packages/codemode/src/tool-runtime.ts
Rama dev · réplica de lectura del repositorio original.
import { Cause, Effect, Exit, Formatter, Schema } from "effect"
import type { Json } from "./data.js"
import type { DiagnosticKind } from "./codemode.js"
import { toolError } from "./tool-error.js"
import {
decodeInput as decodeToolInput,
decodeOutput as decodeToolOutput,
identifierSegment,
inputProperties,
inputTypeScript,
isEmptyInput,
outputTypeScript,
stringParameter,
} from "./tool-schema.js"
import { isNamespace, type Namespace } from "./namespace.js"
import { type Durable, type Idempotent, isTool, type Tool, type ToolContext } from "./tool.js"
import type { Tools } from "./tools.js"
export const compareText = (left: string, right: string) => (left < right ? -1 : left > right ? 1 : 0)
export type Services<T> = ServicesOf<T, []>
type ServicesOf<T, Depth extends ReadonlyArray<unknown>> = Depth["length"] extends 8
? never
: T extends {
readonly _tag: "CodeModeTool"
readonly execute: (input: unknown, context?: ToolContext) => Effect.Effect<unknown, unknown, infer R>
}
? R
: T extends object
? string extends keyof T
? ServicesOf<T[string], [...Depth, unknown]>
: ServicesOf<T[keyof T], [...Depth, unknown]>
: never
export type ToolCall = {
readonly name: string
}
/** A tool call the program is making, with its decoded input. */
export type ToolInvocation = {
readonly name: string
readonly input: unknown
/** The call's idempotency key, `<runId>:<callId>`: the same at every hook, and across a suspended run's resumes. */
readonly key: string
}
/**
* A call the program is making to an extension global or module function, with its arguments. A module function is
* named by its path from the module, such as `fs.readFile`.
*/
export type ExtensionInvocation = {
readonly extension: string
readonly name: string
readonly args: ReadonlyArray<unknown>
}
/** How a call ended; `after` hooks observe it and cannot change it. */
export type CallResult =
| { readonly status: "success"; readonly value: unknown }
| { readonly status: "failure"; readonly error: unknown }
| { readonly status: "interrupted" }
/** Hooks around every call the program makes into the host. A failing `before` denies the call. */
export type Hooks<R = never> = {
readonly "tool.before"?: ((call: ToolInvocation) => Effect.Effect<void, unknown, R>) | undefined
readonly "tool.after"?: ((call: ToolInvocation, result: CallResult) => Effect.Effect<void, never, R>) | undefined
readonly "extension.before"?: ((call: ExtensionInvocation) => Effect.Effect<void, unknown, R>) | undefined
readonly "extension.after"?:
| ((call: ExtensionInvocation, result: CallResult) => Effect.Effect<void, never, R>)
| undefined
}
/** Runs `before`, then `run`, then `after` with how it ended, including when interrupted (unless `detaching`). */
export const hooked = <Call, A, R>(
call: Call,
before: ((call: Call) => Effect.Effect<void, unknown, R>) | undefined,
after: ((call: Call, result: CallResult) => Effect.Effect<void, never, R>) | undefined,
run: Effect.Effect<A, unknown, R>,
detaching?: () => boolean,
): Effect.Effect<A, unknown, R> => {
const observed =
after === undefined
? run
: Effect.onExit(run, (exit) => {
if (detaching?.()) return Effect.void
if (Exit.isSuccess(exit)) return after(call, { status: "success", value: exit.value })
if (Cause.hasInterruptsOnly(exit.cause)) return after(call, { status: "interrupted" })
return after(call, { status: "failure", error: Cause.squash(exit.cause) })
})
return before === undefined ? observed : Effect.andThen(before(call), observed)
}
export type ToolDescription = {
readonly path: string
readonly description: string
readonly signature: string
}
const defaultSearchLimit = 10
const PositiveInt = Schema.Int.check(Schema.isGreaterThan(0))
const NonNegativeInt = Schema.Int.check(Schema.isGreaterThanOrEqualTo(0))
const SearchInput = Schema.Struct({
query: Schema.optionalKey(Schema.String),
namespace: Schema.optionalKey(Schema.String),
limit: Schema.optionalKey(PositiveInt),
offset: Schema.optionalKey(NonNegativeInt),
})
const SearchItem = Schema.Struct({
path: Schema.String,
description: Schema.String,
signature: Schema.String,
})
const SearchOutput = Schema.Struct({
items: Schema.Array(SearchItem),
remaining: NonNegativeInt,
next: Schema.NullOr(Schema.Struct({ offset: NonNegativeInt })),
})
export const toolExpression = (path: string) =>
"tools" +
path
.split(".")
