Type Alias ToolCallFromTool<T>

ToolCallFromTool: T extends { name: infer N }
    ? InferToolInput<T> extends infer Args
        ? Args extends never
            ? never
            : Args extends Record<string, any>
                ? { args: Args; id?: string; name: N; type?: "tool_call" }
                : never
        : never
    : never

Infer a tool call type from a single tool. Works with tools created via tool() from @langchain/core/tools.

For DynamicStructuredTool, this extracts the input type from the _call method, which is the most reliable source as it's the pre-computed input type.

Type Parameters

T
The tool type (e.g., DynamicStructuredTool)

Example

import { tool } from "@langchain/core/tools";
import { z } from "zod";

const getWeather = tool(
  async ({ location }) => `Weather in ${location}`,
  { name: "get_weather", schema: z.object({ location: z.string() }) }
);

// Infer: { name: "get_weather"; args: { location: string }; id?: string; type?: "tool_call" }
type WeatherToolCall = ToolCallFromTool<typeof getWeather>;

Type Alias ToolCallFromTool<T>

Type Parameters

Example

Settings