mcp-server

atmosphere

Name: atmosphere
Author: Atmosphere

Portable AI agent runtime for the JVM. One @Agent class runs on Spring AI, LangChain4j, Anthropic, or 9 more behind one SPI. Token streaming, tool calls, human approvals, and governance over WebSocket, SSE, gRPC, or WebTransport/HTTP3. Speaks MCP, A2A, and AG-UI.

3,821 stars764 forksJavaUpdated 10/22/2026100% free · open source

About this skill

Portable AI agent runtime for the JVM. One @Agent class runs on Spring AI, LangChain4j, Anthropic, or 9 more behind one SPI. Token streaming, tool calls, human approvals, and governance over WebSocket, SSE, gRPC, or WebTransport/HTTP3. Speaks MCP, A2A, and AG-UI.

Use with Claude

New

Skip the builder — one click puts this in Claude, Cursor, Antigravity and more.

🛠️ Technical setup

Expect 20–40 minutes in a terminal — or let your AI agent drive it.

Try it instantly — no install

Claude Code

mkdir -p ~/.claude/skills/atmosphere && curl -fsSL https://workflowstacks.com/api/skills/atmosphere/claude-skill -o ~/.claude/skills/atmosphere/SKILL.md

Open in another AI app

Opens the app with this repo with the prompt ready to go — no copy-paste needed.

Connect the whole catalog (MCP)

claude mcp add --transport http workflowstacks https://workflowstacks.com/api/mcp

Adds a WorkflowStacks connector to Claude Code: search and load any skill here by chatting.

How atmosphere works

Codeflow

Free to inspect

Atmosphere is a very large Java project (~395k lines across 2085 code files, plus 1739 test files). It is a full software project: use it through its install path rather than reading it end to end. Last commit this month, Apache-2.0 license, has a test suite.

Size

Very large codebase

~395k lines · 2085 code files · days to read — use, don't read

Setup

Developer setup

A real software project. Use it via its install path; don't expect to read it all.

Runs on

Java/JVM

No API keys detected

Java 83%TypeScript 8%Shell 4%Kotlin 2%Vue 1%

Where to start reading

1
README.md
Start here — what it does and how to install it
2
AGENTS.md
The instructions the AI actually follows
3
modules/agent/README.md
Inside modules/agent/ — an example of what the AI is told to do
4
samples/README.md
A worked example — copy this to get going

What's in each folder

modules/agent/Prompts, skills & agent definitions42 files

modules/skills/Prompts, skills & agent definitions17 files

cli/Command-line entry points12 files

samples/Examples you can copy472 files

docs/Documentation7 files

modules/ai/Package1079 files

modules/cpr/Package590 files

modules/integration-tests/Package253 files

READMEHas testsDocumentedCI checksExamples includedApache-2.0 licenseUpdated this month

Use with Claude

New

Skip the builder — one click puts this in Claude, Cursor, Antigravity and more.

🛠️ Technical setup

Expect 20–40 minutes in a terminal — or let your AI agent drive it.

Try it instantly — no install

Claude Code

mkdir -p ~/.claude/skills/atmosphere && curl -fsSL https://workflowstacks.com/api/skills/atmosphere/claude-skill -o ~/.claude/skills/atmosphere/SKILL.md

Open in another AI app

Opens the app with this repo with the prompt ready to go — no copy-paste needed.

Connect the whole catalog (MCP)

claude mcp add --transport http workflowstacks https://workflowstacks.com/api/mcp

Adds a WorkflowStacks connector to Claude Code: search and load any skill here by chatting.

Quick Actions

Details

Creator

Atmosphere

Language

Java