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

With no annotations, the description carries the full burden. 'Body discarded' is a useful behavioral disclosure, and the intended output (status and content type) is clear. However, it does not disclose network side effects, error behavior, redirects, or the fact that many schema parameters appear irrelevant to the fetch.

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 short sentences, front-loaded with the core purpose and ending with a critical behavioral caveat. There is no redundant wording; every word 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?

Given nine optional parameters, no annotations, and no output schema, the description is too thin. It never explains which parameter to supply, what happens when URL is absent, or the exact shape of the returned status/content-type result. The contrast with the many sibling shape-check tools makes this gap more consequential.

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%, so the schema already documents each parameter. The description adds no parameter-level meaning and does not clarify that the URL is the primary meaningful input while the other eight parameters are mostly discarded. Baseline 3 is appropriate because the schema carries the load.

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 clearly identifies the tool's resource (public URL) and what it reports (HTTP status and content type), and the note 'Body discarded' prevents a common misunderstanding. It does not explicitly distinguish itself from siblings like fetch-status or browser-url-ok, so it stops short of full sibling differentiation.

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 phrase 'for a public URL' gives a minimal scope hint, but there is no guidance about when to choose web-fetch over fetch-status, browser-url-ok, or normalize-url. No when-not-to-use conditions or alternative tools are mentioned.

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