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 fusengine/agents --skill astro-actionsgit clone --depth 1 https://github.com/fusengine/agentsWrote 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/fusengine/agents/astro-actions)<a href="https://agentmods.dev/skills/fusengine/agents/astro-actions"><img src="https://agentmods.dev/badge/skills/fusengine/agents/astro-actions/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/fusengine/agents/astro-actions"><img src="https://agentmods.dev/badge/skills/fusengine/agents/astro-actions.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 | $0.00028 | $0.00946 |
| Opus 5.5 | $0.00011 | $0.00378 |
| Sonnet 5.5 | $0.00006 | $0.00189 |
| Haiku 4.5 | $0.00003 | $0.00095 |
Grade A, and why
astro-actions 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 1mo 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 — 106 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Covers the full action lifecycle from src/actions/index.ts structure through error handling and redirect patterns. Does not cover Astro DB integration in depth (astro-db handles the database layer) or Content Layer schemas (astro-content) — this skill focuses on the request/validation/response boundary.
Astro Actions Expert
Type-safe server functions with automatic validation, standardized errors, and progressive enhancement.
Agent Workflow (MANDATORY)
Before ANY implementation, spawn 3 agents in parallel, one Agent call each with a name:
- fuse-ai-pilot:explore-codebase - Check existing actions in
src/actions/ - fuse-ai-pilot:research-expert - Verify latest Actions docs via Context7/Exa
- mcp__context7__query-docs - Get defineAction and ActionError examples
After implementation, run fuse-ai-pilot:sniper for validation.
Overview
When to Use
- Handling form submissions with server-side validation
- Creating type-safe backend mutations without API boilerplate
- Building progressive enhancement (works without JS)
- Replacing API endpoints for client-server communication
Why Astro Actions
| Feature | Benefit |
|---|---|
defineAction() |
Type-safe server function definition |
| Zod validation | Automatic JSON and FormData parsing |
ActionError |
Standardized error codes and messages |
accept: 'form' |
Direct HTML form submission support |
| Progressive enhancement | Works without JavaScript enabled |
astro:actions |
Client import for type-safe calls |
Core Concepts
Action Structure
What ships with it
7 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.
- 1mo ago Changed a24448c233e2
- 1mo ago First seen · 106 lines · 28 tokens per session scan A d9fc5015bb79
astro-actions is a skill published in the GitHub repository fusengine/agents (32 stars, last pushed 5d ago), licensed MIT. It adds 28 tokens to every session and 946 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.
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