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

Annotations already declare readOnly/idempotent/non-destructive, so the safety profile is covered. The description usefully adds the 10-credit cost and Tik 1 tier, which the annotations do not carry, plus the group membership. It stops short of noting determinism or caching behavior, but the cost disclosure is real 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?

Front-loaded with the core action and kept to two short lines plus bracketed metadata. Efficient, though the 'Pythagorean system' repeat of the group tag is mild redundancy.

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?

Output schema exists, so return-value explanation is unnecessary. The description covers system, deliverable, and cost. The main gap is the absence of any routing guidance among the many numerology siblings, but for a straightforward calculation tool this is close to 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' are not described anywhere. The description adds no parameter guidance, so an agent must infer that name/date are the birth-data inputs. Baseline 3 is appropriate given the schema does half the work.

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 and resource: 'Calculate four Pinnacle cycles with their age boundaries', and adds a gloss ('life chapters of opportunity'). The 'Pythagorean system' tag distinguishes it from the Chaldean/Kabbalistic/Vedic pinnacles siblings, though it does not name them explicitly.

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?

No when-to-use, when-not-to-use, or alternative guidance. With ~70 sibling tools spanning multiple numerology systems, the description never tells the agent why to pick Pythagorean pinnacles over the other pinnacles variants.

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