The body is lean: it gives the exact action, naming rules, and a short example trace without explaining concepts Claude already knows; every section (Purpose, When to Use, Core Instruction, Key Considerations, Example) earns its place.

It provides the executable command "focus on <OBJECT_NAME>" with concrete noun-phrase examples ("dove egg", "copper wire", "beaker") and a copy-paste-ready example trace, which is fully actionable for an instruction-only skill.

The three-step sequence (Identify Target → Execute Focus → Proceed) is clearly ordered, and Step 3's "After receiving a confirmation observation, continue" acts as an explicit checkpoint before the next action; appropriate for a simple, non-destructive single-action skill.

The body is well-organized into clear sections, but the bundle file references/usage_examples.md exists and is never linked or signaled from the body, so a relevant one-level-deep reference is present but not navigable.

Quotes the concrete action syntax "uses the 'focus on OBJ' action, taking the object name as input" and names follow-on actions ("moving or using the object"), giving multiple specific concrete actions rather than vague language.

It explicitly answers both what ("selects and focuses on a specific object... uses the 'focus on OBJ' action") and when ("Use when you have identified a target object... before performing actions like moving or using the object"), with an explicit Use-when clause.

Relevant domain keywords appear ("ScienceWorld tasks", "target object", "a living thing", "moving or using"), but the triggers are framed around the agent's internal state ("when you have identified a target object that meets task criteria") rather than natural phrases a user would say, and common variations are missing.

The niche is tightly scoped to ScienceWorld object selection via the distinct "focus on OBJ" action, making it unlikely to trigger for unrelated skills.