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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description adds only that the operation reads from QuickBooks Online by Id, which is essentially the core behavior already evident from the name. No extra behavioral details such as error handling or response format are disclosed.

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?

A single, concise sentence that front-loads the operation, resource, and lookup key. There is zero redundancy or irrelevant detail.

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?

For a simple read-by-Id tool with full schema coverage and annotations declaring the operation read-only and non-destructive, the description is nearly complete. The only minor gap is that, with no output schema, the return payload is not described, but the semantics of a 'get' tool make this predictable.

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 'id' and 'company' parameters are already documented in the schema. The description's 'by Id' phrasing reinforces the importance of the id parameter but adds no new semantic value beyond what the schema provides.

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 states a specific verb ('Get'), a specific resource ('a single journal entry'), and a precise scope ('from QuickBooks Online by Id'). It clearly distinguishes this tool from search_journal_entries (which searches multiple entries) and get_journal_report (which produces a report).

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 phrase 'by Id' strongly implies the tool should be used when the agent already knows the specific QuickBooks Id of the journal entry. However, it does not explicitly name alternatives like search_journal_entries or state when not to use this tool, so some inference is required.

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