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

Annotations already indicate read-only, idempotent, and non-destructive behavior, and the description is consistent with them. It adds useful behavioral context by documenting bulk support via subscription_ids and clarifying that the effective action is 'list'.

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 compact, front-loaded with the resource and purpose, and uses a clear bullet structure. Each sentence adds useful information without restating schema types or repeating the tool name.

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 10-parameter read tool with no output schema and no property descriptions, the description covers the main invocation paths but leaves gaps: response shape, pagination defaults, ordering syntax, and the role of the 'account' parameter are not explained. It is adequate for basic list usage but not fully 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 description coverage is 0%, so the description carries the burden of explaining parameters. It enumerates most filters (status, payment_method, current_situation, search, ordering, limit, page), maps subscription_id to the get action, and mentions subscription_ids for bulk. However, it omits the 'account' parameter and does not explain search/ordering formats or defaults.

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 reads Cakto subscriptions and explicitly identifies the main action as 'list: lista assinaturas' with relevant filters. It is clear about the resource and operation, though it does not explicitly differentiate itself from the sibling cakto_subscriptions_get.

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 gives action-level guidance: list for listing with filters, get for a single subscription requiring subscription_id, and bulk execution with subscription_ids. However, since the tool is flattened to 'list' and a dedicated sibling cakto_subscriptions_get exists, it does not explicitly tell the agent to use that sibling for single-subscription reads, so alternative selection is only implied.

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