acul-screen-generator
Generates complete, branded Auth0 Advanced Custom Universal Login (ACUL) screen implementations using the React or Vanilla JS SDK. Use when a developer asks to create, add, or modify ACUL login screens with custom branding, social login, theming, or specific authentication flows. Triggers on requests like "generate a custom login screen", "add a signup screen to my ACUL project", "customize my Auth0 Universal Login with our brand colors", "apply our theme to all ACUL screens", or any task involving Auth0 Universal Login customization with @auth0/auth0-acul-react or @auth0/auth0-acul-js.
73
92%
Does it follow best practices?
Impact
—
No eval scenarios have been run
Advisory
Suggest reviewing before use
Security
3 findings — 3 medium severity. This skill can be installed but you should review these findings before use.
W011: Third-party content exposure detected (indirect prompt injection risk)
What this means
The skill exposes the agent to untrusted, user-generated content from public third-party sources, creating a risk of indirect prompt injection. This includes browsing arbitrary URLs, reading social media posts or forum comments, and analyzing content from unknown websites.
Why it was flagged
Third-party content exposure detected (high risk: 0.85). The required runtime workflow fetches and parses outsider-authored free text from public GitHub markdown sources (either `auth0-acul-samples` or `universal-login` SDK examples) in Phase 2B/2C, and that fetched prose is then used to generate code and LLM context.
W012: Unverifiable external dependency detected (runtime URL that controls agent)
What this means
The skill fetches instructions or code from an external URL at runtime, and the fetched content directly controls the agent’s prompts or executes code. This dynamic dependency allows the external source to modify the agent’s behavior without any changes to the skill itself.
Why it was flagged
Potentially malicious external URL detected (high risk: 1.00). The skill explicitly requires fetching reference implementations at runtime from GitHub (e.g., https://github.com/auth0-samples/auth0-acul-samples/... and https://github.com/auth0/universal-login/blob/master/packages/auth0-acul-react/examples/<screen-name>.md), and uses that fetched content to determine hook patterns and to drive code/prompt generation, so these URLs are runtime external dependencies that directly control the agent’s instructions.
W021: Hidden or invisible Unicode characters detected (potential obfuscation or prompt injection)
Why it was flagged
Hidden Unicode characters detected (1 type(s) found)
- Repository
- auth0/agent-skills
- Commit
bdf0dc2
- Audited
- Security analysis
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