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

The description adds significant behavioral context beyond annotations: it specifies that results come in a results/errors batch shape and may include a provider_incident block when the provider has an incident, warning that credit limits/balances may be unreliable. This alerts the agent to potential data quality issues, which annotations do not cover.

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 front-loaded with the main purpose, and each sentence adds value. It could be slightly more concise by removing the example in parentheses, but overall it is efficient and well-structured.

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 lack of an output schema, the description explains the batch shape and the provider_incident edge case, but does not elaborate on the full account object structure or the fields in creditData. For an agent to use the returned data, additional detail about the object schema would be helpful.

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 single parameter account_ids is described as an array (1–50) and is required. The schema coverage is 0%, so the description fully compensates by specifying the array constraint and the batch nature. It does not explain the format of the strings, but the parameter name is self-explanatory.

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 it returns full account objects with extended creditData per ID, and mentions the batch shape. However, it does not explicitly distinguish from sibling tools like openfinance_list_accounts or openfinance_get_account_balance, though the mention of 'extended creditData' hints at greater detail.

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 guidance is provided on when to use this tool versus alternatives. The description includes a caveat about provider incidents and a batch size constraint, but does not explain the appropriate context for selecting this tool over siblings.

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