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

The sentence 'Body discarded' is a useful behavioral disclosure that is not present in any annotation and tells the agent not to expect page content. However, it does not describe behavior for the non-URL parameters, multi-input selection, redirects, errors, or rate limits, especially important given there are no annotations to carry that burden.

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 two short sentences with no filler. The primary return values are front-loaded, and the body-discard warning is an essential additional fact that 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 tool with seven heterogeneous parameters and no annotations or output schema, this description is too thin. It does not specify which parameter is the actual fetch target, how content type is returned, or why the other parameters exist, leaving an agent uncertain about how to invoke the tool correctly.

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 schema already provides descriptions for all seven parameters, so the baseline is 3. The tool description adds little parameter-level meaning beyond the 'public URL' qualifier, and it does not explain how city, json, ref, or path relate to the stated URL-fetching purpose.

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 states a concrete outcome: HTTP status and content type for a public URL. It is clear what the tool does, though it does not differentiate itself from the similar sibling fetch-status, and the seven heterogeneous input fields (city, json, path, ref) are not reconciled with the URL-focused framing.

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?

There is no guidance on when to use web-fetch versus fetch-status, normalize-url, or browser-url-ok, and no exclusions are given. The phrase 'public URL' implies a usage constraint, but it is not enough to help an agent choose among sibling tools.

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