writing-guidelines
Review docs/prose for Writing Guidelines compliance. Use when asked to "review my docs", "check writing style", "audit prose", "review docs voice and tone", or "check this page against the writing handbook".
63
73%
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Low
Low-risk findings worth noting
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tessl review fix ./skills/writing-guidelines/SKILL.mdLow
Low-risk findings.
2 low severity findings. Worth noting, but not necessarily harmful.
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
The skill uses WebFetch to retrieve guidelines from a public GitHub URL at runtime, and that fetched free-form text is then ingested into the agent’s LLM context to drive the review (outsider-authored public web content).
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
The skill explicitly requires fetching runtime rules from https://raw.githubusercontent.com/vercel-labs/writing-guidelines/main/command.md and uses that fetched content to control the agent's checking logic and output format, constituting a runtime external dependency that directly controls prompts.
- Repository
- vercel-labs/agent-skills
- Commit
f8a72b9
- Audited
- Security analysis
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