Conciseness

The ~40-line body is lean and assumes Claude's competence: two commands, an argument list, an output-field list, and a one-line uv fallback note ("If `uv` is not installed or `pyproject.toml` is not found, replace `uv run python` with `python`"). No concept explanations or padding appear, matching the 5 anchor ("every token earns its place"). Not a 4 because there are no instances of over-explanation to trim.

Actionability

The instructions give fully executable, copy-paste-ready commands ("uv run python scripts/options.py SYMBOL --expiries", "uv run python scripts/options.py SYMBOL --expiry YYYY-MM-DD") with concrete ticker examples ("e.g., AAPL, SPY, TSLA") and an explicit enumeration of the returned JSON fields. This matches the 5 anchor; not a 4 because there are no gaps — both invocation modes and expected output are fully specified.

Workflow Clarity

The two-step sequence is explicit and unambiguous: "First, get available expiration dates" then "Then fetch the chain for a specific expiry", so the expiry-selection step itself validates the date used in the second call. This is a simple read-only skill (~45 lines) with no destructive or batch operations, so the validation cap does not apply and the simple-skill exception holds — matching the 5 anchor for unambiguous single-purpose workflows.

Progressive Disclosure

The body is under 50 lines, well-organized into clear sections (Instructions, Arguments, Output, Dependencies, Timezone), and its only bundle path — `scripts/options.py` — exists in the bundle and matches the documented CLI (symbol, --expiries, --expiry), including the generated_at/data_delay output the Timezone section requires. Per the rubric's simple-skill guidance this matches the 5 anchor with no nested or buried references.

Specificity

"Get option chain data including calls and puts with strikes, bids, asks, volume, open interest, and implied volatility" enumerates the concrete data returned in detail, but the description names a single action ("Get") rather than several specific actions, so it sits between the 4 anchor ("several specific actions, minor gaps") and the 5 anchor ("multiple specific concrete actions; comprehensive"). It is not a 3 because the data-field enumeration is far more concrete than naming the domain plus 1-2 actions.

Completeness

The description explicitly answers both questions: what it does ("Get option chain data including calls and puts with strikes, bids, asks, volume, open interest, and implied volatility") and when to use it ("Use when user asks about options, option prices, calls, puts, or option chain for a specific expiration date") with concrete trigger phrases — a direct match for the 5 anchor. Not a 4, since the 'when' clause is fully explicit rather than improvable.

Trigger Term Quality

"Use when user asks about options, option prices, calls, puts, or option chain" covers the natural phrases users would say, matching the 4 anchor ("good keyword coverage; a few natural terms missing"). It falls short of 5 because common variations like "implied volatility", "IV", "expiries", or "option Greeks" are absent as triggers, and above 3 because far more than 1-2 relevant keywords are present.

Distinctiveness Conflict Risk

The triggers ("options, option prices, calls, puts, option chain") name a clear niche with distinct trigger vocabulary and minimal conflict risk with other skills, matching the 5 anchor. Not a 4, because even closely related trading skills (e.g., a stock-quote skill) would not naturally claim these option-specific phrases; not lower because the scope is unambiguous.