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Add the LangChain DeepAgents.js
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‎.github/dependabot.yml‎

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- '/common/backend/'
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- '/agents/agent-ai-sdk/'
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- '/agents/agent-claude-agent-sdk/'
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- '/agents/agent-deepagents/'
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- '/agents/agent-langchain/'
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- '/agents/agent-langchain-nextjs/'
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- '/agents/agent-strands/'

‎agents/agent-ai-sdk/package.json‎

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"jiti": "^2.6.1",
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"tsx": "^4.21.0",
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"typescript": "^5.9.3",
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"typescript-eslint": "^8.58.1",
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"typescript-eslint": "^8.58.2",
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"vite": "^8.0.8",
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"vitest": "^4.1.4"
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},
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"dependencies": {
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"@ai-sdk/amazon-bedrock": "^4.0.92",
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"@ai-sdk/amazon-bedrock": "^4.0.93",
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"@ai-sdk/azure": "^3.0.53",
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"@llm-ts-example/common-backend-core": "workspace:*",
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"@llm-ts-example/common-core": "workspace:*",
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"@smithy/eventstream-codec": "^4.2.14",
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"ai": "^6.0.156",
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"aws-cdk-lib": "^2.248.0",
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"ai": "^6.0.159",
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"aws-cdk-lib": "^2.249.0",
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"constructs": "^10.6.0",
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"dotenv": "^17.4.1",
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"dotenv": "^17.4.2",
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"zod": "^4.3.6"
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}
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}

‎agents/agent-claude-agent-sdk/package.json‎

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"@stylistic/eslint-plugin": "^5.10.0",
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"@types/node": "^24.12.2",
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"@vitest/eslint-plugin": "^1.6.15",
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"dotenv": "^17.4.1",
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"dotenv": "^17.4.2",
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"esbuild": "^0.27.7",
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"eslint": "^10.2.0",
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"eslint-import-resolver-typescript": "^4.4.4",
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"jiti": "^2.6.1",
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"tsx": "^4.21.0",
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"typescript": "^5.9.3",
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"typescript-eslint": "^8.58.1",
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"typescript-eslint": "^8.58.2",
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"vite": "^8.0.8",
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"vitest": "^4.1.4"
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},

‎agents/agent-deepagents/.gitignore‎

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*.js
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!jest.config.js
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*.d.ts
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node_modules
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# CDK asset staging directory
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.cdk.staging
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cdk.out
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!eslint.config.js
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!types/*.d.ts
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!lambda/awslambda.d.ts
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!*.config.js
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.env*
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vite.config.js
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eslint.config.js
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tsconfig.tsbuildinfo

‎agents/agent-deepagents/eslint.config.ts‎

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import { defineConfig } from 'eslint/config';
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import eslint from '@eslint/js';
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import stylistic from '@stylistic/eslint-plugin';
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import { configs, parser } from 'typescript-eslint';
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import eslintImport from 'eslint-plugin-import-x';
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import { includeIgnoreFile } from '@eslint/compat';
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import path from 'node:path';
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import { fileURLToPath } from 'node:url';
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const __filename = fileURLToPath(import.meta.url);
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const __dirname = path.dirname(__filename);
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const gitignorePath = path.resolve(__dirname, '.gitignore');
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export default defineConfig(
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includeIgnoreFile(gitignorePath),
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{
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ignores: [
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'**/*.d.ts',
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'**/*.js',
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'node_modules/**/*',
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'out',
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'dist',
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'cdk.out',
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'.output',
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],
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},
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eslint.configs.recommended,
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...configs.strict,
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...configs.stylistic,
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{
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files: ['{bin,lib,lambda}/**/*.{ts,tsx}', '*.js'],
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plugins: {
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'@stylistic': stylistic,
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},
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languageOptions: {
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ecmaVersion: 'latest',
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sourceType: 'module',
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parser,
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parserOptions: {
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tsconfigRootDir: __dirname,
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project: ['./tsconfig-eslint.json'],
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},
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},
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extends: [
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eslintImport.flatConfigs.recommended,
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eslintImport.flatConfigs.typescript,
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],
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settings: {
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'import-x/resolver': {
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// You will also need to install and configure the TypeScript resolver
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// See also https://github.com/import-js/eslint-import-resolver-typescript#configuration
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'typescript': true,
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'node': true,
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},
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},
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rules: {
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'@stylistic/semi': ['error', 'always'],
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'@stylistic/indent': ['error', 2],
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'@stylistic/comma-dangle': ['error', 'always-multiline'],
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'@stylistic/quotes': ['error', 'single'],
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},
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},
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);