.map((segment) => (identifierSegment.test(segment) ? `.${segment}` : `[${JSON.stringify(segment)}]`))
.join("")
export class ToolReference {
constructor(readonly path: ReadonlyArray<string>) {}
}
// Dots in tool names are namespace separators; the last tool for a canonical path wins.
type ToolNode<R> = {
tool?: Tool<R>
namespace?: Namespace<R>
readonly children: Map<string, ToolNode<R>>
}
const toolTrie = <R>(tools: Tools<R>): ToolNode<R> => {
const root: ToolNode<R> = { children: new Map() }
const insert = (node: ToolNode<R>, group: Tools<R>): void => {
for (const [name, value] of Object.entries(group)) {
let current = node
for (const segment of name.split(".")) {
if (segment === "") throw new TypeError(`Tool name '${name}' contains an empty segment.`)
const child = current.children.get(segment) ?? { children: new Map() }
current.children.set(segment, child)
current = child
}
if (isTool<R>(value)) current.tool = value
else if (isNamespace<R>(value)) {
current.namespace = value
insert(current, value.tools)
} else insert(current, value)
}
}
insert(root, tools)
return root
}
const canonicalSegments = (path: ReadonlyArray<string>): ReadonlyArray<string> =>
path.flatMap((segment) => segment.split("."))
type VisibleTool<R> = {
readonly path: string
readonly tool: Tool<R>
readonly namespaces: ReadonlyArray<Namespace<R>>
}
const flattenTools = <R>(
node: ToolNode<R>,
path: ReadonlyArray<string> = [],
namespaces: ReadonlyArray<Namespace<R>> = [],
): Array<VisibleTool<R>> => {
const next = node.namespace === undefined ? namespaces : [...namespaces, node.namespace]
return [
...(node.tool === undefined ? [] : [{ path: path.join("."), tool: node.tool, namespaces: next }]),
...Array.from(node.children).flatMap(([name, child]) => flattenTools(child, [...path, name], next)),
]
}
const describeTool = <R>(visible: VisibleTool<R>): ToolDescription => {
let signature: string | undefined
return {
path: visible.path,
description: visible.tool.description,
get signature() {
// Search ranks paths and descriptions first; only returned matches need their schemas rendered.
// Joining the final fragments avoids retaining the rendering's intermediate string ropes in JSC.
return (signature ??= [
toolExpression(visible.path),
stringParameter(visible.tool)?.signature ??
(isEmptyInput(visible.tool) ? "()" : `(${inputTypeScript(visible.tool, true)})`),
`: Promise<${outputTypeScript(visible.tool, true)}>`,
].join(""))
},
}
}
/** Tools indexed once per runtime, with discovery materialized on demand. */
export type Prepared<R = never> = {
readonly root: ToolNode<R>
readonly catalog: ReadonlyArray<ToolDescription>
readonly searchIndex: ReadonlyArray<SearchEntry>
}
export type SearchEntry = {
readonly description: ToolDescription
/** Position in the full search index, for scoring through the word index. */
readonly position: number
/** The tool's searchable text by field, read when the word index is built. */
readonly text: () => Readonly<Record<SearchField, ReadonlyArray<string>>>
/** Words in the tool's own name (the last path segment). */
readonly nameLength: number
}
type SearchField = "namespace" | "name" | "description" | "parameters" | "namespaceDescription"
// Standard field-weighted BM25 (k1 1.2, b 0.75) plus a preference for short names. Compared against other rankers on
// model-written and real search queries over an ~11k-tool catalog (anomalyco/evals, dumber/evals/tool-search).
