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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds useful content-level context by stating the return includes a byline profile plus recent story links, telling the agent what kind of payload to expect beyond the mere act of fetching.

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, zero filler, with the purpose front-loaded and the sibling routing placed second. Every clause earns its place.

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?

For a one-parameter read-only fetch with an output schema present, the description needs only to state purpose, input expectation, and the relevant alternative, all of which it does. Return values are handled by the output schema, so nothing an agent needs is missing.

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% with a single 'url' parameter, so the schema carries the documentation burden. The phrase 'canonical author URL' in the description roughly mirrors the schema and adds no syntax, format, or validation detail beyond it. 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'), a specific resource ('author's byline profile and recent story links'), and the required input ('from a canonical author URL'). It explicitly contrasts with businessstandard_article, so an agent can distinguish profile-level from story-level fetches without opening either 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?

The second sentence names a concrete alternative (businessstandard_article) and the condition that selects it ('for one story's full content'), which is explicit routing guidance. It stops short of naming other related siblings like businessstandard_headlines or businessstandard_news, so it is clear but not exhaustive.

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