‎agents/agent-deepagents/package.json‎

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{
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"name": "agent-deepagents",
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"version": "1.0.0",
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"description": "",
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"main": "dist/index.js",
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"type": "module",
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"scripts": {
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"start": "tsx src/index.ts"
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},
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"keywords": [],
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"author": "",
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"dependencies": {
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"@aws-sdk/credential-provider-node": "^3.972.33",
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"@langchain/anthropic": "^1.3.26",
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"@langchain/aws": "^1.3.5",
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"@langchain/core": "^1.1.39",
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"@langchain/mcp-adapters": "^1.1.3",
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"@opentelemetry/api": "^1.9.1",
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"@opentelemetry/exporter-trace-otlp-http": "^0.214.0",
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"@opentelemetry/exporter-trace-otlp-proto": "^0.214.0",
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"@opentelemetry/instrumentation": "^0.214.0",
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"@opentelemetry/resources": "^2.6.1",
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"@opentelemetry/sdk-node": "^0.214.0",
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"@opentelemetry/sdk-trace-base": "^2.6.1",
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"@opentelemetry/sdk-trace-node": "^2.6.1",
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"@opentelemetry/semantic-conventions": "^1.40.0",
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"@traceloop/node-server-sdk": "^0.25.0",
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"deepagents": "^1.9.0",
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"dotenv": "^17.4.2",
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"zod": "^4.3.6"
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},
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"devDependencies": {
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"@eslint/compat": "^2.0.5",
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"@eslint/js": "^10.0.1",
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"@stylistic/eslint-plugin": "^5.10.0",
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"@types/node": "^24.12.2",
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"eslint": "^10.2.0",
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"eslint-import-resolver-typescript": "^4.4.4",
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"eslint-plugin-import-x": "^4.16.2",
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"eslint-plugin-promise": "^7.2.1",
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"langchain": "^1.3.2",
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"tsx": "^4.21.0",
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"typescript": "^5.9.3",
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"typescript-eslint": "^8.58.2",
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"vite": "^8.0.8",
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"vitest": "^4.1.4"
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}
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}

‎agents/agent-deepagents/src/index.ts‎

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import { createDeepAgent } from "deepagents";
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import * as traceloop from "@traceloop/node-server-sdk";
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import { OTLPTraceExporter } from '@opentelemetry/exporter-trace-otlp-proto';
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import { tools } from "./tools.js";
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traceloop.initialize({
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appName: "my-deep-agent",
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exporter: new OTLPTraceExporter({
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url: "http://127.0.0.1:5000/v1/traces",
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headers: {
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"x-mlflow-experiment-id": "0",
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},
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}),
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});
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// System prompt to steer the agent to be an expert researcher
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const researchInstructions = `
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You are an assistant that helps architects design systems using Amazon Web Services (AWS). Your primary function is to answer user questions based on AWS knowledge and propose system architectures. When responding, follow these guidelines:
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- If information is not available in aws-knowledge-mcp-server, clearly state that you don't know
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- Always cite your sources
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- When proposing architectures, provide multiple patterns whenever possible
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- Respond in the same language as the question
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- Keep responses concise yet informative
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- When returning Markdown, ensure it passes markdownlint-cli validation without warnings
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- For non-AWS information, use Context7 to resolve queries with up-to-date information
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- If Context7 cannot resolve the query, clearly state that you don't know
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`;
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const agent = createDeepAgent({
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model: "bedrock:global.amazon.nova-2-lite-v1:0",
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tools,
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systemPrompt: researchInstructions,
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});
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const result = await agent.invoke({
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messages: [{ role: "user", content: "MCPサーバーをサーバーレスで構築するには？" }],
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});
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// Print the agent's response
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console.log(result.messages[result.messages.length - 1].content);

‎agents/agent-deepagents/src/tools.ts‎

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import { MultiServerMCPClient } from "@langchain/mcp-adapters";
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const client = new MultiServerMCPClient({
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'aws-knowledge-mcp-server': {
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transport: "http",
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url: 'https://knowledge-mcp.global.api.aws',
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},
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});
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export const tools = await client.getTools();

‎agents/agent-deepagents/tsconfig.json‎

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{
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"compilerOptions": {
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"target": "esnext",
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"module": "nodenext",
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"lib": [
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"esnext",
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"dom"
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],
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"moduleResolution": "nodenext",
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"moduleDetection": "force",
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"resolveJsonModule": true,
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"allowJs": true,
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"esModuleInterop": true,
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"isolatedModules": true,
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"declaration": true,
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"strict": true,
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"noImplicitAny": true,
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"strictNullChecks": true,
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"noImplicitThis": true,
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"alwaysStrict": true,
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"noUnusedLocals": false,
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"noUnusedParameters": false,
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"noImplicitReturns": true,
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"noFallthroughCasesInSwitch": false,
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"inlineSourceMap": true,
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"inlineSources": true,
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"experimentalDecorators": true,
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"strictPropertyInitialization": false,
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"skipLibCheck": true,
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"rootDir": "./src",
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"outDir": "./dist",
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"typeRoots": [
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"./node_modules",
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"./node_modules/@types",
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"./lambda"
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],
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"types": [
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"node"
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]
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},
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"include": [
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"src/**/*"
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],
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"exclude": [
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"node_modules",
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"cdk.out",
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"eslint.config.*",
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"vitest.config.*"
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]
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}

‎agents/agent-deepagents/vitest.config.ts‎

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/// <reference types="vitest" />
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/// <reference types="vite/client" />
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import { defineConfig } from 'vitest/config';
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import * as dotenv from 'dotenv';
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import { resolve } from 'path';
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export default defineConfig({
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// モノレポ用の共通設定
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resolve: {
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alias: {
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// パッケージ間の直接参照
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'@llm-ts-example/common-core': resolve(__dirname, '../../common/core/src'),
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'@llm-ts-example/common-backend': resolve(__dirname, '../../common/backend/src'),
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},
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},
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server: {
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fs: {
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// モノレポ内のファイルアクセスを許可
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allow: ['..'],
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},
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},
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build: {
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target: 'esnext',
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rollupOptions: {
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// ESModuleとして出力
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output: {
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format: 'es',
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},
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},
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},
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root: '.',
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test: {
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environment: 'node',
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globals: true,
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isolate: true,
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env: dotenv.config({ path: '.env.test' }).parsed,
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testTimeout: 30000,
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},
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// resolve: {
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// conditions: ['development'],
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// }
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});

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