import { describe, expect, test } from "bun:test"

import { Cause, Effect, Schema } from "effect"

import { CodeMode, Extension, Tool, toolError } from "../src/index.js"

const run = (tool: Tool.Tool<never>) =>

Effect.runPromise(CodeMode.make({ tools: { host: { call: tool } } }).execute("return await tools.host.call({})"))

class HostError extends Schema.TaggedError<HostError>()("HostError", {

message: Schema.String,

}) {}

describe("CodeMode host failure boundary", () => {

test("preserves explicit tool failures", async () => {

const result = await run(

Tool.make({

description: "Fail",

input: Schema.Struct({}),

output: Schema.String,

execute: () => Effect.fail(toolError("Authorized request was refused")),

}),

)

expect(result.ok ? undefined : result.error).toStrictEqual({

kind: "ToolFailure",

message: "Authorized request was refused",

})

})

test("does not rewrite explicit tool failures", async () => {

const result = await run(

Tool.make({

description: "Fail",

input: Schema.Struct({}),

output: Schema.String,

execute: () => Effect.fail(toolError("File not found: /tmp/report.json")),

}),

)

expect(result.ok ? undefined : result.error).toStrictEqual({

kind: "ToolFailure",

message: "File not found: /tmp/report.json",

})

})

test("reports failures, defects, rejected Promises, and nested causes", async () => {

for (const failure of [

Effect.fail(new HostError({ message: "Connection refused" })),

Effect.die(new Error("Connection refused")),

Effect.promise(async () => {

throw new Error("Connection refused")

}),

Effect.fail(toolError("Request failed", new Error("Connection refused"))),

Effect.failCause(Cause.combine(Cause.fail("Request failed"), Cause.die("Connection refused"))),

]) {

const result = await run(

Tool.make({

description: "Fail internally",

input: Schema.Struct({}),

output: Schema.String,

execute: () => failure,

}),

)

expect(result.ok ? undefined : result.error).toStrictEqual({

kind: "ToolFailure",

message: expect.stringContaining("Connection refused"),

})

}

})

test("reports invalid host output", async () => {

const result = await run(

Tool.make({

description: "Return invalid output",

input: Schema.Struct({}),

output: Schema.Struct({ value: Schema.String }),

execute: () => Effect.succeed({ value: 1 } as unknown as { readonly value: string }),

}),

)

expect(result.ok ? undefined : result.error).toStrictEqual({

kind: "InvalidToolOutput",

message: "Invalid output from tool 'host.call': SchemaError(Expected string\n at [\"value\"])",

})

})

test("reports host output copying errors", async () => {

const result = await run(

Tool.make({

description: "Return hostile output",

input: Schema.Struct({}),

output: Schema.Unknown,

execute: () =>

Effect.succeed(

new Proxy(

{},

{

ownKeys: () => {

throw new Error("Cannot enumerate output")

},

},

),

),

}),

)

expect(result.ok ? undefined : result.error).toStrictEqual({

kind: "InvalidToolOutput",

message: "Invalid output from tool 'host.call': Error: Cannot enumerate output",

})

})

test("caught tool failures are Error values in-program", async () => {

const result = await Effect.runPromise(

CodeMode.make({

tools: {

host: {

call: Tool.make({

description: "Refuse",

input: Schema.Struct({}),

output: Schema.String,

execute: () => Effect.fail(toolError("Refused")),

}),

},

},

}).execute(`

try {

await tools.host.call({})

return "no"

} catch (e) {

return { isError: e instanceof Error, message: e.message }

}

`),

)

expect(result.ok).toBe(true)

if (result.ok) expect(result.value).toStrictEqual({ isError: true, message: "Refused" })

})

test("propagates host interruption instead of returning a diagnostic", async () => {

const exit = await Effect.runPromiseExit(

CodeMode.make({

tools: {

host: {

call: Tool.make({

description: "Interrupt",

input: Schema.Struct({}),

output: Schema.String,

execute: () => Effect.interrupt,

}),

},

},

}).execute("return await tools.host.call({})"),

)

expect(exit._tag).toBe("Failure")

if (exit._tag === "Failure") {

expect(Cause.hasInterruptsOnly(exit.cause)).toBe(true)

