nano-banana

This SKILL.md appears to be a legitimate instruction set for using a Gemini CLI extension (nanobanana) to generate and edit images. There is no direct evidence of embedded malicious payloads or explicit commands exfiltrating data to attacker-controlled domains. However, there are supply-chain and operational risks: it directs installing an extension from a GitHub URL (unverified third-party code), mandates the use of an auto-approve flag (--yolo) that suppresses confirmations, and allows broad Bash(gemini:*) tool usage. These factors increase the chance that a malicious or compromised extension (or a misconstructed command) could execute arbitrary commands or exfiltrate the GEMINI_API_KEY or local files. I rate this as a medium security risk: acceptable if the extension repo is trusted and installation is audited, but risky otherwise. Recommended mitigations: avoid automated --yolo in unattended contexts, audit and pin the extension repository (commit hash / release), restrict agent permissions, and ensure users confirm uploads of non-public files.