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SKILL verified MIT Self-run

Astro Security

skill-fusengine-agents-astro-security · by fusengine

Use when configuring Content Security Policy (CSP) in Astro 6, setting security headers, managing script/style hashes, using nonces, or implementing experimentalStaticHeaders for adapter deployments.

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Install

$ agentstack add skill-fusengine-agents-astro-security

✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.

Security review

✓ Passed

No issues found. Passed automated security review. · v0.1.0 How review works →

  • ✓ Prompt-injection patterns
  • ✓ Secret / credential exfiltration
  • ✓ Dangerous shell & filesystem operations
  • ✓ Untrusted network calls
  • ✓ Known-malicious package signatures

What it can access

  • ✓ Network access No
  • ✓ Filesystem access No
  • ✓ Shell / process execution No
  • ✓ Environment & secrets No
  • ✓ Dynamic code execution No

From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.

View the full security report →

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Reliability & compatibility

✓ Security review passed
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Declared compatibility

Claude CodeClaude Desktop

Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.

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About

Astro Security

Agent Workflow (MANDATORY)

Before ANY implementation, use TeamCreate to spawn 3 agents:

  1. fuse-ai-pilot:explore-codebase - Analyze existing security config, adapters, headers
  2. fuse-ai-pilot:research-expert - Verify latest Astro 6 CSP docs via Context7/Exa
  3. mcp__context7__query-docs - Check CSP compatibility with deployment adapter

After implementation, run fuse-ai-pilot:sniper for validation.

Overview

When to Use

  • Enabling CSP in an Astro 6 project (stable in v6.0.0)
  • Configuring security.csp in astro.config.mjs
  • Adding SHA-256/384/512 hashes for external scripts or styles
  • Using nonces for dynamic script injection
  • Setting up experimentalStaticHeaders for adapter-based CSP headers

CSP in Astro 6

Astro 6 ships Content Security Policy as a stable feature (previously experimental). When enabled:

  • Astro automatically generates SHA hashes for all bundled scripts and styles
  • Injects a ` in each page's `
  • Supports script-src and style-src directives by default

Limitations:

  • Not supported in dev mode — test with build + preview
  • External scripts and styles require manual hash configuration
  • Incompatible with `` view transitions (use native View Transition API)
  • Shiki syntax highlighter (inline styles) not currently supported

Reference Guide

Concepts

| Topic | Reference | When to Consult | |-------|-----------|-----------------| | CSP overview | [csp-overview.md](references/csp-overview.md) | Understanding CSP in Astro 6 | | Configuration | [csp-config.md](references/csp-config.md) | All config options | | Script directive | [script-directive.md](references/script-directive.md) | script-src configuration | | Style directive | [style-directive.md](references/style-directive.md) | style-src configuration | | Nonces | [nonces.md](references/nonces.md) | Dynamic script injection | | Static headers | [static-headers.md](references/static-headers.md) | Adapter-based CSP headers |

Templates

| Template | When to Use | |----------|-------------| | [csp-basic.md](references/templates/csp-basic.md) | Basic CSP enable with algorithm | | [csp-advanced.md](references/templates/csp-advanced.md) | Full config with directives + static headers |

Best Practices

  1. Always test with build + preview — CSP is inactive in dev mode
  2. Start with SHA-512 — strongest hash algorithm
  3. Use 'self' explicitly — not included by default in resources
  4. Hash external scripts manually — compute SHA hashes for CDN resources
  5. Combine with adapter headers — use experimentalStaticHeaders for Vercel/Netlify

Forbidden

  • Testing CSP in dev mode (doesn't work — always use build + preview)
  • Using `` with CSP enabled
  • Forgetting to add 'self' when using resources array
  • Adding unsafe-inline (defeats purpose of CSP)

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

Install and usage instructions live in the source repository linked above.

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Versions

  • v0.1.0 Imported from the upstream source.

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