Conciseness

The body is lean and assumes Claude's competence — it never explains what cookies, IndexedDB, or service workers are, and every line earns its place ("Record origin, scope, domain, path, expiry, and key names before mutating state"). The only mild redundancy (restating the orchestrator gate) is load-bearing routing context, so it stays at the efficient anchor rather than the padded 2.

Actionability

For an instruction-only investigation skill the guidance is concrete and specific: it names exact surfaces and attributes to inspect, prescribes "Compare clean-state and mutated-state runs with one variable changed at a time", and gives a precise reduction pattern ("initial page or login -> state persisted -> subsequent request or render branch -> resulting capability"). The scoring note explicitly does not penalize absence of code when guidance is this actionable.

Workflow Clarity

A clear sequenced workflow (Quick Start 1–5 plus Map → Tie → Reduce) with verification checkpoints — "Compare clean-state and mutated-state runs with one variable changed at a time" and "Reproduce the smallest stateful sequence that reaches the decisive branch" — plus a "What To Preserve" checklist. This is a read-mostly inspection task, so the destructive/batch feedback-loop cap at 2 does not apply.

Progressive Disclosure

SKILL.md is a concise overview with a clearly signaled one-level-deep reference ("Load `references/browser-persistence.md` for the browser-state checklist, service-worker checklist, and evidence packaging"), and that reference file exists and is self-contained without further nesting. Content is appropriately split and easy to navigate.

Specificity

Lists multiple concrete persistence surfaces ("browser cookies, localStorage, sessionStorage, IndexedDB, Cache Storage, service workers, offline caches") and concrete actions ("inspect", "replay", "explain", "trace"), matching the anchor for multiple specific concrete actions rather than the partial coverage at 2.

Completeness

Explicitly states what ("CTF-sandbox workflow for browser cookies, localStorage, ... client-side session persistence") and when ("Use when the user asks to inspect browser state, replay cached auth or session behavior, explain why a page behaves differently after load, or trace how stored client state changes requests"), satisfying both halves with an explicit trigger clause.

Trigger Term Quality

Natural phrases a user would say are well covered ("inspect browser state", "explain why a page behaves differently after load", "trace how stored client state changes requests, rendering, or access"), with domain-appropriate technical terms for the CTF target audience. Not a 2 because the triggers go beyond a single keyword to several natural user phrasings.

Distinctiveness Conflict Risk

A clear niche (browser-held client state within CTF-sandbox) with a hard gate ("Use only after `$ctf-sandbox-orchestrator` has already established sandbox assumptions and routed here"), making conflict with other skills unlikely.