Conciseness

Lean throughout with zero padding or explanation of concepts Claude already knows — every line is a directive carrying non-obvious knowledge ('TSX alone does not imply React', 'Use callbacks instead of Vue emits'). Matches anchor 5 ('every token earns its place').

Actionability

The core streaming case is copy-paste ready (complete Message TSX example), with exact commands for verification and concrete worker imports/Vite config. However worker wiring, MarkstreamVirtualTimeline, and instructions like 'disable pacing, batching, viewport priority, deferral and live windows explicitly' lack executable snippets — anchor 4 ('minor gaps'), not 5.

Workflow Clarity

Setup is a numbered 5-step sequence and the Verification section gives explicit commands (pnpm test:solid, test:smoke:solid-workers), but there are no feedback loops for error recovery and setup steps lack inline checkpoints. Anchor 4 ('most checkpoints present; minor validation gaps'), not 5.

Progressive Disclosure

The ~50-line body has well-organized sections (Setup, Streaming, Workers/SSR, Components, Verification) and no bundle files; all deep material (per-component/API tables, full guides) is delegated one level deep to clearly signaled references. Per the simple-skill guideline, this scores 5.

Specificity

Names the domain ('Integrate markstream-solid in SolidJS 1.9 or SolidStart apps') and enumerates concrete capabilities — 'Markdown streaming/restoration', 'emitted KaTeX/Mermaid workers', 'scoped components and translations', 'virtual timelines' — comprehensively covering every feature area in the skill body. It exceeds anchor 4 ('minor gaps in coverage').

Completeness

Explicitly answers both: what ('Integrate markstream-solid in SolidJS 1.9 or SolidStart apps') and when ('Use for reactive TSX, SSR and hydration, Markdown streaming/restoration, ...') with concrete trigger phrases. The when-clause is explicit and concrete, exceeding anchor 4's 'could be more explicit'.

Trigger Term Quality

Includes strong natural terms users would say ('SolidJS', 'SolidStart', 'SSR and hydration', 'KaTeX/Mermaid', 'TSX'), but misses common phrasings such as 'markdown rendering' or 'chat UI', and 'restoration' / 'emitted workers' lean technical. Matches anchor 4 ('a few natural terms missing') rather than the synonym-and-extension coverage of anchor 5.

Distinctiveness Conflict Risk

A clear niche (a specific library tied to SolidJS/SolidStart) with minimal conflict risk, but the unscoped trigger 'reactive TSX' could pull React/TSX requests — minor overlap with closely related skills, matching anchor 4 rather than anchor 5's minimal-conflict profile.