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

Annotations already declare readOnlyHint=false, destructiveHint=false, and openWorldHint=false, covering the safety profile. The description adds one behavioral fact beyond annotations -- that the call returns the saved record with its SyncToken -- which matters since there is no output schema, but it omits auth/company-connection requirements and any guidance on what the SyncToken is used for.

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?

Two short sentences, front-loaded with the action and followed by the return behavior. Zero filler or redundancy.

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?

With 100% schema coverage covering the nested entity and company selection, and annotations covering the safety profile, the main remaining gap was return behavior -- which the description addresses briefly via 'the saved record with its SyncToken' in the absence of an output schema. It could say more about the returned object's shape, but it is adequate.

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%: the 'entity' parameter carries a detailed warning against sending SSNs, tax IDs, birth dates, or card details, and 'company' explains the connected-company selection. The description adds nothing beyond the schema, so the baseline 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?

States a specific verb and resource ('Create an employee in QuickBooks Online') and names the target system, so an agent can distinguish it from update_employee or search_employees. No explicit sibling differentiation is needed beyond the resource name, but none is provided.

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 offers no when-to-use guidance, prerequisites, or alternatives (e.g., when to use update_employee vs create_employee, or the need for a connected company). Usage is only implied by the verb.

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