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

Annotations already declare readOnly, idempotent, non-destructive and closed-world behavior, so safety is covered. The description adds that the output is four cycles with age boundaries and discloses a cost (10 credits, Tier 1), which is genuinely useful context not present in the structured fields, but says nothing about the phonetic name requirement or the response shape beyond the cycle count.

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 description is compact and front-loads the core action before the group/cost metadata lines. Every sentence is short and earns its place, though the bracketed metadata adds little for tool selection.

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 annotations cover the safety profile. However, for a cost-bearing tool sitting in a dense family of near-identical numerology tools, the absence of usage differentiation and required-parameter semantics leaves clear gaps.

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 description coverage is only 50%: the two optional params (fields, precision) are documented, but the two required params (name, date) have no schema description. The description does not compensate by explaining why a name is needed for a phonetic system or the expected date format, leaving the most important inputs unexplained.

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 gives a specific verb and resource ('Calculate four Pinnacle cycles with their age boundaries') and names the system ('Kabbalistic (phonetic)'), which distinguishes it from the Chaldean, Pythagorean and Vedic pinnacle siblings. It does not, however, separate itself from close relatives like astroway_numerology_kabbalistic_strict_pinnacles or astroway_numks_pinnacles, which share the same method family.

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 guidance on when to choose this tool over the many sibling pinnacle and numerology tools, nor any stated prerequisites beyond the required name/date. The agent must infer selection purely from the tool name.

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