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

No annotations are provided, so the description carries the transparency burden. It discloses the body is discarded, but omits redirects, error behavior, authentication requirements, and whether content type is returned even on non-200 responses.

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 main description is concise and front-loaded, but the tool definition overall is cluttered by 7 irrelevant parameters, which undermines clarity and makes the structure misleading.

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 there is no output schema, the description should explain what the tool returns beyond status and content type, and how errors are surfaced. It does not, and the parameter list adds unrelated options, leaving the tool incomplete for an agent to call 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?

Although every parameter has a description, most are unrelated to web-fetch (ref, city, feed, json, path, zone, query) and appear copied from other tools. The url description says 'normalize or cite' rather than fetch, which conflicts with the tool's stated 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 clearly states the tool performs an HTTP fetch and returns status and content type, discarding the body. This is a specific verb and resource, though it doesn't differentiate from sibling fetch/status tools.

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 description gives no guidance on when to prefer this tool over the many siblings (fetch-status, browser-url-ok, normalize-url, inspect-robots). It only states 'public URL' and body discarded, leaving selection up to inference.

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