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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety is covered. The description adds a genuinely useful behavioral detail beyond them: subscriber-only stories return 403 rather than partial text, which tells the agent how failures manifest. Return format is not described, but an output schema exists to carry that.

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?

Three short sentences, front-loaded with the core action and scope, with no redundant or filler text. Every sentence carries either purpose, error behavior, or routing.

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?

With annotations covering the safety profile and an output schema covering return shape, the description supplies exactly the missing pieces: what is fetched, the subscriber-paywall failure mode, and how to obtain a valid URL. Nothing needed to invoke it correctly is absent.

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 url is already documented as 'Canonical GQ story URL'. The description's 'canonical story url' restates the schema rather than adding format, example, or constraint detail, so the baseline 3 is appropriate.

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 GQ article metadata and body paragraphs) plus the input scope (canonical story url). It also differentiates from siblings by naming gq_headlines and gq_news as discovery alternatives, so an agent can tell it apart without opening a schema.

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 gq_headlines to find stories or gq_news for the general feed, implying this tool is for fetching once a canonical URL is known. The subscriber-only 403 note sets a clear boundary on when the tool will fail to serve content.

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