What is ragtime frontend.instructions.md?

A set of frontend instructions for building a user interface with reusable design tokens, such as named colors, spacing, fonts, corner shapes, and shadows. It also defines light and dark modes and optional visual theme packs.

Use it when developing frontend components, applying themes, storing theme choices, and ensuring styles follow the project's design system.

It keeps the interface consistent and lets themes change across the application without editing each component separately.

How mattv8/ragtime configures GitHub Copilot

Reuse

Borrowing it

Nothing to install: this file belongs to mattv8/ragtime. 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/mattv8/ragtime/beta/.github/instructions/frontend.instructions.md

Clone the repo

git clone --depth 1 https://github.com/mattv8/ragtime

Made for: GitHub Copilot.

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/instructions/mattv8/ragtime/frontend/github.svg)](https://agentmods.dev/instructions/mattv8/ragtime/frontend)

Your own site

<a href="https://agentmods.dev/instructions/mattv8/ragtime/frontend"><img src="https://agentmods.dev/badge/instructions/mattv8/ragtime/frontend/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/instructions/mattv8/ragtime/frontend"><img src="https://agentmods.dev/badge/instructions/mattv8/ragtime/frontend.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 2,790 This file is loaded in full into every session.

When invoked 2,790 The same file — it is already loaded in full.

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	$0.02790	$0.02790
Opus 5.5	$0.01116	$0.01116
Sonnet 5.5	$0.00558	$0.00558
Haiku 4.5	$0.00279	$0.00279

Measured 1mo ago against content hash 496622347ebb, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ragtime frontend.instructions.md 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.

.github/instructions/frontend.instructions.md · 130 lines

How it starts

The opening of the file, as written. The whole thing — 130 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Ragtime Frontend - Design System

Ragtime's UI is token-driven. Every color, radius, shadow, spacing value, and font is a CSS custom property defined in src/styles/theme.css (the base contract) and optionally overridden per theme pack under src/styles/themes/.

Component CSS must never hard-code themeable values. It should read tokens so a theme applies app-wide without per-component rules.

There are two orthogonal axes, both set as attributes on <html>:

Axis	Attribute	Values	Storage key	Default
Theme pack	`data-theme-pack`	`default` (attribute absent), `modern`, `serif`	`ragtime-theme-pack`	`default`
Color mode	`data-theme`	`light`, `dark`, system (attribute absent)	`ragtime-theme`	system

They compose: for example, data-theme-pack="serif" + data-theme="light" produces the serif pack's parchment light palette. Both are applied before first paint by the inline guard in index.html to avoid a flash of the wrong theme, and at runtime via src/theme (setThemePack, setColorMode).

Persistence & Precedence

Theme pack resolution is user saved choice -> global default -> default; resolveThemePackId(...) is the source of truth.
The theme registry (THEME_PACKS) is canonical for available packs, user-menu cycling order, and Settings cards. There are currently default, modern, and serif.
localStorage is advisory only: getStoredThemePack() and getStoredColorMode() are guarded and fall back to defaults if storage is unavailable or invalid.
setThemePack() and setColorMode() remove the corresponding HTML attribute and clear the storage key when switching back to default or system.
User-menu theme changes are applied immediately in the UI and then saved best-effort to the account; the optimistic local theme stays in place even if the network save fails.
The global default theme is changed in Settings and is intended for admins; a per-user choice always overrides it.

Read the full file on GitHub · 130 lines

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.

1mo ago Changed · +18 lines · +598 tokens per session 496622347ebb
2mo ago Changed · +1 lines · +65 tokens per session c1281a86411f
2mo ago First seen · 111 lines · 2,127 tokens per session scan A 96110f04fc11

Subscribe to this mod's changes

ragtime frontend.instructions.md is an instructions file published in the GitHub repository mattv8/ragtime (33 stars, last pushed today), licensed MIT. It adds 2,790 tokens to every session, about $0.0112 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 2026-08-30.

CSS and styling Design and UX Frontend

ragtime frontend.instructions.md next to 6 instructions from other repositories
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ragtime: Instructions file for GitHub Copilot