Conciseness

The body is mostly lean with minimal padding, though the 'Red Flags' section largely restates 'Common Mistakes' and the Quick Reference table repeats inline guidance, adding some redundancy. Not a 5 due to that repetition, not a 3 because the prose is generally efficient and assumes Claude's competence.

Actionability

Provides concrete executable commands throughout ('git rev-parse --git-dir', 'git worktree add "$path" -b "$BRANCH_NAME"', 'git check-ignore -q .worktrees', npm/cargo/pip/go setup). The Step 3 'npm test / cargo test / pytest / go test' slash-list is slightly less copy-paste-ready, a minor gap keeping it from a 5.

Workflow Clarity

Clear Step 0→3 sequence with explicit validation checkpoints: submodule guard before concluding isolation, 'git check-ignore' before creating project-local worktrees, baseline test verification, and 'If tests fail: Report failures, ask whether to proceed' feedback loop. Fully meets the top anchor including error-recovery loops.

Progressive Disclosure

A self-contained skill with no external bundle files and no need for them; it is well-organized into Overview, numbered Steps, Quick Reference, Common Mistakes, and Red Flags sections. Per the simple-skill scoring note, well-organized single-file content with no external-reference need scores 5.

Specificity

Lists several concrete actions — 'ensures an isolated workspace exists', 'via native tools or git worktree fallback' — with only minor coverage gaps (e.g., no mention of cleanup or branch management). It is not a 5 because the action set is not fully comprehensive, and not a 3 because more than 1-2 actions are named.

Completeness

Explicitly answers both 'what' ('ensures an isolated workspace exists via native tools or git worktree fallback') and 'when' ('Use when starting feature work that needs isolation... or before executing implementation plans') with concrete trigger phrases. Clearly meets the top anchor.

Trigger Term Quality

Includes natural user phrases like 'starting feature work', 'before executing implementation plans', and 'needs isolation from current workspace', but misses common synonyms such as 'feature branch', 'sandbox', or 'parallel work'. Good coverage but a few natural terms are absent, so not a 5.

Distinctiveness Conflict Risk

Targets a clear niche (workspace isolation for feature work) with distinct triggers like 'git worktree fallback' and 'native tools', but has minor overlap risk with general git or environment-setup skills. Not a 5 due to that residual overlap, not a 3 because the niche is clearly stated.