How do I install the Xfr skill?

Run npx skillmds@latest add javimosch/xfr in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

What does the Xfr skill do?

Use this skill when the user wants to test network bandwidth, benchmark connections, compare network performance results, or measure throughput with a live TUI. It is listed under Coding & Dev Tools on SkillMD.

SkillMD's automated safety review verdict for this skill is PASS. Independent scanners report: SkillSpector: PASS, Skill Scanner: PASS. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Xfr?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

javimosch (@javimosch) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Xfr by javimosch — Agent Skill

Name: Xfr
Author: javimosch

File contents

Xfr Plugin

A modern iperf3 alternative with a live TUI, multi-client server, and QUIC support. Built in Rust.

Commands

Server

xfr serve start — Start xfr server for bandwidth testing

Client Testing

xfr client test — Run bandwidth test to xfr server

Result Comparison

xfr diff compare — Compare two bandwidth test results

LAN Discovery

xfr discover find — Find xfr servers on LAN via mDNS

Usage Examples

Start server:

xfr serve
xfr serve -p 9000
xfr serve --tui
xfr serve --prometheus 9090

Run bandwidth test:

xfr 192.168.1.1
xfr 192.168.1.1 -t 30s -b 100M
xfr 192.168.1.1 -P 4 -R
xfr 192.168.1.1 -u -b 1G
xfr 192.168.1.1 --quic -P 4

Output formats:

xfr 192.168.1.1 --json -o results.json
xfr 192.168.1.1 --csv -o results.csv

Compare results:

xfr diff baseline.json current.json
xfr diff before.json after.json --threshold 5

Discover servers:

xfr discover

Installation

cargo install xfr

Or via package manager:

brew install lance0/tap/xfr
eget lance0/xfr

Key Features

Live TUI with real-time throughput graphs
Multi-client server (vs iperf3 single client)
TCP, UDP, QUIC, and MPTCP support
Parallel streams for bonded connections
Multiple output formats (text, JSON, CSV)
Result comparison with xfr diff
LAN discovery via mDNS
Prometheus metrics export
11 built-in color themes
Firewall-friendly single-port mode

Frequently asked questions

Xfr