What is ftr CLAUDE.md?

Repository instructions for ftr, a Rust tool and library that traces the route network packets take to a destination. It sends several network checks at once and can also look up network names, addresses, and segments.

Use it when changing the traceroute command or Rust library, running tests and formatting checks, or preparing cross-platform builds.

Network troubleshooting can be slow and the project has specific Rust version, formatting, testing, and release requirements. These instructions collect the commands and compatibility details contributors need.

ftr CLAUDE.md — Instructions file by dweekly

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add instructions/dweekly/ftr/claude-md

Clone the repo

git clone --depth 1 https://github.com/dweekly/ftr

Per session 1,814 This file is loaded in full into every session.

When invoked 1,814 The same file — it is already loaded in full.

Security scan B 1 finding. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5	$0.01814	$0.01814
Opus 5	$0.00907	$0.00907
Sonnet 5	$0.00363	$0.00363
Haiku 4.5	$0.00181	$0.00181

Measured 2d ago against content hash 55a889acdfec, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade B, and why

ftr CLAUDE.md scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

sudo cargo run -- google.com # Run CLI (requires root on Unix)

CLAUDE.md · 139 lines

How it starts

The opening of the file, as written. The whole thing — 139 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project Overview

ftr (Fast TRaceroute) is a high-performance parallel ICMP traceroute written in Rust. It sends probes concurrently for ~10x speedup over traditional traceroute, with automatic ASN lookup, reverse DNS, public IP detection via STUN, and network segment classification. Available as both a CLI tool and a Rust library. Cross-platform: Linux, macOS, Windows, FreeBSD, OpenBSD.

Version: 0.10.0 (keep in sync with Cargo.toml)
MSRV: 1.85.0 (keep in sync with rust-version in Cargo.toml)
Rust Edition: 2024
License: MIT
Repo: github.com/dweekly/ftr

Build & Test Commands

cargo build                              # Debug build
cargo build --release                    # Release build (LTO, stripped)
cargo test                               # All tests
cargo test --lib                         # Unit tests only
cargo test <test_name>                   # Single test by name
cargo test --test <file>                 # Single integration test file
cargo fmt -- --check                     # Check formatting (CI enforced)
cargo clippy -- -D warnings             # Lint — warnings are errors in CI
cargo audit                              # Security vulnerability check
cargo machete                            # Unused dependency check
cargo doc --no-deps --all-features       # Build docs (RUSTDOCFLAGS=-Dwarnings in CI)
cargo bench                              # Benchmarks (criterion)
sudo cargo run -- google.com             # Run CLI (requires root on Unix)
sudo cargo run -- --json --max-hops 20 google.com  # JSON output

Git Hooks (required)

Install before committing — they enforce fmt and clippy locally:

git config core.hooksPath .githooks

Compliance & Release Scripts

.githooks/check-compliance.sh            # Full local compliance check
.githooks/release-checklist.sh           # Pre-release validation
.githooks/install-tools.sh               # Install dev tools (audit, machete, etc.)

Read the full file on GitHub · 139 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2d ago First seen · 139 lines · 1,814 tokens per session scan B 55a889acdfec

Subscribe to this mod's changes

ftr CLAUDE.md is an instructions file published in the GitHub repository dweekly/ftr (10 stars, last pushed 3d ago), licensed MIT. It adds 1,814 tokens to every session, about $0.0091 per session on Opus 5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

async cli networking traceroute

ftr CLAUDE.md

Getting it into your agent

What it costs to keep this loaded

Grade B, and why

Asks for rootmediumPrivilege escalation

How it starts

CLAUDE.md

Project Overview

Build & Test Commands

Git Hooks (required)

Compliance & Release Scripts

What this file has done since we first saw it

Other instructions, from other repositories

kubefwd CLAUDE.md

MCP-Packet-Tracer AGENTS.md

unifly AGENTS.md

SpotifyScraper CLAUDE.md

pydantic-ai-shields CLAUDE.md

saorsa-core CLAUDE.md