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

readOnlyHint=true already covers the safety profile, and the description adds real context beyond it: the exact return shape (publicLinks with website[] and maps[] contents), the fact that the protocol endpoint remains POST .../mcp, and the caveat that two Smithery listings map to two machines. This is genuine added behavioral context.

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 WHAT/RETURNS/USE labels front-load the important parts, which is good structure, but the body is a dense run-on of abbreviations and parentheticals that is hard to parse on first read. Some of the enumerated link sources (SSL Labs, Glama, getlulu) are padding rather than decision-relevant.

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?

An output schema exists, so return values needn't be spelled out, yet the description still documents them helpfully. Combined with the usage cues and exclusions, an agent has enough to call this correctly, though the dense phrasing leaves the get_it-vs-mcp-hub selection slightly under-specified.

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 coverage is 100% and the locale enum is fully documented in the schema, including the de-has-no-prefix rule. The description merely echoes that ("de has no prefix") and adds no syntax or format detail beyond the schema, so the baseline 3 applies.

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 WHAT/RETURNS/USE structure states a specific resource (HTML hub /mcp-hub) and explicitly differentiates it from the protocol endpoint and from get_it by listing the extra publicLinks it returns. It names the sibling get_it it overlaps with, so an agent can separate them. The density of abbreviations (npm CLI, SSL Labs, Glama) muddies it slightly but the core purpose is 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?

It gives an explicit use case ("USE to cite discovery URLs") plus concrete exclusions ("NOT Italian, NOT the protocol endpoint... Not GitHub. Not com.ikeytz/website"). It lacks a when-not-to-use-this-instead-of-get_it condition, but the routing cues are strong.

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