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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds genuinely useful non-schema context: a 10-credit Tier 1 cost and the mandatory inputs, which matter for an agent budgeting calls. It still says nothing about what the response contains or how the element is derived.

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?

Very compact and front-loaded: the core purpose leads, with structured bracket metadata for group, endpoint, requirements, and cost. Nothing is padded, though the endpoint string is redundant with the tool name.

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?

An output schema exists, so return values need no explanation. But for a 15-parameter astrological computation, the description omits how the element is determined, what the grooming guidance is keyed to, and any hint about the optional chart-shaping parameters — leaving the agent under-informed relative to the tool's complexity.

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 only 33% across 15 parameters, so the description carries a compensation burden it does not meet. It merely restates the four required fields (date, time, latitude, longitude) that the schema already marks as required, and leaves city, name, cosmogram, zodiacType, houseSystem, and ayanamsaId completely unexplained.

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 fragment 'Grooming focus + frequency by element' names the resource (grooming guidance) and the shaping dimension (astrological element), so an agent can broadly infer the output. But it is a terse noun phrase with no verb and never says what 'grooming focus' or 'frequency' actually mean in practice, and it does nothing to separate itself from the many sibling pet_* tools.

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 no when-to-use guidance, no when-not-to-use conditions, and never names an alternative among the pet_* siblings. The bracketed metadata (required inputs, cost tier) is operational detail, not selection guidance.

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