Fiddler Everywhere Agent Skills

This repository contains official agent skills built exclusively for Fiddler Everywhere — the cross-platform web debugging proxy by Progress Telerik. All skills in this repo require Fiddler Everywhere to be installed and running on the user's machine; they are not compatible with Fiddler Classic or any other proxy tool.

These skills extend agents (GitHub Copilot, Claude Code, Cursor, Codex, etc.) with the ability to directly interact with Fiddler Everywhere through its MCP (Model Context Protocol) server. Once connected, the agent can capture, inspect, and analyze live HTTP/HTTPS traffic without the user having to leave their editor.

Use these skills any time you want your AI coding agent to reason about real network traffic rather than relying on guesses or static code analysis alone.

Installation

Quick install (via skills.sh)

The fastest way to install all Fiddler skills is through the skills CLI — no manual file placement needed:

npx skills add telerik/fiddler-agent-tools

This automatically detects your agent and places the skill files in the correct directory.

To install a single skill:

npx skills add telerik/fiddler-agent-tools/fiddler-mcp-setup
npx skills add telerik/fiddler-agent-tools/fiddler-download-setup
npx skills add telerik/fiddler-agent-tools/fiddler-traffic-debugging

Manual setup

If you prefer to install skills manually, clone this repository and copy the skill folders to the appropriate directory for your agent.

git clone https://github.com/telerik/fiddler-agent-tools.git

Then copy the contents of the skills/ folder to the matching path:

Agent	Skills directory
GitHub Copilot (VS Code)	~/.copilot/skills/ (macOS/Linux) · %USERPROFILE%\.copilot\skills\ (Windows)
Cursor	~/.cursor/skills/ (macOS/Linux) · %USERPROFILE%\.cursor\skills\ (Windows)
Claude Code	~/.claude/skills/
Claude Desktop	~/.claude/skills/
GitHub Copilot CLI	~/.copilot/skills/
OpenAI Codex CLI	~/.codex/skills/

For example, on macOS/Linux for GitHub Copilot in VS Code:

mkdir -p ~/.copilot/skills
cp -r skills/* ~/.copilot/skills/

Each skill folder must contain its SKILL.md file. After copying, your agent will automatically detect and use the skills when a matching request is made.

What are skills?

Skills are instruction files that teach coding agents (GitHub Copilot, Claude Code, Cursor, Codex, VsCode, etc.) how to perform specific tasks. Each skill lives in its own folder as a SKILL.md file and is loaded by the agent when the user's request matches the skill's description.

Skills

Skill	Description
fiddler-download-setup	Download, install, and launch Fiddler Everywhere from scratch.
fiddler-mcp-setup	Connect your agent to the Fiddler Everywhere MCP server. Use this when Fiddler tools aren't available in your agent session.
fiddler-traffic-debugging	Verify that a feature's HTTP calls completed correctly by analyzing captured traffic, grouped by endpoint.

Prerequisites

If you haven't set up Fiddler with your agent yet, start with the fiddler-mcp-setup skill or fiddler-download-setup if you don't have Fiddler installed at all.