Conciseness

The body is lean and assumes Claude's competence: no explanations of what Unreal, UMG, or packaging are; every section carries curated non-obvious knowledge (the 26-of-61-pages coverage caveat, the ApiKey/BeginPlay ordering trap, the one-archive-per-engine-version silent-mismatch warning). Legacy engine versions (4.27/5.0/5.1, v1.3.0 Dec 2022) are properly quarantined in the gate table rather than scattered, so the time-sensitive version information does not pollute the main path. Matches the level-5 anchor "every token earns its place"; there is no over-explanation to trim that would justify 4.

Actionability

Guidance is fully executable: a copy-paste bash one-liner for engine-version detection ("find . -maxdepth 2 -name \"*.uproject\" -exec sh -c 'echo == $1; grep -m1 EngineAssociation $1' ..."), an exact URL-rewriting convention with a worked example ("take the page URL, drop the trailing /, add .md"), concrete release-asset names (StreamChat-5.7.zip, StreamChat-5.8.zip), specific header paths (Plugins/StreamChat/Source/StreamChat*/Public/**.h), and named functions with signature comparisons (BanUserBP vs BanUser TOptional variants). Matches level 5 "copy-paste ready code or commands; specific examples cover the common cases".

Workflow Clarity

The multi-step process is explicitly sequenced — Step 0 gates (engine version, feature support, C++ vs Blueprint) resolved "before any code", then Step 1 request classification, then Step 2 docs lookup — with validation checkpoints (the three gates) and error-recovery feedback loops (source-of-truth ladder with "stop at the first rung", the live-index fallback when the feature is not in docs-map.md, the no-Unreal-tab drop to rung 2, and the "at most 3 fetches" cap). This matches the level-5 anchor; the workflow is read/lookup orchestration, not destructive or batch, so the validation-cap rule does not apply.

Progressive Disclosure

The structure itself is textbook level 5: a concise orchestrator overview, one-level-deep references, a "What this skill carries" table describing each file's role, and task-typed routing (setup.md for integrate, widgets.md for UI, platforms.md for packaging). However, none of the five referenced bundle files (RULES.md, setup.md, widgets.md, platforms.md, docs-map.md) actually exist in the bundle — no references/, scripts/, or assets/ directories are present — so the navigation the body promises cannot be verified and every link is broken as shipped. This lands at 4 ("good structure; minor organization gaps") rather than 5, and not 3 because the signaling and routing within SKILL.md itself are clear and well-organized.

Specificity

The description lists multiple concrete actions — "Build, integrate, and answer how-to questions for Stream Chat", "plugin install per engine version, StreamChatClientComponent wiring on the HUD, ConnectUser and tokens, channels and messages, the shipped WBP_* chat widgets, theming, cooking, and iOS / Android / desktop packaging" — covering the full task surface comprehensively in third-person voice, matching the level-5 anchor.

Completeness

Both questions are answered explicitly: "what" via "Build, integrate, and answer how-to questions for Stream Chat in Unreal Engine games and apps" and "when" via "Use for Unreal Engine / UE5 / C++ / Blueprint / UMG project work" plus an explicit "Triggers on ..." clause with concrete trigger phrases. It also scopes the boundary ("Chat only - there is no Stream Video or Feeds SDK for Unreal"), which the level-4 anchor lacks.

Trigger Term Quality

"Triggers on unreal, unreal engine, ue5, ue 5.7, ue 5.8, .uproject, .uplugin, Build.cs, umg, blueprint, widget blueprint, StreamChat plugin, UStreamChatClientComponent, UChatChannel, FChannelProperties, WBP_TeamChat, in-game chat, game chat" — comprehensive coverage including synonyms, file extensions, class names, and natural user phrases like "in-game chat". It is not below 5 because no common variation is missing; not above since 5 is the maximum.

Distinctiveness Conflict Risk

The Stream-Chat-in-Unreal niche is clear, but generic triggers ("unreal", "umg", "blueprint", "Build.cs") and the phrase "Use for Unreal Engine / UE5 / C++ / Blueprint / UMG project work" would fire for any Unreal Engine project, even one with no chat intent — minor overlap risk with a hypothetical general-Unreal skill, fitting the level-4 anchor "mostly distinct; minor overlap risk". Not 5 because those broad triggers go beyond the skill's actual Stream Chat scope; not 3 because the domain itself is a well-defined niche with many Stream-specific trigger terms.