import z from "zod"import type { MessageV2 } from "../session/message-v2"import type { Agent } from "../agent/agent"import type { PermissionNext } from "../permission/next"import { Truncate } from "./truncation" export namespace Tool { interface Metadata { [key: string]: any } export interface InitContext { agent?: Agent.Info } export type Context<M extends Metadata = Metadata> = { sessionID: string messageID: string agent: string abort: AbortSignal callID?: string extra?: { [key: string]: any } messages: MessageV2.WithParts[] metadata(input: { title?: string; metadata?: M }): void ask(input: Omit<PermissionNext.Request, "id" | "sessionID" | "tool">): Promise<void> } export interface Info<Parameters extends z.ZodType = z.ZodType, M extends Metadata = Metadata> { id: string init: (ctx?: InitContext) => Promise<{ description: string parameters: Parameters execute( args: z.infer<Parameters>, ctx: Context, ): Promise<{ title: string metadata: M output: string attachments?: MessageV2.FilePart[] }> formatValidationError?(error: z.ZodError): string }> } export type InferParameters<T extends Info> = T extends Info<infer P> ? z.infer<P> : never export type InferMetadata<T extends Info> = T extends Info<any, infer M> ? M : never export function define<Parameters extends z.ZodType, Result extends Metadata>( id: string, init: Info<Parameters, Result>["init"] | Awaited<ReturnType<Info<Parameters, Result>["init"]>>, ): Info<Parameters, Result> { return { id, init: async (initCtx) => { const toolInfo = init instanceof Function ? await init(initCtx) : init const execute = toolInfo.execute toolInfo.execute = async (args, ctx) => { try { toolInfo.parameters.parse(args) } catch (error) { if (error instanceof z.ZodError && toolInfo.formatValidationError) { throw new Error(toolInfo.formatValidationError(error), { cause: error }) } throw new Error( `The ${id} tool was called with invalid arguments: ${error}.\nPlease rewrite the input so it satisfies the expected schema.`, { cause: error }, ) } const result = await execute(args, ctx) // skip truncation for tools that handle it themselves if (result.metadata.truncated !== undefined) { return result } const truncated = await Truncate.output(result.output, {}, initCtx?.agent) return { ...result, output: truncated.content, metadata: { ...result.metadata, truncated: truncated.truncated, ...(truncated.truncated && { outputPath: truncated.outputPath }), }, } } return toolInfo }, } }}
import z from "zod"
import type { MessageV2 } from "../session/message-v2"
import type { Agent } from "../agent/agent"
import type { PermissionNext } from "../permission/next"
import { Truncate } from "./truncation"
export namespace Tool {
interface Metadata {
[key: string]: any
}
export interface InitContext {
agent?: Agent.Info
}
export type Context<M extends Metadata = Metadata> = {
sessionID: string
messageID: string
agent: string
abort: AbortSignal
callID?: string
extra?: { [key: string]: any }
messages: MessageV2.WithParts[]
metadata(input: { title?: string; metadata?: M }): void
ask(input: Omit<PermissionNext.Request, "id" | "sessionID" | "tool">): Promise<void>
}
export interface Info<Parameters extends z.ZodType = z.ZodType, M extends Metadata = Metadata> {
id: string
init: (ctx?: InitContext) => Promise<{
description: string
parameters: Parameters
execute(
args: z.infer<Parameters>,
ctx: Context,
): Promise<{
title: string
metadata: M
output: string
attachments?: MessageV2.FilePart[]
}>
formatValidationError?(error: z.ZodError): string
}>
}
export type InferParameters<T extends Info> = T extends Info<infer P> ? z.infer<P> : never
export type InferMetadata<T extends Info> = T extends Info<any, infer M> ? M : never
export function define<Parameters extends z.ZodType, Result extends Metadata>(
id: string,
init: Info<Parameters, Result>["init"] | Awaited<ReturnType<Info<Parameters, Result>["init"]>>,
): Info<Parameters, Result> {
return {
id,
init: async (initCtx) => {
const toolInfo = init instanceof Function ? await init(initCtx) : init
const execute = toolInfo.execute
toolInfo.execute = async (args, ctx) => {
try {
toolInfo.parameters.parse(args)
} catch (error) {
if (error instanceof z.ZodError && toolInfo.formatValidationError) {
throw new Error(toolInfo.formatValidationError(error), { cause: error })
}
throw new Error(
`The ${id} tool was called with invalid arguments: ${error}.\nPlease rewrite the input so it satisfies the expected schema.`,
{ cause: error },
)
}
const result = await execute(args, ctx)
// skip truncation for tools that handle it themselves
if (result.metadata.truncated !== undefined) {
return result
}
const truncated = await Truncate.output(result.output, {}, initCtx?.agent)
return {
...result,
output: truncated.content,
metadata: {
...result.metadata,
truncated: truncated.truncated,
...(truncated.truncated && { outputPath: truncated.outputPath }),
},
}
}
return toolInfo
},
}
}
}