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

Annotations already declare readOnlyHint and openWorldHint, so safety is covered; the description adds that the content is public (no auth implied) and that it returns both story metadata and readable body paragraphs, plus canonical URL resolution. That is genuine behavioral context beyond the annotations.

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?

One compact sentence with the verb and resource front-loaded and no filler; the semicolon clause adds the input-flexibility fact without padding.

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?

An output schema exists so return values need not be spelled out, and annotations cover the safety profile; the description supplies purpose, input flexibility, and content type. Only the lack of explicit sibling routing keeps it from being fully complete.

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 0% and the single param is named only 'url', so the description carries the burden and does so usefully: it discloses that the input may be a canonical story URL or a headline, which an agent could not infer from a string parameter called 'url'. Not a 5 because no format or example is given.

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 (Express Tribune story metadata and readable body paragraphs), which distinguishes it from the sibling headlines/news/sections/author tools that cover listing or browsing rather than a single story. It does not explicitly name a sibling alternative, so it stops short of a 5.

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?

Usage is only implied: the phrase 'from a headline or article link' hints that this is the tool to reach for when you already have a specific story, but there is no explicit when-to-use guidance and no routing to expresstribune_headlines or expresstribune_news for discovery. Adequate but leaves the agent to infer the selection rule.

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