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

Annotations already declare readOnlyHint and openWorldHint, so the safety profile is covered. The description adds useful context that the article must be 'public' and from a 'canonical' URL, but discloses nothing about rate limits, partial-content behavior, or failure modes for non-canonical URLs. Some added value, but not rich behavioral detail.

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 tightly written sentences with zero filler. The core purpose is front-loaded, and the sibling routing follows immediately, so the agent gets both what it does and what to use instead in one read.

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, the description needn't explain return values, and it correctly notes metadata plus body paragraphs. Combined with annotations covering the safety profile, it is nearly complete; the only minor gap is that it does not address what happens when a non-canonical or invalid URL is supplied.

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% with a single documented url parameter, so the schema does the heavy lifting. The description reinforces the 'canonical' URL constraint, which adds a little meaning, but does not add format or example detail beyond the schema. 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 precise resource (public Salon article), and the exact return scope (metadata and body paragraphs) from a canonical url. It also names the sibling tools it is not, so an agent can distinguish salon_article from salon_headlines/salon_sections/salon_news without opening any 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: salon_headlines for story lists, salon_sections to browse topics, salon_news for the general feed. This makes clear that salon_article is the tool for a specific known article URL, and the alternatives are enumerated with their selection conditions.

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