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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds the 'effective rate' detail, which hints at what is included in the results, but it does not disclose pagination, ordering, date filtering behavior, or whether the 'to' and 'from' parameters are required for scoping. The description does not contradict the annotations.

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 extremely short and front-loaded, with no wasted words. However, it is under-specified rather than efficiently concise; the single phrase 'Transfers with their effective rate.' is grammatically incomplete and omits essential operational context. It earns a 4 for brevity but loses a point for being too sparse to be genuinely useful.

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 tool has two undocumented parameters, no output schema details provided in the description, and a large sibling set with many list_* tools, the description is incomplete. The annotations cover safety, but the description does not explain what 'effective rate' means, how the parameters filter results, or what the response contains. An agent would need to inspect the output schema or guess parameter semantics.

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 must compensate for the undocumented 'to' and 'from' parameters. It does not. The description only mentions 'effective rate' and gives no hint that 'to' and 'from' are likely date or account range filters. With two completely undocumented parameters and no explanatory text, the agent cannot infer their meaning from the description.

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 'Transfers with their effective rate.' identifies the resource (transfers) and a distinguishing attribute (effective rate), but it lacks a specific verb like 'list' or 'retrieve' and does not clarify what the tool actually returns. It is distinguishable from create_transfer and delete_transfer by the resource name, but the description itself is terse and does not explicitly state the operation.

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 provides no guidance on when to use this tool versus alternatives such as list_accounts, search_transactions, or create_transfer. There is no mention of context, exclusions, or prerequisites. The readOnlyHint and idempotentHint annotations imply it is a safe read operation, but the description itself offers no usage direction.

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