What is mobile-first-ui-ux?

A set of mobile-first interface rules for an app that should work on small screens and during flight mode. It relies on local caches and relays so some app data remains available without a network connection.

Use it when designing screens, loading states, offline behaviour, and error messages for smartphones, including older devices.

It focuses development on usable phone layouts and offline behaviour instead of treating mobile as a later adaptation.

mobile-first-ui-ux — Cursor rule for Cursor by nostr-reader/boris

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.

Clone the repo

git clone --depth 1 https://github.com/nostr-reader/boris

Made for: Cursor.

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/rules/nostr-reader/boris/mobile-first-ui-ux/github.svg)](https://agentmods.dev/rules/nostr-reader/boris/mobile-first-ui-ux)

Your own site

<a href="https://agentmods.dev/rules/nostr-reader/boris/mobile-first-ui-ux"><img src="https://agentmods.dev/badge/rules/nostr-reader/boris/mobile-first-ui-ux/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/rules/nostr-reader/boris/mobile-first-ui-ux"><img src="https://agentmods.dev/badge/rules/nostr-reader/boris/mobile-first-ui-ux.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 6 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 110 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 100% copy Near-identical to another mod 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	$0.00006	$0.00110
Opus 5.5	$0.00002	$0.00044
Sonnet 5.5	$0.00001	$0.00022
Haiku 4.5	$0.00001	$0.00011

Measured 4d ago against content hash 298a7508efbf, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mobile-first-ui-ux 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 4d 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.

Origin

This is a copy

100% identical to mobile-first-ui-ux — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.cursor/rules/mobile-first-ui-ux.mdc · 11 lines

What it actually says

Mobile-First UI/UX

This is a mobile-first application. All UI elements should be designed with that in mind. The application should work well on small screens, including older smartphones. The UX should be immaculate on mobile, even when in flight mode. (We use local caches and local relays, so that app works offline too.)

Let's not show too many error messages, and more importantly: let's not make them red. Nothing is ever this tragic.

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.

4d ago First seen · 11 lines · 6 tokens per session scan A 298a7508efbf

Subscribe to this mod's changes

mobile-first-ui-ux is a cursor rule published in the GitHub repository nostr-reader/boris (19 stars, last pushed 7d ago), licensed MIT. It adds 6 tokens to every session and 110 once invoked, about $0.0000 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to mobile-first-ui-ux, differing in 0 lines, and is treated as a copy.

Design and UX Mobile local-first nostr offline read-it-later reader

mobile-first-ui-ux next to 6 cursor rules from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
mobile-first-ui-uxnostr-reader/boris	Cursor rule	19	7d ago	MIT	A	6	Cursor
fontawesomedergigi/boris	Cursor rule	19	1mo ago	MIT	A	13	Cursor
mobile-first-ui-uxdergigi/boris	Cursor rule	19	1mo ago	MIT	A	6	Cursor
fetching-data-with-controllersdergigi/boris	Cursor rule	19	1mo ago	MIT	A	6	Cursor
zaps-and-zap-splitsdergigi/boris	Cursor rule	19	1mo ago	MIT	A	8	Cursor
bookmarksdergigi/boris	Cursor rule	19	1mo ago	MIT	A	27	Cursor
nostr-native-blog-post-aka-long-form-kinddergigi/boris	Cursor rule	19	1mo ago	MIT	A	22	Cursor