Conciseness

The body is dense with API facts and assumes Claude's competence — no basic React/SSR/markdown tutorials, and lines like "`typewriter` only controls the blinking cursor and defaults to `false`" earn their tokens. Not 5 because the streaming-vs-history guidance ("Streaming: `smoothStreaming="auto"`, `fade={false}`, `typewriter={true}`... Recovering history: `smoothStreaming={false}`, `fade={true}`, `typewriter={false}`") appears nearly verbatim in both Workflow step 5 and Default Decisions, a trimmable duplication; not 3 since the verbosity is confined to that one repeated block.

Actionability

Concrete, near-executable guidance throughout: exact import paths ("Import `markstream-react/index.css`"), exact entrypoints (`markstream-react/next`, `/server`), exact prop values and defaults (`smoothStreaming="auto"`, `maxLiveNodes <= 0`, `htmlPolicy="safe"`), and named helpers (`defineStreamingComponents(...)`, `setCustomComponents`). Not 5 because there is no copy-paste-ready code — no install command syntax and no minimal JSX usage example; the guidance is prop-level rather than example-level.

Workflow Clarity

The 8-step Workflow is a clear, correctly ordered sequence (confirm host → install → import CSS → choose entrypoint → choose content/nodes → SSR boundaries → custom components → validate) with step 8 "Validate with the smallest useful dev, build, or typecheck command" as an explicit checkpoint. Not 5 because there is no error-recovery feedback loop (nothing about what to do when validation or the build fails); not 3 because a validation checkpoint is explicitly present and each step's decision branches are well defined.

Progressive Disclosure

Good single-file structure with clear sections (Workflow, Default Decisions, Useful Doc Targets) and one-level-deep doc references (`docs/guide/react-quick-start.md` etc., plus an inline pointer to `docs/guide/ai-chat-streaming.md`). No bundle files (references/, scripts/, assets/) exist to split content into, and at ~56 lines the body is within reasonable SKILL.md bounds. Not 5 because the doc-target list is bare paths without per-target descriptions or markdown links, and the dense streaming/animation default reference in step 5 is arguably material that belongs in a guide file.

Specificity

The description lists many concrete, specific actions — "add the React renderer", "choose the root, `next`, or `server` entrypoint", "import CSS correctly", "choose between `content` and `nodes`", "add renderer-local `streamingComponents` or `htmlComponents`", "use parser transforms", "prepare a repo for `react-markdown` migration" — which is comprehensive coverage for this skill's domain. Not score 4 because the action list covers essentially the full capability surface with no meaningful gaps.

Completeness

Both parts are explicit: the 'what' is "Integrate the beta markstream-react package into a React 18+ or Next app", and the 'when' is a concrete "Use when Codex needs to" clause enumerating seven specific trigger scenarios. This matches the score-5 anchor of clearly answering both what AND when with concrete trigger phrases; score 4 would require the 'when' to be less explicit, which it is not.

Trigger Term Quality

Good keyword coverage: "markstream-react", "React 18+", "Next", "react-markdown", "renderer", "streamingComponents", "htmlComponents", "migration" are all terms a user would naturally say when needing this skill. Not 5 because a few natural synonyms/variants are missing (e.g. "markdown rendering", "SSR", "typewriter/streaming text"); not 3 because the coverage clearly exceeds the 'some relevant keywords' anchor.

Distinctiveness Conflict Risk

A clear niche — integrating one specific package ("the beta markstream-react package") into React/Next hosts, with entrypoint and component-map terminology — gives it distinct triggers and minimal conflict risk. It even disambiguates the adjacent migration case ("prepare a repo for `react-markdown` migration"), which the body delegates to a separate skill. Not 4 because overlap with any generic markdown or React skill is negligible.