get_category_children

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

Annotations already indicate read-only, open-world, and idempotent behavior. The description adds the context of tree-walking and the special id 0, which is consistent. It does not contradict annotations but adds minimal behavioral detail beyond 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 extremely concise with two sentences, immediately stating the core purpose and a key usage hint. Every word is necessary, and there is no extraneous information.

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 description adequately explains the input and purpose, but it does not describe the output format or structure. While the tool is simple and annotations cover safety, the absence of output details (e.g., returns an array of category objects) leaves some ambiguity for the agent.

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 already provides a full description for the single parameter (category_id), including the note that 0 is the root. The description reinforces this with 'use id 0 for the top-level categories,' but adds no new meaning beyond what the schema covers, so a baseline score of 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 clearly states the tool's function: listing child categories of a FRED category. It specifies the use of id 0 for top-level categories and identifies itself as the primary way to walk the category tree downward, distinguishing it from sibling tools like get_category or get_category_series.

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 provides clear context by calling it the 'primary way to walk the category tree downward,' implying when to use it. However, it does not explicitly state when not to use it or name alternative tools, leaving some room for interpretation.

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