Chaos Rig MCP Server

@Typewise

Basic information

About Chaos Rig MCP Server

A local MCP server that breaks on demand. Test your client against auth failures, disappearing tools, flaky responses, and token expiry, all from a web UI.

Chaos Rig MCP Server config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "mcp-chaos-rig": {
      "command": "npx",
      "args": [
        "mcp-chaos-rig"
      ]
    }
  }
}

Chaos Rig MCP Server tools

returns your message (v2 adds format options)

sums two numbers (v2 accepts an array)

current server time as ISO 8601

random integer in a range

reverses a string

echoes one optional parameter per JSON Schema primitive, to check a client round-trips every type

files a billing dispute, returns a JSON receipt

contacts`, `get-contact-by-id`, `get-contact-by-email`, `search-contacts`, `create-contact`, `update-contact`, `delete-contact`: SQLite CRUD

Overview

What is Chaos Rig?

A local MCP server that breaks on demand. Test your client against auth failures, disappearing tools, flaky responses, and token expiry, all from a web UI.

How to use Chaos Rig?

The README includes setup instructions such as npx mcp-chaos-rig.

Key features of Chaos Rig

Break authentication: force 401s and 500s mid-session, expire tokens on demand, reject refresh tokens
Break tools: disable tools to trigger tools/changed, switch schema versions live
Break reliability: add random latency, make tool calls fail at configurable rates
registration_endpoint disappears from the well-known metadata
POST /oauth/register and POST /register return 404 registration_not_supported

Use cases of Chaos Rig

Connect an MCP-compatible client to this repository's service.
Review the README-backed setup before enabling it in production.

Frequently asked questions

Where is the source code for Chaos Rig?

The source code is linked from the repository URL on this page.

Does Chaos Rig include a standard MCP config?

If the README contains a parseable MCP configuration block, it is shown in the Config tab.

Comments

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