benchmark-testing
Create and launch benchmark test projects to exercise vercel-plugin skill injection across realistic scenarios. Sets up isolated directories, installs the plugin, and spawns WezTerm panes running Claude Code with crafted prompts.
54
60%
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Critical
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tessl review fix ./.claude/skills/benchmark-testing/SKILL.mdSecurity
1 critical severity finding. Installing this skill is not recommended: please review these findings carefully if you do intend to do so.
E004: Prompt injection detected in skill instructions.
What this means
Detected a prompt injection in the skill instructions. The skill contains hidden or deceptive instructions that fall outside its stated purpose and attempt to override the agent’s safety guidelines or intended behavior.
Why it was flagged
The document instructs automated, repeated prompting and explicit phrasing to coerce a plugin/LLM into performing privileged actions (e.g., "Link the project to my vercel-labs team"), which is suspicious steering without clear malicious intent.
Low
Low-risk findings.
1 low severity finding. Worth noting, but not necessarily harmful.
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 installs and runs a remote plugin via npx from https://github.com/vercel/vercel-plugin during setup (line 24), which fetches and executes external code that controls skill injection and thus can directly influence agent prompts.
- Repository
- vercel/vercel-plugin
- Commit
358400a
- Audited
- Security analysis
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