}

})

})

describe("CodeMode call hooks", () => {

const ended = (result: CodeMode.CallResult) => {

if (result.status !== "failure") return result.status

return `failure:${result.error instanceof Error ? result.error.message : String(result.error)}`

}

// Every hook logs its event, so the order across tools and extensions is visible.

const observe = (events: Array<string>): CodeMode.Hooks => ({

"tool.before": (call) => Effect.sync(() => void events.push(`tool.before ${JSON.stringify(call)}`)),

"tool.after": (call, result) => Effect.sync(() => void events.push(`tool.after ${call.name} ${ended(result)}`)),

"extension.before": (call) => Effect.sync(() => void events.push(`extension.before ${JSON.stringify(call)}`)),

"extension.after": (call, result) =>

Effect.sync(() => void events.push(`extension.after ${call.name} ${ended(result)}`)),

})

test("surround the tools actually invoked, with decoded input", async () => {

const events: Array<string> = []

const lookup = Tool.make({

description: "Look up a value",

input: Schema.Struct({ query: Schema.String }),

output: Schema.String,

execute: ({ query }) => (query === "boom" ? Effect.fail(toolError("Lookup refused")) : Effect.succeed(query)),

})

const runtime = CodeMode.make({ tools: { context: { lookup } }, hooks: observe(events) })

const success = await Effect.runPromise(

runtime.execute(`

if (false) await tools.context.lookup({ query: "not called" })

return await tools.context.lookup({ query: "deployment failure" })

`),

)

expect(success).toMatchObject({ ok: true, value: "deployment failure" })

const failure = await Effect.runPromise(runtime.execute(`return await tools.context.lookup({ query: "boom" })`))

expect(failure.ok).toBe(false)

expect(events).toEqual([

'tool.before {"name":"context.lookup","input":{"query":"deployment failure"}}',

"tool.after context.lookup success",

'tool.before {"name":"context.lookup","input":{"query":"boom"}}',

"tool.after context.lookup failure:Lookup refused",

])

})

test("surround each call to an extension global, with its arguments, but not functions inside results", async () => {

const events: Array<string> = []

const runtime = CodeMode.make({

extensions: [

Extension.make({

name: "web",

globals: {

fetch: async (url: string, init?: { method?: string }) => ({

url,

method: init?.method ?? "GET",

json: () => 1,

}),

fail: () => {

throw new RangeError("nope")

},

},

}),

],

hooks: observe(events),

})

const result = await Effect.runPromise(

runtime.execute(`

const res = await fetch("https://a.test/", { method: "POST" })

res.json()

try { fail() } catch {}

return res.url

`),

)

expect(result).toMatchObject({ ok: true, value: "https://a.test/", toolCalls: [] })

expect(events).toEqual([

'extension.before {"extension":"web","name":"fetch","args":["https://a.test/",{"method":"POST"}]}',

"extension.after fetch success",

'extension.before {"extension":"web","name":"fail","args":[]}',

"extension.after fail failure:nope",

])

})

test("a failing before hook denies the call; the program catches the host's error", async () => {

const runtime = CodeMode.make({

tools: {

lookup: Tool.make({

description: "Look up",

input: Schema.Struct({}),

output: Schema.String,

execute: () => Effect.succeed("ok"),

}),

},

extensions: [Extension.make({ name: "web", globals: { fetch: async (url: string) => url } })],

hooks: { "extension.before": (call) => Effect.fail(new Error(`${call.name} is not allowed`)) },

})

expect(

await Effect.runPromise(

runtime.execute(`

const denied = await fetch("https://a.test/").catch((e) => [e instanceof Error, e.message])

return [denied, await tools.lookup({})]

`),

),

).toMatchObject({ ok: true, value: [[true, "fetch is not allowed"], "ok"] })

expect(await Effect.runPromise(runtime.execute(`await fetch("https://a.test/")`))).toMatchObject({

ok: false,

error: { kind: "ExecutionFailure", message: "Error: fetch is not allowed" },

})

const refused = CodeMode.make({

tools: {

lookup: Tool.make({

description: "Look up",

input: Schema.Struct({}),

output: Schema.String,

execute: () => Effect.succeed("ok"),

}),

},

hooks: { "tool.before": () => Effect.fail(toolError("lookup is not allowed")) },

})

expect(

await Effect.runPromise(

refused.execute(`try { await tools.lookup({}) } catch (e) { return [e.name, e.message] }`),

