Conciseness

The body is directive-dense with almost no explanation of concepts Claude already knows — every line is a domain-specific rule, file name, or API constraint. Minor trimmable redundancy exists: the trailing paragraph of 'Interaction Boundaries' restates the preceding bullets nearly verbatim ('For casual conversation, keep the response brief. Start the detailed workflow only for a concrete micro-app task...'), and the Acceptance Checklist re-summaries earlier sections. This fits anchor 4 (efficient with minor instances that could be trimmed) rather than anchor 5's every-token-earns-its-place, and is well above anchor 3's noticeable unnecessary explanation.

Actionability

Guidance is copy-paste concrete throughout: exact file names and manifest fields ('app.json', 'entry: "index.html"', 'metadata.form_draft: { "enabled": true, "storage": "sessionStorage" }'), exact tool calls ('read_skills(skill_names=[...], project_id=...)'), a complete executable createTopicAndSend code example, and precise error-handling rules ('Every catch and error callback must call console.error with operation context'). For an instruction-only skill this matches anchor 5 (fully executable, specific examples covering common cases); per the rubric's scoring note, absence of more code is not penalized when guidance is this actionable.

Workflow Clarity

The 10-step Development Workflow is clearly sequenced with explicit checkpoints: approval gate ('Do not write business files or change the schema before approval'), exact plan schema requirements (step 7), a memory-update step ('call update_html_app_memory once'), and a self-check step, capped by a full Acceptance Checklist. Destructive and batch operations have explicit validation loops ('Query and describe the scope of real data before deletion, then obtain explicit confirmation before using confirm_delete=true' and the logged-out login round-trip verification for form drafts), matching anchor 5's explicit validation, feedback loops, and checklists.

Progressive Disclosure

No bundle files exist (no references/, scripts/, or assets/), so everything is inline in one well-sectioned file with clear, navigable headers (Scope, AI Execution Routing, Development Workflow, Files and Manifest, Anonymous Access, MagicBase, Companion business skills, Agent Messages, UI, Acceptance Checklist). Structure is good and content is mostly appropriately placed, matching anchor 4; it falls short of anchor 5 only because ~125 lines of dense contract rules (e.g., the full form-draft lifecycle and MagicBase permission rules) are inlined where a leaner overview with reference files could split them, and short of anchor 3 because nothing is buried and sections are clearly signaled.

Specificity

Enumerates concrete scope items ('manifest and memory files, MagicBase boundaries, companion business skills, runtime Agent messaging, UI constraints, and validation rules') with several specific deliverables, though the governing verbs ('developing and maintaining') stay generic. This fits anchor 4 (several specific items, minor coverage gaps) rather than 5, which would require multiple fully concrete actions; it is well above anchor 3, which covers only 1-2 concrete actions.

Completeness

Explicitly answers both questions: 'when' via the opening trigger clause 'Use for developing and maintaining a published SuperMagic HTML micro-app with the built-in micro-app.agent', and 'what' via the enumerated list of what the skill defines. It even adds a concrete negative trigger ('Do not use it as the generic architecture guide... use html-app-architect for that scenario'), matching anchor 5's clear and explicit what-and-when with concrete trigger phrases; anchor 4 would require the 'when' to be less explicit than it is.

Trigger Term Quality

Contains strong natural domain terms a user in this environment would say: 'published SuperMagic HTML micro-app', 'micro-app.agent', 'MagicBase', 'manifest'. Good coverage but missing common variations or synonyms (e.g., 'create/build a micro-app', 'publish'), so anchor 4 fits better than the comprehensive synonym-and-extension coverage of anchor 5, and clearly above the sparse keyword coverage of anchor 3.

Distinctiveness Conflict Risk

Occupies a clear niche ('published SuperMagic HTML micro-app', 'MagicBase', 'micro-app.agent') and explicitly disambiguates against the nearest competing skill ('use html-app-architect for that scenario'), giving minimal conflict risk. This matches anchor 5 (clear niche with distinct triggers); anchor 4 would imply residual overlap with closely related skills that the explicit boundary clause already resolves.