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 needn't re-state safety. It adds useful metadata operations don't get elsewhere – cost (10 credits, Tier 1), the endpoint method, required inputs, and the alias relationship – which is genuinely valuable for agent budgeting. But it says nothing about auth, rate limits, or failure modes. Its one real work product is a single sentence plus bracketed metadata; a 3 reflects adequate but incomplete behavioral context.

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 with the action and system in the first sentence, then a compact metadata block. No wasted prose. The alias note is arguably the sole candidate for trimming, but at this size the description is efficient and well-ordered.

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; the description instead supplies the operational context (cost, endpoint, required params, alias). Given the simple 4-param, 2-required shape and existing annotations, this is nearly complete. It only falls short of 5 because the alias relationship to the canonical tool is stated but its selection policy is not.

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%, so the schema documents `fields` and `precision` while `name` and `date` have types/patterns but no prose description. The description adds only that these are 'Required' and that the balance derives from name initials and the date, which lightly clarifies `name`/`date` semantics. It does not compensate for the 50% gap – it neither explains the pattern/format of `date` nor the minLength/maxLength on `name`. Baseline 3 is appropriate when half the schema is self-documenting.

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 computation ('Calculate the Balance number from initials of each part of the full name') and names the exact system ('Kabbalistic (Mathers strict)'). Unlike most numerology siblings, it even distinguishes itself semantically from the plain Kabbalistic balance by naming the strict system and describing the initials-based derivation, so an agent can route correctly.

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?

Gives no when-to-use guidance, no exclusions, and no comparison against the ~80 sibling tools. The '(Cursor-friendly alias for astroway_numerology_kabbalistic_strict_balance)' note implies equivalence but doesn't explicitly say 'prefer one over the other' or 'do not call both'. The agent must infer selection entirely.

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