Create subscription localization

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

Annotations already indicate a write operation (readOnlyHint=false). The description adds behavioral context beyond annotations by noting the per-locale uniqueness constraint ('Add one per locale') and the consequential requirement ('Required for submission'). It does not contradict annotations.

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 sentences, immediately starting with the action verb, with no redundant phrasing. Every word contributes to the purpose and context.

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?

For a simple 4-parameter create tool with no output schema, the description covers the essential 'what', 'when' (per locale), and 'why' (required for submission). It lacks detail on response format or error conditions, but these are not critical for selection. Overall, adequately 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 100%, so the baseline is 3. The description does not add substantial meaning beyond the schema; it loosely references 'name/description' and 'locale' but does not provide new format, syntax, or relationship details.

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 uses the specific verb 'Create' with the resource 'localized name/description for a subscription', which clearly distinguishes it from sibling tools like create-subscription or create-subscription-price. It also adds the constraint 'Add one per locale', further clarifying the tool's specific scope.

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 provides clear context by stating 'Add one per locale' and 'Required for submission', indicating when and why to use the tool. However, it does not explicitly mention alternatives or exclusions, so it falls short of a perfect 5.

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