books_mark_bill_as_open

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

With no annotations, the description does not disclose any behavioral details beyond the action itself. It does not state whether the bill must be in a particular state, whether it reopens previously paid or voided bills, or what the result or response is.

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 a single short sentence, making it concise and front-loaded, but it is under-specified rather than efficiently detailed. Minimalism here sacrifices critical context.

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 state-changing tool with no annotations and no output schema, the description is too thin. It does not define 'open', the scope of the change, or the expected response, leaving the agent to guess from the name alone.

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 only parameter bill_id is not described at all; the schema merely lists it as a required string. Since schema description coverage is 0%, the description fails to explain the format, meaning, or how to obtain the ID.

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 uses the imperative verb 'mark' with a specific resource ('a bill') and target state ('open'), clearly indicating a status-change operation. It distinguishes from sibling tools like books_mark_bill_as_paid or books_void_bill by the state being set, although the meaning of 'open' is left implicit.

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 no guidance about when to use this tool versus alternatives such as books_mark_bill_as_paid, books_void_bill, or books_mark_purchase_order_as_open. No preconditions, typical workflows, or exclusions are mentioned.

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