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.
npx skills add vinzscam/backstage-skills --skill using-backstage-uigit clone --depth 1 https://github.com/vinzscam/backstage-skillsWrote 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.
[](https://agentmods.dev/skills/vinzscam/backstage-skills/using-backstage-ui)<a href="https://agentmods.dev/skills/vinzscam/backstage-skills/using-backstage-ui"><img src="https://agentmods.dev/badge/skills/vinzscam/backstage-skills/using-backstage-ui.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00073 | $0.01083 |
| Opus 5 | $0.00036 | $0.00541 |
| Sonnet 5 | $0.00015 | $0.00217 |
| Haiku 4.5 | $0.00007 | $0.00108 |
Grade A, and why
using-backstage-ui 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 8d 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.
How it starts
The opening of the file, as written. The whole thing — 85 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Backstage UI (BUI) Patterns
When to use this skill
- Authoring or editing any frontend component in a Backstage plugin
- Picking the right component for layout, typography, form input, dialog, menu, tab, table, etc.
- Styling components (BUI uses CSS modules + design tokens, not
makeStyles) - Adding icons (use
@remixicon/react)
Setup
A new plugin scaffolded with yarn new includes @backstage/ui automatically. If installing manually:
yarn add @backstage/ui @remixicon/react
Then add the stylesheet to your app entry (packages/app/src/index.tsx or similar):
import '@backstage/ui/css/styles.css';
Choose the right component
| Need | Component | Reference |
|---|---|---|
| Page layout / wrappers | Box, Container, Flex, FullPage, Grid |
references/components.md |
| Typography | Text |
references/components.md |
| Buttons / actions | Button, ButtonIcon, ButtonLink |
references/components.md |
| Forms | TextField, PasswordField, SearchField, Select, Combobox, Checkbox, RadioGroup, Switch, DatePicker, DateRangePicker |
references/components.md |
| Feedback | Alert, Skeleton, Tooltip, Tag, TagGroup |
references/components.md |
| Overlays | Dialog, Menu, Popover |
references/components.md |
| Navigation | Tabs, Header, PluginHeader, Link |
references/components.md |
| Data | Table (+ useTable hook), List (+ ListRow), Avatar, Card |
references/components.md |
| Icons | @remixicon/react (e.g. RiSearchLine, RiAddLine) |
references/icons.md |
| Styling | CSS modules with BUI tokens (--bui-space-*, --bui-fg-*, --bui-bg-*) |
references/styling.md |
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.
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.
- 8d ago First seen · 85 lines · 73 tokens per session scan A 16001bc7dcd1
using-backstage-ui is a skill published in the GitHub repository vinzscam/backstage-skills (4 stars, last pushed 13d ago), licensed Apache-2.0. It adds 73 tokens to every session and 1,083 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.
Other skills, from other repositories
systematic-debugging
Use when encountering any bug, test failure, or unexpected behavior, before proposing fixes.
local-ai-agents
Build local-first AI agents that run entirely on a developer workstation with Microsoft Foundry Local and Qwen function-calling models. Covers Small Language Models (SLMs), the OpenAI-compatible local endpoint, sandboxed local tools, local RAG with Chroma, local MCP servers, hybrid cloud/local routing, and the…
next-cache-components-adoption
Turn on Cache Components in a Next.js app and resolve the blocking routes it surfaces. Use when the user wants to enable, adopt, or migrate to Cache Components, flip the cacheComponents flag, work through a flood of blocking-prerender / instant validation errors, run the cache-components-instant-false codemod, or…
next-cache-components-optimizer
Drive a Next.js route to instant navigation by setting up an agentic loop, under Cache Components / PPR, on initial load (hard navigation) and client-side navigation (soft navigation). Encode the goal as a failing @next/playwright instant() e2e and work it to green, one verified route at a time; the shipped test then…
next-partial-prefetching-adoption
Turn on Partial Prefetching in a Next.js app and work through the insights it surfaces. Use when the user wants to enable or adopt Partial Prefetching, flip the partialPrefetching flag, opt routes in with export const prefetch = 'partial', audit Link prefetch={true} behavior, preserve existing prefetched UI with…
chronicle
Analyze Copilot session history for standup reports, usage tips, session search, and session reindexing. Use when the user asks for a standup, daily summary, usage tips, workflow recommendations, wants to search or find past sessions by keyword/file/PR, wants to reindex their session store, or asks about deleting…