Google ADK Tutorial 06 : Turn Any REST API into an AI Agent Tool ( OpenAPI + LangChain ) !!

This Google ADK tutorial demonstrates how to convert any REST API into an AI agent tool using OpenAPI specifications and LangChain. The module covers integrating third-party APIs with AI agents, leveraging OpenAPI schemas to automatically generate tool definitions, and using LangChain to manage API interactions. This approach enables agents to dynamically call external services while maintaining type safety and proper documentation.

Key Points

• •Use OpenAPI specifications to define REST API contracts and automatically generate AI agent tool definitions
• •Leverage LangChain's built-in tools for wrapping REST APIs and handling authentication
• •Convert OpenAPI schemas into structured tool descriptions that agents can understand and execute
• •Implement proper error handling and response parsing when agents call external REST endpoints
• •Use API keys and authentication headers securely within agent tool configurations
• •Test agent-to-API interactions to ensure correct parameter passing and response handling
• •Chain multiple API calls together within a single agent workflow for complex operations
• •Document API endpoints with OpenAPI to enable automatic tool generation and discoverability

Workflow Diagram

Concepts