const fieldWeights: Record<SearchField, number> = {
name: 3,
namespace: 2,
description: 1,
namespaceDescription: 0.4,
parameters: 0.3,
}
const searchFields = Object.keys(fieldWeights) as ReadonlyArray<SearchField>
const k1 = 1.2
const lengthNormalization = 0.75
/** score × (1 + brevityBoost / words in the tool name): "users" prefers `list_users` over `list_user_groups`. */
const brevityBoost = 0.5
/** A query word of 4+ letters also matches longer words it starts with, at this weight: `term` → `terminal`. */
const prefixWeight = 0.3
/** Words split at case changes and non-alphanumerics: `listUserGroups` → list, user, groups. */
const splitWords = (text: string): Array<string> =>
text
.replace(/([a-z0-9])([A-Z])/g, "$1 $2")
.toLowerCase()
.split(/[^a-z0-9]+/)
.filter((word) => word.length > 0)
/** Plural endings only, applied the same everywhere: `settings` → `setting`, `statuses` → `status`, `vms` → `vm`. */
const stem = (word: string) => {
if (word.length > 4 && word.endsWith("ies")) return word.slice(0, -3) + "y"
if (word.length > 4 && /(?:ss|sh|ch|x|z|us)es$/.test(word)) return word.slice(0, -2)
if (word.length > 2 && word.endsWith("s") && !/(?:ss|us|is)$/.test(word)) return word.slice(0, -1)
return word
}
/** Searchable words of a text: its split words, plus each camelCase word whole (`CronJob` → cron, job, cronjob). */
const searchWords = (text: string) =>
splitWords(text)
.concat((text.match(/[A-Za-z0-9]*[a-z0-9][A-Z][A-Za-z0-9]*/g) ?? []).map((word) => word.toLowerCase()))
.map(stem)
const fieldWords = (text: string, cache: Map<string, ReadonlyArray<string>>) => {
const cached = cache.get(text)
if (cached) return cached
const words = searchWords(text)
cache.set(text, words)
return words
}
/** For each word, the tools containing it and their field-weighted, length-normalized term frequency. */
type WordIndex = {
readonly postings: ReadonlyMap<string, { readonly positions: Int32Array; readonly weights: Float32Array }>
readonly documents: number
/** Sorted indexed words, for partial-word matching. */
readonly words: ReadonlyArray<string>
}
// Built once per search index on the first query.
const wordIndexes = new WeakMap<ReadonlyArray<SearchEntry>, WordIndex>()
// Locations with the same tools (global MCP servers) share one word index, keyed by a hash of the indexed text. An
// index lives while some search index uses it; once none does it can be collected and its key is removed. A hash
// collision (about 1 in 37 trillion with 1,000 distinct catalogs alive) would only misrank results: they still come
// from the caller's own tools, and the tool count in the key keeps positions in range.
const shared =
typeof WeakRef === "undefined" || typeof FinalizationRegistry === "undefined"
? undefined
: {
indexes: new Map<string, WeakRef<WordIndex>>(),
cleanup: new FinalizationRegistry<{ key: string; ref: WeakRef<WordIndex> }>(({ key, ref }) => {
// A newer index may have been stored under the same key since this one was dropped.
