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

The annotations already establish safe read-only, idempotent behavior. The description adds valuable context beyond that: ordering by evaluation sequence and the shape of returned information, including last-used timing and frequency. It could say more about completeness or pagination, but it is strong for a zero-parameter list operation.

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?

It is front-loaded and compact, with each phrase adding information about ordering or returned fields. The trailing word 'Free' is slightly cryptic without more context, keeping it from a 5.

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 with rich annotations and no output schema, the description covers the essential return contents and ordering. It does not discuss pagination or whether all rules are always returned, but the core information an agent needs is present.

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?

There are no parameters, which sets the baseline at 4. The description adds no parameter detail because none is needed.

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 identifies the resource as bank rules and adds meaningful scope: they are returned in evaluation order with conditions, booking targets, and usage recency. It does not explicitly contrast with books_apply_bank_rules or books_save_bank_rule, but the read-only listing purpose is unmistakable.

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?

Usage is implied by the listing framing and the read-only annotation, but there is no explicit guidance on when to call this versus applying, saving, or deleting rules. With zero parameters the call is simple, so the omission is minor.

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