A Skill Is More Than a Markdown File: Vetting scaffold-docs Against OWASP’s Agentic Skills Top 10
A documentation skill sounds like a low-risk addition to an AI agent. It reads code, proposes an outline, and helps write documentation. But those activities cross security boundaries. The skill reads repository content that someone else may control, carries context between sessions, and asks an agent to write files. Its safety depends on both its instructions and the permissions available to the…
Claiming documentation skill as a low-risk addition to an AI agent is misguided, as it has the potential to breach security boundaries. Even though such skills can read code, propose outlines, and write documentation, their safety hinges on both their instructions and the permissions granted to the agent. To evaluate scaffold-docs, an existing documentation-writing skill, against OWASP’s Agentic Skills Top 10, we performed a thorough assessment.
The skill organizes documentation into three main sections: Getting Started, Diving Deeper, and Reference. The workflow involves a user selecting an audience, reviewing the structure, and approving successive drafting passes. An update mode utilizes stored metadata to reconcile documentation after code changes. For our evaluation, we pinned the review to commit e234e13eb1ab9561a1da9a5a150c3deee3c515b8, which is crucial since a security assessment applies to the content reviewed, not the content on the default branch later.
The assessment covered all 15 tracked files, including hidden metadata, phase instructions, bundled references, and historical implementation plans. No malicious payloads were found in that snapshot. However, the review revealed several crucial gaps in security. First, the skill asks the agent to read comments, examples, existing documentation, and audience metadata without explicitly separating these inputs from instructions that could authorize actions.
Second, file-access scope was undefined, with relative output names not establishing where writes were permitted. Third, installation guidance allows copying or symlinking the skill directory without a package-wide integrity check.
These findings highlight the importance of precise language and clear boundaries when dealing with AI agents and documentation skills. While the absence of malicious payloads in the snapshot is a positive sign, it does not guarantee safety. Instead, the focus should be on identifying and addressing potential weaknesses in trust, permissions, and state management.
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