A guide for building Astro websites and components with Astro, a web framework that can combine server-rendered pages with interactive user-interface parts. It covers Astro configuration, TypeScript files, content collections, routing, and build checks.

Use it when creating or editing .astro or .tsx files, configuring Astro, managing collections of content such as blog posts, or fixing TypeScript and build errors.

It helps avoid outdated Astro patterns and catches TypeScript errors and build warnings while changing an Astro project.

How holger1411/astrodeck configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to holger1411/astrodeck. 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/holger1411/astrodeck/main/.claude/skills/astro/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/holger1411/astrodeck

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/holger1411/astrodeck/astro/github.svg)](https://agentmods.dev/skills/holger1411/astrodeck/astro)

Your own site

<a href="https://agentmods.dev/skills/holger1411/astrodeck/astro"><img src="https://agentmods.dev/badge/skills/holger1411/astrodeck/astro/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/skills/holger1411/astrodeck/astro"><img src="https://agentmods.dev/badge/skills/holger1411/astrodeck/astro.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 33 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,184 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. Third-party audits

NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

medium MCP Rug Pull · line 16
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]

How audits are shown

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	$0.00033	$0.01184
Opus 5.5	$0.00013	$0.00474
Sonnet 5.5	$0.00007	$0.00237
Haiku 4.5	$0.00003	$0.00118

Measured 2mo ago against content hash f64a2840cd2c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

astro 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 2mo 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.

.claude/skills/astro/SKILL.md · 189 lines

How it starts

The opening of the file, as written. The whole thing — 189 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Astro Framework Skill

Domain

Astro 6+ patterns, Islands Architecture, Content Collections, routing, build

KPIs

Metric	Target	Measurement
TypeScript Errors	0	`npx tsc --noEmit 2>&1 \| grep "error TS" \| wc -l`
Build Warnings	0	`npm run build 2>&1 \| grep -i "warn" \| wc -l`
Build Time	<3s	`npm run build` timing output
Deprecated patterns / relative imports	0	`npm run check:kpis`

Rules

ClientRouter (NOT ViewTransitions)

---
// ✅ Astro 6
import { ClientRouter } from 'astro:transitions';
---
<head>
  <ClientRouter />
</head>

// ❌ Deprecated
import { ViewTransitions } from 'astro:transitions';

Zod Import

// ✅ Astro 6
import { z } from 'astro/zod';

// ❌ Deprecated
import { z } from 'astro:content';
import { z } from 'astro:schema';

Content Collections

// src/content.config.ts
import { defineCollection } from 'astro:content';
import { z } from 'astro/zod';
import { glob } from 'astro/loaders';

const blog = defineCollection({
  loader: glob({ pattern: '**/*.{md,mdx}', base: './src/content/blog' }),
  schema: z.object({
    title: z.string(),
    description: z.string(),
    pubDate: z.coerce.date(),
    draft: z.boolean().optional(),
  }),
});

export const collections = { blog };

---
// Usage in pages
import { getCollection } from 'astro:content';
const posts = await getCollection('blog');
---

.astro vs .tsx Decision

Use .astro when...	Use .tsx when...
Static content	Client-side interactivity needed
Server-side rendering	State management needed
Layout components	Event handlers needed
Section components	Forms with validation
SEO/meta components	Complex UI (dialogs, dropdowns)

Client Directives

<!-- Load immediately (above-the-fold interactivity) -->
<Component client:load />

<!-- Load when visible (below-the-fold) -->
<Component client:visible />

<!-- Load on idle (non-critical UI) -->
<Component client:idle />

<!-- Only on a specific platform -->
<Component client:only="react" />

Read the full file on GitHub · 189 lines

Files

What ships with it

1 file 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.

LEARNINGS.md 370 B

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.

2mo ago Changed f64a2840cd2c
2mo ago First seen · 189 lines · 33 tokens per session scan A 579ad05fbe20

Subscribe to this mod's changes

astro is a skill published in the GitHub repository holger1411/astrodeck (81 stars, last pushed 2mo ago), licensed MIT. It adds 33 tokens to every session and 1,184 once invoked, about $0.0001 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.

Frontend

astro next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
astroholger1411/astrodeck	Skill	81	2mo ago	MIT	A	33	Claude Code
imagegenopenai/codex	Skill	133k	yesterday	Apache-2.0	A	113	Codex
playwright-climicrosoft/playwright	Skill	99k	yesterday	Apache-2.0	A	19	Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginners	Skill	79k	4d ago	MIT	A	200	Claude Code, Codex
systematic-debuggingobra/superpowers	Skill	313k	3d ago	MIT	A	21	Claude Code
next-cache-components-adoptionvercel/next.js	Skill	143k	today	MIT	A	95	Claude Code
next-partial-prefetching-adoptionvercel/next.js	Skill	143k	today	MIT	A	103	Claude Code

astrodeck: Skill for Claude Code