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

Annotations already declare destructiveHint=true, readOnlyHint=false, and openWorldHint=false, so the safety profile is largely covered. The description adds only the return shape (saved record plus SyncToken), and is silent on the irreversibility, permission requirements, and side-effect account creation that the schema's entity description warns about.

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 tight sentences with the action front-loaded and the return value second; every sentence earns its place. It is slightly under-scaled for a destructive, irreversible operation, but there is no 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 no output schema, the description usefully states what is returned, and the schema's entity description carries the destructive/irreversible warnings and PII constraints. For a two-parameter tool with nested object input and full schema coverage, this is nearly complete; only permission/prerequisite context for the calling company is unstated.

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 the baseline is 3. The description supplies no parameter detail at all; the meaningful semantics (QBO v3 TaxAgency shape, PII restrictions, irreversibility) come entirely from the schema's entity description.

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 gives a specific verb+resource ("Create a tax agency in QuickBooks Online") and states the return value, so the agent knows exactly what is produced. It does not, however, distinguish itself from nearby siblings like create_tax_service or create_tax_code, so an agent must infer the boundary from the entity type alone.

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 body contains no when-to-use or when-not-to-use guidance. The critical "Only create one when the user has asked for it" caveat lives in the schema's entity field description, not in the tool description, and no alternative tools (e.g. search_tax_agencies, get_tax_agency) are referenced.

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