a2aproject/a2a-python

a2a-python is a Python SDK for building agentic applications as A2A Servers following the Agent2Agent Protocol.

The SDK addresses the need for standardized communication between autonomous agents by implementing the A2A Protocol specification. It provides a framework for building agent applications that can interoperate across different systems and transports. The tool handles protocol compliance, message routing, and agent lifecycle management, allowing developers to focus on agent logic rather than protocol implementation details.

Developers should adopt this SDK if they are building agent-based systems that need to communicate via the A2A Protocol or integrate with other A2A-compliant agents. It suits projects requiring multi-agent coordination, whether deployed as HTTP services, gRPC endpoints, or JSON-RPC servers. The SDK's modular design means you can install only the components you need—the core library alone, or with optional integrations for FastAPI, gRPC, OpenTelemetry tracing, and SQL database backends including PostgreSQL, MySQL, and SQLite. The tool supports both the current protocol specification and maintains backward compatibility with an earlier version, making it suitable for both new projects and those migrating from older implementations.

The project maintains active development with regular updates addressing protocol compliance and feature additions. The codebase includes comprehensive examples demonstrating common patterns, and the maintainers provide migration documentation for users upgrading between major versions. The SDK is built on asynchronous Python primitives, enabling high-performance concurrent agent operations. The project's extensibility is a core design principle, allowing custom implementations of communication protocols and database backends beyond the included integrations.