Conciseness

The ~85-line body is telegraphic and operational throughout; nothing explains concepts Claude already knows, and even asides earn their place (e.g., "the hub may not be the default one" justifies "give that address, never one of your own"). "Python 3.9+, standard library only" is a durable runtime requirement, not time-sensitive deprecation info, so it does not warrant the level-4 trim.

Actionability

Every step is a copy-paste-ready command with exact flags ("messages --from claude --json", "save --session ID --messages 1,3", "--exclude PATH" repeatable, "submit <task folder> --json"), and the subcommands and flags were verified to exist in scripts/capture.py. Placeholders like <skill> and ID are data-dependent arguments, with the <skill> path convention explained up front.

Workflow Clarity

Save → show summary → consent gate → submit → follow-up is clearly sequenced with explicit checkpoints (secret detection: "stop and tell the user; do not work around it"; "Ask first, every time; say what will be uploaded") and a feedback loop mapping recoverable errors to actions ("not signed in" → login; day's limit → try later; task too large → re-save with --exclude). The one risky operation, uploading, is explicitly gated, so no cap applies.

Progressive Disclosure

Three well-labeled sections (Save, Submit, Follow it) match the three operations; the single bundle file scripts/capture.py is signaled up front and does the work, and nothing inlined belongs in a separate reference (the stage list and error catalogue are short and load-bearing). References are one level deep and verified against the actual bundle.

Specificity

Lists four concrete actions covering the skill's full surface — "Save a finished Claude Code or Codex session as a Harbor task", "submit it to Env Hub", "check how a submitted task is going", "list their environments" — so it matches the comprehensive-coverage anchor rather than the minor-gaps level below, since no missing action can be named.

Completeness

Explicitly answers both questions: the "what" (save a session as a Harbor task and submit it to Env Hub, which writes the verifier and reference solution) and an explicit "Use when..." clause with concrete trigger phrases — a structural match to the level-5 anchor example. Level 4 requires a less-explicit "when", which does not apply here.

Trigger Term Quality

Includes verbatim quoted trigger phrases users would naturally say ("save this session as a Harbor task", "turn this into a Harbor task or environment", "submit this to Env Hub", "保存为 Harbor 任务") plus follow-up triggers for status and listing, covering synonyms across two languages. Not score 4, because no natural term for this niche is identifiable as missing.

Distinctiveness Conflict Risk

Triggers on unique product vocabulary ("Harbor task", "Env Hub") that no other skill would claim, giving it a clear niche with minimal conflict risk.