Conciseness

The ~30-line body is efficient and assumes competence, with only minor trimmable over-explanation such as 'Upon arrival, carefully read the environment's observation. It will describe the receptacle's state and any contents.' Not 5 because a few phrases restate what the observation step already implies; not 3 because there is no padding or explanation of concepts Claude already knows.

Actionability

Gives exact executable commands ('go to {target_receptacle}', 'open {recep}', 'toggle {obj} {recep}', 'put pen 3 in/on garbagecan 1') plus a fully worked trajectory example covering the common ready-state case. Not 4 because the guidance is complete and copy-paste ready within the ALFWorld action language, with concrete example observations to match against.

Workflow Clarity

Clear four-step sequence (Navigate → Observe → Analyze & Prepare → Confirm) with a Confirm checkpoint and an explicit error-recovery branch ('Nothing happened' → abort and re-plan). Not 5 because the blocked-state path lacks an explicit retry loop if the confirmation step shows the receptacle is still not ready; not 3 because validation and error handling are largely present.

Progressive Disclosure

The body itself is well-organized with clear sections, but the bundle contains references/action_primer.md — a relevant action-syntax reference defining the {obj}/{recep} placeholders used in the body — that is never mentioned or linked from the body. Not 4 because the one provided reference is entirely un-signaled and therefore undiscoverable; not 2 because the body content is appropriately placed and structured rather than inlining content that belongs elsewhere.

Specificity

Names several concrete actions — 'verifies and prepares a target receptacle', 'navigating to the receptacle, observing its state (e.g., open/closed, occupied)', 'preparatory actions like opening it' — with only minor generic vagueness in 'any necessary preparatory actions'. Not 5 because 'preparatory actions' is slightly abstract; not 3 because multiple specific actions are explicitly listed.

Completeness

Explicitly answers both: what ('verifies and prepares a target receptacle... involves navigating... observing its state... preparatory actions') and when ('It is triggered before placing an item into a receptacle (e.g., a garbage can)') with a concrete trigger example. Not 4 because the when-clause is explicit and specific rather than merely adequate.

Trigger Term Quality

Includes natural trigger language like 'triggered before placing an item into a receptacle (e.g., a garbage can)' and state terms 'open/closed, occupied'. Not 5 because it omits the most common goal phrasing 'put X in/on Y' and receptacle synonyms; not 3 because coverage of natural terms is good, missing only a few variations.

Distinctiveness Conflict Risk

Clear niche — pre-placement receptacle verification/preparation — that is distinguishable from sibling skills like object search or placement itself. Not 5 because it could mildly overlap with a general 'place object' skill; not 3 because the preparatory-verification framing is distinctly scoped.