null, []]) })})
describe("for...in", () => { test("iterates own enumerable keys of a plain object with break/continue", async () => { expect( await value(` const seen = [] for (const key in { a: 1, b: 2, c: 3, d: 4 }) { if (key === "b") continue if (key === "d") break seen.push(key) } return seen `), ).toEqual(["a", "c"]) })
test("iterates index strings over arrays", async () => { expect( await value(` const indexes = [] for (const i in ["x", "y", "z"]) { if (i === "2") break indexes.push(i) } return indexes `), ).toEqual(["0", "1"]) })
test("supports let declarations and bare identifiers", async () => { expect( await value(` let last = "" for (let key in { a: 1, b: 2 }) last = key return last `), ).toBe("b") expect( await value(` let key = "before" for (key in { only: 1 }) {} return key `), ).toBe("only") })
test("enumerates namespaces and tools from the supplied tools", async () => { expect( await value(` const names = [] for (const ns in tools) { for (const name in tools[ns]) names.push(ns + "." + name) } return names `), ).toEqual(["github.list_issues", "github.get_issue", "memory.search", "playwright.navigate"]) })
test("non-object values enumerate like JS: strings by index, everything else nothing", async () => { expect( await value(` const out = [] for (const key in "ab") out.push(key) for (const key in 42) out.push(key) for (const key in null) out.push(key) for (const key in undefined) out.push(key) for (const key in new Map([[1, 2]])) out.push(key) for (const key in Math) out.push(key) return out `), ).toEqual(["0", "1"]) expect((await error(`for (const key in tools.github.list_issues({ value: "x" })) {}`)).message).toContain( "un-awaited Promise", ) })})