facebook-marketplace-seller-reference-scraper

CRITICAL E004: Prompt injection detected in skill instructions.

• Potential prompt injection detected (high risk: 0.90). The Skill contains deceptive runtime instructions that direct the agent to auto-install dependencies and intentionally hide or avoid asking the user for confirmation, which is a hidden/overriding instruction outside the stated scraping purpose.

CRITICAL E005: Suspicious download URL detected in skill instructions.

• Suspicious download URL detected (high risk: 0.80). These links point to a third-party CLI installer (browseract.com) and are used by the skill to trigger automatic installation of a runtime dependency without explicit user approval — a risky delivery vector for executables that could distribute malware.

MEDIUM W011: Third-party content exposure detected (indirect prompt injection risk).

• Third-party content exposure detected (high risk: 0.85). SKILL.md instructs the agent to use the runtime browser-act Skill to “capture browser-visible page content” from user-specified Facebook Marketplace/public URLs, which can include outsider-authored free text from fetched web pages and network responses.

MEDIUM W012: Unverifiable external dependency detected (runtime URL that controls agent).

• Potentially malicious external URL detected (high risk: 1.00). The Skill explicitly instructs the agent to automatically install and invoke the BrowserAct CLI at runtime using the installer link https://www.browseract.com/?co-from=ecommerce (and the redirecting installer URL https://www.browseract.com/?co-from=ecommerce&redirect=https://github.com/browser-act/skills/tree/main), meaning the agent will fetch and run remote installation content as a required dependency.