What is nubecita-design?

A design guide for creating Nubecita interfaces and visual assets, including production screens, prototypes, and mockups. Nubecita is an Android Bluesky client with its own colors, fonts, components, and responsive layout rules.

Use it when designing or implementing Nubecita screens, prototypes, mockups, or branded visual assets.

It keeps new screens consistent with the product's visual language instead of requiring design decisions from scratch. It also points to the approved assets, style tokens, and reusable interface components.

nubecita-design — Skill for Claude Code by kikin81

Install

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.

Any agent

npx skills add kikin81/nubecita --skill design-system

Clone the repo

git clone --depth 1 https://github.com/kikin81/nubecita

Made for: Claude Code.

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/kikin81/nubecita/design-system/github.svg)](https://agentmods.dev/skills/kikin81/nubecita/design-system)

Your own site

<a href="https://agentmods.dev/skills/kikin81/nubecita/design-system"><img src="https://agentmods.dev/badge/skills/kikin81/nubecita/design-system/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/kikin81/nubecita/design-system"><img src="https://agentmods.dev/badge/skills/kikin81/nubecita/design-system.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 74 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 414 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	$0.00074	$0.00414
Opus 5	$0.00037	$0.00207
Sonnet 5	$0.00015	$0.00083
Haiku 4.5	$0.00007	$0.00041

Measured 12d ago against content hash 45cf40c4229a, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

nubecita-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 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.

openspec/references/design-system/SKILL.md · 23 lines

What it actually says

Read the README.md file within this skill, and explore the other available files.

If creating visual artifacts (slides, mocks, throwaway prototypes, etc), copy assets out and create static HTML files for the user to view. Always reference colors_and_type.css for tokens, pull SVG marks from assets/, and use the JSX primitives in ui_kits/nubecita-android/ as the starting point for any Nubecita screen.

If working on production code, you can copy assets and read the rules here to become an expert in designing with this brand.

If the user invokes this skill without any other guidance, ask them what they want to build or design, ask some questions, and act as an expert designer who outputs HTML artifacts — or production code — depending on the need.

Key things to remember when designing for Nubecita:

Primary color is Sky #0A7AFF (tone 50). Secondary is Peach, tertiary is Lilac.
Buttons are fully pill-shaped (M3 Expressive tell).
Feed body type is 17 / 26 px (one step larger than M3 default) because readability is the top priority.
Display type is Fraunces with SOFT 50–80 variation; body is Roboto Flex.
Motion uses spring easing — default is a quick overshoot, emphasized is a larger slower overshoot.
Iconography is Material Symbols Rounded — filled variant for active state.
Voice: warm, direct, second-person, sentence case, no emoji in chrome.

Files

What ships with it

60 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.

12d ago First seen · 23 lines · 74 tokens per session scan A 45cf40c4229a

Subscribe to this mod's changes

nubecita-design is a skill published in the GitHub repository kikin81/nubecita (5 stars, last pushed today), licensed MIT. It adds 74 tokens to every session and 414 once invoked, about $0.0004 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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nubecita-design