Destiny Matrix: Ladini Method

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 handled. The description adds genuinely non-obvious behavior: digit-sum reduction above 22, how points D and E are derived, the `code` string format "3-7-22", and that love and money chains share the `crossing` point. It omits nothing critical for a deterministic read, though it does not mention the 20-credit cost or any failure mode for malformed dates.

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?

Content is front-loaded with the method and the output structure, and nearly every clause carries a distinct fact (points, lines, reduction rule, response fields). It is one dense run-on block of jargon with no formatting, which slightly hurts scannability, but there is no filler.

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?

With one parameter, full annotation coverage and an output schema present, the description is close to complete: it explains the derivation rules and names key response fields rather than leaving the agent to infer them. The remaining gap is interpretive scope — it does not say whether arcana come with meanings or only numbers.

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 0%, so the description must carry the meaning, and it usefully reframes the lone `date` parameter as a birth date (not an event/transit date) and explains how its day, month and year digits map to points A, B and C. The YYYY-MM-DD format itself is enforced by the schema pattern, so no repetition is needed. Only minor gap: no note on timezone or calendar caveats for the birth date.

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 precisely what is computed: the Destiny Matrix per Natalia Ladini's method from a birth date, enumerating the personal square (points A–E), ancestral corners, sky/earth lines and personal purpose. It is unambiguous against the numerology siblings because it names a distinct system and its structural outputs. It stops short of an explicit action verb ("compute/return") and never contrasts itself with a sibling.

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?

Usage is only implied: the phrase "from a birth date" signals the prerequisite input, and the group label "Destiny Matrix" hints at the topical context. There is no statement of when to prefer this over numerology, Pythagorean/Chaldean chart tools, or the reports endpoints, and no exclusions or edge cases (e.g. what to do for unknown birth time).

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