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SandBase Harness

SandBase Harness is an MCP server that adds cloud and DevOps tools to AI assistants such as Claude Desktop, Claude Code and Cursor. Stdio MCP bridge for SandBase Harness agents, sessions, turns, artifacts, and… It has 636 GitHub stars, is released under the Apache-2.0 license and runs locally with docker run -i --rm -e MANAGED_AGENTS_URL -e MANAGED_AGENTS_API_KEY ghcr.io/sandbaseai/sandbase-harness-mcp:0.3.8.

github.com/sandbaseai/sandbase-harness (opens in a new tab)

Data as of from the GitHub API and the official MCP registry; description from the project's repository. Report an error

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Install SandBase Harness

Generated from the server's MCP registry entry. Replace your-value with your own values.

Claude Desktop

claude_desktop_config.json
{
  "mcpServers": {
    "sandbase-harness": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-e",
        "MANAGED_AGENTS_URL",
        "-e",
        "MANAGED_AGENTS_API_KEY",
        "ghcr.io/sandbaseai/sandbase-harness-mcp:0.3.8"
      ],
      "env": {
        "MANAGED_AGENTS_URL": "your-value",
        "MANAGED_AGENTS_API_KEY": "your-value"
      }
    }
  }
}

Settings > Developer > Edit Config. macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\. Restart Claude Desktop afterwards.

Claude Code

claude mcp add --env MANAGED_AGENTS_URL=your-value --env MANAGED_AGENTS_API_KEY=your-value --transport stdio sandbase-harness -- docker run -i --rm -e MANAGED_AGENTS_URL -e MANAGED_AGENTS_API_KEY ghcr.io/sandbaseai/sandbase-harness-mcp:0.3.8

Cursor

.cursor/mcp.json
{
  "mcpServers": {
    "sandbase-harness": {
      "type": "stdio",
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-e",
        "MANAGED_AGENTS_URL",
        "-e",
        "MANAGED_AGENTS_API_KEY",
        "ghcr.io/sandbaseai/sandbase-harness-mcp:0.3.8"
      ],
      "env": {
        "MANAGED_AGENTS_URL": "your-value",
        "MANAGED_AGENTS_API_KEY": "your-value"
      }
    }
  }
}

Project file; use ~/.cursor/mcp.json to enable it in every project.

VS Code

.vscode/mcp.json
{
  "inputs": [
    {
      "type": "promptString",
      "id": "managed_agents_api_key",
      "description": "MANAGED_AGENTS_API_KEY",
      "password": true
    }
  ],
  "servers": {
    "sandbase-harness": {
      "type": "stdio",
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-e",
        "MANAGED_AGENTS_URL",
        "-e",
        "MANAGED_AGENTS_API_KEY",
        "ghcr.io/sandbaseai/sandbase-harness-mcp:0.3.8"
      ],
      "env": {
        "MANAGED_AGENTS_URL": "your-value",
        "MANAGED_AGENTS_API_KEY": "${input:managed_agents_api_key}"
      }
    }
  }
}

Config formats checked against the official docs on Oct 7, 2026: modelcontextprotocol.io (opens in a new tab), code.claude.com (opens in a new tab), cursor.com (opens in a new tab), code.visualstudio.com (opens in a new tab).

Environment variables

Variables the server reads at startup.

NameRequiredDescription
MANAGED_AGENTS_URLYesURL of the SandBase Harness runtime API.
MANAGED_AGENTS_API_KEYsecretNoAPI key when the connected Harness runtime requires authentication.

About SandBase Harness

AI-readable project metadata: llms.txt · installation guide A local-first runtime for AI agents. Sessions, sandboxed tools, memory, credentials, audit trails, and a built-in Console — all running on your machine or in your own infrastructure.

  • agent-observability
  • agent-runtime
  • ai-agents
  • deepseek-harness
  • mcp-server
  • model-context-protocol
  • agent-sandbox
  • ai-infrastructure
  • local-first
  • self-hosted

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FAQ

SandBase Harness FAQ

Still curious? Email info@appsgit.com.

How do I install the SandBase Harness MCP server?

Add the command docker run -i --rm -e MANAGED_AGENTS_URL -e MANAGED_AGENTS_API_KEY ghcr.io/sandbaseai/sandbase-harness-mcp:0.3.8 to your MCP client: put it in claude_desktop_config.json for Claude Desktop, run claude mcp add for Claude Code, or add it to .cursor/mcp.json (Cursor) or .vscode/mcp.json (VS Code). The snippets on this page are ready to paste.

Is SandBase Harness free?

The server is open source under the Apache-2.0 license, so running it is free. It needs credentials (MANAGED_AGENTS_API_KEY) for the service it connects to, which may require a paid account.

Is SandBase Harness actively maintained?

The most recent commit was on Oct 12, 2026. The latest release is v0.3.8, published Aug 30, 2026. appsgit only lists MCP servers with a commit in the last six months.