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

The description adds a meaningful permission constraint—only org owner or admin can manage categories—which is not present in annotations. It also implies a mutating operation consistent with readOnlyHint: false. However, it does not describe duplicate-name behavior, whether categories are global, or what happens after creation.

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?

Two concise sentences deliver the core action, applicable resources, and permission requirement without extra filler. The most important information is front-loaded.

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?

The tool is low-complexity with only two simple parameters and no nested objects, and the schema covers the parameter details. The description covers purpose, resource applicability, and authorization, but does not mention return values or duplicate-handling behavior, leaving a minor gap.

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?

Both parameters are fully described in the schema, including the optional color default. The description adds no parameter-specific meaning beyond the schema, so baseline scoring is appropriate.

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 clearly identifies the operation as creating a category, which is a specific verb and resource. It distinguishes the tool from set-like category assignment tools by noting the category is 'usable on watchlist accounts, posts and assets.' It does not explicitly name sibling alternatives, but the action and resource are unambiguous.

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 states a clear usage context: categories are used on watchlist accounts, posts, and assets, and only org owners or admins can manage them. It does not explicitly say when to choose this over set_post_category, set_account_category, or other assignment tools, leaving some routing to inference.

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