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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world), so the description only needs to add context. It does: the 10-credit Tier 1 cost and the age-35 activation semantics are meaningful operational/domain details not derivable from annotations or schema.

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 sentences with the core definition front-loaded, followed by compact group/cost tags that carry real selection value. No wasted prose, though the bracketed metadata is slightly template-like.

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 needn't be described, and annotations carry the safety profile. The description supplies the domain meaning and cost, leaving only minor gaps around parameter usage.

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 coverage is 50%: 'fields' and 'precision' carry good descriptions, while 'name' and 'date' are undocumented in both schema and description. Those two are largely self-evident from their patterns (YYYY-MM-DD regex, 2-120 char name), so the description need not compensate heavily, but it adds nothing about parameter meaning.

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 the Maturity number') and defines it ('sum of Life Path and Expression, activates around age 35'). The 'Numerology: Vedic system' label lets an agent distinguish it from the many Chaldean/Kabbalistic/Pythagorean maturity siblings without opening a schema.

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 Vedic system tag implicitly tells the agent when to pick this variant over the Chaldean/Kabbalistic/Pythagorean maturity tools, but there is no explicit when-to-use/when-not statement and no alternatives are named. Usage is inferred rather than stated.

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