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

Annotations already declare readOnlyHint/idempotent/non-destructive, and the description adds genuinely useful context beyond them: cost (10 credits, Tier 1), the endpoint, and the required inputs. It doesn't mention latency or failure modes, but for a deterministic calculation tool this is solid added value.

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 leading sentence is front-loaded and the bracketed metadata is scannable rather than prose bloat. The group line slightly duplicates the system name already stated in sentence one, but overall it is tight and earns its space.

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 an output schema present, return values need no explanation, and the description covers system, required inputs, cost tier and endpoint. What's missing is any cue on choosing this variant over the ~80 numerology siblings, but the alias note partly covers that.

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 self-documented, while `name` and `date` have only type/pattern constraints. The description restates the required pair and explains the reduction ('year + month + day, reduced'), but never explains why a `name` is needed for a Life Path calculation — a real semantic gap the schema also leaves open.

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) and resource (the Life Path number) and pins the exact variant: 'Kabbalistic (Mathers strict) system', which is exactly what separates it from the pythagorean/chaldean/vedic and non-strict kabbalistic life-path siblings. It even names the canonical tool it aliases, so the agent can disambiguate without reading the 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?

The '[Group: ...]' and '[Endpoint: ...]' metadata imply the context of use, and the alias note clarifies routing, but there is no explicit statement of when to prefer this strict variant over the plain kabbalistic or pythagorean life-path tools. Usage is inferable from the system label rather than stated.

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