upgrade

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

With no annotations provided, the description carries the full burden. It mentions the tool 'Returns the payment links and what to do after paying,' which gives some behavioral insight. However, it does not disclose whether the upgrade is immediate, idempotent, or requires authentication, nor what happens to existing subscriptions.

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?

The description is a single sentence that is concise and front-loaded with the core purpose ('The subscription'). It avoids fluff but is slightly informal in phrasing ('every one of 1,245 sites'), which adds specificity but could be seen as unnecessary detail.

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 zero-parameter tool with no output schema, the description covers the basics: what it does and what it returns. However, it lacks details on the process flow after payment, any prerequisites, or the relationship to sibling tools like 'activate' or 'account', which may be needed for correct usage in complex scenarios.

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?

The input schema has 0 parameters, so the description doesn't need to document them. The description adds value by explaining that the tool returns payment links and post-payment steps, which is beyond what an empty schema conveys.

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 states that the tool relates to upgrading 'the subscription' for sites and engine, with billing periods. It is clear enough for a tool named 'upgrade', distinguishing it from siblings like 'activate' or 'account', though it does not explicitly name a sibling alternative.

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 explicit when-to-use or when-not-to-use guidance is provided. The description does not mention prerequisites (e.g., requires an existing account) or situations where 'activate' or 'account' would be more appropriate. The context is implied by the word 'upgrade' but not elaborated.

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