Google Agent Development Kit
Google’s open-source framework for agents and multi-agent systems
Verdict
Now on a 2.x line with frequent releases, and strong if you are on Google Cloud. Version 2.13 moved its default telemetry to a newer OpenTelemetry GenAI schema, so pin versions and check dashboards when you upgrade.
Other AI Agents & Platforms
- OpenAI Responses APIProduction
OpenAI's current API for building agents — merges Chat Completions simplicity with Assistants-era tool use
- OpenAI Assistants APISuperseded
Managed agent platform with tools, files, and persistent threads — shut down in favour of the Responses API
- Claude MCP / Tool UseProduction
Anthropic's Model Context Protocol for universal tool integration
- Microsoft Copilot StudioProduction
Enterprise agent builder with Microsoft 365 and Azure integration
- AutoGenSuperseded
Microsoft's multi-agent conversation framework — succeeded by Microsoft Agent Framework
- CrewAIStable
Role-based multi-agent framework with simple, intuitive API