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

With no annotations, the description carries the behavioral burden. It discloses meaningful behavior: slug lookup, postal-code first-hit behavior, substring name matching, and the effect of compact=true omitting location texts. It does not mention return shape or error behavior, but the core lookup behavior is transparent.

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?

The description is very short and front-loaded with the core purpose and lookup behavior. Every phrase contributes, though the German 'Lage-Texte' jargon and cryptic arrow notation could be clearer. Oveall it is efficient rather than bloated.

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?

Given six optional parameters, no schema descriptions, no output schema, and no annotations, the description is incomplete. It does not clarify what fields and locale do, what the returned service area object looks like, or how this lookup differs from the many sibling find_by_* tools.

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?

Schema description coverage is 0%, so the description must compensate. It does clarify slug, plz, name, and compact, but fields and locale are completely unexplained. The arrow-based lookup chain is ambiguous about whether parameters combine or are tried in sequence, leaving room for misinterpretation.

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 identifies the tool as a service-area lookup and explains the lookup precedence (slug → plz first hit → name substring), which is a specific and useful definition. It does not explicitly differentiate from overlapping siblings like find_by_plz or find_by_area, but the lookup chain gives it a distinct identity.

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 description explains the lookup mechanism but gives no guidance on when to choose this tool over find_by_plz, find_by_area, find_by_gebiet, or list_service_areas. No exclusions, alternatives, or context for the lookup path are provided.

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