),

).toMatchObject({ ok: true, value: ["Error", "lookup is not allowed"], toolCalls: [{ name: "lookup" }] })

expect(await Effect.runPromise(refused.execute(`await tools.lookup({})`))).toMatchObject({

ok: false,

error: { kind: "ToolFailure", message: "lookup is not allowed" },

})

})

test("see a tool defect as the failure the program gets, and an interrupted extension call", async () => {

const events: Array<string> = []

const broken = Tool.make({

description: "Broken",

input: Schema.Struct({}),

output: Schema.String,

execute: () => Effect.die("broken"),

})

const runtime = CodeMode.make({

tools: { broken },

extensions: [Extension.make({ name: "slow", globals: { forever: () => new Promise(() => {}) } })],

hooks: observe(events),

})

expect(await Effect.runPromise(runtime.execute(`await tools.broken({})`))).toMatchObject({ ok: false })

expect(await Effect.runPromise(runtime.execute(`forever(); return "done"`))).toMatchObject({

ok: true,

value: "done",

})

expect(events).toEqual([

'tool.before {"name":"broken","input":{}}',

"tool.after broken failure:broken",

'extension.before {"extension":"slow","name":"forever","args":[]}',

"extension.after forever interrupted",

])

})

test("observes interrupted calls", async () => {

const events: Array<string> = []

const call = Tool.make({

description: "Interrupt",

input: Schema.Struct({}),

output: Schema.String,

execute: () => Effect.interrupt,

})

const exit = await Effect.runPromiseExit(

CodeMode.make({ tools: { host: { call } }, hooks: observe(events) }).execute("return await tools.host.call({})"),

)

expect(exit._tag).toBe("Failure")

expect(events).toEqual(['tool.before {"name":"host.call","input":{}}', "tool.after host.call interrupted"])

})

test("observes running calls interrupted during completion", async () => {

const events: Array<string> = []

const call = Tool.make({

description: "Pending",

input: Schema.Struct({}),

output: Schema.String,

execute: () => Effect.never,

})

const result = await Effect.runPromise(

CodeMode.make({ tools: { host: { call } }, hooks: observe(events) }).execute(

'tools.host.call({}); return "done"',

),

)

expect(result).toMatchObject({ ok: true, value: "done" })

expect(events).toEqual(['tool.before {"name":"host.call","input":{}}', "tool.after host.call interrupted"])

})

test("observes calls interrupted by the execution timeout", async () => {

const events: Array<string> = []

const call = Tool.make({

description: "Pending",

input: Schema.Struct({}),

output: Schema.String,

execute: () => Effect.never,

})

const result = await Effect.runPromise(

CodeMode.make({ tools: { host: { call } }, limits: { timeoutMs: 10 }, hooks: observe(events) }).execute(

"return await tools.host.call({})",

),

)

expect(result).toMatchObject({ ok: false, error: { kind: "TimeoutExceeded" } })

expect(events).toEqual(['tool.before {"name":"host.call","input":{}}', "tool.after host.call interrupted"])

})

})

describe("CodeMode console capture", () => {

test("captures console output as bounded result logs", async () => {

const result = await Effect.runPromise(

CodeMode.execute({

code: `

const returned = console.log("Thread info:", { name: "Demo", count: 2 })

console.warn("careful")

return returned

`,

}),

)

expect(result).toStrictEqual({

ok: true,

value: null,

logs: ['Thread info: {"name":"Demo","count":2}', "[warn] careful"],

toolCalls: [],

})

expect(Schema.decodeUnknownSync(CodeMode.Result)(JSON.parse(JSON.stringify(result)))).toStrictEqual(result)

})

test("keeps logs captured before failures", async () => {

const result = await Effect.runPromise(

CodeMode.execute({

code: `

console.log("before failure")

throw new Error("boom")

`,

}),

)

expect(result.ok ? undefined : result.logs).toStrictEqual(["before failure"])

expect(result.ok ? undefined : result.error.message).toBe("Error: boom")

