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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, so the safety profile is covered. The description adds useful behavioral context: it lists both incoming and outgoing money and returns normalized statuses and amounts. It does not go into pagination, ordering, or how the account is determined, but with annotations and an output schema present, this is adequate.

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 short and front-loaded, with the main purpose stated immediately. The opening 'List transactions' is slightly redundant with the body, and 'Free.' is terse but informative. Overall, every sentence contributes to understanding the tool's scope and behavior.

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 no-parameter, read-only list operation with annotations and an output schema, the description is complete enough. It explains what kind of transactions are included and what normalization to expect. It does not mention alternatives or limitations, but those are not required for this simple tool.

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 has zero parameters, so the baseline is 4. There is no parameter semantics for the description to add, and the schema correctly reflects an empty input. The description focuses on the output scope instead, which is appropriate.

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 states a specific verb and resource: it lists banking transactions for the account, including both incoming and outgoing movements. It also clarifies scope by mentioning on-ramp and off-ramp flows, which distinguishes it from card-transaction or single-transaction siblings like list_card_transactions and get_banking_transaction.

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 clear context about what the tool does and what it covers: banking transactions for the account, with normalized statuses and amounts. It does not explicitly name alternatives or state when not to use it, but the context is specific enough for an agent to know this is the right tool for listing account-level banking transactions.

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