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

Annotations already declare the safety profile (readOnly=false, destructive=false, openWorld=false), so the bar is lower. The description still adds real value beyond them: it discloses the return payload ('the saved record with its SyncToken'), which matters for chaining into update_transfer, and warns against sending government identifiers, birth dates, or card-processing details.

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?

Three short sentences, front-loaded with the core action, and each carries information. The second sentence lightly restates the first ('recording a transfer between accounts'), so it is efficient but not maximally tight.

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?

There is no output schema, so the description correctly covers the return value (saved record plus SyncToken), and the nested entity object's required fields and the sensitive-data restriction are covered in the schema text. For a create tool whose annotations cover the mutation profile, this is close to complete; only explicit alternative-tool guidance is missing.

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, including the required FromAccountRef/ToAccountRef/Amount subfields and the constraint that the accounts must differ. The description adds nothing further about parameters, 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?

States a specific verb and resource ('Create a transfer in QuickBooks Online') and defines the domain concept ('An accounting entry recording a transfer between accounts'). It also draws a useful negative boundary ('It does not move money between bank accounts'), though it never names the nearby siblings (create_deposit, create_journal_entry, create_payment) an agent might confuse it with.

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?

Usage is only implied: the negative clarification about not moving money hints at when this is and isn't appropriate, but there is no explicit when-to-use, no prerequisites, and no routing to an alternative tool (e.g., journal entry vs. transfer). Adequate but with clear gaps.

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