cynthion-pcap-decode

cynthion-pcap-decode is a skill for Claude Code, Codex from curtisgalloway/public-skills. It costs 88 tokens per session (2,720 once invoked), scanned B, original, no licence file.

A tool for reading and comparing USB traffic capture files (.pcap and .pcapng) made with Packetry or Cynthion. It helps interpret USB endpoints, descriptors, and transfer sequences.

In plain words
What is it for?
Use it to decode, analyze, summarize, or compare USB captures and investigate specific endpoints, descriptors, or transfer sequences.
Why use it?
It removes the need to inspect raw USB capture data manually or rely on guesswork when comparing captures.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

Part of the hardware-lab plugin — 8 skills shipped together

Good fit Use it to decode, analyze, summarize, or compare USB captures and investigate specific endpoints, descriptors, or transfer sequences.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/curtisgalloway/public-skills/cynthion-pcap-decode
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.

Any agent
npx skills add curtisgalloway/public-skills --skill cynthion-pcap-decode
Clone the repo
git clone --depth 1 https://github.com/curtisgalloway/public-skills

Made for: Claude Code, Codex.

Or install hardware-lab, the plugin that ships this one along with the rest of its 8 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for cynthion-pcap-decode

README.md
[![agentmods](https://agentmods.dev/badge/skills/curtisgalloway/public-skills/cynthion-pcap-decode/github.svg)](https://agentmods.dev/skills/curtisgalloway/public-skills/cynthion-pcap-decode)
Your own site
<a href="https://agentmods.dev/skills/curtisgalloway/public-skills/cynthion-pcap-decode"><img src="https://agentmods.dev/badge/skills/curtisgalloway/public-skills/cynthion-pcap-decode/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for cynthion-pcap-decode

Your own site · 80×15
<a href="https://agentmods.dev/skills/curtisgalloway/public-skills/cynthion-pcap-decode"><img src="https://agentmods.dev/badge/skills/curtisgalloway/public-skills/cynthion-pcap-decode.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 88 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,720 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 2 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00088 $0.02720
Opus 5 $0.00044 $0.01360
Sonnet 5 $0.00018 $0.00544
Haiku 4.5 $0.00009 $0.00272

Measured 8d ago against content hash 3f30cff58272, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade B, and why

cynthion-pcap-decode scanned grade B with 2 findings 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 8d ago.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/decode.py, scripts/diff.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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 apt install tshark # Debian/Ubuntu

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -L https://raw.githubusercontent.com/greatscottgadgets/packetry/main/tests/mouse/capture.pcap \
plugins/hardware-lab/skills/cynthion-pcap-decode/SKILL.md · 287 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

  1. 8d ago Changed 3f30cff58272
  2. 11d ago First seen · 287 lines · 88 tokens per session scan B 2c29ba937941

Subscribe to this mod's changes

cynthion-pcap-decode is a skill published in the GitHub repository curtisgalloway/public-skills (2 stars, last pushed today), with no licence file. It adds 88 tokens to every session and 2,720 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it B with 2 findings (asks for root, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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