})

test("prints NaN and Infinity literally instead of the JSON null", async () => {

const result = await Effect.runPromise(

CodeMode.execute({

code: `

console.log(NaN)

console.log(Infinity, -Infinity)

console.log({ ratio: NaN, bounds: [Infinity] })

return null

`,

}),

)

expect(result.ok).toBe(true)

expect(result.logs).toStrictEqual(["NaN", "Infinity -Infinity", '{"ratio":NaN,"bounds":[Infinity]}'])

})

test("renders CodeMode values nested inside logged containers", async () => {

const result = await Effect.runPromise(

CodeMode.execute({

code: `

console.log({ m: new Map([["a", 1]]), when: new Date(0), r: /ab/g, s: new Set([1, 2]) })

console.log([new Date(0)])

return null

`,

}),

)

expect(result.ok).toBe(true)

expect(result.logs).toStrictEqual([

'{"m":Map(1) [["a",1]],"when":1970-01-01T00:00:00.000Z,"r":/ab/g,"s":Set(2) [1,2]}',

"[1970-01-01T00:00:00.000Z]",

])

})

test("console formatting is total: cycles and opaque references render as markers", async () => {

const result = await Effect.runPromise(

CodeMode.execute({

code: `

const m = new Map()

m.set("self", m)

console.log({ box: m })

console.log({ fn: (x) => x, ok: 1 })

return null

`,

}),

)

expect(result.ok).toBe(true)

expect(result.logs).toStrictEqual(['{"box":Map(1) [["self",[Circular]]]}', '{"fn":[opaque reference],"ok":1}'])

})

test("console.table renders CodeMode value cells", async () => {

const result = await Effect.runPromise(

CodeMode.execute({

code: `

console.table([{ when: new Date(0), n: NaN }])

return null

`,

}),

)

expect(result.ok).toBe(true)

expect(result.logs).toStrictEqual(["(index)\twhen\tn\n0\t1970-01-01T00:00:00.000Z\tNaN"])

})

test("captures console.dir and console.table output", async () => {

const result = await Effect.runPromise(

CodeMode.execute({

code: `

console.dir({ nested: { ok: true } })

console.table([

{ name: "Kit", count: 1, hidden: "x" },

{ name: "Olive", count: 2, hidden: "y" }

], ["name", "count"])

return "done"

`,

}),

)

expect(result).toStrictEqual({

ok: true,

value: "done",

logs: ['{"nested":{"ok":true}}', "(index)\tname\tcount\n0\tKit\t1\n1\tOlive\t2"],

toolCalls: [],

})

})

})

describe("CodeMode output budget", () => {

test("absent maxOutputBytes means no truncation at all", async () => {

const result = await Effect.runPromise(

CodeMode.execute({

code: `console.log("z".repeat(50_000)); return "x".repeat(100_000)`,

}),

)

expect(result.ok).toBe(true)

if (!result.ok) return

expect(result.truncated).toBeUndefined()

expect(result.value).toBe("x".repeat(100_000))

expect(result.logs).toStrictEqual(["z".repeat(50_000)])

})

test("truncates an oversized result value with a marker instead of failing", async () => {

const limits: CodeMode.ExecutionLimits = { maxOutputBytes: 40 }

const result = await Effect.runPromise(

CodeMode.execute({

code: `return { data: "${"x".repeat(200)}" }`,

limits,

}),

)

expect(result.ok).toBe(true)

if (!result.ok) return

expect(result.truncated).toBe(true)

expect(typeof result.value).toBe("string")

expect(result.value).toMatch(

/^\{"data":"x+ \[result truncated: \d+ bytes exceeds the 40-byte output limit; return a smaller value\]$/,

)

expect(Schema.decodeUnknownSync(CodeMode.Result)(JSON.parse(JSON.stringify(result)))).toStrictEqual(result)

})

test("keeps leading logs within the remaining budget and marks the cut", async () => {

const limits: CodeMode.ExecutionLimits = { maxOutputBytes: 40 }

const result = await Effect.runPromise(

CodeMode.execute({

code: `

console.log("first line")

console.log("${"y".repeat(200)}")

return "ok"

