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

There are no annotations, so the description carries the full burden. It discloses one behavior fact ('Body discarded'), but says nothing about error handling, redirects, response format, side effects for non-URL parameters, or whether parameters are mutually exclusive. The schema already says 'discarded' for several parameters, so the description adds minimal new insignia.

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 a single two-clause sentence, which is concise. However, it suffers from under-specification rather than concision—the single fact it supplies does not justify its place for a tool with 9 parameters. It is not redundant, but it is incomplete enough that the three points fits only marginal.

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 9 parameters, no annotations, and no output schema, this description is essentially inadequate. An agent can't tell what to do with the timezone, city, json, query, path, or feed parameters, nor whether any are alternatives or additional filters. The description leaves the tool almost completely unspecified.

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 a baseline of 3 applies, but the description adds no unifying semantics for any of the 9 parameters. It also contradicts one schema hint: the description says 'public library docs URL' while the url parameter description says 'HTTPS URL to normalize or cite'. The description leaves eight parameters entirely unexplained here.

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 output (HTTP status) and a resource (a public library docs URL), but it does not align with the 9-parameter input schema covering city, timezone, JSON, query, path, feed, etc. The purpose is therefore ambiguous and does not communicate what the tool as a whole actually does. It also does not distinguish it from siblings like 'fetch-status' or 'browser-url-ok'.

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 about when to prefer this tool over the many sibling URL- or hint-related tools. The one unsolicited mention of 'public library docs URL' is not enough to classify it from alternatives, and the description leaves no exclusion or alternate route for the other parameter types.

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