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TypeScript
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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) => 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 }
/** A call the program is making to an extension global, with its arguments. */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. */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>,): Effect.Effect<A, unknown, R> => { const observed = after === undefined ? run : Effect.onExit(run, (exit) => { 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 = 10const 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 '${name}' contains an empty segment.`) const child = current.children.get(segment) ?? { children: new Map() } current.children.set(segment, child) current = child } if (isTool<R>(value)) current.tool = value else if (isNamespace<R>(value)) { current.namespace = value insert(current, value.tools) } else insert(current, value) } } insert(root, tools) return root}
const canonicalSegments = (path: ReadonlyArray<string>): ReadonlyArray<string> => path.flatMap((segment) => segment.split("."))
type VisibleTool<R> = { readonly path: string readonly tool: Tool<R> readonly namespaces: ReadonlyArray<Namespace<R>>}
const flattenTools = <R>( node: ToolNode<R>, path: ReadonlyArray<string> = [], namespaces: ReadonlyArray<Namespace<R>> = [],): Array<VisibleTool<R>> => { const next = node.namespace === undefined ? namespaces : [...namespaces, node.namespace] return [ ...(node.tool === undefined ? [] : [{ path: path.join("."), tool: node.tool, namespaces: next }]), ...Array.from(node.children).flatMap(([name, child]) => flattenTools(child, [...path, name], next)), ]}
const describeTool = <R>(visible: VisibleTool<R>): ToolDescription => { let signature: string | undefined return { path: visible.path, description: visible.tool.description, get signature() { // Search ranks paths and descriptions first; only returned matches need their schemas rendered. // Joining the final fragments avoids retaining the rendering's intermediate string ropes in JSC. return (signature ??= [ toolExpression(visible.path), isEmptyInput(visible.tool) ? "()" : `(${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 /** The path split into words, so `zones` matches `get_zones` as a word rather than as a substring of `timezones`. */ readonly pathWords: ReadonlyArray<string> readonly searchText: string}
const tokenize = (query: string): Array<string> => query .replace(/([a-z0-9])([A-Z])/g, "$1 $2") .toLowerCase() .split(/[^a-z0-9]+/) .filter((term) => term.length > 0 && term !== "*")
const termForms = (term: string): Array<string> => { const forms = [term] if (term.endsWith("es") && term.length > 3) forms.push(term.slice(0, -2)) if (term.endsWith("s") && term.length > 2) forms.push(term.slice(0, -1)) return forms}
const rank = (entries: ReadonlyArray<SearchEntry>, query: string): Array<SearchEntry> => { const terms = tokenize(query).map(termForms) return entries .map((entry) => { const path = entry.description.path.toLowerCase() const description = entry.description.description.toLowerCase() const score = terms.reduce( (total, forms) => total + (forms.some((form) => path === form || path.endsWith(`.${form}`)) ? 20 : 0) + (forms.some((form) => entry.pathWords.includes(form)) ? 12 : 0) + (forms.some((form) => path.includes(form)) ? 8 : 0) + (forms.some((form) => description.includes(form)) ? 4 : 0) + (forms.some((form) => entry.searchText.includes(form)) ? 2 : 0), 0, ) return { entry, score } }) .filter(({ score }) => terms.length === 0 || score > 0) .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(`${ns}.`)) const trimmed = query.trim() const pathQuery = trimmed.startsWith("tools.") ? trimmed.slice("tools.".length) : trimmed const exact = pathQuery === "" ? undefined : scoped.find( (entry) => entry.description.path === pathQuery || toolExpression(entry.description.path) === trimmed, ) const ranked = exact !== undefined ? [exact] : rank(scoped, query) const items = ranked.slice(offset, offset + (request.limit ?? defaultSearchLimit)).map(({ description }) => ({ ...description, path: toolExpression(description.path), })) const remaining = Math.max(0, ranked.length - offset - items.length) return { items, remaining, next: remaining > 0 ? { offset: offset + items.length } : null, } }),})
