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.
npx skills add hoangsonww/Claude-Code-Agent-Monitor --skill file-headersgit clone --depth 1 https://github.com/hoangsonww/Claude-Code-Agent-MonitorWrote 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/skills/hoangsonww/claude-code-agent-monitor/file-headers)<a href="https://agentmods.dev/skills/hoangsonww/claude-code-agent-monitor/file-headers"><img src="https://agentmods.dev/badge/skills/hoangsonww/claude-code-agent-monitor/file-headers/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/skills/hoangsonww/claude-code-agent-monitor/file-headers"><img src="https://agentmods.dev/badge/skills/hoangsonww/claude-code-agent-monitor/file-headers.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 5.1 | $0.00101 | $0.01069 |
| Opus 5 | $0.00051 | $0.00535 |
| Sonnet 5 | $0.00020 | $0.00214 |
| Haiku 4.5 | $0.00010 | $0.00107 |
Grade A, and why
file-headers 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 12d 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.
How it starts
The opening of the file, as written. The whole thing — 117 lines — stays where its author put it; the contents beside it link to each section on GitHub.
File Headers — Copyright Comment + File Overview
Every applicable source file in this repository starts with a header comment containing a file overview and the exact author line:
@author Son Nguyen <[email protected]>
The name and email must be exactly as above — no variations, no substitutions, no other names. This applies to every coding agent working in this repo (Claude Code, Codex, or any other tool): when you create a new applicable file, write the header first; when you update an existing applicable file that is missing the header, add it as part of the same change.
Applicable files
| Included | Excluded |
|---|---|
*.js, *.ts, *.tsx, *.cjs, *.mjs |
anything under node_modules/, dist/, build/, data/, .worktrees/ |
*.py, *.sh |
vendored/minified files (*.min.js, wiki/mermaid.min.js) |
*.css |
generated files (wiki/i18n-content.js — carries its own AUTO-GENERATED banner) |
snapshots (__snapshots__/), lockfiles, JSON/YAML/Markdown |
Header formats by file type
JS / TS / TSX — server & scripts style (overview inline in @file):
/**
* @file One-to-few-sentence overview of what this file does and why it
* exists. Mention the key contracts or invariants the file owns.
* @author Son Nguyen <[email protected]>
*/
JS / TS / TSX — client style (@file name + @description overview), used
under client/src/:
/**
* @file ComponentName.tsx
* @description What the component/module renders or provides and how it fits
* into the app.
* @author Son Nguyen <[email protected]>
*/
CSS (same block-comment shape as client/src/index.css):
/**
* @file file.css
* @description What these styles cover.
* @author Son Nguyen <[email protected]>
*/
Shell (# block right after the shebang; existing overview comments count —
just make sure the @author line is in the block):
#!/usr/bin/env bash
# script-name.sh — what the script does, one to few lines.
# @author Son Nguyen <[email protected]>
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.
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.
- 12d ago First seen · 117 lines · 101 tokens per session scan A 03f207b605e4
file-headers is a skill published in the GitHub repository hoangsonww/Claude-Code-Agent-Monitor (989 stars, last pushed 2d ago), licensed MIT. It adds 101 tokens to every session and 1,069 once invoked, about $0.0005 per session on Opus 5. 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.
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