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

With no annotations, the description carries the burden of behavioral transparency. 'List' and 'supported' clearly imply a non-destructive read-only enumeration. However, it does not explain output scope, whether family filters results, or auth/rate-limit context; this is acceptable for a simple catalog but not info-rmative.

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?

One short, front-loaded sentence with no filler or repetition. Every word contributes meaning.

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?

Although the tool is simple and has an output schema, the description omits the meaning and usage of the only optional parameter. It also provides no usage guidance against sibling tools, so an agent cannot confidently decide when to pass a family value.

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 only parameter 'family' has 0% schema description coverage, and the description does not explain how it affects results or what valid values look like. The phrase 'endpoint families' provides a weak semantic anchor but does not compensate for the missing documentation.

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 clear verb ('List'), a clear resource ('ENTSO-E endpoint families'), and a scope ('supported'). This differentiates it from sibling list_* tools such as list_derivs and list_zones, which operate on different resource types.

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 about when to use this tool versus sibling list tools or get_* data tools. It does not explain when the optional family parameter is useful, nor any alternatives or exclusions.

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