Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the safety profile is covered structurally. The description adds useful content context ('not a tutorial', production-ready code) but nothing about result size, pagination, or ordering — modest value on top of the annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Purpose leads the description, followed by the value proposition and then the category inventory. The framework enumeration (Swift Charts, SpriteKit, Vision, AVFoundation, StoreKit 2, NavigationStack, AWS CDK, Hono, Cognito, DynamoDB) is longer than needed for tool selection and could be trimmed.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a read-only, zero-required-parameter listing tool with no output schema, the description is adequate about scope. It never indicates what identifying fields a returned skill carries (name/id) — information an agent needs to chain into getSkill — leaving a gap in the retrieval workflow.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100% and the single parameter is a self-documenting enum with a default, so the baseline is 3. The description's category list ('animations, charts, UI components, full-stack modules') loosely enriches the enum values but does not map them explicitly or explain what 'module' contains beyond examples like auth, camera, subscriptions.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource: 'List production-ready SwiftUI skills', and adds that each item is a complete copy-paste-ready implementation. It does not, however, differentiate itself from the sibling searchSkills or explain the list-vs-search distinction.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

Browsing a catalog is implied by 'List' and the category filter, but there is no explicit guidance on when to use this versus searchSkills, or a note that getSkill is the follow-up for fetching a single item. Usage must be inferred from the tool name alone.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.