Conciseness

The body is dense imperative rules, commands, and minimal before/after snippets; it never explains concepts Claude already knows (no TypeScript tutorials, no rationale padding). The only prose is one short 'why' sentence in the intro, which earns its place; this fits the 'every token earns its place' anchor rather than the score-4 'minor trimming needed' anchor.

Actionability

Guidance is fully executable: a real scanner command with variants (`bun .agents/skills/nullable-new-params/scripts/find-new-optional-params.ts origin/main...HEAD`, `--cached`), concrete Before/After type and parameter examples, explicit caller patterns (`field: null`, `maybeValue ?? null`), a boundary conversion (`const internal = publicValue ?? null`), and a build command (`bunx turbo run make --filter='<package-name>'`). The referenced script exists in the bundle and is a working scanner, so nothing is pseudocode.

Workflow Clarity

The 7-step workflow (scan → classify → refactor → update callers → update implementation → public compat → verify) has an explicit validation loop ("Run the scanner again until only intentional public API exceptions remain"), a verification command, and a closing review checklist — matching the anchor requiring feedback loops and checklists. Not the score-4 anchor, since no checkpoint is missing.

Progressive Disclosure

Sections (Rule, Workflow, Review checklist) are well organized, everything inline is short and needed up front, and the single bundle file (scripts/find-new-optional-params.ts) is real, referenced one level deep, and demonstrated with usage variants. There is no content that belongs in a separate file and no nested references, so it fits the clear-overview/one-level-deep anchor.

Specificity

The description lists multiple concrete actions with comprehensive coverage of the niche: "Fix newly added optional parameters, optional React props, and optional type/interface members", "converting internal APIs to required nullable values and updating call sites", plus the exported/documented public-API exception. It matches the anchor for multiple specific concrete actions rather than the score-4 anchor, which expects minor coverage gaps.

Completeness

It explicitly answers both what (fix/convert/update call sites) and when ("Use when a PR, review, or user asks to forbid new `foo?: T` / `param?: T` additions...") with concrete trigger phrases, matching the score-5 anchor exactly rather than the score-4 anchor where the 'when' could be more specific.

Trigger Term Quality

Natural trigger phrasing is well covered with synonyms: "optional parameters", "optional React props", "optional type/interface members", "nullable", "PR, review", and the literal diff syntax "`foo?: T` / `param?: T`" a reviewer would actually quote. This exceeds the score-4 anchor (a few natural terms missing) and approaches the domain-appropriate equivalent of the comprehensive example.

Distinctiveness Conflict Risk

It carves a clear niche — new-optional-member hygiene in Remotion monorepo diffs with a public-API exception — with distinct triggers unlikely to fire for other skills. The score-4 anchor (minor overlap with closely related skills) is not met; even a general TypeScript linting skill would not collide with these triggers.