Caldera

MCP server for MITRE Caldera adversary emulation platform.

Connects any MCP-compatible AI client (Claude, Cursor, VS Code, etc.) to a running Caldera instance. Build attack scenarios from natural language, inspect connected agents, and manage operations — all through conversation.

Important: This tool connects an AI to a live adversary emulation platform. Only point it at Caldera instances you own and are authorized to operate. Always review scope before executing any operation.

---

Tools (17)

Group	Tools
Health	caldera_health_check
Agents	caldera_list_agents, caldera_get_agent
Abilities	caldera_list_abilities, caldera_get_ability, caldera_create_ability, caldera_delete_ability
Adversaries	caldera_list_adversaries, caldera_get_adversary, caldera_create_adversary, caldera_update_adversary, caldera_delete_adversary
Operations	caldera_list_operations, caldera_get_operation, caldera_create_operation, caldera_set_operation_state, caldera_get_operation_results, caldera_delete_operation

Key behaviors:

• caldera_list_abilities supports filters: technique_id, tactic, platform
• caldera_create_operation defaults to state="paused" — operations never start automatically
• Input validation enforced on technique IDs (ATT&CK format), platforms, and executors

---

Requirements

• Python 3.12+ or Docker
• A running MITRE Caldera instance (v5.x)
• The Caldera red team API key

---

Installation

uvx — zero install (recommended)

Requires uv.

CALDERA_URL=http://my-caldera:8888 \
CALDERA_API_KEY=your-red-api-key \
uvx caldera-mcp

pip

pip install caldera-mcp
CALDERA_URL=http://my-caldera:8888 CALDERA_API_KEY=your-red-api-key caldera-mcp

Docker (SSE / server mode)

docker run --rm \
  -e CALDERA_URL=http://my-caldera:8888 \
  -e CALDERA_API_KEY=your-red-api-key \
  -p 8081:8081 \
  ghcr.io/cowboy-samurai/caldera-mcp \
  --transport sse

---

Configuration

Variable	Required	Default	Description
CALDERA_API_KEY	Yes	—	Caldera red team API key
CALDERA_URL	No	http://localhost:8888	Caldera server base URL

The red team API key can be found in your Caldera config (conf/local.yml → api_key_red), or in the container logs if auto-generated.

---

MCP client setup

Claude Code

Add to .mcp.json in your project root:

{
  "mcpServers": {
    "caldera": {
      "command": "uvx",
      "args": ["caldera-mcp"],
      "env": {
        "CALDERA_URL": "http://my-caldera:8888",
        "CALDERA_API_KEY": "your-red-api-key"
      }
    }
  }
}

Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "caldera": {
      "command": "uvx",
      "args": ["caldera-mcp"],
      "env": {
        "CALDERA_URL": "http://my-caldera:8888",
        "CALDERA_API_KEY": "your-red-api-key"
      }
    }
  }
}

SSE mode (remote Caldera)

If your Caldera instance is remote and you want the MCP server to run as a persistent process:

caldera-mcp --transport sse --host 127.0.0.1 --port 8081

Then configure your client to connect via SSE:

{
  "mcpServers": {
    "caldera": {
      "type": "sse",
      "url": "http://localhost:8081/sse"
    }
  }
}

---

Usage examples

Once connected, talk to your AI client naturally:

List all alive agents

Find abilities for T1059.001 on Windows

Create an adversary from these techniques: T1566.001, T1059.001, T1003.001

What operations are currently running?

Operations created through this server default to paused state. Always review scope — techniques, commands, and targeted hosts — before resuming any operation.

---

License

Apache 2.0