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

Annotations already declare readOnlyHint and openWorldHint, covering safety and external access. The description adds only that the content is 'public' and includes body paragraphs, but does not disclose auth needs, rate limits, or error behavior beyond what annotations imply.

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?

Two tightly written sentences: the first defines the tool's purpose, the second provides routing guidance. No filler or redundancy, and the purpose is front-loaded.

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?

Given the simple one-param read-only tool, an output schema that covers return values, and annotations covering safety, the description is complete enough for correct selection and invocation. It states what is fetched, from where, and how to find URLs if needed.

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 description coverage is 100%, so the single url parameter is fully documented in the schema. The description reinforces 'canonical url' but adds no syntax, format, or validation details beyond the schema.

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 ('Fetch') and resource ('public Game Rant article details and body paragraphs') from a canonical URL. It also distinguishes itself from siblings by naming the tools used for discovery, feeds, and section browsing.

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?

Explicitly routes the agent: use gamerant_headlines for discovery, gamerant_news for the general feed, and gamerant_sections for browsing. This makes it clear that this tool is for fetching a known article URL rather than finding one.

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