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

Annotations already declare readOnly, idempotent, non-destructive, closed-world behavior, so the safety profile is covered. The description adds genuine behavioral context beyond that: it returns a short answer plus a check date and URL, and that it is a lookup over curated guides rather than a live computation. It does not say what happens when no guide matches.

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?

A single sentence with the country front-loaded, so the critical disambiguator is read first. It is dense but every clause (topics, return fields) carries information; no filler.

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 one-parameter, read-only lookup with no output schema, the description covers purpose, scope, and return shape, which is enough for an agent to call it correctly. The missing piece is routing guidance against the many country- and topic-specific siblings.

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?

Only one parameter and schema description coverage is 100% ('The question or keywords'), so the baseline is 3. The description's topic list marginally clarifies the intended query domain but adds no syntax, length, or formatting guidance beyond the schema.

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 specific verb ('Finds the Payotte guide'), the resource (Germany home guide), and the topical scope (buying, financing, selling, renting, owning). The 'GERMANY' prefix and the explicit country make it trivially distinguishable from the parallel guide_au/guide_be/guide_es siblings.

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?

The topical enumeration ('buying, financing, selling, renting or owning a home in Germany') implies when this guide is the right destination, but there is no explicit guidance on when to prefer it over narrower siblings like mortgage_payment_de, rents_de, or purchase_costs_de, nor any exclusion criteria. Usage is inferable but not stated.

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