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

Annotations already declare readOnly=true, idempotent=true, destructive=false, so the safety profile is fully covered. The description adds genuinely useful non-annotation context - 10-credit Tier 1 cost and the POST endpoint - but nothing about latency, auth, or result shape. With annotations carrying the behavioral load, this is a modest value-add rather than a rich disclosure.

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?

The operative sentence is front-loaded and waste-free, and the bracketed group/endpoint/required/cost tags are terse and scannable. Slightly boilerplate-heavy, but nothing is padded or redundant.

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 cost, endpoint, and required inputs are all disclosed. The one real gap is that a tool sitting among dozens of near-identical sibling variants gives no cue for when this one is the right pick.

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%: the two optional params (fields, precision) are documented in-schema, while name and date carry no descriptions. The phrase 'from initials of each part of the full name' usefully implies `name` must be a multi-part full name and gestures at the derivation, but the date format and length constraints are left entirely to the schema.

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'), resource ('Balance number'), and derivation ('from initials of each part of the full name'), then pins the variant with 'Pythagorean system.' Against a sibling set containing chaldean_balance, kabbalistic_balance, and vedic_balance, this cleanly separates both the number type and the system.

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 description says what gets computed but offers no when-to-use guidance and no rule for choosing Pythagorean over the Chaldean, Kabbalistic, Vedic, or numks/numk variants of the same Balance calculation. The endpoint and required-parameter tags are metadata, not selection guidance.

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