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

Annotations declare readOnlyHint=true and openWorldHint=true, covering the safety profile. The description adds that it returns 'public metadata and body paragraphs,' which clarifies scope but does not disclose behavioral details like rate limits, authentication, or error handling.

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 a single, terse sentence that front-loads the resource and content. It contains no redundant or wasted words.

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 safety and an output schema covering return values, the description's main gap is the lack of input parameter detail and usage guidance. Given the tool's simplicity, it is minimally adequate but misses opportunities to fully orient the agent.

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?

The input schema has a single required 'url' parameter with no description (0% coverage). The tool description does not mention this parameter or its expected format, adding no meaning beyond the schema's type declaration.

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 identifies the resource (Guardian article) and specifies the content returned (public metadata and body paragraphs), distinguishing it from sibling tools like guardian_headlines or guardian_author. However, it lacks an explicit action verb like 'retrieve' or 'fetch', leaving the operation implicit.

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?

No guidance is provided on when to use this tool versus alternatives such as guardian_headlines, guardian_author, or guardian_topic. The implied use case (fetching full article content by URL) is left for the agent to infer.

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