Conciseness

The body is mostly dense operational guidance, but the Anti-Patterns section restates rules already given in Phases and Edge Cases (defer requirements, remove confirmation, minimal-diff edits, and the full concurrency caveat each appear twice), and the Design Rationale section is version history rather than executable guidance. This fits 'mostly efficient but includes some unnecessary explanation or could be tightened' better than score 4's 'minor instances' of over-explanation.

Actionability

Guidance is fully executable for an instruction-only skill: exact tool calls ("get_page(\"ops/tasks.md\")"), a concrete ID scheme ("t-YYYYMMDD-NN, NN = next free ordinal that day"), a literal intent-to-action routing table, a copy-paste persisted-page template, and a structured return shape. This matches 'fully executable; copy-paste ready… specific examples cover the common cases'.

Workflow Clarity

Five clearly sequenced phases (Load → Validate → Identify → Execute → Save) with explicit fail-closed validation checkpoints: zero matches → not_found, multiple matches → list candidates and return ambiguous with no mutation, explicit confirmation required for the destructive remove action, and malformed-page recovery handling. This matches 'clear sequence with explicit validation steps; feedback loops for error recovery'; the destructive-operation cap does not apply since confirmation is enforced.

Progressive Disclosure

The skill is a single self-contained file (no references/, scripts/, or assets/ exist) with clear, well-labeled sections and no nested references to verify. It matches 'good structure; most content is appropriately placed; minor organization gaps' — inline non-operational content (Design Rationale, the duplicated anti-patterns) keeps it below the well-organized-overview ideal, and at ~110 lines it exceeds the under-50-line simple-skill exception that would allow a 5.

Specificity

The description enumerates five concrete lifecycle actions ("Add, complete, defer, remove, and review tasks") plus concrete mechanisms ("stable task IDs", "deterministic action routing", "fail-closed ambiguity handling"), giving comprehensive coverage of the skill's capabilities. It clearly matches the 'lists multiple specific concrete actions; comprehensive coverage' anchor rather than the score-4 anchor, which anticipates gaps in coverage.

Completeness

The description has a clear, specific 'what' (task lifecycle management with enumerated actions) but no 'Use when…' clause or equivalent trigger guidance within the description field itself; the explicit trigger phrases live only in the separate `triggers` frontmatter field. Per the rubric guideline, a missing 'Use when…' clause caps completeness at 3, and score 4 is unwarranted since the 'when' is not present in the evaluated text.

Trigger Term Quality

Natural terms like "add… tasks", "complete", "defer", and "task list" appear in the description, giving good keyword coverage, but common variations users say ("to-do", "remind me to", "done with", "what's on my plate") are absent from the description text itself — they only exist in the separate triggers field. This fits 'good keyword coverage; a few natural terms missing', not the comprehensive synonym coverage of score 5.

Distinctiveness Conflict Risk

Mentions of "brain page" and "stable task IDs" carve a clear niche that most skills would not claim, but phrases like "task list" and adding/completing tasks are generic enough that a closely related productivity skill could overlap. This matches 'mostly distinct; minor overlap risk with closely related skills' rather than the score-5 anchor's 'minimal conflict risk'.