Conciseness

The body is two lines — a provenance comment and a single pointer instruction — with no padding, no explanation of concepts Claude already knows, and nothing to trim. Every token earns its place, matching the lean-and-efficient anchor exactly.

Actionability

The one instruction is concrete ("Load and follow the shared skill at ~/.agents/skills/using-git-worktrees/SKILL.md"), but the referenced file does not exist — neither in the bundle (no references/, scripts/, or assets/ directories) nor on disk — so executing the load step dead-ends. There is no inlined guidance and no fallback, leaving the guidance concrete but incomplete; it is below the 4 anchor's 'minor gaps' and above the vague/abstract anchors.

Workflow Clarity

The single action is unambiguous (load a specific file, then follow it), which under the simple-skill note could score 5 — but there is no checkpoint or fallback for the case where the referenced shared skill is unresolvable, which is a real gap here. It fits the 4 anchor: clear sequence with a minor gap.

Progressive Disclosure

The single reference is clearly signaled and one level deep, but it points outside the bundle to a file that is absent, and the body's "Generated by scripts/agent-harnesses.py" mentions a script that is not in the bundle either. With zero overview content inlined, the SKILL.md is an empty shell whose one hop leads nowhere — matching the 'some structure but references unresolvable / could be better organized' band more than the 4 anchor's 'minor organization gaps'.

Specificity

The description lists multiple concrete capabilities with exact detail: "Explains the ~/.worktrees/<path-key>/<branch> worktree convention, the dotfiles-repo opt-in, and what a dotfiles worktree cannot validate" — including the literal path pattern. Coverage is comprehensive for its explanatory scope (convention, opt-in, limitations, and explicit delegation of create/switch/delete), so it exceeds the 'several specific actions with minor gaps' anchor.

Completeness

Both parts are explicit: the 'what' ("Explains the ~/.worktrees/<path-key>/<branch> worktree convention, the dotfiles-repo opt-in, and what a dotfiles worktree cannot validate") and the 'when' ("Use to understand or explain worktree layout and its constraints"), plus an explicit anti-trigger delegating actions to the git-worktree skill. It clearly matches the both-what-and-when-with-concrete-triggers anchor rather than the 4 anchor where 'when' could be more explicit.

Trigger Term Quality

Good natural keyword coverage: "worktree convention", "worktree layout", "dotfiles-repo", "create, switch to, or delete" — phrases a user would plausibly say. It misses common variations such as "working tree", "parallel checkout", or "multiple branches at once", so it falls just short of the comprehensive-synonyms anchor at 5.

Distinctiveness Conflict Risk

"use the git-worktree skill to actually create, switch to, or delete one" explicitly disambiguates this explanatory skill from its sibling action skill, carving out a clear niche with minimal conflict risk — the strongest fit to the 'clear niche with distinct triggers' anchor.