Conciseness

The body is dense procedural instruction (commands, state-recovery matrices, naming conventions) with little concept explanation, but repetition is noticeable: the no-approval-gate point is restated roughly eight times, the 'archaeological evidence' branch-retention rationale appears three times, and the Guidelines DO/DON'T section largely recaps body content. This matches anchor 4 (minor instances that could be trimmed) rather than 5 (every token earns its place).

Actionability

Fully executable guidance throughout: copy-paste bash for worktree creation and PR merges ('git worktree add ... -b ... feature/<feature>', 'gh pr merge <pr-number> --merge'), deterministic pre-condition checks, exact PR-state lookup commands ('gh pr view slice/<number>-<kebab-name> --json state -q .state'), exact naming conventions, and a concrete script invocation with parsed JSON output. Matches the 5 anchor.

Workflow Clarity

Phases 0-5 are clearly sequenced with explicit validation (pre-conditions, preflight bootstrap check, signal fix-retry loop bounded by max_signal_iterations: 3), idempotent resume detection, merge-conflict recovery, failure-to-exit-to-dispatcher-retry feedback loops, and TODO checklists. Slight phase-numbering overlap between sequential and parallel modes is mitigated by per-section 'Applies only to' labels, so it matches 5 rather than 4.

Progressive Disclosure

Three real, one-level-deep reference files (subagent-prompt-template.md, error-handling.md, release-strategy.md) each with a when-to-read signal, plus a scripts directory; all verified to exist. Minor gaps: the References section says to read the subagent template 'when spawning subagents in Phase 4' (spawning actually happens in Phase 2/Tier 0 and Phase 3), and release-strategy.md is triggered by 'when the user asks about releasing' in a skill that explicitly has no human in the loop. Matches anchor 4 (minor organization gaps) rather than 5.

Specificity

Lists multiple concrete actions covering both modes comprehensively: 'Implements a mainspec end-to-end by auto-detecting mode', 'commits slices in order on the current feature/<feature> branch', 'per-slice worktrees, branches, PRs, and auto-merge'. No vague filler and no coverage gaps, matching the 5 anchor rather than 4.

Completeness

The 'what' is explicit and detailed, and the 'when' is present as equivalent explicit trigger guidance ('invoked headless by the harness dispatcher with the feature slug as its single argument'). It is framed as invocation mechanics rather than a direct use-condition, so it matches anchor 4 ('when' could be more explicit) rather than 5, and clearly not 3 since the when is explicit rather than merely implied.

Trigger Term Quality

Good keyword coverage with domain-natural terms ('mainspec', 'slices', 'worktrees', 'PRs', 'auto-merge', 'feature branch', 'dispatcher'), but the vocabulary is jargon-heavy and missing common variations or synonyms a user might naturally say, so it fits 4 rather than 5.

Distinctiveness Conflict Risk

Highly distinct vocabulary ('mainspec', 'slice-implementer', 'feature/<feature>', 'dispatcher') establishes a clear niche with minimal conflict risk against other skills, matching the 5 anchor.