The Agent Skills Directory

Indirect Prompt Injection (LOW): The skill is designed to ingest and process external data (source code files) which represents a potential injection surface.
Ingestion points: The skill uses Read, Grep, and Glob tools to read the content of files provided by the user or found in the environment.
Boundary markers: Absent. The instructions do not specify delimiters or provide warnings to ignore instructions that might be embedded within the code comments of the files being read.
Capability inventory: The skill is limited to read-only file system tools. It does not have access to tools for network communication (curl, fetch), arbitrary command execution (shell, subprocess), or file modification.
Sanitization: No sanitization of the input file content is performed before the agent processes it for explanation.
Conclusion: While an attacker could embed malicious instructions in code comments (Indirect Prompt Injection), the agent has no high-privilege tools to execute those instructions or exfiltrate data. The risk is limited to the agent producing a misleading or biased explanation.

code-explainer