mobile-first

mobile-first is a skill for Claude Code, Codex from PIXARTSeu/Synapse. It costs 42 tokens per session (4,740 once invoked), scanned A, original, no licence file.

A guide to designing and evaluating interfaces for phones before adapting them to larger screens. It covers thumb reach, touch-target size, responsive layouts, and Core Web Vitals, which are measures of loading and interaction quality.

In plain words
What is it for?
Use it to optimize mobile interfaces, improve touch interactions, build responsive layouts, and audit mobile performance.
Why use it?
It helps prevent interfaces that are difficult to tap, navigate, or use on small screens. It also addresses mobile performance and layout behavior across screen sizes.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/pixartseu/synapse/mobile-first
Any agent
npx skills add PIXARTSeu/Synapse --skill mobile-first
Clone the repo
git clone --depth 1 https://github.com/PIXARTSeu/Synapse

Made for: Claude Code, 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.

agentmods badge for mobile-first

README.md
[![agentmods](https://agentmods.dev/badge/skills/pixartseu/synapse/mobile-first.svg)](https://agentmods.dev/skills/pixartseu/synapse/mobile-first)
Your own site
<a href="https://agentmods.dev/skills/pixartseu/synapse/mobile-first"><img src="https://agentmods.dev/badge/skills/pixartseu/synapse/mobile-first.svg" alt="Measured on agentmods" height="20"></a>
Per session 42 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,740 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown 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.

ModelPer sessionOnce invoked
Fable 5 $0.00042 $0.04740
Opus 5 $0.00021 $0.02370
Sonnet 5 $0.00008 $0.00948
Haiku 4.5 $0.00004 $0.00474

Measured yesterday against content hash adc1014f5d7f, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

mobile-first 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 yesterday.

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.

packages/codegraph/data/skill/mobile-first/SKILL.md · 806 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Files

What ships with it

3 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.

  1. yesterday First seen · 806 lines · 42 tokens per session scan A adc1014f5d7f

Subscribe to this mod's changes

mobile-first is a skill published in the GitHub repository PIXARTSeu/Synapse (8 stars, last pushed 9d ago), with no licence file. It adds 42 tokens to every session and 4,740 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 2026-09-03.

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