if (shared?.indexes.get(key) === ref) shared.indexes.delete(key)
}),
}
const wordIndexFor = (index: ReadonlyArray<SearchEntry>): WordIndex => {
const cached = wordIndexes.get(index)
if (cached) return cached
const texts = index.map((entry) => entry.text())
const key = shared ? textKey(texts) : undefined
const reused = key === undefined ? undefined : shared?.indexes.get(key)?.deref()
if (reused) {
wordIndexes.set(index, reused)
return reused
}
const built = buildWordIndex(texts)
wordIndexes.set(index, built)
if (shared && key !== undefined) {
const ref = new WeakRef(built)
shared.indexes.set(key, ref)
shared.cleanup.register(built, { key, ref })
}
return built
}
/** Tool count plus two independent 32-bit FNV-1a hashes of every indexed field, in index order. */
const textKey = (texts: ReadonlyArray<Readonly<Record<SearchField, ReadonlyArray<string>>>>) => {
let first = 0x811c9dc5
let second = 0x9e3779b9
const add = (text: string) => {
for (let i = 0; i < text.length; i++) {
const code = text.charCodeAt(i)
first = Math.imul(first ^ code, 0x01000193)
second = Math.imul(second ^ code, 0x5bd1e995)
second ^= second >>> 15
}
// Separators keep field boundaries distinct: ["ab", "c"] and ["a", "bc"] hash differently.
first = Math.imul(first ^ 0x1f, 0x01000193)
second = Math.imul(second ^ 0x1f, 0x5bd1e995)
}
for (const text of texts)
for (const field of searchFields) {
for (const part of text[field]) add(part)
add("\u0000")
}
return `${texts.length}:${(first >>> 0).toString(36)}:${(second >>> 0).toString(36)}`
}
const buildWordIndex = (texts: ReadonlyArray<Readonly<Record<SearchField, ReadonlyArray<string>>>>): WordIndex => {
// Field texts are split once here and dropped afterwards; descriptions repeat across tools, so each text is split
// once and shared while building.
const cache = new Map<string, ReadonlyArray<string>>()
const words = (texts: ReadonlyArray<string>) => texts.flatMap((text) => fieldWords(text, cache))
const fields = texts.map((text) => {
return {
namespace: words(text.namespace),
name: words(text.name),
description: words(text.description),
parameters: words(text.parameters),
namespaceDescription: words(text.namespaceDescription),
}
})
const averageLength = Object.fromEntries(
searchFields.map((field) => [
field,
fields.reduce((sum, entry) => sum + entry[field].length, 0) / texts.length || 1,
]),
) as Record<SearchField, number>
const building = new Map<string, { positions: Array<number>; weights: Array<number> }>()
const weights = new Map<string, number>()
fields.forEach((entry, position) => {
weights.clear()
for (const field of searchFields) {
const weight =
fieldWeights[field] /
(1 - lengthNormalization + (lengthNormalization * entry[field].length) / averageLength[field])
for (const word of entry[field]) weights.set(word, (weights.get(word) ?? 0) + weight)
}
for (const [word, weight] of weights) {
let posting = building.get(word)
if (!posting) building.set(word, (posting = { positions: [], weights: [] }))
posting.positions.push(position)
posting.weights.push(weight)
}
})
const postings = new Map(
[...building].map(([word, posting]) => [
word,
{ positions: Int32Array.from(posting.positions), weights: Float32Array.from(posting.weights) },
]),
)
return { postings, documents: texts.length, words: [...postings.keys()].sort() }
}
/** Indexed words longer than a 4+ letter query word that start with it. */
const prefixMatches = (words: WordIndex, term: string): Array<readonly [string, number]> => {
if (term.length < 4) return []
let low = 0
let high = words.words.length
while (low < high) {
const middle = (low + high) >> 1
if (words.words[middle]! < term) low = middle + 1
else high = middle
}
const matches: Array<readonly [string, number]> = []
for (let i = low; i < words.words.length && words.words[i]!.startsWith(term); i++)
if (words.words[i] !== term) matches.push([words.words[i]!, prefixWeight])
return matches
}
const rank = (
entries: ReadonlyArray<SearchEntry>,
query: string,
index: ReadonlyArray<SearchEntry>,
): Array<SearchEntry> => {
const terms = searchWords(query)
if (terms.length === 0)
return [...entries].sort((left, right) => compareText(left.description.path, right.description.path))
const words = wordIndexFor(index)
const allowed = entries === index ? undefined : new Set(entries.map((entry) => entry.position))
const scores = new Map<number, number>()
for (const term of terms) {
// Each tool counts a query word once, through its best-scoring match.
