Containarium v0.103.3

What changed

Internal

• cut v0.103.3 — mcp-server works with Claude Code and lists its tools for a box token (#2533)

Other

• [#2529] fix(mcp): never reply to a notification; list tools for a box token (#2531)

Full diff: v0.103.2...v0.103.3

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Containarium v0.103.3

The open-source, self-hostable, agent-native sandbox.

Binaries

Four binaries ship in this release:

Binary	Where it runs	What it does
containariumd	The host	The platform daemon plus host-side admin commands.
containarium	Your laptop / CI (linux, macOS, windows)	The client CLI: create, list, expose-port, ssh-config, etc. against a server (--server).
mcp-server	Your laptop	The platform MCP — outside-the-box admin (create_container, list_containers, expose_port, list_backends). Wire it into Claude Code / Cursor.
agent-box	Inside each Containarium container	The in-the-box MCP — shell_exec, read_file, write_file, etc. Reached over stdio, typically via SSH.

Quick install (Linux host)

curl -fsSL https://raw.githubusercontent.com/footprintai/containarium/main/hacks/install.sh | sudo bash

Manual install (any binary, any platform)

# containariumd daemon (Linux x86_64 host)
curl -L -o /usr/local/bin/containariumd \
  https://github.com/footprintai/containarium/releases/download/v0.103.3/containariumd-linux-amd64
chmod +x /usr/local/bin/containariumd
ln -sf /usr/local/bin/containariumd /usr/local/bin/containarium

# containarium client CLI (your laptop, e.g. macOS arm64)
curl -L -o /usr/local/bin/containarium \
  https://github.com/footprintai/containarium/releases/download/v0.103.3/containarium-darwin-arm64
chmod +x /usr/local/bin/containarium

# Windows: the same client CLI (create/list/ssh/… against a remote server)
# PowerShell:
#   curl.exe -L -o containarium.exe `
#     https://github.com/footprintai/containarium/releases/download/v0.103.3/containarium-windows-amd64.exe

# platform MCP (your laptop, e.g. macOS arm64)
curl -L -o /usr/local/bin/mcp-server \
  https://github.com/footprintai/containarium/releases/download/v0.103.3/mcp-server-darwin-arm64
chmod +x /usr/local/bin/mcp-server

# agent-box (drop into your container image, Linux x86_64)
curl -L -o /usr/local/bin/agent-box \
  https://github.com/footprintai/containarium/releases/download/v0.103.3/agent-box-linux-amd64
chmod +x /usr/local/bin/agent-box

Verify checksums via SHA256SUMS.txt.

MCP client setup

Wire the platform MCP into Claude Code (~/.claude.json):

{
  "mcpServers": {
    "containarium": {
      "command": "/usr/local/bin/mcp-server",
      "env": {
        "CONTAINARIUM_SERVER_URL": "http://your-host:8080",
        "CONTAINARIUM_JWT_TOKEN": "<your-token>"
      }
    }
  }
}

Wire agent-box for in-the-box file/shell ops:

{
  "mcpServers": {
    "containarium-box": {
      "command": "ssh",
      "args": ["user@your-box", "agent-box"]
    }
  }
}

See README.md for the full agent-native walkthrough.