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 that the article is 'public', implying no authentication is required, but says nothing about paywalls, rate limits, or failure behavior on invalid URLs.

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 tight sentences: the payload is front-loaded and the input requirement follows. No filler, and every clause carries information.

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 an output schema present, return values need no further explanation, and the annotations carry the safety profile. For a one-parameter read tool the description is nearly complete; the only untold piece is how the agent should obtain a valid URL in the first place.

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% and the schema already labels the parameter as a canonical article URL. The description adds the 'HTTPS' constraint, which is a genuine format requirement not present in the schema's wording.

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 ('Retrieve') and resource (a Sky Sports article) and even enumerates the payload: title, metadata, body paragraphs. It clearly distinguishes itself from skysports_headlines/news/sections by naming the article resource, though it never explicitly names those siblings.

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?

The second sentence implies the caller must already hold a canonical URL, which hints that URL discovery happens elsewhere (e.g. skysports_headlines or skysports_news). However, it never states when to use this tool versus those lookups or warns that the URL cannot be a search query or homepage.

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