CyberChef API MCP Server

What is CyberChef API MCP Server?

CyberChef API MCP Server is a Model Context Protocol (MCP) server that interfaces with the CyberChef Server API. It allows any LLM or MCP client to use the tools and resources within CyberChef.

How to use CyberChef API MCP Server?

Start the server by setting the CYBERCHEF_API_URL environment variable to a running CyberChef API instance and running uv run cyberchef_api_mcp_server. For development, use mcp dev server.py. After installation, a client configuration file can be generated and tweaked to include the environment variable.

Key features of CyberChef API MCP Server

• Provides resources for listing CyberChef operation categories
• Provides resources for listing operations by category
• Offers a tool to execute a single recipe on input data
• Offers a tool to execute a recipe on a batch of inputs
• Offers a magic tool to auto‑detect encoding and suggest operations

Use cases of CyberChef API MCP Server

• Decode or encode data using any CyberChef operation via an LLM client
• Automatically detect unknown encoding and suggest decodings with the magic operation
• Apply a batch of recipes to multiple inputs in one call
• Explore available CyberChef operations and their categories for tool selection
• Integrate CyberChef functionality into MCP‑compatible assistants like Claude Desktop

FAQ from CyberChef API MCP Server

What prerequisites are needed to run CyberChef API MCP Server?

You need a running CyberChef API instance (or one you can access) and set the CYBERCHEF_API_URL environment variable. For the demo, Claude Desktop is also required.

How do I start the server?

Use the command CYBERCHEF_API_URL="your-cyberchef-api-url" uv run cyberchef_api_mcp_server. For development, run mcp dev server.py.

What transport does the server use?

It uses stdio transport by default.

What tools and resources are available?

Resources: get_cyberchef_operations_categories, get_cyberchef_operation_by_category. Tools: bake_recipe, batch_bake_recipe, perform_magic_operation.

Is there a way to automatically detect data encoding?

Yes, the perform_magic_operation tool automatically detects how your data is encoded and suggests which operations can decode it.