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

The annotations already indicate this is a write operation (readOnlyHint false) and not destructive (destructiveHint false). The description adds the specific behavioral detail that it books a valuation difference, and the plan/region constraint, which are not covered by annotations. It does not disclose potential side effects like requiring specific permissions or creating an irreversible transaction, but the added context is meaningful.

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 sentence that front-loads the action and then efficiently adds the effect and the usage constraint. There is no redundancy or fluff; every part earns its place.

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 description includes the critical region/plan constraint, and the schema thoroughly covers the complex nested entity parameter. There is no output schema, so no return-value details are needed. It does not mention prerequisites like having inventory items set up, but the core information an agent needs to decide and invoke the tool 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?

Schema description coverage is 100%, so both parameters are fully documented in the schema. The entity parameter has a detailed description explaining the structure and required fields. The tool description does not add any parameter-specific guidance beyond what the schema already provides, so the baseline of 3 applies.

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 states the action (create an inventory adjustment), the resource (inventory adjustment in QuickBooks Online), and the specific effect (changes quantity on hand and books valuation difference). It also includes a scope constraint (US companies on Plus or Advanced only), which distinguishes it from other create tools and clarifies its applicability.

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 a concrete usage condition (US companies on Plus or Advanced) and implies the purpose of adjusting inventory quantities. It does not explicitly mention alternatives like update_inventory_adjustment, but the create vs. update distinction is implicit. The constraint is a strong usage guideline, though exclusions are not stated.

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