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The project demonstrates good security practices by loading API keys and sensitive paths from environment variables. Input sanitization is used for Obsidian note titles to prevent path traversal issues. YAML parsing uses `yaml.safe_load`, which is safer than `yaml.load`. OAuth2 tokens for Google Calendar are managed using Python's `pickle` module; while `pickle` can be insecure if deserializing untrusted data, here it's used for self-managed tokens, reducing this risk. The AnkiConnect URL defaults to `localhost`, limiting direct SSRF risk, but it is configurable. Overall, no `eval` or obvious malicious patterns were found, and network interactions leverage secure libraries.