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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and a closed-world profile, so the safety burden is lifted. The description adds the billing context (10 credits, Tier 1), which is genuinely useful behavior information, but nothing about computation cost, time span covered, or what a perfection event contains.

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?

It is extremely short and front-loads the one substantive phrase, with group and cost as bracketed metadata. There is no padding, but the brevity reflects under-specification rather than disciplined conciseness.

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 not be explained, but the description still leaves an agent unable to distinguish this Hand-tradition perfection tool from the parallel Brennan/Greenbaum/Schmidt families or to know what tradition-specific notion of 'perfection' is applied. For a natal-chart-based timing tool in a dense sibling cluster, this is too thin.

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% and the nested birth-data object is heavily documented, so the schema does the heavy lifting. The description contributes nothing about body, fields, precision, or the targetAge branch of the anyOf, so the baseline 3 applies.

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 phrase "Perfection-of-aspects timing" names the Hellenistic technique the tool computes, and the [Group: Hellenistic: Hand tradition] tag differentiates it from the Brennan/Greenbaum/Schmidt siblings. However, it is a bare noun phrase with no verb or statement of what is actually returned, so an agent cannot tell exactly what output this produces versus e.g. astroway_hellenistic_hand_decennials.

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?

There is no when-to-use guidance, no prerequisites, and no named alternative. The only contextual lines are a group tag and a credit cost, neither of which tells the agent when this tool should be selected over the many other timing/profection tools.

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