Lists multiple concrete actions: 'Review, create, and validate Bash scripts' along with specific quality dimensions like 'strict mode, quoting safety, portability, interpreter-compatible behavior.'

Clearly answers both what ('Review, create, and validate Bash scripts') and when ('when shell work needs strict mode, quoting safety, portability, or interpreter-compatible behavior'). The 'when' clause is integrated naturally into the sentence with explicit trigger conditions.

Includes 'Bash scripts' and 'shell' as natural keywords, plus technical terms like 'strict mode', 'quoting safety', and 'portability' that knowledgeable users would use. However, it misses common variations like '.sh files', 'shell scripting', 'shellcheck', 'bash syntax', or 'shebang' that users might naturally say.

Clearly scoped to Bash/shell scripting with specific quality concerns (strict mode, quoting safety, portability), making it highly distinguishable from general coding skills or other language-specific skills.

The content is reasonably efficient but includes some meta-commentary and philosophical framing ('Philosophy', 'Anti-Patterns') that Claude doesn't need. Sections like 'Avoid' and 'Anti-Patterns' overlap conceptually. The 'Inputs' and 'Outputs' sections are terse but read more like a schema stub than actionable guidance.

The skill lacks any concrete code, commands, or executable examples. The workflow is described abstractly ('Check strict mode, quoting, arrays, traps, paths, and temporary files') without showing what to check or how. The 'Examples' section lists use-case descriptions rather than input/output pairs with actual code. There is no shellcheck invocation example, no sample script review, and no copy-paste-ready commands.

The workflow section provides a reasonable sequence (identify shell, check issues, run shellcheck, report fixes) and the validation section includes a fail-fast gate. However, the steps are vague and lack explicit validation checkpoints with concrete commands. For a skill involving potentially destructive shell changes, the absence of specific validation commands and feedback loops caps this at 2.

The skill references multiple external files (contract.yaml, evals.yaml, task-profile.json, deferred context directory) with clear paths, which is good structure. However, no bundle files were provided to verify these references exist, and the main content itself is thin enough that the references feel like they're compensating for missing substance rather than appropriately splitting detailed content.