Get a baby's exact age from a birth date - years, months, weeks, days, totals, zodiac sign, the current and next milestone, and special-day dates (100 days, first birthday, 1000 days). Use for any 'how old is the baby' question instead of computing it yourself.
| Name | Required | Description | Default |
|---|---|---|---|
| birthday | Yes | The baby's birth date as YYYY-MM-DD (not in the future). |
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description fully bears the burden. It clearly states what the tool computes and returns, including outputs like zodiac sign and milestones. It does not mention error handling or side effects, but as a read-only calculation, this is adequate.
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 two sentences with no wasted words. It front-loads the core purpose and lists outputs concisely. Every sentence adds value.
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 has one string parameter and no output schema. The description lists all outputs (age breakdown, zodiac, milestones, special dates), providing a complete picture of what the agent can expect. Missing error handling is acceptable for this simple tool.
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% for the single parameter 'birthday', which fully defines it. The description does not add additional meaning beyond the schema for this parameter, so a baseline 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 computes a baby's exact age from a birth date and lists specific outputs (years, months, weeks, days, totals, zodiac, milestones, special dates). It distinguishes from siblings by offering a comprehensive age calculation, while siblings focus on individual aspects.
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 explicitly says 'Use for any 'how old is the baby' question instead of computing it yourself,' providing clear guidance on when to use. It does not mention when not to use or alternatives, but the context is sufficient.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
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Each tool serves a distinct purpose: age calculation, milestone dates, zodiac sign, and milestone listing. No overlap in functionality.
All tool names follow a consistent verb_noun pattern with snake_case (get_baby_age, get_milestone_dates, get_zodiac_sign, list_milestones).
Four tools are appropriate for the domain, covering core baby age queries without being excessive or insufficient.
The tool set covers all essential aspects: age calculation, milestone dates, zodiac sign, and a reference list of milestones. No obvious gaps for the stated purpose.
