browse
Fast headless browser for QA testing and site dogfooding. Navigate any URL, interact with elements, verify page state, diff before/after actions, take annotated screenshots, check responsive layouts, test forms and uploads, handle dialogs, and assert element states. ~100ms per command. Use when you need to test a feature, verify a deployment, dogfood a user flow, or file a bug with evidence.
Security
3 findings — 1 high severity, 2 medium severity. You should review these findings carefully before considering using this skill.
W007: Insecure credential handling detected in skill instructions
What this means
The skill handles credentials insecurely by requiring the agent to include secret values verbatim in its generated output. This exposes credentials in the agent’s context and conversation history, creating a risk of data exfiltration.
Why it was flagged
Insecure credential handling detected (high risk: 0.90). The skill exposes commands that take sensitive values as literal arguments (e.g., cookie <name>=<value>, header <name>:<value>, fill ... "password", cookie-import with JSON), which would require the LLM to include secret strings verbatim in generated commands/outputs, creating an exfiltration risk.
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: 1.00). The skill is a headless browser that explicitly navigates arbitrary URLs (e.g., "goto <url>" in SKILL.md and the command reference) and then reads and evaluates page content via commands like text, html, links, js/eval and meta 'diff' (see src/read-commands.ts and src/meta-commands.ts), so it ingests untrusted public web content which can directly influence subsequent actions.
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's one-time setup step runs `curl -fsSL https://bun.sh/install | bash` if bun is missing, which fetches and immediately executes remote code during runtime (curl | bash) and is presented as a required dependency for building/running the skill.
- Repository
- garrytan/gstack
- Commit
c86faa7
- Audited
- Security analysis
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