Conciseness

The body is lean and code-first — a compact Pattern Map table, one-sentence framing per pattern, and a terse Selection Rules list — with only minor trims available: the 'When to Use' section repeats the opening paragraph and frontmatter, and version-sensitive notes ('deprecated in 0.25', 'since 0.25') sit inline rather than in a deprecated/old-patterns section. This is efficient with minor over-explanation, not the every-token-earns-its-place level of the top anchor.

Actionability

Mostly executable, copy-paste-ready TypeScript and Python examples with real imports and signatures ('registerWorker', 'TriggerAction.Enqueue', 'iii.observe(...)', 'registerTrigger') plus concrete selection rules mapping each requirement to a mechanism. Minor gaps keep it below fully-executable: the Rust snippet is a fragment without worker registration, and 'publish' and 'stream::send' are invoked without being defined.

Workflow Clarity

The selection workflow is clear and well-sequenced: map the requirement in the Pattern Map, apply the Selection Rules to choose a composition mechanism, then implement from the shown shape; failure-mode handling appears in the observer section (echo-loop filtering, 'max_observe_depth' cap). No destructive or batch operations apply, but validation guidance is thin — testing is a single bullet ('Keep each function small enough to test independently') with no verification steps for composed architectures, which fits anchor 4 rather than 5.

Progressive Disclosure

No bundle files exist, so the single body is the whole skill; it is well-sectioned with clear headers, and the Boundaries section cleanly signals where deeper detail lives (iii-core-primitives, iii-observe, iii-engine-config, iii-sdk-reference) as one-level-deep references. Minor organization gaps — the three-language variants are all inlined in one ~250-line file rather than the overview pointing at split reference files — keep it at good-structure rather than the ideal split.

Specificity

Names the concrete action 'composing iii primitives into backend architectures' and enumerates seven specific pattern types ('durable workflows, reactive backends, observer side effects, agentic pipelines, event-driven CQRS, effect pipelines, and trigger-transform-action automation'), listing several specific items with only a minor gap: no verb states what the skill actually produces for them (code, guidance, design).

Completeness

The 'when' is explicit and concrete ('Use when composing iii primitives into backend architectures'), but the 'what' is never stated — whether the skill provides patterns, code, or design guidance is only implied by the enumerated architectures, since the single sentence is phrased entirely as a trigger. It sits above the pure trigger-only anchor because the enumeration explicitly delimits scope, but below anchor 4, which requires both 'what' and 'when' to be stated.

Trigger Term Quality

Natural phrases a user building on iii would plausibly say ('durable workflows', 'event-driven CQRS', 'reactive backends', 'agentic pipelines') give good keyword coverage, but common synonyms and variations ('workflow orchestration', 'event sourcing', 'pub/sub', 'webhook automation') are missing, so it does not reach the comprehensive synonym-level coverage of the top anchor.

Distinctiveness Conflict Risk

'iii primitives', 'effect pipelines', and 'event-driven CQRS' carve a clear niche that would not trigger generic skills, but the listed trigger 'observer side effects' overlaps with the sibling iii-observe skill's territory, creating minor overlap risk with a closely related skill.