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

No annotations are provided, so the description carries the full burden. It honestly states 'Page content is not stored,' which is a useful privacy disclosure. However, it fails to disclose that the other eight parameters are accepted and then discarded, and it gives no hints about network access, error handling, or the actual shape of the returned data.

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 tight sentences with no filler. The main outcome is front-loaded, and the storage behavior note follows naturally. Each sentence earns a place, but the brevity leaves gaps elsewhere.

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 parameters, no annotations, and no output schema, the description is under-specified. It returns only the field list ('host, scheme, HTTP status') without a structure, doesn't mention that every non-url parameter is ignored, and gives no error or edge-case behavior. An agent cannot be confident about what to pass and what to expect.

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 all nine parameters. The description adds no extra meaning beyond hinting that 'url' is the important one. With high coverage, baseline 3 is appropriate; no bonus beyond that.

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 specific verb and resource: 'Return host, scheme, and HTTP status for a URL.' This is clear and concrete. It does not explicitly differentiate itself from siblings like fetch-status or web-fetch, which might also deal with HTTP status and URLs.

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 provides no guidance on when to use this tool versus alternatives. It never mentions excluded cases, prerequisites, or names sibling tools to route the agent. Implicit usage is only through the phrase 'for a URL', but no conditions or exclusions are stated.

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