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.
git clone --depth 1 https://github.com/bitsmuggler/c4-skillWrote 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.
[](https://agentmods.dev/plugins/bitsmuggler/c4-skill/c4-skill)<a href="https://agentmods.dev/plugins/bitsmuggler/c4-skill/c4-skill"><img src="https://agentmods.dev/badge/plugins/bitsmuggler/c4-skill/c4-skill/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.
<a href="https://agentmods.dev/plugins/bitsmuggler/c4-skill/c4-skill"><img src="https://agentmods.dev/badge/plugins/bitsmuggler/c4-skill/c4-skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>Grade A, and why
c4-skill scanned grade A with 0 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 1mo 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
What it installs
The manifest is a name and a version. 1 skill, 1 command travel with it, and installing the plugin installs all of them — 103 tokens a session between them. Each is measured on its own page, and each can be installed alone.
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.
- 1mo ago First seen · 9 lines scan A 895a9aceb14e
c4-skill is a plugin published in the GitHub repository bitsmuggler/c4-skill (61 stars, last pushed 8mo ago), with no licence file. Its token cost is not measured: this kind of file is read by the harness, not the model. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other plugins, from other repositories
nwave-marketplace
Plugin marketplace listing 1 plugin: nw.
nw
nWave: AI-powered workflow framework — 23 agents, 98+ skills, TDD enforcement, and wave-based development methodology for Claude Code.
mneme
Enforce architectural decisions and engineering standards before Claude Code writes changes.
enterprise-architecture
Unified enterprise & software architecture skill: C4 + Structurizr DSL, ArchiMate 3.x, TOGAF ADM, and arc42 + ADRs. Four modes — diagram (diagrams-as-code), document (arc42 + ADRs), review (ISO/IEC 25010 assessment), and model the enterprise (capability → application → technology).
sdd
Spec-Driven Development workflow: /sdd: commands, portable skill, machine-checked gate. Bilingual EN/ES. No code before approved spec and consistent plan.
draw-c4
Generate or update an interactive, self-contained C4-style architecture diagram (single HTML file) from a codebase.