Add Fiddler Everywhere skills #2416
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| --- | ||
| name: fiddler-download-setup | ||
| description: 'Download, install, and launch Fiddler Everywhere from scratch, then configure MCP for AI agent tools. Use this skill when the user does not have Fiddler installed, says "download Fiddler", "install Fiddler Everywhere", "get started with Fiddler", "first time Fiddler setup", "set up Fiddler from scratch", or needs a complete onboarding from zero to a working Fiddler MCP connection.' | ||
| --- | ||
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| # Fiddler Download & Setup | ||
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| Guide the user through downloading, installing, and launching Fiddler Everywhere. | ||
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| ## Operating rules | ||
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| 1. This skill is shell-first. Fiddler is not installed yet, so no MCP tools are available. | ||
| 2. Resolve the current version from the manifest before constructing any download URL. | ||
| Never hardcode a version number. | ||
| 3. On Windows - detect opened terminal. Only if it is not powershell - wrap and run the scripts with: powershell.exe -Command 'script'. Use single quotes to wrap the script! | ||
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| --- | ||
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| ## Phase 1 — Check if Fiddler is already installed | ||
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| Before downloading, check whether Fiddler Everywhere is already installed. | ||
| If it is installed, also read the installed version and compare it against the latest | ||
| available release. Only proceed to Phase 2 if the app is not installed or an update | ||
| is available and the user wants to upgrade. | ||
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| ### macOS — detect and version-check | ||
| ```bash | ||
| if [ -d "/Applications/Fiddler Everywhere.app" ]; then | ||
| INSTALLED_VERSION=$(/usr/libexec/PlistBuddy -c "Print CFBundleShortVersionString" \ | ||
| "/Applications/Fiddler Everywhere.app/Contents/Info.plist" 2>/dev/null) | ||
| echo "INSTALLED: $INSTALLED_VERSION" | ||
| else | ||
| echo "NOT_INSTALLED" | ||
| fi | ||
| ``` | ||
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| If `INSTALLED`, fetch the latest version for the detected architecture and compare: | ||
| ```bash | ||
| ARCH=$(uname -m) | ||
| if [ "$ARCH" = "arm64" ]; then | ||
| MANIFEST_URL="https://downloads.getfiddler.com/mac-arm64/latest-mac.yml" | ||
| else | ||
| MANIFEST_URL="https://downloads.getfiddler.com/mac/latest-mac.yml" | ||
| fi | ||
| LATEST_VERSION=$(curl -s "$MANIFEST_URL" | grep '^version:' | awk '{print $2}') | ||
| echo "Installed: $INSTALLED_VERSION | Latest: $LATEST_VERSION" | ||
| if [ "$INSTALLED_VERSION" = "$LATEST_VERSION" ]; then | ||
| echo "UP_TO_DATE" | ||
| else | ||
| echo "UPDATE_AVAILABLE" | ||
| fi | ||
| ``` | ||
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| ### Linux — detect and version-check | ||
| ```bash | ||
| APPIMAGE=$(ls ~/Downloads/fiddler-everywhere-*.AppImage 2>/dev/null | sort -V | tail -1) | ||
| if command -v fiddler-everywhere &>/dev/null || [ -n "$APPIMAGE" ]; then | ||
| # Extract version from AppImage filename as the most reliable source | ||
| INSTALLED_VERSION=$(echo "$APPIMAGE" | grep -oP '[\d]+\.[\d]+\.[\d]+') | ||
| echo "INSTALLED: $INSTALLED_VERSION" | ||
| LATEST_VERSION=$(curl -s "https://downloads.getfiddler.com/linux/latest-linux.yml" \ | ||
| | grep '^version:' | awk '{print $2}') | ||
| echo "Installed: $INSTALLED_VERSION | Latest: $LATEST_VERSION" | ||
| if [ "$INSTALLED_VERSION" = "$LATEST_VERSION" ]; then | ||
| echo "UP_TO_DATE" | ||
| else | ||
| echo "UPDATE_AVAILABLE" | ||
| fi | ||
| else | ||
| echo "NOT_INSTALLED" | ||
| fi | ||
| ``` | ||
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| ### Windows (PowerShell) — detect and version-check | ||
| ```powershell | ||
| $installed = Get-ItemProperty ` | ||
| "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*", | ||
| "HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*", | ||
| "HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\*" ` | ||
| -ErrorAction SilentlyContinue | | ||
| Where-Object { $_.DisplayName -like "*Fiddler Everywhere*" } | ||
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| if ($installed) { | ||
| $installedVersion = $installed.DisplayVersion | ||
| Write-Host "INSTALLED: $installedVersion" | ||
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| $manifest = Invoke-WebRequest "https://downloads.getfiddler.com/win/latest.yml" -UseBasicParsing | ||
| $text = [System.Text.Encoding]::UTF8.GetString($manifest.RawContentStream.ToArray()) | ||
| $latestVersion = ($text | Select-String '(?m)^version:\s*(.+)').Matches.Groups[1].Value.Trim() | ||
| Write-Host "Installed: $installedVersion | Latest: $latestVersion" | ||
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| if ($installedVersion -eq $latestVersion) { "UP_TO_DATE" } else { "UPDATE_AVAILABLE" } | ||
| } else { | ||
| "NOT_INSTALLED" | ||
| } | ||
| ``` | ||
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| **Interpreting the result:** | ||
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| - `NOT_INSTALLED` — continue to Phase 2 to download and install. | ||
| - `UP_TO_DATE` — inform the user their Fiddler Everywhere is already on the latest version | ||
