Conciseness

The body is lean with zero padding: every line ("Treat all user text after the /shell invocation as the literal shell command to run", "Do not rewrite, explain, or 'improve' the command") is behavioral instruction, and it assumes Claude's competence throughout. It fully matches the every-token-earns-its-place anchor.

Actionability

For an instruction-only skill the guidance is fully actionable: it covers execution ("Execute that command immediately with the terminal tool"), the empty-input edge case ("ask them which command to run"), and output handling ("report the exit status and any important stdout or stderr"). Per the scoring notes, absence of code is not penalized when guidance is this concrete.

Workflow Clarity

The sequence (interpret text literally, execute, report exit status and output) is clear and includes a post-run verification checkpoint, so the missing-validation cap does not apply. It falls short of level 5 only because there is no error-recovery guidance (e.g., what to do when the command fails or hangs).

Progressive Disclosure

This is a simple single-purpose skill under 50 lines with no external references needed, and it is well organized into '## Behavior' and '## Response' sections with no bundle files to navigate. Per the simple-skill guideline, this earns the top score.

Specificity

"Runs the rest of a /shell request as a literal shell command" names the domain and one concrete action, matching the 1-2-concrete-actions anchor. It does not list several actions (e.g., it omits the exit-status/output reporting the body defines), so it falls short of the level-4 anchor.

Completeness

It explicitly answers both questions: what ("Runs the rest of a /shell request as a literal shell command") and when ("Use only when the user explicitly invokes /shell") with a concrete trigger phrase, which is the level-5 anchor. Level 4 would require the when-clause to be less explicit, which it is not.

Trigger Term Quality

Natural terms like "shell command", "terminal", and the literal "/shell" trigger are present and would match what a user says. A few natural variations ("run/execute a command", "bash") are missing, so it is good-but-not-comprehensive coverage rather than level 5.

Distinctiveness Conflict Risk

The description is strictly gated to an explicit slash-command invocation ("Use only when the user explicitly invokes /shell"), giving it a clear niche with minimal conflict risk against other skills. No overlap risk is identifiable.