/** Exact callable signature of the built-in `search` function, for host-owned instructions. */export const searchSignature = (() => { const tool = makeSearchTool([]) return `search(${inputTypeScript(tool, true)}): ${outputTypeScript(tool, true)}`})()
const toSearchEntry = <R>(visible: VisibleTool<R>): SearchEntry => ({ description: describeTool(visible), pathWords: tokenize(visible.path), searchText: [ visible.path, visible.tool.description, ...visible.namespaces.flatMap((namespace) => (namespace.description === undefined ? [] : [namespace.description])), ...inputProperties(visible.tool).flatMap(({ name, description: property }) => property === undefined ? [name] : [name, property], ), ] .join("\n") .toLowerCase(),})
export const prepare = <R>(tools: Tools<R>): Prepared<R> => { const root = toolTrie(tools) let searchIndex: ReadonlyArray<SearchEntry> | undefined let catalog: ReadonlyArray<ToolDescription> | undefined return { root, get catalog() { return (catalog ??= this.searchIndex.map((entry) => entry.description)) }, get searchIndex() { // Executing known tools only needs the trie. Render discovery when it is actually read, // ordering after canonical-path collisions settle so instruction bytes stay deterministic. return (searchIndex ??= flattenTools(root) .sort((left, right) => compareText(left.path, right.path)) .map(toSearchEntry)) }, }}
const lookup = <R>(root: ToolNode<R>, segments: ReadonlyArray<string>): ToolNode<R> | undefined => segments.reduce<ToolNode<R> | undefined>((node, segment) => node?.children.get(segment), root)
const namespaceKeys = <R>(root: ToolNode<R>, path: ReadonlyArray<string>): ReadonlyArray<string> => { const segments = canonicalSegments(path) const node = lookup(root, segments) if (node === undefined) { throw new ToolRuntimeError("UnknownTool", `Unknown tool namespace '${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(`${ns}.`)) : index, ns ? segments.slice(1).join(" ") : name, )[0] throw new ToolRuntimeError( "UnknownTool", closest ? `Unknown tool '${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" }}
/** 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 execute: ( path: ReadonlyArray<string>, args: Array<Json | undefined>, ) => Effect.Effect<Json | undefined, unknown, R> readonly search: (args: Array<Json | undefined>) => Effect.Effect<Json | undefined, unknown, R> readonly keys: (path: ReadonlyArray<string>) => ReadonlyArray<string>}
/** 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 root = prepared.root
const recordCall = (call: ToolCall): void => { if (maxToolCalls !== undefined && calls.length >= maxToolCalls) { throw new ToolRuntimeError("ToolCallLimitExceeded", `Execution exceeded its tool-call limit of ${maxToolCalls}.`) } calls.push(call) }
const executeTool = (name: string, tool: Tool<R>, args: Array<Json | undefined>) => Effect.gen(function* () { const normalized = args.length === 0 ? [{}] : args if (normalized.length !== 1) throw new ToolRuntimeError("InvalidToolInput", `Tool '${name}' expects at most one input object.`) const input = yield* Effect.try({ try: () => decodeToolInput(tool, normalized[0]), catch: (cause) => new ToolRuntimeError( "InvalidToolInput", `Invalid input for tool '${name}': ${String(cause)}`, name === "search" ? [] : ["The signature may have changed. Use search to get the current signature."], ), }) yield* Effect.sync(() => recordCall({ name })) return yield* hooked( { name, input }, hooks["tool.before"], hooks["tool.after"], Effect.gen(function* () { const raw = yield* Effect.suspend(() => tool.execute(input)).pipe( Effect.catchCause((cause) => { if (Cause.hasInterruptsOnly(cause)) return Effect.interrupt return Effect.fail( toolError( Cause.prettyErrors(cause) .map((error) => (error.cause ? Formatter.format(error) : error.message || error.name)) .join("\n"), ), ) }), ) // The same round trip a tool result would take through text: exact JSON.stringify semantics. return yield* Effect.try({ try: (): Json | undefined => { const text = JSON.stringify(decodeToolOutput(tool, raw)) return text === undefined ? undefined : JSON.parse(text) }, catch: (cause) => new ToolRuntimeError("InvalidToolOutput", `Invalid output from tool '${name}': ${cause}`), }) }), ) })
return { calls, hooks, keys: (path) => namespaceKeys(root, path), search: (args) => Effect.suspend(() => executeTool("search", makeSearchTool(prepared.searchIndex), args)), execute: (path, args) => 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) return executeTool(segments.join("."), resolve(root, path, prepared.searchIndex), args) }), }}
export * as ToolRuntime from "./tool-runtime.js"