| and stop further execution of the skill. | ||
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| - `UPDATE_AVAILABLE` — tell the user the installed version and the latest version, then ask | ||
| whether they want to upgrade. If yes, continue to Phase 2 (the new installer will replace | ||
| the existing one). If no, stop. | ||
| --- | ||
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| ## Phase 2 — Detect OS and resolve version | ||
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| Run both commands together. The manifest probe also confirms network access. | ||
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| ```bash | ||
| uname -s && uname -m | ||
| VERSION=$(curl -s "https://downloads.getfiddler.com/mac-arm64/latest-mac.yml" \ | ||
| | grep '^version:' | awk '{print $2}') | ||
| echo "Latest Fiddler Everywhere: $VERSION" | ||
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| ``` | ||
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| On Windows (PowerShell): | ||
| ```powershell | ||
| $env:PROCESSOR_ARCHITECTURE # AMD64 or ARM64 | ||
| $manifest = Invoke-WebRequest "https://downloads.getfiddler.com/win/latest.yml" -UseBasicParsing | ||
| $text = [System.Text.Encoding]::UTF8.GetString($manifest.RawContentStream.ToArray()) | ||
| $VERSION = ($text | Select-String '(?m)^version:\s*(.+)').Matches.Groups[1].Value.Trim() | ||
| Write-Host "Latest Fiddler Everywhere: $VERSION" | ||
| ``` | ||
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| | `uname -s` | `uname -m` | Platform | | ||
| |-------------|------------|----------| | ||
| | `Darwin` | `arm64` | macOS Apple Silicon | | ||
| | `Darwin` | `x86_64` | macOS Intel | | ||
| | `Linux` | anything | Linux | | ||
| | — | — | Windows — use PowerShell path above | | ||
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| --- | ||
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| ## Phase 3 — Download | ||
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| Use `$VERSION` resolved in Phase 2 to construct a direct, versioned URL. | ||
| The `.pkg` format is preferred on macOS. | ||
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| ### macOS | ||
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| ```bash | ||
| # Apple Silicon (arm64) | ||
| curl -L \ | ||
| "https://agent-downloads.getfiddler.com/mac-arm64/Fiddler%20Everywhere%20${VERSION}.pkg" \ | ||
| -o ~/Downloads/FiddlerEverywhere.pkg | ||
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| # Intel (x86_64) | ||
| curl -L \ | ||
| "https://agent-downloads.getfiddler.com/mac/Fiddler%20Everywhere%20${VERSION}.pkg" \ | ||
| -o ~/Downloads/FiddlerEverywhere.pkg | ||
| ``` | ||
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| ### Linux | ||
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| ```bash | ||
| VERSION=$(curl -s "https://downloads.getfiddler.com/linux/latest-linux.yml" \ | ||
| | grep '^version:' | awk '{print $2}') | ||
| curl -L \ | ||
| "https://agent-downloads.getfiddler.com/linux/fiddler-everywhere-${VERSION}.AppImage" \ | ||
| -o ~/Downloads/FiddlerEverywhere.AppImage | ||
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martin-vladkov marked this conversation as resolved.
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| ``` | ||
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| ### Windows (PowerShell) | ||
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| ```powershell | ||
| Invoke-WebRequest ` | ||
| "https://agent-downloads.getfiddler.com/win/Fiddler%20Everywhere%20$VERSION.exe" ` | ||
| -OutFile "$env:USERPROFILE\Downloads\FiddlerEverywhere.exe" | ||
| ``` | ||
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| --- | ||
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| ## Phase 4 — Install | ||
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| ### macOS — PKG (headless, no wizard) | ||
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| Do **not** use `sudo installer` directly — `sudo` blocks on a password prompt inside | ||
| the agent's hidden shell where the user cannot type. Use `osascript` instead, which | ||
| raises the native macOS authentication dialog that the user can see on screen. | ||
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| `do shell script with administrator privileges` runs as root and cannot access | ||
| `~/Downloads` due to macOS sandbox restrictions. Copy the package to `/tmp` first | ||
| (world-readable), then install from there. | ||
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| Run both commands via bash tool calls: | ||
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| ```bash | ||
| cp ~/Downloads/FiddlerEverywhere.pkg /tmp/FiddlerEverywhere.pkg | ||
| ``` | ||
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| Then announce before the next command: | ||
| > "A macOS password dialog will appear on your screen. Enter your login password there | ||
| > to authorize the installation, then I'll continue automatically." | ||
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| ```bash | ||
| osascript -e 'do shell script "installer -pkg /tmp/FiddlerEverywhere.pkg -target /" with administrator privileges' | ||
| ``` | ||
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| `osascript` blocks until the user approves the dialog and the install completes. Once it | ||
| exits with code 0, clean up. | ||
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| ```bash | ||
| rm /tmp/FiddlerEverywhere.pkg | ||
| ``` | ||
