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Add the Agent by LangChain.js
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‎.github/dependabot.yml‎

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- '/agents/agent-voltagent/'
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- '/agents/agent-sdk/'
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- '/agents/agent-strands/'
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- './agents/agents-langchain/'
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- '/basic/cdk/'
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- '/basic/app/'
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- '/mcp/clients/mastra-mcp-client/'

‎README.md‎

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- [basic chat by LangChain.js with LangGraph.js](./basic/)
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- [RAG by LangChain.js with LangGraph.js](./rag/)
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- [Mastra](./agent-mastra/)
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- [node-llama-cpp by LangChain.js with LangGraph.js](./node-llama-cpp/)
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- [GraphRAG local](./graphrag-local/)
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- [WebLLM](./webllm/)
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- [MPC examples](./mpc/)
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- [Mastra](./agents/agent-mastra/)
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- [LangChain.js Agent](./agents/agent-langchain/)
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- [Claude Agent SDK](./agents/agent-sdk/)
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- [Strands TypeScript SDK](./agents/agent-strands/)
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- [VoltAgent](./agents/agent-voltagent/)

‎agents/agent-langchain/.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-langchain/.npmignore‎

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*.ts
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!*.d.ts
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# CDK asset staging directory
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.cdk.staging
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cdk.out

‎agents/agent-langchain/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';
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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/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-langchain/package.json‎

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{
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"name": "agent-langchain",
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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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"build": "tsc --build --clean && tsc",
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"clean": "tsc --build --clean",
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"watch": "tsc -w",
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"test": "vitest run --passWithNoTests",
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"dev": "tsx src/index.ts",
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"lint": "eslint .",
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"lint-fix": "eslint . --fix"
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},
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"devDependencies": {
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"@eslint/compat": "^2.0.0",
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"@eslint/js": "^9.39.2",
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"@stylistic/eslint-plugin": "^5.6.1",
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"@types/aws-lambda": "^8.10.159",
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"@types/node": "^24.10.3",
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"@vitest/eslint-plugin": "^1.5.2",
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"dotenv": "^17.2.3",
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"eslint": "^9.39.2",
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"eslint-import-resolver-typescript": "^4.4.4",
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"eslint-plugin-import": "^2.32.0",
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"eslint-plugin-promise": "^7.2.1",
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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": "^8.49.0",
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"vite": "^7.2.7",
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"vite-tsconfig-paths": "^5.1.4",
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"vitest": "^4.0.15"
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},
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"dependencies": {
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"@arizeai/openinference-instrumentation-bedrock": "^0.4.8",
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"@arizeai/openinference-instrumentation-langchain": "^3.4.6",
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"@aws-lambda-powertools/logger": "^2.30.0",
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"@aws-sdk/credential-provider-node": "^3.948.0",
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"@langchain/aws": "^1.1.0",
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"@langchain/classic": "^1.0.6",
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"@langchain/core": "^1.1.5",
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"@langchain/langgraph": "^1.0.4",
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"@langchain/mcp-adapters": "^1.1.0",
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"@langchain/openai": "^1.2.0",
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"@opentelemetry/api": "^1.9.0",
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"@opentelemetry/exporter-trace-otlp-http": "^0.206.0",
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"@opentelemetry/exporter-trace-otlp-proto": "^0.206.0",
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"@opentelemetry/instrumentation": "^0.206.0",
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"@opentelemetry/resources": "^2.2.0",
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"@opentelemetry/sdk-node": "^0.206.0",
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"@opentelemetry/sdk-trace-base": "^2.2.0",
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"@opentelemetry/sdk-trace-node": "^2.2.0",
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"@opentelemetry/semantic-conventions": "^1.38.0",
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"@smithy/eventstream-codec": "^4.2.5",
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"constructs": "^10.4.4",
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"langchain": "^1.2.0",
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"source-map-support": "^0.5.21",
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"uuid": "^13.0.0",
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"zod": "^4.1.13"
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}
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}

‎agents/agent-langchain/src/index.ts‎

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import { MultiServerMCPClient } from "@langchain/mcp-adapters";
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import { createAgent } from "langchain";
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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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context7: {
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command: 'npx',
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args: ['-y', '@upstash/context7-mcp@latest'],
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},
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});
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const tools = await client.getTools();
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const agent = createAgent({
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model: "bedrock:global.amazon.nova-2-lite-v1:0",
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systemPrompt: `
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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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tools,
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});
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const stream = await agent.stream({
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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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}, { streamMode: "values" });
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for await (const chunk of stream) {
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console.log('Agent', chunk.messages);
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}
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process.exit(0);

‎agents/agent-langchain/tsconfig-eslint.json‎

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{
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"extends": "./tsconfig-test.json",
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"include": [
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"eslint.config.*s",
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"vitest.config.ts",
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"bin/**/*.ts",
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"lib/**/*.ts",
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"lambda/**/*.ts",
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"test/**/*.ts"
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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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]
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}

‎agents/agent-langchain/tsconfig-test.json‎

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{
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"extends": "./tsconfig.json",
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"compilerOptions": {
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"noEmit": true
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},
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"include": [
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"vitest.config.ts"
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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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]
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}

‎agents/agent-langchain/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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}

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