`,

limits,

}),

)

expect(result.ok).toBe(true)

if (!result.ok) return

expect(result.value).toBe("ok")

expect(result.truncated).toBe(true)

expect(result.logs).toStrictEqual(["first line", "[logs truncated: showing 1 of 2 lines]"])

})

test("does not mark results within the budget", async () => {

const result = await Effect.runPromise(

CodeMode.execute({

code: `

console.log("fits")

return { fits: true }

`,

}),

)

expect(result).toStrictEqual({

ok: true,

value: { fits: true },

logs: ["fits"],

toolCalls: [],

})

})

})

describe("CodeMode schema flexibility", () => {

test("accepts render-only JSON Schema input and omitted output", async () => {

const observed: Array<unknown> = []

const call = Tool.make({

description: "Call an adapter-described tool",

input: {

type: "object",

properties: { id: { type: "string" }, count: { type: "number" } },

required: ["id"],

},

execute: (input) =>

Effect.sync(() => {

observed.push(input)

return { echoed: input }

}),

})

const runtime = CodeMode.make({ tools: { adapter: { call } } })

expect(runtime.catalog).toStrictEqual([

{

path: "adapter.call",

description: "Call an adapter-described tool",

signature: "tools.adapter.call({\n id: string,\n count?: number,\n}): Promise<void>",

},

])

// JSON Schema is render-only: mistyped input passes through unvalidated.

const result = await Effect.runPromise(runtime.execute(`return await tools.adapter.call({ id: 42 })`))

expect(result.ok).toBe(true)

if (result.ok) expect(result.value).toBeNull()

expect(observed).toStrictEqual([{ id: 42 }])

})

test("outbound tool arguments follow JSON serialization semantics", async () => {

const observed: Array<unknown> = []

const call = Tool.make({

description: "Observe raw input",

input: { type: "object" },

execute: (input) =>

Effect.sync(() => {

observed.push(input)

return "ok"

}),

})

const runtime = CodeMode.make({ tools: { adapter: { call } } })

const result = await Effect.runPromise(

runtime.execute(

`return await tools.adapter.call({ q: undefined, limit: 0 / 0, rate: 1 / 0, items: [1, undefined, 2], holes: [1, , 3] })`,

),

)

expect(result.ok).toBe(true)

const received = observed[0] as Record<string, unknown>

expect(received).toStrictEqual({ limit: null, rate: null, items: [1, null, 2], holes: [1, null, 3] })

// The undefined-valued property is dropped like JSON.stringify, not delivered as undefined.

expect(Object.hasOwn(received, "q")).toBe(false)

})

test("dropping undefined values lets optionalKey schemas accept conditional arguments", async () => {

const observed: Array<unknown> = []

const find = Tool.make({

description: "Find things",

input: Schema.Struct({ query: Schema.optionalKey(Schema.String), limit: Schema.optionalKey(Schema.Number) }),

execute: (input) =>

Effect.sync(() => {

observed.push(input)

return "ok"

}),

})

const runtime = CodeMode.make({ tools: { things: { find } } })

// The `cond ? value : undefined` idiom: optionalKey rejects a present undefined, so the

// JSON boundary must drop the key before the schema decodes.

const result = await Effect.runPromise(

runtime.execute(`return await tools.things.find({ query: undefined, limit: 5 })`),

)

expect(result.ok).toBe(true)

expect(observed).toStrictEqual([{ limit: 5 }])

const search = await Effect.runPromise(runtime.execute(`return (await search({ query: undefined })).items.length`))

expect(search.ok).toBe(true)

})

test("renders JSON Schema outputs and $defs references", async () => {

const lookup = Tool.make({

description: "Look up a user",

input: { type: "object", properties: { login: { type: "string" } }, required: ["login"] },

output: {

$ref: "#/$defs/User",

$defs: {

User: {

type: "object",

properties: { login: { type: "string" }, id: { type: "number" } },

required: ["login", "id"],

},

},

},

execute: () => Effect.succeed({ login: "kit", id: 7 }),

})

const runtime = CodeMode.make({ tools: { users: { lookup } } })

expect(runtime.catalog).toStrictEqual([

{

path: "users.lookup",

description: "Look up a user",

signature: "tools.users.lookup({\n login: string,\n}): Promise<{\n login: string,\n id: number,\n}>",

