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

Annotations already declare readOnly, idempotent, non-destructive, and closed-world, so the safety profile is covered. The description adds real domain semantics beyond that: L1 means mandated by the breed club's Zuchtordnung, and the caveat that a listed qualzucht trait does not mean every dog of the breed is affected — a genuine interpretive warning.

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?

Front-loads the usage trigger and then the data contents, which is the right order, and every clause carries information. It is somewhat long and the trailing German translation repeats content the agent has already read, which slightly dilutes efficiency but serves a bilingual audience.

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 output schema, the description must carry the return-value burden and does: it names the grade and rationale, hereditary diseases, required tests, and the optional qualzucht_traits field plus its interpretation caveat. For a one-param read tool this is complete enough to call correctly.

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?

There is a single parameter with 100% schema description coverage, so the schema already documents breed_slug and its pattern. The description never references breed_slug and adds no format, source, or validation meaning 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?

States a specific verb+resource (get a breed's health profile) and enumerates the returned content: the S–E breeding-health grade with rationale, hereditary diseases, required health tests, and qualzucht traits. It is clearly distinguishable from search_breeds and the other siblings, which retrieve breeders, dogs, or breed lists rather than health data.

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?

Explicitly tells the agent when to reach for it ('Use when someone asks how healthy a breed is, which hereditary diseases it has, or which health tests to ask a breeder for') with concrete trigger examples in two languages. It does not name a competing sibling or a when-not condition, so it falls short of a full 5.

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