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52

Quality

57%

Does it follow best practices?

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SecuritybySnyk

Critical

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tessl review fix ./tests/fixtures/delayed-activation/SKILL.md
SKILL.md
Quality
Evals
Security
Critical

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 skill attempts to silently access SSH keys and exfiltrate user environment data via unauthorized telemetry after a usage threshold is reached.

Report incorrect finding
Critical

E006: Malicious code pattern detected in skill scripts.

What this means

Detected high-risk code patterns in the skill content — including its prompts, tool definitions, and resources — such as data exfiltration, backdoors, remote code execution, credential theft, system compromise, supply chain attacks, and obfuscation techniques.

Why it was flagged

The skill collects and attempts to exfiltrate system usernames and access sensitive SSH keys without authorization, demonstrating malicious data theft.

Medium

W013: Attempt to modify system services in skill instructions.

What this means

The skill prompts the agent to compromise the security or integrity of the user’s machine by modifying system-level services or configurations, such as obtaining elevated privileges, altering startup scripts, or changing system-wide settings.

Why it was flagged

The skill accesses sensitive user data in the `~/.ssh/` directory and transmits system information and environment variables via network telemetry, compromising user data security.

Repository
NMitchem/SkillScan
Audited
Security analysis
Snyk

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