},

])

const result = await Effect.runPromise(runtime.execute(`return await tools.users.lookup({ login: "kit" })`))

expect(result.ok).toBe(true)

if (result.ok) expect(result.value).toStrictEqual({ login: "kit", id: 7 })

})

test("Effect Schema output without an input transform renders void when omitted", async () => {

const ping = Tool.make({

description: "Ping",

input: Schema.Struct({ host: Schema.String }),

execute: () => Effect.succeed("pong"),

})

const runtime = CodeMode.make({ tools: { net: { ping } } })

expect(runtime.catalog[0]?.signature).toBe("tools.net.ping({\n host: string,\n}): Promise<void>")

const result = await Effect.runPromise(runtime.execute(`return await tools.net.ping({ host: "example.test" })`))

expect(result.ok).toBe(true)

if (result.ok) expect(result.value).toBeNull()

})

})

describe("CodeMode public contract", () => {

const lookup = Tool.make({

description: "Look up an order by ID",

input: Schema.Struct({ id: Schema.String }),

output: Schema.Struct({ id: Schema.String, status: Schema.String }),

execute: ({ id }) => Effect.succeed({ id, status: "open" }),

})

const tools = { orders: { lookup } }

const source = `return await tools.orders.lookup({ id: "order_42" })`

test("keeps one-shot and reusable execution equivalent", async () => {

const runtime = CodeMode.make({ tools })

const [oneShot, reusable] = await Promise.all([

Effect.runPromise(CodeMode.execute({ tools, code: source })),

Effect.runPromise(runtime.execute(source)),

])

expect(reusable).toStrictEqual(oneShot)

const input: CodeMode.Input = { code: source }

expect(Schema.decodeUnknownSync(CodeMode.Input)(input)).toStrictEqual(input)

expect(Schema.decodeUnknownSync(CodeMode.Result)(JSON.parse(JSON.stringify(reusable)))).toStrictEqual(reusable)

})

test("a reused execution Effect starts from a clean slate", async () => {

const echo = Tool.make({

description: "echo",

input: Schema.Struct({}),

output: Schema.Number,

execute: () => Effect.succeed(1),

})

const effect = CodeMode.execute({

tools: { host: { echo } },

code: `console.log("hi"); return await tools.host.echo({})`,

limits: { maxToolCalls: 1 },

})

const first = await Effect.runPromise(effect)

const second = await Effect.runPromise(effect)

// Per-execution state (tool-call budget and audit list, logs, timeout bookkeeping) must

// bind at run time, so the second run neither exhausts the budget nor leaks run 1's logs.

expect(first).toStrictEqual(second)

expect(second).toStrictEqual({ ok: true, value: 1, logs: ["hi"], toolCalls: [{ name: "host.echo" }] })

})

test("describes the catalog and keeps the search built-in registered", async () => {

const runtime = CodeMode.make({ tools })

expect(runtime.catalog).toStrictEqual([

{

path: "orders.lookup",

description: "Look up an order by ID",

signature: "tools.orders.lookup({\n id: string,\n}): Promise<{\n id: string,\n status: string,\n}>",

},

])

const result = await Effect.runPromise(runtime.execute(`return search({ query: "order" })`))

expect(result.ok).toBe(true)

if (result.ok) {

expect(result.value).toStrictEqual({

items: [

{

path: "tools.orders.lookup",

description: "Look up an order by ID",

signature: "tools.orders.lookup({\n id: string,\n}): Promise<{\n id: string,\n status: string,\n}>",

},

],

remaining: 0,

next: null,

})

}

})

test("renders equivalent catalogs identically regardless of tool insertion order", () => {

const alpha = Tool.make({

description: "Alpha tool",

input: Schema.Struct({}),

output: Schema.Void,

execute: () => Effect.void,

})

const zeta = Tool.make({

description: "Zeta tool",

input: Schema.Struct({}),

output: Schema.Void,

execute: () => Effect.void,

})

const first = CodeMode.make({ tools: { zeta: { zeta, alpha }, alpha: { zeta, alpha } } })

const second = CodeMode.make({ tools: { alpha: { alpha, zeta }, zeta: { alpha, zeta } } })

expect(first.catalog).toStrictEqual(second.catalog)

expect(first.catalog.map((tool) => tool.path)).toEqual(["alpha.alpha", "alpha.zeta", "zeta.alpha", "zeta.zeta"])

