Borrowing it
Nothing to install: this file belongs to tincopper/neeko. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/tincopper/neeko/main/.agents/skills/xterm-js/SKILL.mdgit clone --depth 1 https://github.com/tincopper/neekoWrote 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/tincopper/neeko/xterm-js)<a href="https://agentmods.dev/skills/tincopper/neeko/xterm-js"><img src="https://agentmods.dev/badge/skills/tincopper/neeko/xterm-js/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/tincopper/neeko/xterm-js"><img src="https://agentmods.dev/badge/skills/tincopper/neeko/xterm-js.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 | $0.00127 | $0.04385 |
| Opus 5.5 | $0.00051 | $0.01754 |
| Sonnet 5.5 | $0.00025 | $0.00877 |
| Haiku 4.5 | $0.00013 | $0.00439 |
Grade A, and why
xterm-js 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.
How it starts
The opening of the file, as written. The whole thing — 516 lines — stays where its author put it; the contents beside it link to each section on GitHub.
xterm.js Development Skill
xterm.js (@xterm/xterm) is a full-featured terminal emulator that runs in the browser or
Electron. It is NOT a shell — it must be connected to a backend process (e.g. via node-pty +
WebSocket) to execute commands.
1. Installation
npm install @xterm/xterm
# Required addons (install only what you need):
npm install @xterm/addon-fit @xterm/addon-attach @xterm/addon-web-links \
@xterm/addon-search @xterm/addon-webgl @xterm/addon-clipboard \
@xterm/addon-web-fonts @xterm/addon-unicode11
Always import the CSS:
<link rel="stylesheet" href="node_modules/@xterm/xterm/css/xterm.css" />
Or in JS/TS:
import '@xterm/xterm/css/xterm.css';
2. Basic Setup
import { Terminal } from '@xterm/xterm';
const term = new Terminal({
cols: 80,
rows: 24,
cursorBlink: true,
scrollback: 5000,
fontFamily: '"Cascadia Code", Menlo, monospace',
fontSize: 14,
theme: {
background: '#1e1e1e',
foreground: '#d4d4d4',
cursor: '#d4d4d4',
},
});
term.open(document.getElementById('terminal')!);
term.write('Hello from \x1B[1;32mxterm.js\x1B[0m\r\n$ ');
Critical: Always call term.open(element) AFTER the element is in the DOM.
Use \r\n (not just \n) for newlines when writing directly.
3. Official Addons
| Addon | Package | Purpose |
|---|---|---|
| FitAddon | @xterm/addon-fit |
Resize terminal to fill its container |
| AttachAddon | @xterm/addon-attach |
Connect to a WebSocket backend |
| SearchAddon | @xterm/addon-search |
In-terminal text search |
| WebglAddon | @xterm/addon-webgl |
GPU-accelerated WebGL2 renderer |
| WebLinksAddon | @xterm/addon-web-links |
Clickable URLs |
| ClipboardAddon | @xterm/addon-clipboard |
Browser clipboard integration |
| WebFontsAddon | @xterm/addon-web-fonts |
Wait for web fonts before rendering |
| Unicode11Addon | @xterm/addon-unicode11 |
Unicode 11 character width support |
| LigaturesAddon | @xterm/addon-ligatures |
Font ligature support (canvas renderer only) |
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 · 516 lines · 127 tokens per session scan A 6aa9e631e252
xterm-js is a skill published in the GitHub repository tincopper/neeko (12 stars, last pushed yesterday), licensed Apache-2.0. It adds 127 tokens to every session and 4,385 once invoked, about $0.0005 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 2026-08-31.
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