const best = new Map<number, number>()
for (const [word, factor] of [[term, 1] as const, ...prefixMatches(words, term)]) {
const posting = words.postings.get(word)
if (!posting) continue
const idf = Math.log(1 + (words.documents - posting.positions.length + 0.5) / (posting.positions.length + 0.5))
for (let i = 0; i < posting.positions.length; i++) {
const position = posting.positions[i]!
if (allowed && !allowed.has(position)) continue
const weight = posting.weights[i]!
const score = (factor * idf * weight * (k1 + 1)) / (weight + k1)
if (score > (best.get(position) ?? 0)) best.set(position, score)
}
}
for (const [position, score] of best) scores.set(position, (scores.get(position) ?? 0) + score)
}
return [...scores]
.map(([position, score]) => ({
entry: index[position]!,
score: score * (1 + brevityBoost / Math.max(1, index[position]!.nameLength)),
}))
.sort(
(left, right) =>
right.score - left.score || compareText(left.entry.description.path, right.entry.description.path),
)
.map(({ entry }) => entry)
}
const makeSearchTool = (searchIndex: ReadonlyArray<SearchEntry>): Tool => ({
_tag: "CodeModeTool",
description: "Search available tools",
input: SearchInput,
output: SearchOutput,
execute: (input) =>
Effect.sync(() => {
const request = input as typeof SearchInput.Type
const query = request.query ?? ""
const offset = request.offset ?? 0
let ns = request.namespace
if (ns !== undefined && !searchIndex.some((entry) => entry.description.path.startsWith("tools."))) {
if (ns === "tools") ns = undefined
else if (ns.startsWith("tools.")) ns = ns.slice("tools.".length)
}
const scoped =
ns === undefined
? searchIndex
: searchIndex.filter((entry) => entry.description.path === ns || entry.description.path.startsWith(`${ns}.`))
const trimmed = query.trim()
const pathQuery = trimmed.startsWith("tools.") ? trimmed.slice("tools.".length) : trimmed
const exact =
pathQuery === ""
? undefined
: scoped.find(
(entry) => entry.description.path === pathQuery || toolExpression(entry.description.path) === trimmed,
)
const ranked = exact !== undefined ? [exact] : rank(scoped, pathQuery, searchIndex)
const items = ranked.slice(offset, offset + (request.limit ?? defaultSearchLimit)).map(({ description }) => ({
...description,
path: toolExpression(description.path),
}))
const remaining = Math.max(0, ranked.length - offset - items.length)
return {
items,
remaining,
next: remaining > 0 ? { offset: offset + items.length } : null,
}
}),
})
/** Exact callable signature of the built-in `search` function, for host-owned instructions. */
export const searchSignature = (() => {
const tool = makeSearchTool([])
return `search(${inputTypeScript(tool, true)}): ${outputTypeScript(tool, true)}`
})()
const toSearchEntry = <R>(visible: VisibleTool<R>, position: number): SearchEntry => {
const segments = visible.path.split(".")
const name = segments.at(-1) ?? ""
return {
description: describeTool(visible),
position,
text: () => ({
namespace: segments.slice(0, -1),
name: [name],
description: [visible.tool.description],
// Parameter names only: their descriptions are half of all words and didn't improve ranking.
