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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered. The description's only added behavioral fact is the '[Cost: 10 credits (Tier 1)]' note, which is genuinely useful and not present in the structured fields. Beyond that it discloses nothing about what is computed or returned.

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?

Two short lines with no filler, and the core statement is front-loaded before the group and cost tags. It is efficient, though its brevity is under-specification rather than disciplined concision.

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 specialized Hellenistic technique tool, the description never explains what a quarter lord is or why both a birth body and a required targetDate are needed. The output schema means return values needn't be described, but the technique and the purpose of targetDate remain unexplained, leaving a real gap for correct invocation.

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 schema already documents body fields, fields, and precision in detail — baseline 3 applies. The description says nothing about the parameters, and notably does not explain the required targetDate field, which is unusual alongside the natal birth data.

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 'Lord of the chart's seasonal quarter' largely restates the tool name (Quarter Lord) with slightly more specificity about the seasonal quarter. It names no concrete output or operation, and with dozens of sibling Hellenistic tools (Brennan, Greenbaum, Schmidt, Hand variants) there is no differentiation beyond the name prefix. An agent unfamiliar with the tradition cannot tell what this returns.

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 at all — no conditions, no alternatives, no prerequisites. The '[Group: Hellenistic: Hand tradition]' tag does hint at the author/tradition, which weakly helps route among the Brennan/Greenbaum/Schmidt variants, but that is categorization metadata, not usage instruction.

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