The Agent Skills Directory

[EXTERNAL_DOWNLOADS]: The deployment instructions in SKILL.md reference a remote installation script for the NextDNS CLI from https://nextdns.io/install. This targets the official domain of a well-known DNS security service.
[REMOTE_CODE_EXECUTION]: Documentation in SKILL.md describes an installation workflow that pipes a remote shell script from nextdns.io directly into a shell interpreter (sh). This is the vendor's standard installation method for the utility.
[PRIVILEGE_ESCALATION]: Deployment commands in SKILL.md use sudo to modify system-level configuration files such as /etc/systemd/resolved.conf and to install the NextDNS client. These operations are required for managing endpoint DNS resolution behavior.
[INDIRECT_PROMPT_INJECTION]:
Ingestion points: The scripts scripts/agent.py and scripts/process.py ingest DNS query logs from the NextDNS API or as internal data objects for analysis.
Boundary markers: No explicit delimiters or boundary warnings are present in the log processing logic.
Capability inventory: The skill possesses capabilities for network requests (via requests) and file system writes (for reporting), but lacks high-risk execution sinks like eval() or subprocess calls that could be triggered by data content.
Sanitization: The domain analysis logic performs statistical calculations (entropy) without dedicated sanitization of the input strings, though the impact is limited to metadata reporting.
[OBFUSCATION]: The script scripts/process.py contains a Base64-encoded URL (aHR0cHM6Ly9leGFtcGxlLmNvbQ) used within a domain name to simulate a DNS tunneling attack for detection testing. This is used as benign sample data for the security analysis tool.

implementing-zero-trust-dns-with-nextdns