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

Annotations already declare readOnly, idempotent, non-destructive, and closed-world, so the safety profile is covered. The description adds a genuinely useful non-schema fact — the 10-credit Tier 1 cost — but says nothing about output shape, determinism of age boundaries, or any prerequisite beyond name and date.

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 tight, front-loaded sentences with no filler; the grouped metadata lines are compact. Nothing is padded, though the description is arguably under-informative rather than over-long.

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 described, and annotations cover the safety profile. What is missing for a 4-parameter tool sitting among dozens of numerology siblings is any usage context or parameter-format detail, leaving the definition only minimally 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 only 50%, and the two undescribed parameters are the required ones (name, date). The description adds no format guidance, so an agent gets no help on the name-length or YYYY-MM-DD date constraints beyond what the raw pattern shows.

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?

States a specific verb and resource ('Calculate four Pinnacle cycles with their age boundaries') and scopes it to the Chaldean system via the group tag, which is enough to separate it from the Kabbalistic/Pythagorean/Vedic pinnacle siblings. It is clear but relies on the name and group marker rather than prose for that differentiation.

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, when-not-to-use, or alternative-tool guidance. The agent is left to infer from the group tag that this is the Chaldean variant of the pinnacle calculation, and nothing tells it how this differs in purpose from challenge, maturity, or life_path calls.

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