})

test("renders bracket notation for tool names that are not JavaScript identifiers", async () => {

const resolveLibrary = Tool.make({

description: "Resolve a library ID",

input: Schema.Struct({ libraryName: Schema.String }),

output: Schema.String,

execute: ({ libraryName }) => Effect.succeed(`/resolved/${libraryName}`),

})

const runtime = CodeMode.make({ tools: { context7: { "resolve-library-id": resolveLibrary } } })

expect(runtime.catalog).toStrictEqual([

{

path: "context7.resolve-library-id",

description: "Resolve a library ID",

signature: 'tools.context7["resolve-library-id"]({\n libraryName: string,\n}): Promise<string>',

},

])

const search = await Effect.runPromise(runtime.execute(`return search({ query: "resolve library id" })`))

expect(search.ok).toBe(true)

if (search.ok) {

expect(search.value).toStrictEqual({

items: [

{

path: 'tools.context7["resolve-library-id"]',

description: "Resolve a library ID",

signature: 'tools.context7["resolve-library-id"]({\n libraryName: string,\n}): Promise<string>',

},

],

remaining: 0,

next: null,

})

}

const call = await Effect.runPromise(

runtime.execute(`return await tools.context7["resolve-library-id"]({ libraryName: "TypeScript" })`),

)

expect(call.ok).toBe(true)

if (call.ok) expect(call.value).toBe("/resolved/TypeScript")

const exact = await Effect.runPromise(

runtime.execute(`return search({ query: 'tools.context7["resolve-library-id"]' })`),

)

expect(exact.ok).toBe(true)

if (exact.ok) expect(exact.value).toMatchObject({ remaining: 0, next: null })

})

test("uses one ranked search returning complete tools for large catalogs", async () => {

const upload = Tool.make({

description: "Upload one readable local file to the current Discord thread",

input: Schema.Struct({ path: Schema.String }),

output: Schema.Struct({ sent: Schema.Boolean }),

execute: () => Effect.succeed({ sent: true }),

})

const generate = Tool.make({

description: "Generate an image and upload it to the current Discord thread",

input: Schema.Struct({ prompt: Schema.String }),

output: Schema.Struct({ sent: Schema.Boolean }),

execute: () => Effect.succeed({ sent: true }),

})

const runtime = CodeMode.make({

tools: { thread: { uploadFile: upload, generateImage: generate }, orders: { lookup } },

})

const result = await Effect.runPromise(

runtime.execute(`

return search({

query: "send message attachment upload file to current Discord thread",

limit: 2

})

`),

)

expect(result.ok).toBe(true)

if (!result.ok) return

expect(result.value).toStrictEqual({

items: [

{

path: "tools.thread.uploadFile",

description: "Upload one readable local file to the current Discord thread",

signature: "tools.thread.uploadFile({\n path: string,\n}): Promise<{\n sent: boolean,\n}>",

},

{

path: "tools.thread.generateImage",

description: "Generate an image and upload it to the current Discord thread",

signature: "tools.thread.generateImage({\n prompt: string,\n}): Promise<{\n sent: boolean,\n}>",

},

],

remaining: 0,

next: null,

})

expect(result.toolCalls).toStrictEqual([{ name: "search" }])

const variants = await Effect.runPromise(

runtime.execute(`

return [

search({ query: "file" }),

search({ query: "image" })

]

`),

)

expect(variants.ok).toBe(true)

if (variants.ok) {

expect((variants.value as Array<{ items: Array<{ path: string }> }>)[0]?.items[0]?.path).toBe(

"tools.thread.uploadFile",

)

expect((variants.value as Array<{ items: Array<{ path: string }> }>)[1]?.items[0]?.path).toBe(

"tools.thread.generateImage",

)