parameters: inputProperties(visible.tool).map((property) => property.name),
namespaceDescription: visible.namespaces.map((namespace) => namespace.description ?? ""),
}),
nameLength: splitWords(name).length,
}
}
export const prepare = <R>(tools: Tools<R>): Prepared<R> => {
const root = toolTrie(tools)
let searchIndex: ReadonlyArray<SearchEntry> | undefined
let catalog: ReadonlyArray<ToolDescription> | undefined
return {
root,
get catalog() {
return (catalog ??= this.searchIndex.map((entry) => entry.description))
},
get searchIndex() {
// Executing known tools only needs the trie. Render discovery when it is actually read,
// ordering after canonical-path collisions settle so instruction bytes stay deterministic.
return (searchIndex ??= flattenTools(root)
.sort((left, right) => compareText(left.path, right.path))
.map(toSearchEntry))
},
}
}
const lookup = <R>(root: ToolNode<R>, segments: ReadonlyArray<string>): ToolNode<R> | undefined =>
segments.reduce<ToolNode<R> | undefined>((node, segment) => node?.children.get(segment), root)
const namespaceKeys = <R>(root: ToolNode<R>, path: ReadonlyArray<string>): ReadonlyArray<string> => {
const segments = canonicalSegments(path)
const node = lookup(root, segments)
if (node === undefined) {
throw new ToolRuntimeError("UnknownTool", `Unknown tool namespace '${segments.join(".")}'.`)
}
return Array.from(node.children.keys())
}
const resolve = <R>(root: ToolNode<R>, path: ReadonlyArray<string>, index: ReadonlyArray<SearchEntry>): Tool<R> => {
const segments = canonicalSegments(path)
const node = lookup(root, segments)
if (node === undefined) {
const name = segments.join(".")
const ns = segments.length > 1 && root.children.has(segments[0]) ? segments[0] : undefined
const closest = rank(
ns ? index.filter((entry) => entry.description.path.startsWith(`${ns}.`)) : index,
ns ? segments.slice(1).join(" ") : name,
index,
)[0]
throw new ToolRuntimeError(
"UnknownTool",
closest
? `Unknown tool '${name}'. Did you mean ${toolExpression(closest.description.path)}?`
: `Unknown tool '${name}'.`,
["Use search to find available tools."],
)
}
if (node.tool === undefined) {
throw new ToolRuntimeError("UnknownTool", `Tool '${segments.join(".")}' is not callable.`)
}
return node.tool
}
export class ToolRuntimeError extends Error {
constructor(
readonly kind: Extract<
DiagnosticKind,
"UnknownTool" | "InvalidToolInput" | "InvalidToolOutput" | "ToolCallLimitExceeded"
>,
message: string,
readonly suggestions: ReadonlyArray<string> = [],
) {
super(message)
this.name = "ToolRuntimeError"
}
}
export type ExecuteCallOptions = {
readonly key?: string | undefined
readonly admit?: ((name: string) => void) | undefined
readonly detaching?: (() => boolean) | undefined
}
/** The tool bridge of one execution. Arguments arrive and results leave as JSON; program values never enter. */
export type ToolRuntime<R = never> = {
readonly calls: Array<ToolCall>
readonly hooks: Hooks<R>
readonly invocations: Map<string, ToolInvocation>
readonly record: (name: string) => void
readonly execute: (
path: ReadonlyArray<string>,
args: Array<Json | undefined>,
options?: ExecuteCallOptions,
) => Effect.Effect<Json | undefined, unknown, R>
readonly search: (
args: Array<Json | undefined>,
options?: ExecuteCallOptions,
) => Effect.Effect<Json | undefined, unknown, R>
readonly keys: (path: ReadonlyArray<string>) => ReadonlyArray<string>
/** How the tool at `path` executes on suspend (`undefined` when unknown or plain). */
readonly mode: (
path: ReadonlyArray<string>,
) => Idempotent<unknown, unknown, R> | Durable<unknown, unknown, R> | undefined
/** Admits a call to a durable tool, runs `tool.before`, and starts its work under `key`: its JSON data. */
readonly start: (
path: ReadonlyArray<string>,
args: Array<Json | undefined>,
key: string,
admit?: (name: string) => void,
) => Effect.Effect<Json, unknown, R>
/**
* Waits for a durable tool's running work: its output, as `execute` gives it. `detaching` says whether an
* interruption detaches to suspend the run, which `tool.after` doesn't see, or ends the call, which it sees as
* interrupted.
