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

readOnlyHint and openWorldHint already establish this as a safe, self-contained read. The description adds useful content scope (founding year, cities, ordering process, phone), but says nothing about response format or data freshness, so it is a modest addition over the annotations.

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?

Two sentences with no redundant boilerplate; the parenthetical packs the coverage areas tightly. The most actionable line (when to call it) sits last rather than first, which is a minor front-loading miss.

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 no input or output schema, the description carries the burden of saying what comes back, and it does list the returned content domains. A note on output shape or language would round it out, but nothing essential is missing for a zero-arg info tool.

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 tool takes zero parameters, so there is no parameter semantics to explain; the baseline for a no-argument tool is 4.

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 concrete resource (the «Авентура» agency) and enumerates the information it carries: what it is, what it does, how to order, and a phone number. It is clearly distinguishable from the artist/place/case siblings, though it never names them.

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?

"Вызывай первым, если пользователь спрашивает про агентство или как оформить заказ" gives an explicit trigger condition plus a priority ordering (call first). It lacks an explicit when-not or a named alternative for adjacent questions.

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