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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds genuine context beyond that: it is a configuration snapshot grouped by provider, mentions a monetization flag and sample domains, and steers away from using it as a per-domain lookup. It does not discuss size/shape of the payload or rate considerations, so a 4 rather than a 5.

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?

Three sentences, front-loaded with the core claim, then the usage triggers, then the alternative. The nested parentheticals (provider grouping, monetization flag, module example) make it dense but each clause carries real routing or content information, so it is informative rather than padded.

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?

A read-only, zero-parameter introspection tool backed by an output schema — the description needn't document return values, yet it still previews the four sections an agent will receive. Combined with the explicit fallback trigger and the sibling handoff, an agent has everything needed to decide whether to call it 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?

Zero parameters, so the baseline is 4 and there is nothing for the description to disambiguate. It correctly implies the tool is argument-free, and instead spends its words on non-parameter redirection (use convert_links for a named domain), which is the right use of space.

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 names a specific verb ('Mostra') and resource (bot capabilities), then enumerates the four concrete blocks returned: active-search marketplaces, public catalogs with monetization flags, convertible routes grouped by provider, and modules. It explicitly distinguishes itself from siblings by naming search_products, convertible_routes and convert_links, so an agent can tell it apart without opening any schema.

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 two explicit triggers: when a search/conversion fails due to an unsupported site, and when the user asks what the bot can do. It also states an exclusion rule — to check whether one specific domain converts, call convert_links with it instead — which is exactly the kind of when-not guidance that prevents misuse of a broad capability dump.

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