Mostly efficient — the principles and template each earn their place — but the inline template guidance repeats the core principles (e.g. "Phrase as status, not actions" restates principle 1 "State, not instructions"), so it could be tightened. Not score 3 because of that redundancy; not score 1 because it does not explain concepts Claude already knows and is not padded with filler.

Provides a concrete 6-step procedure, a complete copy-paste output template, specific file-path conventions ("$TMPDIR/handoff-<random-8-chars>.md"), and a ready-to-paste prompt for the fresh agent. Not score 2 because the guidance is specific and directly executable rather than pseudocode or abstract.

The procedure is a clearly sequenced, complete set of steps (read config → read prior handoff → handle args → fill template → output → save). Not score 2 because the sequence is explicit and complete; validation checkpoints are not required here since handoff writing is neither destructive nor batch, the contexts the rubric flags for capping at 2.

No bundle files exist and none are needed; the skill is a single self-contained file organized into well-labeled sections (Core Principles, Procedure, Output Format, File Output) with no nested references. Not score 2 because organization is clear and the inline template legitimately belongs inline rather than being split out.

Names multiple concrete actions — "Compact the current conversation into a single, detailed handoff message", "output in a code block so it can be copy-pasted into a fresh agent session" — rather than vague language. Not score 2 because it goes beyond naming a domain to list specific concrete actions; not below because none of it is abstract.

Explicitly answers both what ("Compact the current conversation into a single, detailed handoff message...") and when via an explicit "Use when..." clause. Not score 2 because the trigger guidance is explicit, not merely implied.

The "Use when hitting context limits, switching focus, ending a work session" clause uses terms a user would naturally say when needing this skill. Not score 2 because coverage spans several natural phrasings; "partitioning a task across fresh contexts" is slightly technical but the first three triggers are clearly user-spoken.

The handoff niche is distinct and the triggers (context limits, ending a session, partitioning across contexts) are specific enough to avoid firing for unrelated skills. Not score 2 because it is not a generic capability that overlaps with other skills.