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

The annotations already declare readOnlyHint=true and destructiveHint=false, so 'Read only' restates structured data rather than adding to it. The real value it contributes beyond annotations is the enumeration of possible account states, which matters because there is no output schema — but it says nothing about auth requirements or what happens when the account was never opened.

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?

A single compact sentence that front-loads the resource and then the possible values, with no filler. Every clause earns its place.

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?

With zero parameters, no output schema, and annotations already covering the safety profile, an agent has nearly everything it needs: what the tool reads and what values to expect. Only the preconditions (account existence, trainer authentication) are left unstated.

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 tool takes no parameters, so there is nothing for the description to disambiguate. Baseline 4 applies; the scope note ('the trainer's') implicitly confirms there is no account ID or filter to supply.

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?

States a specific resource ('the trainer's digital account') with the provider named (Asaas) and enumerates the exact statuses returned (approved, pending documents, not opened). It is clearly distinguishable from balance/statement siblings by being a state check rather than a numeric or transactional read, though it never names those siblings explicitly.

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 says nothing about when to call this versus get_digital_account_balance, get_digital_account_statement, or get_receiving_status. The only usage signal is the trailing 'Read only', which is guidance about side effects, not about selection.

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