children_create_child

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It only says a child profile is added, which essentially restates the create action; it does not disclose side effects, whether the operation creates immediately, any uniqueness constraints, or what happens on failure. There is no contradiction, but also almost no behavioral depth beyond the tool name.

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 short sentence with no filler or redundancy. It is front-loaded with the action, though the brevity borders on under-specification; that gap is handled more directly by other dimensions.

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?

For a simple create operation with fully documented parameters and an output schema, the one-sentence description is largely sufficient to let an agent invoke the tool correctly. The main missing piece is explicit guidance about when to choose this over update/get/list, but the low complexity plus rich schema makes the overall definition reasonably 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 100%, so the input schema already documents all four parameters including birth_date format and birth_time optionality. The description itself provides no parameter-level detail, but the baseline of 3 applies because the schema carries the semantic weight.

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 uses a specific verb-resource pair, 'Add a new child profile', leaving no doubt that this tool creates a child entity. The word 'new' also distinguishes it from the sibling children_update_child, which modifies an existing profile. It is concise and unambiguous.

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 wording 'Add a new' implies this is the creation counterpart to children_update_child, children_get_child, and children_list_children, but the description never explicitly states when to use it instead of those siblings. No exclusions, prerequisites, or alternatives are named, so usage guidance is only implied.

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