A design specification for interactive command-line screens, also called terminal user interfaces. It describes page layout, colors, keyboard movement, and navigation levels.

Use it when creating or changing CLI pages, interactive controls, navigation, or visual themes in a terminal application.

It gives developers consistent rules for building terminal screens that are organized and navigable from the keyboard.

How castle-x/skills-x configures Codex

Reuse

Borrowing it

Nothing to install: this file belongs to castle-x/skills-x. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/castle-x/skills-x/main/.codex/skills/tui-design/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/castle-x/skills-x

Made for: Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/castle-x/skills-x/tui-design/github.svg)](https://agentmods.dev/skills/castle-x/skills-x/tui-design)

Your own site

<a href="https://agentmods.dev/skills/castle-x/skills-x/tui-design"><img src="https://agentmods.dev/badge/skills/castle-x/skills-x/tui-design/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/castle-x/skills-x/tui-design"><img src="https://agentmods.dev/badge/skills/castle-x/skills-x/tui-design.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 44 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 4,348 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00044	$0.04348
Opus 5	$0.00022	$0.02174
Sonnet 5	$0.00009	$0.00870
Haiku 4.5	$0.00004	$0.00435

Measured 10d ago against content hash 1be19af9fe7a, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

tui-design 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 10d 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.

.codex/skills/tui-design/SKILL.md · 525 lines

How it starts

The opening of the file, as written. The whole thing — 525 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLI TUI Design Specification

This document provides comprehensive design guidelines for implementing interactive terminal user interface (TUI) applications.

When to Use This Skill

Developing or modifying CLI TUI components
Adding new UI pages or interactions
Implementing new visual styles or themes
Creating similar TUI applications following this pattern

1. Page Layout Structure

Every TUI page follows a consistent four-section layout:

┌────────────────────────────────────────────────────────────────┐
│  Header: Title Line + Separator + ASCII Logo + Separator       │
├────────────────────────────────────────────────────────────────┤
│  Info Bar: Context-dependent information (Dynamic)             │
├────────────────────────────────────────────────────────────────┤
│  Content Area: Interactive options/list (Scrollable)           │
│                                                                │
├────────────────────────────────────────────────────────────────┤
│  Footer: Status Bar + Separator + Keyboard Hints               │
└────────────────────────────────────────────────────────────────┘

Section Details

1.1 Header Section (Always Visible)

The header consists of a title line, separator, ASCII logo, and separator with symmetric spacing:

🚀 Skills-X - AI Agent Skills Manager  v0.2.12
────────────────────────────────────────────────────────────
                                                  <- 1 blank line (from logo constant leading \n)
   ███████╗██╗  ██╗██╗██╗     ...
   ╚══════╝╚═╝  ╚═╝╚═╝╚══════╝...
                                                  <- 1 blank line (from logo constant trailing \n + 1 extra \n)
────────────────────────────────────────────────────────────

Spacing rules:

The logo constant uses backtick string, which naturally includes a leading \n (after opening backtick) and trailing \n (before closing backtick)
After logoStyle.Render(logo), add exactly one \n — this produces symmetric 1-blank-line padding on both sides
Never add \n\n after logo — it creates asymmetric bottom padding

Read the full file on GitHub · 525 lines

Files

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.

Changes

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.

10d ago First seen · 525 lines · 44 tokens per session scan A 1be19af9fe7a

Subscribe to this mod's changes

tui-design is a skill published in the GitHub repository castle-x/skills-x (18 stars, last pushed 4mo ago), licensed MIT. It adds 44 tokens to every session and 4,348 once invoked, about $0.0002 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.

Design and UX

webgl-holographic-foil

A self-contained WebGL2 hero: thin-film interference over a crushed-foil surface whose palette shifts with the viewing angle; move the cursor to tilt the film.

nexu-io/open-design · 41 tokens

html-ppt-hermes-cyber-terminal

OpenDesign + BYOK: choosing and wiring your own model, hands-on — cost, quality, and the routing decision. Built as a decision-grade AI literacy deck for engineers, IT, applied-AI teams.

nexu-io/open-design · 53 tokens

html-ppt-taste-brutalist

16:9 HTML deck in tactical-telemetry / CRT-terminal taste. Deactivated-CRT charcoal slides, white-phosphor monospace, hazard-red accent, scanline overlay, ASCII syntax, density over decoration. Distilled from Leonxlnx/taste-skill brutalist-skill (Tactical Telemetry mode).

nexu-io/open-design · 78 tokens

skills-x: Skill for Codex