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

The annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds the returned profile fields and the exactly-one-parameter constraint, but does not disclose other behavioral traits such as news-item limits, error behavior, or authentication needs.

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 front-loaded with the core purpose and avoids unnecessary sentences. However, the long opening sentence duplicates the schema's enumeration of associations and profile fields, which slightly reduces efficiency.

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?

The tool is a simple two-parameter detail lookup, and the description covers the purpose, return content, parameter constraint, and relevant sibling alternatives. With annotations and an output schema already present, nothing essential is missing for correct invocation.

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 100%, and the schema already lists every federation id and regional association value in detail. The description reinforces the exactly-one-of constraint but adds no syntax or format guidance beyond what the schema provides, so the baseline 3 is appropriate.

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 a specific verb and resource: it returns the profile of one of the 22 federations or one of the five regional associations, and enumerates the profile fields. It also names sibling tools for related tasks, so an agent can distinguish this detail-lookup tool from fussballde_filters and fussballde_news.

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?

It explicitly states the parameter rule: provide exactly one of federation_id and regional_association. It also gives clear alternatives and conditions, telling the agent to use fussballde_filters for federation ids and fussballde_news for national news.

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