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

There are no annotations, so the description bears the full transparency burden; it clearly discloses that the response body is not returned and only status/content type remain. It does not cover edge cases such as redirects or errors, but the main behavioral constraint that prevents misuse is explicitly stated.

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, no filler, and the returned information plus the body-discard constraint are front-loaded. 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?

For a 9-parameter tool with no annotations and no output schema, this description does not explain how optional inputs such as city, json, zone, query, path, or feed relate to fetching a public URL. The schema documents each parameter individually, but the overall contract remains ambiguous because it is unclear which parameter is the primary fetch target.

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 nine parameters are already documented and the baseline is 3. The tool description adds no additional parameter-level meaning beyond referring to a public URL, so it neither improves nor harms parameter understanding.

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 the output (HTTP status and content type), the scope (public URL), and a key constraint (body discarded), so the tool's purpose is clear. It does not contain an explicit verb like 'fetch' and does not differentiate it from sibling tools such as fetch-status or browser-url-ok, so it falls 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?

'Body discarded' plus 'public URL' implies that this tool is appropriate only when headers/status are sufficient and the target is publicly reachable. The description never names an alternative or explicitly says when not to use web-fetch, so the guidance is implied rather than explicit.

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