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

Annotations already signal that this is a mutating operation (readOnlyHint=false, destructiveHint=false), and the description adds no behavioral context beyond that. It does not mention prerequisites, whether duplicate POs are allowed, or what side effects occur in QuickBooks.

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, front-loaded sentence with no filler. It is appropriately sized for a tool whose detailed parameter guidance already lives in the schema.

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?

The schema covers entity complexity and company selection well, and annotations cover the basic safety profile. However, the overall definition omits what the tool returns, prerequisites, and when to choose a purchase order over sibling purchase/bill tools, leaving some gaps for a create operation with no output schema.

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 100%, and the entity parameter description is unusually detailed, including sensitive-data warnings and a specific QuickBooks error scenario. However, the tool description itself adds no additional parameter meaning, so the baseline of 3 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 names a specific verb and resource: it creates a purchase order in QuickBooks Online. This is unambiguous and distinguishes it from get/search/update/delete siblings, though it does not explicitly contrast it with similar create tools such as create_purchase or create_bill.

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 create_purchase, create_bill, or create_vendor_credit. There are no alternatives, exclusions, or contextual conditions, so the agent must infer usage solely from the tool name.

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