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

Annotations indicate readOnlyHint=true and idempotentHint=true, consistent with a list operation. The description adds bulk support via subscription_ids and item_ids, but the multiple-action listing contradicts the flattened action claim, creating confusion about the tool's behavior. The description does not explain how the 'data' parameter is used for filtering.

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 verbose and includes extraneous actions, making it cluttered. The front-loading with 'Assinaturas no Pagar.me V5.' adds little value. The structure lacks brevity and clarity.

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 no output schema and 8 parameters, the description should provide complete context for usage. It fails to explain how to construct the 'data' parameter for filtering, does not mention required vs optional parameters, and leaves users guessing about correct invocation. The multiple-action confusion further undermines completeness.

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 mentioning page, size, and bulk fields (subscription_id, item_ids etc.). However, it does not explain the 'data' parameter structure (e.g., how to pass customer_id, plan_id) or the 'account' parameter, leaving critical semantics unclear.

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 'list: lista assinaturas' indicating the tool lists subscriptions, which is clear. However, it also lists other actions (get, items, cycles, usages) causing confusion about the tool's actual purpose. The '[Flattened action: list]' note attempts to clarify but the overall description is muddled.

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 guidance on when to use this tool versus sibling tools like pagarme_subscriptions_get or pagarme_subscriptions_items. The mentions of 'get' and 'items' within the description imply alternative actions but do not provide criteria for choosing among them.

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