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 vvedantb/eva --skill libraries-devgit clone --depth 1 https://github.com/vvedantb/evaWrote 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/vvedantb/eva/libraries-dev)<a href="https://agentmods.dev/skills/vvedantb/eva/libraries-dev"><img src="https://agentmods.dev/badge/skills/vvedantb/eva/libraries-dev/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/vvedantb/eva/libraries-dev"><img src="https://agentmods.dev/badge/skills/vvedantb/eva/libraries-dev.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 | $0.00171 | $0.02482 |
| Opus 5.5 | $0.00068 | $0.00993 |
| Sonnet 5.5 | $0.00034 | $0.00496 |
| Haiku 4.5 | $0.00017 | $0.00248 |
Grade A, and why
libraries-dev 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 11d 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 — 178 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Libraries.dev
Seven UI effect libraries for AI-era interfaces, each an npm package with a React component. This skill knows what each one is for, how to install it, and the options its libraries.dev detail page offers. Read the library's reference file before writing any code for it; never guess a prop.
Quick reference
| Library | Package | Component | Use it for | Reference |
|---|---|---|---|---|
| Border beam | border-beam |
BorderBeam |
A light that travels around an element's border: AI inputs, active cards, highlighted buttons. | 01-border-beam.md |
| Thinking orbs | thinking-orbs |
ThinkingOrb |
Small dot-orb indicators for what an agent is doing: thinking, searching, writing, listening. | 02-thinking-orbs.md |
| Gooey | liquid-gooey |
Liquid |
Liquid, melting and merging shapes and images: gooey menus, blob transitions, organic backdrops. | 03-liquid-gooey.md |
| Voice | voice-glow |
VoiceBeam |
An audio-reactive glow for voice input, dictation and voice agents. | 04-voice-glow.md |
| Bot avatars | bot-avatars |
BotAvatar |
Animated bot characters with idle and working states for agents and assistants. | 05-bot-avatars.md |
| Liquid metal | metal-fx |
MetalFx |
A real-time liquid metal material for buttons, badges, icons and text. | 06-metal-fx.md |
| Image | img-fx |
ImageGeneration |
Image generation placeholders and reveals while an image is being made or loaded. | 07-img-fx.md |
Docs and live playgrounds: https://libraries.dev (one detail page per library).
Decision rules
The author's placement rules. Apply them first; the general cues follow.
By how long the wait is (estimate it from the code: streaming model replies, agent runs, image generation and uploads are long; small fetches, toggles and route changes are short; if you cannot tell, say so):
What ships with it
7 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.
- 11d ago First seen · 178 lines · 171 tokens per session scan A 7ba03e3884bd
libraries-dev is a skill published in the GitHub repository vvedantb/eva (101 stars, last pushed today), licensed MIT. It adds 171 tokens to every session and 2,482 once invoked, about $0.0007 per session on Opus 5.5. 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 2026-10-07.
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