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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| { | ||
| "cells": [ | ||
| { | ||
| "cell_type": "markdown", | ||
| "metadata": {}, | ||
| "source": [ | ||
| "# How to access the RunnableConfig object within a custom tool\n", | ||
| "\n", | ||
| "```{=mdx}\n", | ||
| ":::info Prerequisites\n", | ||
| "\n", | ||
| "This guide assumes familiarity with the following concepts:\n", | ||
| "\n", | ||
| "- [LangChain Tools](/docs/concepts/#tools)\n", | ||
| "- [Custom tools](/docs/how_to/custom_tools)\n", | ||
| "- [LangChain Expression Language (LCEL)](/docs/concepts/#langchain-expression-language)\n", | ||
| "\n", | ||
| ":::\n", | ||
| "```\n", | ||
| "\n", | ||
| "Tools are runnables, and you can treat them the same way as any other runnable at the interface level - you can call `invoke()`, `batch()`, and `stream()` on them as normal. However, when writing custom tools, you may want to invoke other runnables like chat models or retrievers. In order to properly trace and configure those sub-invocations, you'll need to manually access and pass in the tool's current [`RunnableConfig`](https://api.js.langchain.com/interfaces/langchain_core_runnables.RunnableConfig.html) object.\n", | ||
| "\n", | ||
| "This guide covers how to do this for custom tools created in different ways.\n", | ||
| "\n", | ||
| "## From the `tool` method\n", | ||
| "\n", | ||
| "Accessing the `RunnableConfig` object for a custom tool created with the [`tool`](https://api.js.langchain.com/functions/langchain_core_tools.tool-1.html) helper method is simple - it's always the second parameter passed into your custom function. Here's an example:" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "code", | ||
| "execution_count": 1, | ||
| "metadata": {}, | ||
| "outputs": [], | ||
| "source": [ | ||
| "import { z } from \"zod\";\n", | ||
| "import { tool } from \"@langchain/core/tools\";\n", | ||
| "import type { RunnableConfig } from \"@langchain/core/runnables\";\n", | ||
| "\n", | ||
| "const reverseTool = tool(\n", | ||
| " async (input: { text: string }, config?: RunnableConfig) => {\n", | ||
| " const originalString = input.text + (config?.configurable?.additional_field ?? \"\");\n", | ||
| " return originalString.split(\"\").reverse().join(\"\");\n", | ||
| " }, {\n", | ||
| " name: \"reverse\",\n", | ||
| " description: \"A test tool that combines input text with a configurable parameter.\",\n", | ||
| " schema: z.object({\n", | ||
| " text: z.string()\n", | ||
| " }),\n", | ||
| " }\n", | ||
| ");" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "markdown", | ||
| "metadata": {}, | ||
| "source": [ | ||
| "Then, if we invoke the tool with a `config` containing a `configurable` field, we can see that `additional_field` is passed through correctly:" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "code", | ||
| "execution_count": 2, | ||
| "metadata": {}, | ||
| "outputs": [ | ||
| { | ||
| "name": "stdout", | ||
| "output_type": "stream", | ||
| "text": [ | ||
| "321cba\n" | ||
| ] | ||
| } | ||
| ], | ||
| "source": [ | ||
| "await reverseTool.invoke(\n", | ||
| " {text: \"abc\"}, {configurable: {additional_field: \"123\"}}\n", | ||
| ")" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "markdown", | ||
| "metadata": {}, | ||
| "source": [ | ||
| "## Next steps\n", | ||
| "\n", | ||
| "You've now seen how to configure and stream events from within a tool. Next, check out the following guides for more on using tools:\n", | ||
| "\n", | ||
| "- Pass [tool results back to a model](/docs/how_to/tool_results_pass_to_model)\n", | ||
| "- Building [tool-using chains and agents](/docs/how_to#tools)\n", | ||
| "- Getting [structured outputs](/docs/how_to/structured_output/) from models" | ||
| ] | ||
| } | ||
| ], | ||
| "metadata": { | ||
| "kernelspec": { | ||
| "display_name": "TypeScript", | ||
| "language": "typescript", | ||
| "name": "tslab" | ||
| }, | ||
| "language_info": { | ||
| "codemirror_mode": { | ||
| "mode": "typescript", | ||
| "name": "javascript", | ||
| "typescript": true | ||
| }, | ||
| "file_extension": ".ts", | ||
| "mimetype": "text/typescript", | ||
| "name": "typescript", | ||
| "version": "3.7.2" | ||
| } | ||
| }, | ||
| "nbformat": 4, | ||
| "nbformat_minor": 2 | ||
| } |
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