The body is lean and well-structured with no padding or explanation of concepts Claude already knows; every section (Purpose, Core Workflow, Key Actions, Example, Important Notes) earns its place.

Provides concrete, executable ScienceWorld commands (`pick up OBJ`, `move OBJ to OBJ`, `look at OBJ`) plus a fully worked example with expected output, matching the copy-paste-ready anchor.

A clear 4-step sequence includes an explicit validation checkpoint ('Verify Placement: look at <CONTAINER>') and a 'do not assume success' note, providing the feedback loop expected for placement operations.

A short (under 50 lines), single-purpose skill with well-organized sections and a one-level-deep bundle reference (references/action_primer.md) that elaborates supporting actions, satisfying the simple-skill allowance for a top score.

Names multiple concrete actions — 'Moves a specified object from the environment or inventory into a target container', 'sorting or storing an object in a specific location', 'placing a conductive object in the blue box' — matching the multiple-specific-actions anchor.

Clearly states what it does (move object into a target container based on a classification decision) and provides an explicit 'Use this skill when...' trigger clause, satisfying both what and when.

Includes some natural terms ('sorting or storing', 'after an assessment') but leans on generic phrasing and misses common user variations like 'put X in the box' or named container terms, matching the 'some relevant keywords but missing common variations' anchor; not level 3 because coverage of natural phrasings is incomplete.

Targets a narrow niche — post-assessment placement into classification-specific containers — with concrete example triggers, making it unlikely to fire for unrelated skills.