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| ### Linux | ||
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| ```bash | ||
| chmod +x ~/Downloads/FiddlerEverywhere.AppImage | ||
| ~/Downloads/FiddlerEverywhere.AppImage & | ||
| ``` | ||
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| ### Windows — silent install | ||
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| ```powershell | ||
| Start-Process "$env:USERPROFILE\Downloads\FiddlerEverywhere.exe" -ArgumentList "/S" -Wait | ||
| ``` | ||
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| **Launch Fiddler:** | ||
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| macOS: | ||
| ```bash | ||
| open -a "Fiddler Everywhere" && sleep 15 | ||
| ``` | ||
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| Linux: | ||
| ```bash | ||
| (nohup "$HOME/Downloads/FiddlerEverywhere.AppImage" &>/dev/null &); sleep 15 | ||
| ``` | ||
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| Windows: | ||
| **Important** On windows if the current terminal used is bash, use the specific **GitBash** script. | ||
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| **PowerShell** | ||
| ```powershell | ||
| $candidates = @( | ||
| "$env:LOCALAPPDATA\Programs\Fiddler Everywhere\Fiddler Everywhere.exe", | ||
| "C:\Program Files\Fiddler Everywhere\Fiddler Everywhere.exe", | ||
| "C:\Program Files (x86)\Fiddler Everywhere\Fiddler Everywhere.exe" | ||
| ) | ||
| $fiddlerExe = $candidates | Where-Object { Test-Path $_ } | Select-Object -First 1 | ||
| if ($fiddlerExe) { | ||
| $cmdLine = '"' + $fiddlerExe + '"' | ||
| Invoke-CimMethod -ClassName Win32_Process -MethodName Create -Arguments @{ CommandLine = $cmdLine } | Out-Null | ||
| Start-Sleep 15 | ||
| } | ||
| ``` | ||
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| **Git Bash** | ||
| ```bash | ||
| FIDDLER_EXE="" | ||
| for dir in "$LOCALAPPDATA/Programs/Fiddler Everywhere" \ | ||
| "/c/Program Files/Fiddler Everywhere" \ | ||
| "/c/Program Files (x86)/Fiddler Everywhere"; do | ||
| if [ -f "$dir/Fiddler Everywhere.exe" ]; then | ||
| FIDDLER_EXE="$dir/Fiddler Everywhere.exe" | ||
| break | ||
| fi | ||
| done | ||
| if [ -n "$FIDDLER_EXE" ]; then | ||
| "$FIDDLER_EXE" & | ||
| sleep 15 | ||
| fi | ||
| ``` | ||
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| --- | ||
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| ## Phase 5 — Suggest MCP setup | ||
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| After Fiddler Everywhere is installed and launched, inform the user that there is | ||
| an automatic MCP setup skill that can configure the Fiddler MCP server connection. | ||
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| Present the following message: | ||
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| > Fiddler Everywhere is installed and running. | ||
| > | ||
| > There is an **automatic MCP setup** skill that can configure the Fiddler MCP | ||
| > server connection for your AI agent. This will allow agent tools | ||
| > to interact with Fiddler directly — capturing traffic, | ||
| > inspecting sessions, creating rules, and more — all from within your editor. | ||
| > | ||
| > Would you like me to auto-configure MCP now? | ||
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| Ask the user to choose: | ||
| - **Yes, auto-configure MCP** (recommended) | ||
| - **No, I'll set it up manually later** | ||
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| ### If the user accepts | ||
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| Install the `fiddler-mcp-setup` skill from its remote location and invoke it: | ||
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| **Remote skill URL:** `https://github.com/telerik/fiddler-agent-tools/tree/master/skills/fiddler-mcp-setup` | ||
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Contributor
There was a problem hiding this comment. Copilot did make a note on "hot linking" to external skills and having a skill install it, but it's incorrect guidance - we don't accept skills that instruct the agent to install other skills as this results in opacity with what's happening. Reviewing https://github.com/telerik/fiddler-agent-tools, it appears that these skills are copied across from there, so I'd suggest that it would be better to have them provided as an external plugin, which means all skills can be shipped together, and there is no need to have one skill trying to install other skills. |
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| Follow the `fiddler-mcp-setup` skill instructions to complete MCP configuration end-to-end. | ||
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| ### If the user declines | ||
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| Acknowledge and let them know they can download the MCP setup skill later at any time. | ||
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| ## Troubleshooting | ||
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| | Issue | Solution | | ||
| |-------|----------| | ||
| | macOS password dialog canceled / install aborted | Rerun the `osascript` command — the pkg in `/tmp` is still there | | ||
| | `hdiutil: attach failed` | File may not be fully downloaded — rerun the `curl` command | | ||
| | Windows EXE blocked by SmartScreen | Right-click → Run as Administrator | | ||
| | App won't open on macOS | Run `xattr -cr "/Applications/Fiddler Everywhere.app"` to clear quarantine | | ||
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