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

The only behavioral note is 'Body discarded,' implying only the status code matters. However, it does not disclose whether the URL is fetched, any side effects, rate limits, or what the response contains. With no annotations, the description carries the full burden and falls short.

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 concise and front-loaded with the main action, but it is under-specified. A single sentence with a useful clause ('Body discarded') is efficient, yet it omits critical context, making it more an under-specification than a well-structured summary.

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?

With 9 parameters, no output schema, and no annotations, the description is grossly incomplete. It fails to explain what the tool does with each parameter, what the response looks like, or any prerequisites. The mismatch between the description and the schema makes the tool nearly unusable without external knowledge.

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 schema description coverage is 100%, the tool description does not clarify how the parameters relate to the stated purpose. It mentions 'public library docs URL' but the schema includes city, feed, json, path, zone, etc., which are unexplained in context. The description adds no meaning beyond the schema and even creates confusion.

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 clear verb ('HTTP status') and a resource ('public library docs URL'), but the resource is oddly specific and does not align with the 9 unrelated parameters in the schema. It does not differentiate from siblings like fetch-status or browser-url-ok, which likely serve similar purposes.

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?

No guidance is given on when to use this tool versus alternatives. The description does not mention conditions, exclusions, or point to any sibling tool for similar tasks, leaving the agent to guess based on the name alone.

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