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

No annotations are provided, so the description is the only source of behavioral disclosure. It discloses that the body is discarded and only the status matters, which is useful. However, it doesn't state how the tool handles the varied params (ref, city, feed, json) or any side effects, rate limits, or error 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?

One sentence of eight words, front-loaded with the main action. It is appropriately terse, though it omits some necessary guidance; still, 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?

With 7 params, no annotations, and no output schema, the description leaves the agent without enough to call it correctly: it doesn't say which param(s) are required, what status code range to expect, or how it relates to sibling tools. It is a minimal hint rather than a complete tool description.

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?

All seven parameters already have individual descriptions in the schema (100% coverage), so the baseline is 3. The description itself adds no parameter-level meaning and even creates ambiguity by focusing only on 'public library docs URL' while many unrelated params exist.

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?

States a specific action: retrieving HTTP status for a public library docs URL. The phrase 'Body discarded' distinguishes it from content-fetching tools, but the resource is oddly specific given the generic schema with city, json, etc., so it isn't fully clear.

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 on when to use this tool versus siblings like fetch-status or web-fetch. The 'Body discarded' hint implies status-only checks, but no explicit alternative selection criteria are provided.

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