*/
readonly wait: (
path: ReadonlyArray<string>,
args: Array<Json | undefined>,
key: string,
data: Json,
detaching: () => boolean,
) => Effect.Effect<Json | undefined, unknown, R>
/** Cancels a durable tool's started work when the run is interrupted or ends. */
readonly cancel: (path: ReadonlyArray<string>, data: Json) => Effect.Effect<void, unknown, R>
}
/** Per-execution call state over tools prepared once for the runtime. */
export const make = <R>(
prepared: Prepared<R>,
maxToolCalls: number | undefined,
hooks: Hooks<R> = {},
): ToolRuntime<R> => {
const calls: Array<ToolCall> = []
const invocations = new Map<string, ToolInvocation>()
const root = prepared.root
const runId = crypto.randomUUID()
let nextCallId = 0
const recordCall = (call: ToolCall): void => {
if (maxToolCalls !== undefined && calls.length >= maxToolCalls) {
throw new ToolRuntimeError("ToolCallLimitExceeded", `Execution exceeded its tool-call limit of ${maxToolCalls}.`)
}
calls.push(call)
}
const decode = (name: string, tool: Tool<R>, args: Array<Json | undefined>) =>
Effect.gen(function* () {
const normalized = args.length === 0 ? [{}] : args
if (normalized.length !== 1)
throw new ToolRuntimeError("InvalidToolInput", `Tool '${name}' expects at most one input object.`)
const input = normalized[0]
const field = typeof input === "string" ? stringParameter(tool)?.name : undefined
return yield* Effect.try({
try: () => decodeToolInput(tool, field === undefined ? input : { [field]: input }),
catch: (cause) =>
new ToolRuntimeError(
"InvalidToolInput",
`Invalid input for tool '${name}': ${String(cause)}`,
name === "search" ? [] : ["The signature may have changed. Use search to get the current signature."],
),
})
})
// A tool's own failure becomes a ToolError; interruption passes through.
const failure = <A>(effect: Effect.Effect<A, unknown, R>) =>
effect.pipe(
Effect.catchCause((cause) => {
if (Cause.hasInterruptsOnly(cause)) return Effect.interrupt
return Effect.fail(
toolError(
Cause.prettyErrors(cause)
.map((error) => (error.cause ? Formatter.format(error) : error.message || error.name))
.join("\n"),
),
)
}),
)
// The same round trip a tool result would take through text: exact JSON.stringify semantics.
const output = (name: string, tool: Tool<R>, raw: unknown) =>
Effect.try({
try: (): Json | undefined => {
const text = JSON.stringify(decodeToolOutput(tool, raw))
return text === undefined ? undefined : JSON.parse(text)
},
catch: (cause) => new ToolRuntimeError("InvalidToolOutput", `Invalid output from tool '${name}': ${cause}`),
})
const executeTool = (name: string, tool: Tool<R>, args: Array<Json | undefined>, options?: ExecuteCallOptions) =>
Effect.gen(function* () {
const key = options?.key ?? `${runId}:${nextCallId++}`
const input = yield* decode(name, tool, args)
const admit = options?.admit
yield* Effect.sync(() => (admit !== undefined ? admit(name) : recordCall({ name })))
return yield* hooked(
{ name, input, key },
hooks["tool.before"],
hooks["tool.after"],
Effect.gen(function* () {
const raw = yield* failure(Effect.suspend(() => tool.execute(input, { key })))
return yield* output(name, tool, raw)
}),
options?.detaching,
)
})
const durableTool = (
path: ReadonlyArray<string>,
): {
readonly name: string
readonly tool: Tool<R>
readonly durable: Durable<unknown, unknown, R>
} => {
const segments = canonicalSegments(path)
const name = segments.join(".")
