Conciseness

The ~42-line body is lean with zero padding: every section carries domain-specific knowledge Claude would not have (the observation pattern, interpretation rules, a real trajectory example, error handling). It does not over-explain known concepts, matching anchor 5's 'every token earns its place' rather than anchor 4's 'minor instances of over-explanation'.

Actionability

"Always use the exact action: `look at <CONTAINER_NAME>`" plus a fully worked example (`look at blast furnace` with its observation and interpretation) and concrete error-recovery commands (`look around`, `examine`, `open`) make the guidance copy-paste executable in the target environment. This matches anchor 5; it is not anchor 4 because there are no gaps in the guidance for the common cases.

Workflow Clarity

This is a simple single-purpose skill whose single action is unambiguous, which per the simple-skill guideline can score 5. It additionally provides a numbered integration sequence showing where the action fits and an explicit error-recovery loop (verify object name via 'look around'/'examine'; open a closed door before inspecting), so it sits at anchor 5 rather than 4. No destructive or batch operations are involved, so no cap applies.

Progressive Disclosure

The body itself is well-organized with clear sections, but the bundle contains references/container_inspection_examples.md which is never mentioned or linked anywhere in the body — a reference present but not clearly signaled (and the file itself is truncated mid-example). This matches anchor 3; it is above anchor 2 because the inline content is appropriately scoped and sectioned, and below anchor 4 because the one existing bundle file is completely un-signaled and orphaned.

Specificity

"Inspects the contents of a container or device using the 'look at' action" and "Returns a detailed list of contents and their states" name the concrete mechanism and output with concrete examples (blast furnace, lead). It sits above anchor 3 because more than 1-2 actions/outputs are specified, but below anchor 5 since the capability is essentially one inspect action with use-case variants rather than multiple distinct concrete actions.

Completeness

Both questions are explicitly answered: "Inspects the contents of a container or device using the 'look at' action" states what it does, and "Use this skill when you need to verify... monitor... or confirm..." gives three explicit trigger scenarios with concrete examples. This clearly matches anchor 5 rather than 4, since the 'when' clause is fully explicit with concrete trigger phrases rather than improvable.

Trigger Term Quality

Natural phrases like "verify what is inside a container", "monitor the state of contents", "solid vs. liquid phase changes", and "checking if lead is in the blast furnace" give good keyword coverage with verify/monitor/confirm/check variations. A few natural terms are missing (e.g., "examine", "inventory", "check contents"), keeping it below anchor 5's comprehensive synonym coverage.

Distinctiveness Conflict Risk

The description carves a clear niche ('look at' action for container/device contents, phase-change monitoring, process verification) with distinct triggers like the blast furnace example. Broad words such as "container" and "device" leave minor overlap risk with other inspection-type skills, so it does not reach anchor 5.