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 agentmods add skills/xonovex/platform/astro-guidenpx skills add xonovex/platform --skill astro-guidegit clone --depth 1 https://github.com/xonovex/platformWhat 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 | $0.00083 | $0.00519 |
| Opus 5 | $0.00042 | $0.00260 |
| Sonnet 5 | $0.00017 | $0.00104 |
| Haiku 4.5 | $0.00008 | $0.00052 |
Grade A, and why
astro-guide 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 3d 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 — 30 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Astro Coding Guidelines
Essentials
- Islands architecture - Default to static HTML, hydrate only where needed, see references/islands-architecture.md
- Project structure - Use
src/pages,src/components,src/layouts,src/content, see references/project-structure.md - Content collections - Use
astro:contentwith schema-validated frontmatter; schema design in zod-guide, see references/content-collections.md - Framework components - Integrate React, Vue, or other frameworks, see references/components.md
- Accessibility - Use semantic HTML, alt text, ARIA as needed, see references/accessibility.md
Gotchas
- Default rendering is server-side / static: components don't ship JavaScript unless explicitly hydrated with
client:*directives - Content Collections enforce a Zod schema at build time; an invalid frontmatter field fails the build, not the page
Astro.glob()is build-time and scans at compile; runtime data needsgetStaticPathsor endpoints- Framework components (React/Vue/Svelte) only hydrate on the directive you pick:
client:load,client:idle,client:visible,client:media,client:only
Progressive disclosure
- Read references/islands-architecture.md - Load when deciding which components need client-side JavaScript
- Read references/project-structure.md - Load when organizing files and directories
- Read references/content-collections.md - Load when managing blog posts, docs, or structured content
- Read references/components.md - Load when integrating React, Vue, or other framework components
- Read references/accessibility.md - Load when adding keyboard navigation or screen reader support
What ships with it
8 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.
- 3d ago First seen · 30 lines · 83 tokens per session scan A c7770b69cb58
astro-guide is a skill published in the GitHub repository xonovex/platform (5 stars, last pushed 3d ago), licensed MIT. It adds 83 tokens to every session and 519 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.
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