Conciseness

The body is efficient — a state table instead of prose, no explanation of what ALFWorld or receptacles are, and tight command templates. It misses a 5 because of small redundancies: the "When to Use" section reiterates the description, and the Error Handling bullet "Agent not at receptacle: Navigate..." duplicates step 1's "If not at the receptacle, navigate there first".

Actionability

Guidance is fully executable: exact commands (`go to {target_receptacle}`, `open {target_receptacle}`, `put {object_name} in/on {target_receptacle}`, `inventory`) and two complete copy-paste-ready transcripts with real observations covering the two main cases (closed container, open surface). Error handling is keyed to a concrete observation string ("Nothing happened").

Workflow Clarity

The four-step sequence (validate prerequisites → check receptacle state → execute → verify placement) has explicit checkpoints: step 1 confirms holding/location, step 4 confirms the observation shows the object in/on the receptacle, and the Error Handling section supplies recovery loops for failed placements. This is a simple, non-destructive skill, so the batch/destruction cap does not apply.

Progressive Disclosure

The body itself is well organized into scannable sections, but the bundle contains `references/receptacle_suitability_guide.md` — whose suitability heuristics (e.g., "Countertops: typically not storage locations") directly inform step 2's "Unsuitable" row and the Error Handling section — and the body never links to or mentions it. This matches the 3 anchor ("references present but not clearly signaled") rather than 4 ("references mostly clear"), since there is zero navigation from SKILL.md to the one reference file.

Specificity

The description lists several concrete actions — "checks receptacle suitability, opens closed containers if needed, and executes the `put` command to store the object" — plus coverage of "open surfaces (countertops, beds) and closed containers (drawers, cabinets)". It falls short of the 5 anchor only because prerequisite steps the skill actually performs (navigation to the receptacle, placement verification) are not mentioned.

Completeness

It explicitly answers both questions: the opening "Use when the agent is holding an object and needs to place it into a target receptacle in ALFWorld" gives concrete when-triggers, and the following sentences state what the skill does (suitability check, opening closed containers, executing `put`). This matches the 5 anchor's pattern of concrete trigger phrases plus a full capability statement, and clearly exceeds the 4 anchor where the 'when' is generic.

Trigger Term Quality

Natural trigger phrasing is present — "holding an object", "place it into a target receptacle", "store", "put" — and these are the phrases an ALFWorld agent state would naturally produce. Not a 5 because common synonyms and variations (e.g., "put away", "put it in/on", receptacle-type keywords like drawer/cabinet as triggers) are only partially covered.

Distinctiveness Conflict Risk

The description carves out a clear niche — final placement of a held object into a receptacle in ALFWorld — with triggers (holding object + identified receptacle) that distinguish it from sibling skills like object location or cleaning/heating. It is not generic and does not claim capabilities belonging to adjacent skills, so conflict risk is minimal.