CreateCategoryGroup

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

Annotations already declare the operation is a non-readonly, non-idempotent, open-world write (readOnlyHint=false, idempotentHint=false). The description adds no behavioral context beyond this — no mention of side effects on existing groups, ordering, or what happens on duplicate names, so it contributes nothing the structured fields don't already say.

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?

A single front-loaded sentence with zero waste, but it is arguably too thin for a mutation tool whose siblings are easy to confuse it with. It is concise without being informative.

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 described, and annotations plus full schema coverage carry the safety and parameter load. Still, for a create/write tool with many sibling create/update tools, the description lacks any disambiguating context.

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 100%, so both parameters (name, plan_id with its 'last-used' default and ListPlans pointer) are fully documented in the schema. The description adds no parameter meaning beyond that, so the baseline 3 applies.

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 clear verb+resource ('Create a category group'), so an agent knows exactly what the tool does. It does not, however, differentiate itself from close siblings like Ynab_CreateCategory or Ynab_UpdateCategoryGroup in terms of scope or behavior.

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 guidance on when to use this versus CreateCategory, UpdateCategoryGroup, or ListCategories, and no prerequisites or exclusions are given. The agent must infer usage entirely from the name and sibling list.

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