kopia lustrzana https://github.com/transitive-bullshit/chatgpt-api
125 wiersze
3.3 KiB
Markdown
125 wiersze
3.3 KiB
Markdown
---
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title: LangChain
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description: How to use Agentic tools with the LangChain TS SDK.
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---
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## Install
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<CodeGroup>
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```bash npm
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npm install langchain @langchain/core @langchain/agents @agentic/langchain @agentic/platform-tool-client
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```
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```bash pnpm
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pnpm add langchain @langchain/core @langchain/agents @agentic/langchain @agentic/platform-tool-client
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```
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```bash bun
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bun add langchain @langchain/core @langchain/agents @agentic/langchain @agentic/platform-tool-client
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```
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```bash yarn
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yarn add langchain @langchain/core @langchain/agents @agentic/langchain @agentic/platform-tool-client
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```
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</CodeGroup>
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## Usage
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This example uses the [`@agentic/search`](https://agentic.so/marketplace/projects/@agentic/search) tool.
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```ts
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import 'dotenv/config'
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import { createLangChainTools } from '@agentic/langchain'
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import { AgenticToolClient } from '@agentic/platform-tool-client'
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import { ChatPromptTemplate } from '@langchain/core/prompts'
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import { ChatOpenAI } from '@langchain/openai'
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import { AgentExecutor, createToolCallingAgent } from 'langchain/agents'
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async function main() {
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const searchTool = await AgenticToolClient.fromIdentifier('@agentic/search')
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const tools = createLangChainTools(searchTool)
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const agent = createToolCallingAgent({
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llm: new ChatOpenAI({ model: 'gpt-4o-mini', temperature: 0 }),
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tools,
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prompt: ChatPromptTemplate.fromMessages([
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['system', 'You are a helpful assistant. Be as concise as possible.'],
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['placeholder', '{chat_history}'],
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['human', '{input}'],
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['placeholder', '{agent_scratchpad}']
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])
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})
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const agentExecutor = new AgentExecutor({
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agent,
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tools
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// verbose: true
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})
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const result = await agentExecutor.invoke({
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input: 'What is the weather in San Francisco?'
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})
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console.log(result.output)
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}
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await main()
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```
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<Expandable title="Additional dependencies">
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This example also uses the [@langchain/openai](https://js.langchain.com/docs/integrations/platforms/openai) package, which adds OpenAI support to LangChain.
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_Note that OpenAI is not necessary to use Agentic; this is just an example._
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<CodeGroup>
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```bash npm
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npm install @langchain/openai dotenv
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```
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```bash pnpm
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pnpm add @langchain/openai dotenv
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```
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```bash bun
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bun add @langchain/openai dotenv
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```
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```bash yarn
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yarn add @langchain/openai dotenv
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```
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</CodeGroup>
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</Expandable>
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## Running this example
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You can view the full source for this example here: https://github.com/transitive-bullshit/agentic/tree/main/examples/ts-sdks/langchain
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<Info>
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You'll need an [OpenAI API key](https://platform.openai.com/docs/quickstart)
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to run this example. Store it in a local `.env` file as `OPENAI_API_KEY`.
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</Info>
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<Info>
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The
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[`@agentic/search`](https://agentic.so/marketplace/projects/@agentic/search)
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tool comes with a generous free tier, but once that runs out, you'll need to
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sign up for a paid plan and add an `AGENTIC_API_KEY` to your `.env` file.
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</Info>
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```sh
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git clone git@github.com:transitive-bullshit/agentic.git
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cd agentic
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pnpm install
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pnpm build
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echo 'OPENAI_API_KEY=your-key' >> .env
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npx tsx examples/ts-sdks/langchain/bin/weather.ts
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```
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## Additional resources
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- [`@agentic/langchain` source](https://github.com/transitive-bullshit/agentic/blob/main/stdlib/langchain/src/langchain.ts)
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- [LangChain TS docs](https://js.langchain.com)
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