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

Annotations already declare readOnlyHint=true, so the safety profile is covered. The description adds the API endpoint and the 'single' constraint, but it does not disclose response format, potential errors, or authorization expectations. This is adequate but not rich behavioral context beyond the annotation.

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 one compact sentence with the core function front-loaded, followed by the precise API endpoint. Every word earns its place, and there is no redundant or filler information.

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 single-parameter read operation with readOnlyHint=true and full schema coverage, the description is largely complete. It lacks an explicit note about return value shape, but the task is simple enough that the endpoint and resource name sufficiently guide invocation. Slightly more context about response could push it to 5.

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%, and the order_id parameter is already described as a UUID. The description's mention of 'by id' reinforces the schema but adds no new semantic detail such as format constraints or where to find the id. Baseline 3 is appropriate since the schema carries the parameter documentation.

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 lab-test order'), and the lookup criterion ('by id'). It also includes the exact endpoint path, making the tool's function unambiguous and easily distinguishable from sibling list/result tools.

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 implies usage: call when you need one lab-test order by its id. However, it provides no explicit guidance about when not to use it, such as preferring vital_list_orders for multiple orders or vital_get_order_results for results data. The usage context is clear but under-specified relative to the many sibling tools.

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