const tool = lookup(root, segments)?.tool
if (tool?.mode?._tag !== "CodeModeDurable") {
throw new TypeError(`Tool '${name}' is not a durable tool.`)
}
return { name, tool, durable: tool.mode }
}
return {
calls,
hooks,
invocations,
record: (name) => recordCall({ name }),
keys: (path) => namespaceKeys(root, path),
search: (args, options) =>
Effect.suspend(() => executeTool("search", makeSearchTool(prepared.searchIndex), args, options)),
execute: (path, args, options) =>
Effect.suspend(() => {
const segments = canonicalSegments(path)
// Models often write `tools.search(...)` for the bare `search(...)`; honor it unless a tool owns that path.
if (segments.length === 1 && segments[0] === "search" && lookup(root, segments) === undefined)
return executeTool("search", makeSearchTool(prepared.searchIndex), args, options)
return executeTool(segments.join("."), resolve(root, path, prepared.searchIndex), args, options)
}),
mode: (path) => {
const segments = canonicalSegments(path)
if (segments.length === 1 && segments[0] === "search" && lookup(root, segments) === undefined) return undefined
return lookup(root, segments)?.tool?.mode
},
start: (path, args, key, admit) =>
Effect.suspend(() => {
const found = durableTool(path)
return Effect.gen(function* () {
const input = yield* decode(found.name, found.tool, args)
yield* Effect.sync(() => (admit !== undefined ? admit(found.name) : recordCall({ name: found.name })))
const invocation: ToolInvocation = { name: found.name, input, key }
invocations.set(key, invocation)
const before = hooks["tool.before"]
const after = hooks["tool.after"]
const run = failure(Effect.suspend(() => found.durable.start(input, { key }))).pipe(
Effect.flatMap((raw) =>
Effect.try({
try: (): Json => {
const text = JSON.stringify(raw)
return text === undefined ? null : JSON.parse(text)
},
catch: (cause) =>
new ToolRuntimeError("InvalidToolOutput", `Invalid start data from tool '${found.name}': ${cause}`),
}),
),
)
const observed =
after === undefined
? run
: Effect.onError(run, (cause) => {
invocations.delete(key)
if (Cause.hasInterruptsOnly(cause)) return after(invocation, { status: "interrupted" })
return after(invocation, { status: "failure", error: Cause.squash(cause) })
})
return yield* before === undefined ? observed : Effect.andThen(before(invocation), observed)
})
}),
wait: (path, args, key, data, detaching) =>
Effect.suspend(() => {
const found = durableTool(path)
const wait = found.durable.wait as (data: Json, context: ToolContext) => Effect.Effect<unknown, unknown, R>
const after = hooks["tool.after"]
const run = Effect.gen(function* () {
const raw = yield* failure(Effect.suspend(() => wait(data, { key })))
return yield* output(found.name, found.tool, raw)
})
if (after === undefined) return run
const known = invocations.get(key)
const callEffect =
known !== undefined
? Effect.succeed(known)
: Effect.map(
decode(found.name, found.tool, args),
(input): ToolInvocation => ({
name: found.name,
input,
key,
}),
)
return Effect.flatMap(callEffect, (call) =>
Effect.onExit(run, (exit) => {
if (detaching()) return Effect.void
invocations.delete(key)
if (Exit.isSuccess(exit)) return after(call, { status: "success", value: exit.value })
if (Cause.hasInterruptsOnly(exit.cause)) return after(call, { status: "interrupted" })
return after(call, { status: "failure", error: Cause.squash(exit.cause) })
}),
)
}),
cancel: (path, data) =>
Effect.suspend(() => {
const cancel = durableTool(path).durable.cancel as (data: Json) => Effect.Effect<void, unknown, R>
return failure(cancel(data))
}),
}
}
export * as ToolRuntime from "./tool-runtime.js"