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

The description adds valuable behavioral context beyond annotations, such as the list of actions, bulk support, and required parameters. It confirms non-destructive nature aligning with annotations. However, it does not cover error handling or side effects.

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 fairly concise and well-structured with bullet points. It front-loads the main purpose and action list, though some redundancy exists in repeated parameter mentions.

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?

Given the tool's complexity (multiple actions, bulk support), the description is comprehensive. It covers all actions, required parameters, and bulk execution. Missing output schema is not an issue as it doesn't explain return values.

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?

With 0% schema description coverage, the description partially compensates by explaining the 'data' parameter structure and mentioning parameter requirements per action. However, the format of 'data' as a string is not fully clarified.

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 states the tool is for creating and operating subscriptions, listing specific actions. However, it does not explicitly differentiate from sibling tools like pagarme_subscriptions_write_add_item, which could cause confusion.

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 parameter requirements for each action (e.g., subscription_id for updates) but lacks explicit guidance on when to use this tool versus alternative sibling tools or when not to use it.

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