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TypeScript
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254import { Effect, JsonSchema, Schema } from "effect"import { Tool } from "@opencode/schema/tool"import type { ToolCallPart, ToolDefinition as ToolDefinitionClass, ToolOutput as ToolOutputType,} from "./schema/index.js"import { ToolDefinition, ToolFailure, ToolOutput } from "./schema/index.js"
/** * Schema constraint for tool parameters / success values: no decoding or * encoding services are allowed. Tools should be self-contained — anything * beyond pure data conversion belongs in the handler closure. */export type ToolSchema<T> = Schema.Codec<T, any, never, never>export interface ToolExecuteContext { readonly id: ToolCallPart["id"] readonly name: ToolCallPart["name"] readonly namespace?: ToolCallPart["namespace"]}
export type ToolExecute<Parameters extends ToolSchema<any>, Success extends ToolSchema<any>> = ( params: Schema.Schema.Type<Parameters>, context?: ToolExecuteContext,) => Effect.Effect<Schema.Schema.Type<Success>, ToolFailure>
export interface ToolModelOutputInput<Parameters, Output> { readonly id: ToolCallPart["id"] readonly parameters: Parameters readonly output: Output}
export type ToolToModelOutput<Parameters extends ToolSchema<any>, Success extends ToolSchema<any>> = ( input: ToolModelOutputInput<Schema.Schema.Type<Parameters>, Success["Encoded"]>,) => ReadonlyArray<Tool.Content>
/** * A type-safe LLM tool. Each tool bundles its own description, parameter * Schema and success Schema. The execute handler is optional: omit it when you * only want to expose a tool schema to the model and handle tool calls outside * this package. * * Errors must be expressed as `ToolFailure`. Unmapped errors and defects fail * the stream. * * Internally each tool also carries memoized codecs and a precomputed * `ToolDefinition` so callers do not rebuild them per invocation. */export interface Definition<Parameters extends ToolSchema<any>, Success extends ToolSchema<any>> { readonly description: string readonly parameters: Parameters readonly success: Success readonly execute?: ToolExecute<Parameters, Success> readonly toModelOutput?: ToolToModelOutput<Parameters, Success> readonly toStructuredOutput?: (output: Success["Encoded"]) => unknown /** @internal */ readonly _decode: (input: unknown) => Effect.Effect<Schema.Schema.Type<Parameters>, Schema.SchemaError> /** @internal */ readonly _encode: (value: Schema.Schema.Type<Success>) => Effect.Effect<unknown, Schema.SchemaError> /** @internal */ readonly _project: ( parameters: Schema.Schema.Type<Parameters>, id: ToolCallPart["id"], output: unknown, ) => ToolOutputType /** @internal */ readonly _legacyResult: boolean /** @internal */ readonly _definition: ToolDefinitionClass}
export type AnyTool = Definition<any, any>
export type ExecutableTool<Parameters extends ToolSchema<any>, Success extends ToolSchema<any>> = Definition< Parameters, Success> & { readonly execute: ToolExecute<Parameters, Success>}
export type AnyExecutableTool = ExecutableTool<any, any>
export type ExecutableTools = Record<string, AnyExecutableTool>
type TypedToolConfig = { readonly description: string readonly parameters: ToolSchema<any> readonly success: ToolSchema<any> readonly execute?: ToolExecute<ToolSchema<any>, ToolSchema<any>> readonly toModelOutput?: ToolToModelOutput<ToolSchema<any>, ToolSchema<any>> readonly toStructuredOutput?: (output: unknown) => unknown}
type DynamicToolConfig = { readonly description: string readonly jsonSchema: JsonSchema.JsonSchema readonly outputSchema?: JsonSchema.JsonSchema readonly execute?: (params: unknown, context?: ToolExecuteContext) => Effect.Effect<unknown, ToolFailure> readonly toModelOutput?: (input: ToolModelOutputInput<unknown, unknown>) => ReadonlyArray<Tool.Content> readonly toStructuredOutput?: (output: unknown) => unknown}
/** * Constructs a tool. Two input modes: * * 1. **Typed** — pass Effect `parameters` and `success` Schemas; inputs and * outputs are statically typed and decoded/encoded automatically. * * ```ts * Tool.make({ * description: "Get current weather", * parameters: Schema.Struct({ city: Schema.String }), * success: Schema.Struct({ temperature: Schema.Number }), * execute: ({ city }) => Effect.succeed({ temperature: 22 }), * }) * ``` * * 2. **Dynamic** — pass raw JSON Schema as `jsonSchema`. Use this when the * schema comes from an external source (MCP server, plugin manifest, * dynamic config) and is not known at compile time. Inputs are typed as * `unknown`; the handler is responsible for any validation it needs. * * ```ts * Tool.make({ * description: "Look something up", * jsonSchema: { type: "object", properties: { ... } }, * execute: (params) => Effect.succeed(...), * }) * ``` * * In both modes the produced tool flows through `toDefinitions(...)