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

The annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description adds operationally useful context beyond them: the endpoint, the required inputs, and the cost (10 credits, Tier 1), which materially affects whether an agent should call it. It does not describe rate limits or what happens on an invalid name.

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?

Front-loaded one-sentence purpose followed by four dense bracketed metadata lines with no filler. The '[Group: ...]' line is mildly redundant with the title and name, but everything else (endpoint, required params, cost) earns its place.

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 explained, and the description supplies endpoint, required inputs and cost. For a single-purpose deterministic calculator that is close to sufficient; only the ambiguity around the 'date' parameter keeps it from being fully 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 coverage is 50%: 'fields' and 'precision' are documented in the schema, while 'name' and 'date' have no descriptions. The description compensates partially by stating the name must be the full birth name (not a nickname) and by listing both as required, though it never states that 'date' is the birth date or which name variant the Vedic system expects. Baseline 3 for this coverage level.

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 (Calculate), a specific resource (the Personality number), the derivation rule (from the consonants of the full birth name) and the system (Vedic). That derivation plus the system label is enough to separate it from the ~20 sibling personality calculators (Chaldean, Kabbalistic, Pythagorean, numks) without opening any 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?

There is no explicit when-to-use/when-not statement or named alternative. Usage is only implied: the 'Vedic system' tag routes the agent within the numerology family, and the 'consonants of the full birth name' rule implicitly distinguishes it from Soul Urge (vowels) and Expression (all letters). Adequate but no exclusion guidance.

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