Companion is a self-hosted, multi-tenant hub for managing personal and organizational SKILL.md libraries used by coding agents. It is for organizations that need to store, validate, version, share, install, update, and synchronize agent skills, with optional named companions that have persistent workspaces and chats. The catalogue skills, agents, and instructions are resources managed or used within this workflow.
Borrowing it
Nothing to install: this file belongs to The-Vibe-Company/companion. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/The-Vibe-Company/companion/main/.agents/skills/design-frontend-dev/SKILL.mdgit clone --depth 1 https://github.com/The-Vibe-Company/companionWrote 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/the-vibe-company/companion/design-frontend-dev)<a href="https://agentmods.dev/skills/the-vibe-company/companion/design-frontend-dev"><img src="https://agentmods.dev/badge/skills/the-vibe-company/companion/design-frontend-dev/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.
<a href="https://agentmods.dev/skills/the-vibe-company/companion/design-frontend-dev"><img src="https://agentmods.dev/badge/skills/the-vibe-company/companion/design-frontend-dev.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00127 | $0.01684 |
| Opus 5 | $0.00063 | $0.00842 |
| Sonnet 5 | $0.00025 | $0.00337 |
| Haiku 4.5 | $0.00013 | $0.00168 |
Grade A, and why
design-frontend-dev 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 9d 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 — 144 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Impeccable
Designs and reviews production-grade frontend interfaces with strong UX, visual hierarchy, accessibility, responsive behavior, and anti-slop discipline.
This is the clean Companion edition derived from pbakaus/impeccable under Apache-2.0. It keeps the design reasoning and review logic, but intentionally excludes the upstream CLI, hooks, live browser mode, install flow, site, extension, marketing material, and bundled scripts.
Protected Invariants
- Agent-only skill: do not require
npx, bundled scripts, hooks, live mode, browser injection, extension APIs, or a product website. - No commercial calls to action, install prompts, update checks, telemetry, or external service dependency.
- Keep
SKILL.mdcompact and load detailed reference files only when relevant. - Respect the host agent's higher-priority rules. When used from another review skill, that owner skill's safety rules win.
- For code-review use, stay read-only unless the user explicitly asked for implementation.
Setup
Before design or review work:
- Gather project context from existing files when present:
PRODUCT.md,DESIGN.md,README, design-system docs, tokens, CSS/theme files, component libraries, and representative pages/components. - Classify the surface:
brand: marketing, landing, campaign, portfolio, long-form content, or any surface where design is the product. Readreference/brand.md.product: app UI, admin, dashboard, settings, tools, authenticated surfaces, or any surface where design serves the task. Readreference/product.md.
- Read at least one concrete implementation file before making design claims. Prefer tokens, CSS, theme config, a shared component, and the changed or requested surface.
- Pick only the reference files needed for the task.
If PRODUCT.md is missing, do not stop. Infer from available context, state the assumption, and continue. If DESIGN.md is missing, use visible conventions in code as the design source of truth.
What ships with it
25 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.
- companion.json 2.6 KB
- evals/evals.json 1.0 KB
- LICENSE 11 KB
- reference/adapt.md 9.9 KB
- reference/animate.md 10 KB
- reference/audit.md 6.4 KB
- reference/bolder.md 6.3 KB
- reference/brand.md 12 KB
- reference/clarify.md 10 KB
- reference/colorize.md 12 KB
- reference/critique.md 2.5 KB
- reference/delight.md 9.5 KB
- reference/distill.md 5.5 KB
- reference/harden.md 8.4 KB
- reference/interaction-design.md 6.4 KB
- reference/layout.md 8.5 KB
- reference/onboard.md 7.6 KB
- reference/optimize.md 7.4 KB
- reference/overdrive.md 8.8 KB
- reference/polish.md 12 KB
- reference/product.md 4.7 KB
- reference/quieter.md 4.7 KB
- reference/shape.md 11 KB
- reference/typeset.md 14 KB
- SOURCE.md 734 B
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.
- 9d ago First seen · 144 lines · 127 tokens per session scan A 7e0b3eb30ca5
design-frontend-dev is a skill published in the GitHub repository The-Vibe-Company/companion (2,401 stars, last pushed 3d ago), licensed MIT. It adds 127 tokens to every session and 1,684 once invoked, about $0.0006 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 2026-09-02.
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