` * identically. */export function make<Parameters extends ToolSchema<any>, Success extends ToolSchema<any>>(config: { readonly description: string readonly parameters: Parameters readonly success: Success readonly execute: ToolExecute<Parameters, Success> readonly toModelOutput?: ToolToModelOutput<Parameters, Success> readonly toStructuredOutput?: (output: Success["Encoded"]) => unknown}): ExecutableTool<Parameters, Success>export function make<Parameters extends ToolSchema<any>, Success extends ToolSchema<any>>(config: { readonly description: string readonly parameters: Parameters readonly success: Success readonly execute?: undefined readonly toModelOutput?: ToolToModelOutput<Parameters, Success> readonly toStructuredOutput?: (output: Success["Encoded"]) => unknown}): Definition<Parameters, Success>export function make(config: { readonly description: string readonly jsonSchema: JsonSchema.JsonSchema readonly outputSchema?: JsonSchema.JsonSchema readonly execute: (params: unknown, context?: ToolExecuteContext) => Effect.Effect<unknown, ToolFailure> readonly toModelOutput?: (input: ToolModelOutputInput<unknown, unknown>) => ReadonlyArray<Tool.Content> readonly toStructuredOutput?: (output: unknown) => unknown}): AnyExecutableToolexport function make(config: { readonly description: string readonly jsonSchema: JsonSchema.JsonSchema readonly outputSchema?: JsonSchema.JsonSchema readonly execute?: undefined readonly toModelOutput?: (input: ToolModelOutputInput<unknown, unknown>) => ReadonlyArray<Tool.Content> readonly toStructuredOutput?: (output: unknown) => unknown}): AnyToolexport function make(config: TypedToolConfig | DynamicToolConfig): AnyTool { if ("jsonSchema" in config) { return { description: config.description, parameters: Schema.Unknown as ToolSchema<unknown>, success: Schema.Unknown as ToolSchema<unknown>, execute: config.execute, toModelOutput: config.toModelOutput, toStructuredOutput: config.toStructuredOutput, _decode: Effect.succeed, _encode: Effect.succeed, _project: (parameters, id, output) => project(config.toModelOutput, config.toStructuredOutput, parameters, id, output), _legacyResult: config.toModelOutput === undefined && config.toStructuredOutput === undefined, _definition: new ToolDefinition({ name: "", description: config.description, inputSchema: config.jsonSchema, outputSchema: config.outputSchema, }), } } return { description: config.description, parameters: config.parameters, success: config.success, execute: config.execute, toModelOutput: config.toModelOutput, toStructuredOutput: config.toStructuredOutput, _decode: Schema.decodeUnknownEffect(config.parameters), _encode: Schema.encodeEffect(config.success), _project: (parameters, id, output) => project(config.toModelOutput, config.toStructuredOutput, parameters, id, output), _legacyResult: false, _definition: new ToolDefinition({ name: "", description: config.description, inputSchema: toJsonSchema(config.parameters), outputSchema: toJsonSchema(config.success), }), }}
/** * A record of named tools. The record key becomes the tool name on the wire. */export type Tools = Record<string, AnyTool>
/** * Convert a tools record into the `ToolDefinition[]` shape that * `LLMRequest.tools` expects. * * Tool names come from the record keys, so the per-tool cached * `_definition` is rebuilt with the correct name here. The JSON Schema body * is reused. */export const toDefinitions = (tools: Tools): ReadonlyArray<ToolDefinitionClass> => Object.entries(tools).map( ([name, item]) => new ToolDefinition({ name, description: item._definition.description, inputSchema: item._definition.inputSchema, outputSchema: item._definition.outputSchema, }), )
const toJsonSchema = (schema: Schema.Top): JsonSchema.JsonSchema => { const document = Schema.toJsonSchemaDocument(schema) if (Object.keys(document.definitions).length === 0) return document.schema return { ...document.schema, $defs: document.definitions }}
const project = ( toModelOutput: ((input: ToolModelOutputInput<any, any>) => ReadonlyArray<Tool.Content>) | undefined, toStructuredOutput: ((output: unknown) => unknown) | undefined, parameters: unknown, id: ToolCallPart["id"], output: unknown,): ToolOutputType => ToolOutput.make( toStructuredOutput?.(output) ?? output, toModelOutput?.({ id, parameters, output }) ?? (typeof output === "string" ? [{ type: "text", text: output }] : []), )
export { ToolFailure }
export * as Tool from "./tool.js"