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 owenmorgan/claude-skills --skill png2icogit clone --depth 1 https://github.com/owenmorgan/claude-skillsWrote 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/owenmorgan/claude-skills/png2ico)<a href="https://agentmods.dev/skills/owenmorgan/claude-skills/png2ico"><img src="https://agentmods.dev/badge/skills/owenmorgan/claude-skills/png2ico/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/owenmorgan/claude-skills/png2ico"><img src="https://agentmods.dev/badge/skills/owenmorgan/claude-skills/png2ico.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00005 | $0.01682 |
| Opus 5 | $0.00003 | $0.00841 |
| Sonnet 5 | $0.00001 | $0.00336 |
| Haiku 4.5 | $0.00001 | $0.00168 |
Grade A, and why
png2ico 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 — 180 lines — stays where its author put it; the contents beside it link to each section on GitHub.
png2ico — Favicon & Icon Set Generator
Generate favicon.ico and a complete icon set from a source PNG. Optimised for Next.js App Router but works for any web project.
Generated files
| File | Size(s) | Purpose |
|---|---|---|
favicon.ico |
16/32/48 | Browser tab icon (multi-size ICO) |
icon.png |
32x32 | Browser fallback icon |
apple-icon.png |
180x180 | iOS home screen |
icon-192x192.png |
192x192 | Android home screen / PWA |
icon-512x512.png |
512x512 | PWA splash / install dialog |
Setup check
Before first use, verify dependencies are installed:
python3 -c "from PIL import Image; print('ok')" && (magick --version || convert --version)
If anything is missing:
pip install Pillow && brew install imagemagick
Script location
The conversion script is at ${CLAUDE_SKILL_DIR}/scripts/png2ico.py.
Workflow
1. Detect project context
Check if the current working directory is a Next.js App Router project:
ls package.json next.config.* app/layout.* 2>/dev/null
If app/layout.tsx (or .jsx, .ts, .js) exists, this is a Next.js App Router project. Set IS_NEXTJS=true for later steps.
2. Find or confirm the source image
- If the user provided an image path, use it directly.
- If no image was provided AND
IS_NEXTJS=true:- Look for an existing logo or icon in the project:
Globfor**/*.png,**/*.svgin common locations (public/,app/,assets/,src/). - Look for the largest square-ish PNG that could be a logo. Exclude screenshots, photos, and tiny images.
- If a candidate is found, confirm with the user: "I found
public/logo.png(512x512) — shall I use this as the source for your icons?" - If no candidate is found, ask the user to provide a source image.
- Look for an existing logo or icon in the project:
- If no image was provided AND
IS_NEXTJS=false, ask the user to provide a source image.
Ideal source: square PNG, 512x512 or larger.
3. Generate the icon set
python3 "${CLAUDE_SKILL_DIR}/scripts/png2ico.py" <input> -o <output-dir>
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 · 180 lines · 0 tokens per session scan A bddfa94bfa7d
png2ico is a skill published in the GitHub repository owenmorgan/claude-skills (2 stars, last pushed 5mo ago), licensed MIT. It adds 5 tokens to every session and 1,682 once invoked, about $0.0000 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 2026-08-31.
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