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

readOnlyHint=true and openWorldHint=false already establish that this is a safe, self-contained read, so the description only needs to add context. It does add real value: the fallback script for out-of-coverage cities. But it says nothing about what the tool actually returns (a fixed text block? links? markdown?) or whether the content is static, which is the salient behavioral question for a content-delivery tool.

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?

Word count is reasonable, but it is delivered as one long run-on sentence with an imperative instruction ('si preguntan por otra, dilo y ofrece...') buried in a parenthetical mid-enumeration, which makes it harder to parse than a short topic list plus a separate routing line. The front-loaded contrast with buscar_eventos is the strongest structural choice.

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 no-parameter, no-output-schema informational tool, the description enumerates enough of the covered topics that an agent can decide whether a caller's question falls inside its scope. The one gap is the unresolved boundary with 'ciudades', which matters because that sibling exists.

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?

The input schema has zero properties, so there are no parameters whose semantics could be elaborated; the baseline of 4 applies. Nothing in the description misrepresents the parameter surface.

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 opening 'Lo que no es buscar eventos' explicitly positions the tool against the sibling buscar_eventos, and the sentence enumerates concrete content: authorship/contact, city coverage, event-proposal links, newsletter, MCP setup, suggestions. It is clear what the tool is. However, the claim that it answers 'qué ciudades cubre' overlaps with the sibling 'ciudades' and the description never resolves which one an agent should prefer for that question.

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 routing rule for the ambiguous case: if the user asks about a city not covered, say so and offer the Spain-wide hackathons. It also implies when to call it (contact, propose event, newsletter, MCP, suggestions). It stops short of saying when to defer to 'ciudades' for plain city lookups, which is the one remaining ambiguity among the siblings.

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