Conciseness

The body is token-efficient: decision tables ('| Shape | Use for |', trigger-config/handler-payload tables), concrete domain facts Claude cannot know, and no padding explaining general concepts. The 0.25 deprecation story is correctly confined to deprecation-style guidance rather than loose time-sensitive claims, but it is repeated in roughly five places (the primitives intro, the registration table, the trigger-shapes section, the Rust comment, and the advanced patterns section), and 'When to Use' restates the description — minor trimmable content matching the 'minor instances of over-explanation' anchor (4).

Actionability

The TypeScript and Python examples are complete and copy-paste ready (register_worker, registerFunction, sync trigger, enqueue action, HTTP registerTrigger), backed by a concrete worker manifest, exact config shapes, and CLI commands ('iii trigger -n <namespace> <function>', 'compose::add worker=<name>@<version>'). The Rust block, however, uses top-level 'let' and the '?' operator outside any function, so it will not compile standalone — a minor gap in one of three language examples, matching 'mostly executable; concrete code with minor gaps' (4) rather than fully executable (5).

Workflow Clarity

This is a reference-style skill rather than a multi-step workflow, with no destructive or batch operations (so no validation cap applies). Task-to-tool tables ('Create your own worker | Write SDK code that calls registerWorker...') and explicit decision guidance ('Use enqueue for work that must complete with retries', 'Register local handlers when you control the implementation') make each path unambiguous, but there is no sequenced multi-step flow with checkpoints — matching 'clear sequence with most checkpoints present; minor gaps' (4) rather than the explicit validation/feedback-loop anchor (5).

Progressive Disclosure

No bundle files exist (references/, scripts/, assets/ are absent), and the body's references are one-level-deep and clearly signaled — the Boundaries section maps each neighboring skill (iii-observe, iii-engine-config, iii-sdk-reference, iii-architecture-patterns, iii-error-handling) to its topic. Sections are well organized, though ~100 lines of three-language code examples could plausibly live in per-language reference files — 'good structure; minor organization gaps' (4) rather than the cleanly split anchor (5).

Specificity

The description enumerates many distinct concrete actions — 'registering iii functions, binding triggers, observing functions, selecting sync/void/enqueue invocation, creating workers, inspecting the live worker registry, installing registry workers, authoring event sources, moving channel data, or adapting external HTTP functions' — giving comprehensive coverage of the skill's primitive surface. It clearly matches the 'multiple specific concrete actions; comprehensive coverage' anchor rather than the minor-gaps anchor below it.

Completeness

The 'when' is fully explicit ('Use when registering iii functions...') with concrete trigger activities, but the 'what' is only implicit — the enumerated activities imply capabilities without ever stating what iii is or what the skill provides. This matches the anchor 'both what and when; one could be more explicit' (4), not the explicit-both anchor (5).

Trigger Term Quality

Good natural keyword coverage via verb phrases users would say ('creating workers', 'binding triggers', 'registering iii functions', 'selecting sync/void/enqueue invocation'), but common variations and concrete artifacts are missing (e.g., cron, webhooks, queues, workers.iii.dev, worker-compose.yaml). This sits between 'good keyword coverage; a few natural terms missing' (4) and 'comprehensive coverage including synonyms' (5), closer to the former.

Distinctiveness Conflict Risk

The 'iii' prefix and primitive-specific terminology ('sync/void/enqueue invocation', 'live worker registry', 'channel data') establish a clear niche with minimal conflict against unrelated skills. However, 'observing functions' overlaps the sibling iii-observe skill's core territory, which the body itself defers to iii-observe — minor overlap risk with a closely related skill (4) rather than minimal risk (5).