Conciseness

The ~30-line body is lean and assumes competence: a short purpose statement, a 3-step workflow, a parameter list with inline examples, one example thought, and a one-line action template. It falls short of anchor 5 only because the 'Purpose' section restates the frontmatter description almost verbatim and the action template adds little beyond the workflow, so a few tokens could be trimmed.

Actionability

Concrete elements exist — required parameters with example values, a worked example invocation thought, and the template `move <target_object> in inventory to <green/blue> box` — but the guidance is undermined by an internal contradiction: the Decision Logic says 'If `measurement_result < threshold`: Destination is the **green box**', directly contradicting the description and Purpose ('blue' for below). An executor cannot determine the correct action for the below-threshold case, which is a missing/wrong key detail rather than a minor gap, so it sits at anchor 3 rather than anchor 4.

Workflow Clarity

The sequence (Prerequisites → Decision Logic → Execution) is clearly listed and this is a simple, non-destructive single-placement skill, but the core decision step is self-contradictory (both branches route to the green box), making the workflow's pivotal checkpoint incoherent. That coherence flaw places it at anchor 3 — steps present with a significant gap — rather than anchor 4's 'clear sequence with only minor gaps' or the simple-skill 5.

Progressive Disclosure

The body itself is well-sectioned and under 50 lines, but the bundle contains `references/action_primer.md` (with the environment's actual action syntax, e.g. `move <OBJ> to <OBJ>`, and room names) that is never referenced or signaled anywhere in the body — and the body's action template even conflicts with it. Per the guideline to score against the actual bundle structure, this is 'references present but not clearly signaled', matching anchor 3; it would need an explicit, well-signaled link to the primer to reach anchor 4.

Specificity

The description names concrete actions — "Moves an object to one of two destination containers based on a numeric threshold check" and the explicit branches "Place object in 'green' box if value > threshold, or 'blue' box if value < threshold" — which is specific and actionable. It falls short of anchor 5 because it covers only the single placement action rather than multiple comprehensive capabilities (e.g., no mention of how the measurement itself is obtained), but is well above anchor 3's '1-2 concrete actions, not comprehensive' minimalism.

Completeness

It explicitly answers both questions: what ("Moves an object to one of two destination containers based on a numeric threshold check", with the conditional logic spelled out) and when ("Trigger after a measurement (e.g., temperature) is taken") — a concrete, explicit trigger clause. This matches anchor 5's 'clearly and explicitly answers both what AND when with concrete trigger phrases'; anchor 4's 'when could be more explicit' does not apply since the trigger condition is stated directly.

Trigger Term Quality

Natural trigger terms are present: "measurement", "temperature", "threshold", "green"/'blue' box, "place" — phrases a user or agent would plausibly say when needing this skill. A few natural variations are missing (e.g., 'thermometer', 'reading', 'exceeds'), keeping it below anchor 5's comprehensive synonym coverage, but it clearly exceeds anchor 3's partial coverage.

Distinctiveness Conflict Risk

The description carves out a clear niche — conditional two-container placement driven by a numeric threshold comparison after a measurement — with distinct trigger terms ('green' box, 'blue' box, threshold) that are unlikely to fire for unrelated skills. Conflict risk is minimal, matching anchor 5.