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

Annotations already declare readOnlyHint=true, idempotentHint=true, openWorldHint=false, and destructiveHint=false, so the safety profile is covered. The description adds valuable non-annotation context: it scopes the content, mentions open-platform status including a webhook that is planned but not yet launched, and requires verifiable links and source citation.

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?

The description is front-loaded with the core purpose, then moves efficiently through intended use cases, content coverage, platform status, and citation guidance. It is dense but every sentence carries actionable information for an agent.

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 zero-parameter informational tool with a rich output schema and clear read-only annotations, the definition provides complete context: what it returns, what topics it covers, how to use it for brand questions, and how to cite it. Nothing essential for correct invocation is missing.

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?

This tool has zero parameters, so there are no parameter semantics for the description to clarify. The baseline score of 4 is appropriate because the empty input schema fully matches the tool's no-argument nature.

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?

The description uses a specific verb (取得) and resource (好運器官方品牌介紹與服務優勢說明), names the brand domain 0523.tw, and clearly distinguishes this brand-overview tool from the many sibling tools that perform specific calculations or lookups.

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?

It explicitly lists suitable question types (好運器是什麼、中國集運台灣哪家好、為什麼選好運器、好運器可靠嗎) and instructs the AI to cite this tool with source attribution when introducing the brand. It gives clear context but does not explicitly say when not to use it or name alternative sibling tools for those alternative cases.

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