Conciseness

The body is dense and assumes Claude's competence (no library or concept explainers), but the W&B deferral boundary is stated three times (intro, §2, §5) and the "example, not a cookbook API" hedge pattern repeats. These are minor instances of over-explanation that could be trimmed, fitting the 4 anchor; the absence of any padded concept explanation rules out 3.

Actionability

Concrete specifics abound: a named stack table (Blueprint, TanStack Query, FastAPI, Playwright), real cookbook file paths (rollout_logging.py, train.py, *_rollout_summaries.jsonl), an exact route pattern, a compound key tuple, and pixel-level accessibility targets. For an instruction-only skill this is mostly executable guidance, but nothing is copy-paste ready (no adapter route or query-key sketch), keeping it just below the 5 anchor and well above the pseudocode-level 3 anchor.

Workflow Clarity

The seven numbered sections form a coherent build sequence with validation at both ends: acceptance tests agreed in §1 ("acceptance tests" in the implementation brief) and a real browser verification checklist in §7 ("Test a production build as well as development mode", "State which checks were actually run"). It misses the 5 anchor only because no explicit fix-and-re-verify feedback loop is stated for failed checks; this is not a destructive/batch skill so the workflow-clarity cap does not apply.

Progressive Disclosure

The body is a well-organized overview with seven clear sections, and the detailed acceptance procedures are appropriately split into references/browser-checks.md, which exists and is signaled as "[the browser acceptance checklist](references/browser-checks.md)" exactly where needed (§7). The single reference is one level deep and clearly navigable, matching the 5 anchor; there are no organization gaps that would justify 4.

Specificity

"Build or improve UIs for browsing, inspecting, and comparing LLM rollout content, messages, tool calls, and transcripts across models and checkpoints" lists multiple concrete actions (build, improve, browse, inspect, compare) over a comprehensively enumerated object domain. Matches the 5 anchor rather than 4 because action and object coverage is complete, not 'minor gaps'.

Completeness

The first sentence explicitly states what the skill does, and "Use when the user asks for a rollout viewer, trajectory inspector, or accessible transcript diffs" explicitly states when with concrete trigger phrases. This mirrors the 5 anchor's structure; the 'when' is fully explicit, so 4 does not fit.

Trigger Term Quality

"Use when the user asks for a rollout viewer, trajectory inspector, or accessible transcript diffs" provides strong natural trigger phrases for this domain. Not 5 because common synonyms such as "rollout browser" or "compare rollouts across models" are absent; not 3 because the core phrases users would actually say are present and explicit.

Distinctiveness Conflict Risk

The niche (LLM rollout/trajectory evidence browsers) is distinct, and "Defer metric-based data and dashboards to Weights & Biases" actively disambiguates from generic dashboard/visualization skills. Clear niche with distinct triggers and minimal conflict risk, matching the 5 anchor.