MCP Failure Lab

io.github.cloudlabworks/mcp-failure-lab

Deliberately faulty MCP server for testing how agent clients handle tool errors and disconnects.

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Connect this server

Add this to your MCP client config — claude_desktop_config.json (Claude Desktop) or .cursor/mcp.json (Cursor).Suits: Claude Desktop · Cursor.

{
  "mcpServers": {
    "mcp-failure-lab": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "ghcr.io/cloudlabworks/mcp-failure-lab:0.1.2"
      ],
      "env": {
        "LAB_SCENARIO": "healthy",
        "LAB_DELAY_MS": "1000",
        "LAB_FAILURES": "2"
      }
    }
  }
}
Environment variables
  • LAB_SCENARIOFault to inject: healthy, tool-error, transient-error, delay, malformed, or disconnect
  • LAB_DELAY_MSDelay in milliseconds for the delay scenario (0 to 10000)
  • LAB_FAILURESFailing calls before success for the transient-error scenario (0 to 10)

A starting point — check the repository for exact arguments and setup. Restart your client after editing the config.

Category
Developer Tools
Version
0.1.2
Registry
active
Published
11/3/2026

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