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

Body discarded is a useful behavioral disclosure, and 'HTTP status and content type' implies a read-only network operation. But with no annotations provided, the description carries the full burden and does not mention auth requirements, redirects, timeouts, error behavior, or whether the operation has side effects, so an agent cannot fully predict its behavior.

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, information-dense sentences with no filler; 'Body discarded' earns its place. It is concise but arguably too terse relative to the complexity of the 9-parameter schema, so I would not give full marks.

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 no annotations, no output schema, and 9 optional parameters, this description is insufficient. It doesn't explain how to select between the many input fields, what happens if multiple are provided, what output shape is returned, or how it relates to the large sibling set.

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 descriptions cover all 9 parameters (100% coverage) with specific meanings and discard behavior, so the baseline applies; the description adds no parameter-level detail. It also fails to explain which parameter should be used for the single 'public URL' case, leaving url versus feed versus host ambiguous.

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's output for a public URL—HTTP status and content type—and explicitly says the body is discarded, which distinguishes it from content-fetching tools. However, it lacks a verb and does not differentiate it from sibling tools like fetch-status, and the 9-parameter schema, most of which are not URL fields, makes the actual scope ambiguous.

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 use web-fetch over siblings such as fetch-status, browser-url-ok, or normalize-url. It only says 'public URL' as a scope condition; it does not state what types of tasks it suits, what inputs it expects, or when not to use it.

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