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fast-agent-design

fast-agent-design is a skill for Claude Code from evalstate/fast-agent. It costs 52 tokens per session (182 once invoked), scanned A, original, Apache-2.0.

Design guidance and reusable visual assets for creating interfaces and other visual materials for fast-agent. It supports both production work and temporary prototypes or mock-ups.

In plain words
What is it for?
Use it when designing fast-agent interfaces, slides, mock-ups, static HTML previews, or production code that needs the project's visual rules and assets.
Why use it?
It gives work for the same product a consistent visual direction instead of leaving colours, type, fonts, and components to be chosen separately each time.

Skill for Claude Code

Written for Claude Code: user-invocable in frontmatter.

not rated 3.9krepo +4 3d ago A scan 52 tokens original Apache-2.0

Good fit Use it when designing fast-agent interfaces, slides, mock-ups, static HTML previews, or production code that needs the project's visual rules and assets.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/evalstate/fast-agent/fast-agent-system
View source ↗ evalstate/fast-agent fast-agent.ai
About the project

fast-agent is a command-line framework for creating, running, and evaluating AI agents and workflows, including connections to models, skills, and MCP servers. It is used by developers building coding tools, multimodal agents, automations, and evaluation workflows.

evalstate/fast-agent · 3,929 stars · on GitHub · fast-agent.ai

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.

Any agent
npx skills add evalstate/fast-agent --skill fast-agent-system
Clone the repo
git clone --depth 1 https://github.com/evalstate/fast-agent

Made for: Claude Code.

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 fast-agent-design

README.md
[![agentmods](https://agentmods.dev/badge/skills/evalstate/fast-agent/fast-agent-system/github.svg)](https://agentmods.dev/skills/evalstate/fast-agent/fast-agent-system)
Your own site
<a href="https://agentmods.dev/skills/evalstate/fast-agent/fast-agent-system"><img src="https://agentmods.dev/badge/skills/evalstate/fast-agent/fast-agent-system/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.

agentmods 80×15 button for fast-agent-design

Your own site · 80×15
<a href="https://agentmods.dev/skills/evalstate/fast-agent/fast-agent-system"><img src="https://agentmods.dev/badge/skills/evalstate/fast-agent/fast-agent-system.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 52 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 182 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 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00052 $0.00182
Opus 5.5 $0.00021 $0.00073
Sonnet 5.5 $0.00010 $0.00036
Haiku 4.5 $0.00005 $0.00018

Measured 2d ago against content hash fc76c0f800d8, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

fast-agent-design 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 2d ago.

The scan reads SKILL.md. This mod also ships 6 executable files (_ds_bundle.js, components/actions/Button.d.ts, components/actions/Link.d.ts, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

design/fast-agent-system/SKILL.md · 10 lines

What it actually says

Read the readme.md file within this skill, and explore the other available files. If creating visual artifacts (slides, mocks, throwaway prototypes, etc), copy assets out and create static HTML files for the user to view. If working on production code, you can copy assets and read the rules here to become an expert in designing with this brand. If the user invokes this skill without any other guidance, ask them what they want to build or design, ask some questions, and act as an expert designer who outputs HTML artifacts or production code, depending on the need.

Files

What ships with it

60 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. 2d ago First seen · 10 lines · 52 tokens per session scan A fc76c0f800d8

Subscribe to this mod's changes

fast-agent-design is a skill published in the GitHub repository evalstate/fast-agent (3,929 stars, last pushed 3d ago), licensed Apache-2.0. It adds 52 tokens to every session and 182 once invoked, about $0.0002 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 2026-10-05.

Design and UXagentagent-frameworkagent-skillsclimcpmcp-client
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