CTFd MCP Server

A lightweight and extensible Model Context Protocol (MCP) server for interacting with any CTFd instance. This project enables AI tools and automation to authenticate, retrieve challenges, and submit flags through MCP tools.

This project acts as a bridge between CTFd and AI-driven systems by providing a unified interface. It supports multiple authentication modes, dynamic base URL control, and direct MCP tool integration.

The server is validated using the official demo instance athttps://demo.ctfd.io.

pnpm install -g ctfd-mcp-server ctfd-mcp-server

git clone https://github.com/tomek7667/ctfd-mcp-server.git cd ctfd-mcp-server pnpm install pnpm run build pnpm start

{ "mcpServers": { "ctfd": { "command": "npx", "args": ["-y", "ctfd-mcp-server"], "env": { "BASE_URL": "https://demo.ctfd.io", "CTFD_TOKEN": "<your ctfd api token>" } } } }

{ "mcpServers": { "ctfd": { "command": "ctfd-mcp-server", "env": { "BASE_URL": "https://demo.ctfd.io", "CTFD_TOKEN": "<your ctfd api token>" } } } }

Restart Claude Desktop after editing the config.

Codex CLI stores MCP configuration in~/.codex/config.toml.

codex mcp add ctfd -- npx -y ctfd-mcp-server

[mcp_servers.ctfd] command = "npx" args = ["-y", "ctfd-mcp-server"] [mcp_servers.ctfd.env] BASE_URL = "https://demo.ctfd.io" CTFD_TOKEN = "<your ctfd api token>"

Use/mcpin the Codex TUI to verify the server is connected.

Amp supports MCP servers via theamp.mcpServerssetting in VS Codesettings.json.

- macOS:~/Library/Application Support/Code/User/settings.json
- Windows:%APPDATA%\Code\User\settings.json
- Linux:~/.config/Code/User/settings.json

{ "amp.mcpServers": { "ctfd": { "command": "npx", "args": ["-y", "ctfd-mcp-server"], "env": { "BASE_URL": "https://demo.ctfd.io", "CTFD_TOKEN": "<your ctfd api token>" } } } }

Gemini CLI stores MCP configuration in~/.gemini/settings.json.

{ "mcpServers": { "ctfd": { "command": "npx", "args": ["-y", "ctfd-mcp-server"], "env": { "BASE_URL": "https://demo.ctfd.io", "CTFD_TOKEN": "<your ctfd api token>" } } } }

gemini mcp add ctfd npx -- -y ctfd-mcp-server

Use/mcpin Gemini CLI to verify server status.

docker build -t ctfd-mcp-server . docker run -i ctfd-mcp-server

For clients that support Docker-based MCP servers:

{ "mcpServers": { "ctfd": { "command": "docker", "args": ["run", "-i", "--rm", "ctfd-mcp-server"] } } }

# Clone and install git clone https://github.com/tomek7667/ctfd-mcp-server.git cd ctfd-mcp-server pnpm install # Build pnpm run build # Run pnpm start # Watch mode (auto-rebuild) pnpm run watch

For support, emailjamescotid@gmail.comor open an issue through the GitHub repository. Community contributions and improvements are always welcome.

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