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

No contradiction with annotations, which already declare readOnly/idempotent/non-destructive/closed-world. The description adds genuinely useful operational context the annotations do not carry: the endpoint path, required inputs, and a 10-credit Tier 1 cost. It says nothing about computation inputs beyond name/date or any output traits, but the output schema covers returns.

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?

Punchy and front-loaded: the functional sentence leads, and bracketed metadata follows in a scannable block. Every line carries information, though the '[Group:]' line partially duplicates the school already stated in the first sentence.

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 and safety annotations covering the risk profile, the main completeness gap is the absence of any routing guidance in a family of ~10 near-duplicate pinnacle tools. Operational facts (endpoint, cost, required fields) are present, so the definition is adequate but leaves the agent to guess which sibling applies.

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 50%: 'fields' and 'precision' are documented in the schema itself, while 'name' and 'date' have only length/pattern constraints. The description merely restates the two required params ('Required: name, date') and adds no format or behavior detail beyond the schema, which is the expected baseline here.

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 identifies the school as 'Kabbalistic (phonetic) system', which separates it from the chaldean/pythagorean/vedic pinnacles siblings. It does not, however, explicitly distinguish itself from the near-identical 'kabbalistic_strict_pinnacles' variant, so a qualifier about the phonetic vs strict distinction is missing.

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 lists required parameters and cost but never says when to choose this tool over the many sibling pinnacle calculators. There are no usage conditions, prerequisites, or named alternatives despite an extremely crowded sibling namespace.

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