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 and determinism profile is fully covered by structured data. The description adds the positional structure of the output (centre, body, soul, karmic, resource arcana) but says nothing about cost behavior beyond the metadata tag or rate limits. Modest added value on top of annotations.

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 front-loaded sentences: the calculation statement first, then a compact enumeration of the output structure, followed by group and cost tags. No redundancy or filler; the group/cost lines are the only slightly extraneous content, though they are operationally useful.

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 the description needn't enumerate return values, and annotations cover the safety profile. The description appropriately frames the scope (22 positions, named arcanum groups) and input. It is complete enough for correct invocation, with only minor gaps around date format expectations.

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 67%: 'date' has only a regex pattern and no prose description, while 'fields' and 'precision' are documented in the schema as compact-mode options. The description confirms the birth-date input but adds no format, timezone, or interpretation guidance for the date parameter. Baseline 3 is appropriate since the schema carries most of the load.

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 description states a specific verb and resource ('Calculate the full 22-position Destiny Matrix') and names the exact methodology ('Natalia Ladini's method') and input ('from birth date'). This clearly distinguishes it from the many numerology siblings (Chaldean, Kabbalistic, Pythagorean, Vedic), none of which produce a Destiny Matrix.

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 method name and required birth-date input imply when this tool is relevant, and the sibling set makes the alternative numerology tools obvious. However, there is no explicit when-to-use/when-not-to-use statement or guidance on choosing Destiny Matrix over the plain numerology tools. Usage is implied rather than stated.

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