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

The description mentions 'create' and 'deactivate' actions, implying modification and potential state changes, but it does not explain side effects, permissions, or what happens during bulk execution (checkout_ids). Annotations (readOnlyHint=false, destructiveHint=false) are minimally consistent, but the description adds little valuable behavioral context beyond the schema.

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 cluttered with extraneous information (listing multiple actions, bulk support) that is not directly relevant to the tool's primary function. The '[Flattened action: create]' note adds confusion rather than clarity. A concise, focused description would be more helpful.

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?

The description lacks essential details: no output schema, no explanation of return values or success/failure indicators, no indication of required parameters for the create action, and no error handling information. For a tool with zero parameter coverage, this is a significant gap.

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 0%, so the description must add meaning. It states 'cria um checkout (passe o objeto 'checkout')' but does not describe the structure of the 'checkout' object or clarify that 'checkout_id' and 'checkout_ids' are irrelevant for the create action. This omission leaves the agent uncertain about which parameters to use.

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 lists three actions (create, get, deactivate) but the tool is named for 'create' and includes a note '[Flattened action: create]', creating confusion about which actions this tool actually performs. It does not clearly state that the tool is solely for creating checkouts, and the inclusion of other actions makes the purpose vague.

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?

There is no guidance on when to use this tool versus its siblings (pagseguro_checkouts_get, pagseguro_checkouts_deactivate). The description even suggests this tool includes get and deactivate actions, contradicting the existence of separate sibling tools for those purposes.

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