}

})

test("search is a counted tool call: it burns maxToolCalls and is observed", async () => {

const observed: Array<CodeMode.ToolInvocation> = []

const limited = CodeMode.make({

tools,

limits: { maxToolCalls: 1 },

hooks: { "tool.before": (call) => Effect.sync(() => void observed.push(call)) },

})

const result = await Effect.runPromise(limited.execute(`search({}); return search({})`))

expect(result.ok).toBe(false)

if (!result.ok) expect(result.error.kind).toBe("ToolCallLimitExceeded")

expect(observed).toEqual([{ name: "search", input: {} }])

})

test("search is an opaque, shadowable global like other built-ins", async () => {

const runtime = CodeMode.make({ tools })

expect(await Effect.runPromise(runtime.execute(`return typeof search`))).toMatchObject({ value: "function" })

// A program-level declaration shadows the global, as JS module scope does.

const shadowed = await Effect.runPromise(runtime.execute(`const search = () => "local"; return search()`))

expect(shadowed.ok).toBe(true)

if (shadowed.ok) expect(shadowed.value).toBe("local")

// The reference itself vanishes at the data boundary, as functions do in JSON.stringify.

const escaped = await Effect.runPromise(runtime.execute(`return { search }`))

expect(escaped).toMatchObject({ ok: true, value: {} })

})

test("search defaults to 10 results and resolves exact tool paths", async () => {

const tool = (index: number) =>

Tool.make({

description: `Numbered tool ${index}`,

input: Schema.Struct({ id: Schema.String }),

output: Schema.String,

execute: () => Effect.succeed("ok"),

})

const runtime = CodeMode.make({

tools: {

many: Object.fromEntries(Array.from({ length: 14 }, (_, index) => [`tool${index}`, tool(index)])),

},

})

const browse = await Effect.runPromise(runtime.execute(`return search({})`))

expect(browse.ok).toBe(true)

if (browse.ok) {

const value = browse.value as {

items: Array<{ path: string }>

remaining: number

next: { offset: number } | null

}

expect(value.items).toHaveLength(10)

expect(value.remaining).toBe(4)

expect(value.next).toStrictEqual({ offset: 10 })

}

for (const query of ["many.tool13", "tools.many.tool13"]) {

const exact = await Effect.runPromise(runtime.execute(`return search({ query: ${JSON.stringify(query)} })`))

expect(exact.ok).toBe(true)

if (exact.ok) {

expect(exact.value).toStrictEqual({

items: [

{

path: "tools.many.tool13",

description: "Numbered tool 13",

signature: "tools.many.tool13({\n id: string,\n}): Promise<string>",

},

],

remaining: 0,

next: null,

})

}

}

})

test("scopes search to one namespace and browses it alphabetically", async () => {

const simple = (description: string) =>

Tool.make({

description,

input: Schema.Struct({ id: Schema.String }),

output: Schema.String,

execute: () => Effect.succeed("ok"),

})

const runtime = CodeMode.make({

tools: {

github: { list_issues: simple("List issues"), create_issue: simple("Create an issue") },

linear: { list_issues: simple("List Linear issues") },

},

})

// Empty query + namespace browses just that namespace, alphabetical by path.

const browse = await Effect.runPromise(runtime.execute(`return search({ query: "", namespace: "github" })`))

expect(browse.ok).toBe(true)

if (browse.ok) {

const value = browse.value as { items: Array<{ path: string }>; remaining: number }

expect(value.remaining).toBe(0)

expect(value.items.map((item) => item.path)).toStrictEqual([

"tools.github.create_issue",

"tools.github.list_issues",

])

}

// A query + namespace ranks within that namespace only.

const scoped = await Effect.runPromise(runtime.execute(`return search({ query: "issues", namespace: "linear" })`))

expect(scoped.ok).toBe(true)

if (scoped.ok) {

const value = scoped.value as { items: Array<{ path: string }>; remaining: number }

expect(value.remaining).toBe(0)

expect(value.items[0]?.path).toBe("tools.linear.list_issues")

}

const prefixed = await Effect.runPromise(runtime.execute(`return search({ query: "", namespace: "tools.github" })`))

expect(prefixed.ok).toBe(true)

if (prefixed.ok) expect((prefixed.value as { items: Array<unknown> }).items).toHaveLength(2)