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Atmosphere
A portable AI agent runtime for the JVM that runs on Spring AI, LangChain4j, Anthropic and more.
Day 43 since launch · Launched 25 August 2026
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What is Atmosphere?
Atmosphere is a portable AI agent runtime for the JVM. One @Agent class runs on Spring AI, LangChain4j, Anthropic or nine more backends, with token streaming, tool calls, human approvals and governance over WebSocket, SSE, gRPC or HTTP/3. It speaks MCP, A2A and AG-UI.
Pros
- One agent class runs on many AI backends
- Supports MCP, A2A and AG-UI
- Apache-2.0 licensed with 3,800+ stars
Cons
- Java and JVM only
- Large surface area to learn
Who should use Atmosphere
Java developers building portable AI agents.
Who may not need it
Developers outside the JVM ecosystem.
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