Conciseness

The body is lean and directive with no padding or explanations of known concepts, but the 'Failure Modes to Prevent' section restates rules already given above ("Don't invent APIs", "Don't skip verification", "Don't commit before verification passes"). Minor over-repetition keeps it at anchor 4 rather than the fully lean anchor 5.

Actionability

Guidance is concrete for an instruction-only skill: named subagent types (Implementation, Verification, Anti-pattern, Code Quality, Commit, Branch/Sync) with specific duties and evidence requirements. Not 5 because directives like "route context" and "Prepare the next phase handoff" are abstract with no stated format or content; not 3 because the bulk of the guidance is executable as written.

Workflow Clarity

The sequence (during phase → after phase → between phases) is clear with explicit validation gates ("Do not advance to the next step until the assigned subagent reports completion", "Commit only after verification passes"). Not 5 because there is no error-recovery feedback loop — nothing says what to do when verification fails (e.g., deploy a fix subagent and re-verify) — leaving a minor checkpoint gap at anchor 4.

Progressive Disclosure

The skill is under 50 lines, requires no external references, and uses well-organized sections (Rules, During/After/Between Phases, Failure Modes) that make navigation trivial. Per the simple-skill guideline, this earns anchor 5 on well-organized structure alone; there are no buried or nested references.

Specificity

"Execute a phased implementation plan using subagents" names the domain and one core action with its mechanism, but does not list several specific actions. It matches the anchor 'names domain and 1-2 concrete actions, but not comprehensive' rather than the level-4 anchor requiring several listed actions.

Completeness

The description explicitly answers both questions: "Execute a phased implementation plan using subagents" (what) and "Use when asked to execute, run, or carry out a plan — especially one created by make-plan" (when, with concrete trigger phrases). This matches the anchor 'clearly and explicitly answers both what AND when with concrete trigger phrases'; it is above the 4 anchor where the 'when' could be more specific.

Trigger Term Quality

"Use when asked to execute, run, or carry out a plan" provides good natural-term coverage with three synonyms (execute/run/carry out) plus the make-plan tie-in. Not 5 because common variations like "implement the plan", "do the plan", or "work through the plan" are missing; not 3 because coverage goes well beyond a single generic keyword.

Distinctiveness Conflict Risk

The pairing with "make-plan" establishes a clear niche (plan execution vs. plan creation), but the standalone trigger word "run" and generic "execute" are broad enough to risk minor overlap with other execution-style skills. Mostly distinct with minor overlap risk fits anchor 4 rather than 5's minimal conflict risk.