Get child categories

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

Annotations already declare readOnlyHint=true, so the description doesn't need to restate safety. The description adds no behavioral details beyond the example, such as behavior with null category_id or pagination. It does not contradict the annotations, but also does not enrich them.

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 a single sentence plus a call example, with no superfluous content. It is front-loaded with the core action and provides a meaningful example. Every element 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?

The tool is a simple getter with an output schema and read-only annotation, so the description doesn't need to explain return values. However, it omits explanations for the realtime parameters and doesn't address the optional nature of category_id, leaving some usage gaps for a new agent. It is minimally viable but not fully complete.

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 provides an example for category_id, giving partial meaning, but realtime_start and realtime_end are completely unexplained. This leaves two of three parameters without semantic guidance.

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 clearly states the tool's function: "Get child categories for a FRED category," using a specific verb and resource. It distinguishes from sibling tools like get_category or get_category_series by specifying the scope of retrieval. The example call adds concrete clarity.

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 implies the use case (retrieving child categories) but does not explicitly compare to alternatives or state when not to use this tool. The example provides context, but there is no direct guidance on choosing this over sibling tools such as get_category_related or get_category_tags.

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