Lists multiple specific concrete actions and domains: injection types (SQL, command, XSS), cryptography, filesystem safety, network security, cookies, secrets management, memory safety, logging, and security tools configuration.

Clearly answers both 'what' (security best practices covering injection, crypto, filesystem safety, etc.) and 'when' ('Apply when writing, reviewing, or auditing Go code for security, or when working on any risky code involving crypto, I/O, secrets management, user input handling, or authentication').

Includes strong natural keywords users would say: 'SQL', 'XSS', 'crypto', 'secrets management', 'user input handling', 'authentication', 'Go code', 'security', 'vulnerability', 'auditing'. Good coverage of terms across security domains.

Clearly scoped to Golang security specifically, with distinct triggers around Go code + security concerns. The combination of language-specific (Golang) and domain-specific (security) focus makes it unlikely to conflict with general Go skills or general security skills.

The skill is generally well-organized and avoids explaining basic Go concepts, but includes some redundancy — the severity levels appear in multiple tables, DREAD is mentioned repeatedly, and some sections like 'Security Thinking Model' and 'Research Before Reporting' are somewhat verbose for what Claude already understands about security analysis. The anti-patterns and common mistakes tables overlap conceptually. However, most content earns its place.

The quick reference table and common mistakes table provide concrete guidance, and the tooling section has executable commands. However, the skill heavily delegates to reference files for actual code examples and detailed implementation. The main body lacks executable Go code snippets showing secure vs insecure patterns — it describes what to do rather than showing how. The audit/review mode descriptions are procedural but lack concrete examples of output format or specific grep patterns.

The three modes (Review, Audit, Coding) are clearly defined with distinct workflows. The audit mode specifies parallel sub-agents with five explicit domains. The 'Research Before Reporting' section provides a clear 4-step investigation workflow with severity adjustment guidance and documentation requirements. The review mode traces data flows sequentially. Validation is addressed through tooling (gosec, govulncheck, race detector) and the checklist reference.

Excellent progressive disclosure structure — the main skill provides a concise overview with quick reference tables, then clearly signals 11+ reference files organized by domain (cryptography, injection, filesystem, etc.) with descriptive one-line summaries. References are one level deep and well-organized. Cross-references to other skills are clearly marked. The checklist is appropriately separated into its own reference file.