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

With no annotations present, the description carries the burden of behavioral disclosure. It clearly states the tool is read-only ('Reine Datenauskunft') and describes what the response contains: current values per Richtwertzone, earlier valuation dates for Brandenburg, official address, source, and license. It does not mention errors or rate limits, but for a simple query tool this is reasonably 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 two sentences with no filler. It front-loads the core result and then efficiently covers input modes, geographic scope, and an important caveat. Every sentence earns its place.

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 tool with no output schema and no annotations, the description explains the return value well (unit, zone semantics, source, license, historical values). The main gap is that it does not explicitly state what happens if neither adresse nor lat/lon is provided, though 'Eingabe entweder ... oder ...' strongly implies exactly one input mode is required.

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 coverage is 100%, so the baseline is 3. The description adds meaningful value beyond the schema by explaining the either/or relationship between adresse and lat/lon, requiring PLZ in the address, and giving a concrete example. This helps an agent correctly choose and combine parameters.

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 uses a specific verb ('Liefert') with a concrete resource ('amtlichen Bodenrichtwert in EUR/m2'), plus geographic and temporal scope (Berlin/Brandenburg, current values, earlier dates for Brandenburg). It clearly distinguishes the tool's function as a data query rather than a valuation service.

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 gives clear input-mode guidance: either an address with PLZ or lat/lon in decimal degrees, including an example and the instruction to leave address empty when using coordinates. There are no sibling tools to differentiate against, but the 'Reine Datenauskunft, keine Wertermittlung' note provides a meaningful use boundary.

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