Conciseness

Efficient overall — nearly every sentence carries Stream-specific operational knowledge (beta vs stable version formats, docs-command stdout pitfalls, platform tie-break rules) rather than concepts Claude already knows. Not 5 because of minor trimmable material: the CLI capability list ('authenticating, onboarding a project (org, app, credentials), calling any API endpoint...') largely duplicates what 'getstream -h' prints, and the agents-app-is-Chat-and-Video point is stated twice ('A session's conversation is a Chat channel and its voice is a Video call, so the app around an agent is a Chat and Video app like any other' and later 'its Chat UI kit renders the session's conversation and its Video SDK holds the call').

Actionability

Copy-paste ready commands throughout: both install scripts with 'getstream --version' verification and expected output format, the guarded docs pattern 'd=$(getstream docs <id>) && ls "$d"', and concrete command patterns for every routing branch ('getstream skills <name>', 'getstream api', 'getstream docs list', 'getstream agents init --template'). The common cases (routing, skill install, doc lookup, CLI version issues) are each covered with specific, executable guidance.

Workflow Clarity

'First match wins' gives an explicit ordered decision procedure with tie-break rules ('A framework beats an OS'), validation checkpoints are present (version check after install, the update-and-recheck loop when a command is missing, stdout check before ls), and there is an ask-when-ambiguous fallback ('Genuinely ambiguous: ask'). No destructive or batch operations, so no validation cap applies.

Progressive Disclosure

Good structure: a lean overview plus a router whose whole job is disclosure — details are delegated to the platform skills it routes to, and scenario files are clearly signaled one level deep ('read integration-review.md together with the platform skill', 'read sendbird-data-migration.md'). Not 5 because none of the referenced .md files (integration-review.md, sendbird-data-migration.md, stream-agents.md) exist in this skill's bundle and no path or owning-skill is given for two of them, leaving navigation slightly uncertain.

Specificity

Enumerates multiple concrete actions — 'building or integrating Stream into web, iOS, Android, React Native, Flutter, Unity, or Unreal apps', 'building voice or text AI agents with Stream Agents', 'querying Stream data', 'running getstream CLI commands', 'looking up Stream SDK docs', 'migrating (from Sendbird, or Feeds v2 to v3)' — comprehensive coverage of the router's scope, matching the anchor-5 example's breadth. Not 4 because there is no noticeable gap: every major task category the body routes on is named.

Completeness

Explicitly answers both what ('Stream overview, CLI, and router for Chat, Video, Feeds, Moderation, and Agents... Routes to the right skill') and when ('Use for any Stream task:' followed by six concrete trigger phrases). Matches the anchor-5 pattern of a clear what plus an explicit 'Use when' clause with concrete triggers.

Trigger Term Quality

Comprehensive natural terms users would actually say: 'Stream', 'getstream CLI', 'Sendbird', 'Feeds v2 to v3', 'voice or text AI agents', 'Stream SDK docs', and all platform names (iOS, Android, React Native, Flutter, Unity, Unreal), including the getstream synonym. It exceeds the anchor-4 example ('PDF files, forms, document extraction') by covering synonyms and migration-specific phrasing.

Distinctiveness Conflict Risk

Clear niche (the Stream ecosystem) with distinct triggers; nothing here would fire for a non-Stream skill, and the overlap with the platform-specific skills it names is the router's intended behavior ('Routes to the right skill'), not a conflict. Far from the generic anchors at 1–3.