Conciseness

The ~60-line body is lean: a compact interaction table, short workflow steps, and a single worked example, with no explanations of concepts Claude already knows. Details like "tools are typically stationary appliances" and "The agent must be holding the target object before most interactions" each earn their tokens; anchor 4 would require trimmable over-explanation, which is absent.

Actionability

The body gives copy-paste-ready commands — the interaction table ("`clean knife 1 with sinkbasin 1`") and the full executable trajectory ("go to countertop 1" → "clean knife 1 with sinkbasin 1") — covering the common cases. This matches the anchor-5 example of fully executable, example-covered guidance; anchor 4 would imply minor gaps in the concrete commands.

Workflow Clarity

The four-step workflow (Identify → Locate and Acquire → Execute → Verify Outcome) includes an explicit validation checkpoint ("Check the environment observation after the action") and an Error Handling section with recovery guidance ("Reassess whether the agent is at the correct location and holding the correct object", "Use `take` first"). That feedback loop matches anchor 5; anchor 4 would require missing or merely implicit checkpoints, which is not the case.

Progressive Disclosure

Per the guideline to score against the actual bundle: `references/action_reference.md` and `references/trajectory_example.md` exist but are never referenced or linked anywhere in the body, while overlapping content (the action table and error signals) is inlined instead. This matches anchor 3 ("references present but not clearly signaled; content that should be separate is inline") — not anchor 4, since the references are entirely orphaned rather than mostly clear, and not anchor 2, since the body itself is well-structured rather than minimal.

Specificity

The description lists multiple concrete actions — "cleaning, heating, cooling, or examining" and "executing the correct environment action (e.g., `clean`, `heat`, `cool`, `use`)" — plus the two-part locating behavior ("locating both the tool and target object"), giving comprehensive coverage of the domain. Anchor 4 would require minor gaps in coverage, but the verb list spans the skill's full interaction set.

Completeness

It explicitly answers 'when' with a concrete "Use when the agent needs to apply a tool..." clause and 'what' with "handles locating both the tool and target object, then executing the correct environment action". Both are present, explicit, and concrete, matching the anchor-5 example pattern; anchor 4 would require the 'when' to be less specific.

Trigger Term Quality

Natural trigger phrases like "apply a tool to a target object" and "cleaning, heating, cooling, or examining" mirror how ALFWorld tasks are phrased, giving good keyword coverage. It falls short of anchor 5 because no synonyms or task-phrasing variants (e.g., "wash", "examine X with Y") are included.

Distinctiveness Conflict Risk

Scoping to "ALFWorld" tool-to-object interactions with distinct action verbs carves out a clear niche with minimal overlap risk against other skills. Anchor 4 would imply meaningful overlap with closely related skills, which the domain-specific scoping avoids.