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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, covering the safety profile. The description adds that it covers periods since 2015 but does not disclose return format, pagination, or other behaviors. Since annotations carry the main burden and the description does not contradict them, a 3 is appropriate.

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 short but awkwardly structured, mixing German and English and ending with an ellipsis ('nachwirkender …') suggesting truncation. It front-loads the Germany-only constraint but lacks a clean structure. It is concise but not well-organized, and the incomplete ending detracts from clarity.

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?

There is no output schema, so the description must explain what the tool returns. It only says it provides periods, not the format or detail level. The bestandteil enum has many specific options that are not explained in the description. For a tool with two parameters and no output schema, the description is insufficient for an agent to fully understand the response.

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 input schema has 100% description coverage for both parameters, with clear descriptions for datum and bestandteil. The tool description adds no additional parameter details beyond what the schema already provides. With high coverage, the baseline of 3 is correct.

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 states it provides periods of special protection against dismissal since 2015, listing specific groups like Mutterschutz and Pflegezeit. It is not a tautology and distinguishes from the sibling hr_kuendigungsfrist by the 'special' qualifier. However, the list is incomplete and the English translation is vague, so it is clear but not fully explicit.

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?

No guidance is given on when to use this tool versus alternatives like hr_kuendigungsfrist. The description does not mention exclusions or provide context for selecting this tool over siblings. It simply describes what it does, leaving the agent to infer applicability.

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