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 useful return-content context (items, totals, status) and the backing endpoint, but says nothing about error behavior for an unknown id or about permissions, which is limited added value for a read tool.

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, with the core purpose front-loaded before the endpoint reference. Nothing is wasted, though the raw endpoint path is marginally less useful to an agent than additional semantics would have been.

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 carries the return-shape burden and does it adequately by naming items, totals, and status. For a single-id read tool with full schema coverage, only explicit usage routing 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?

There is only one parameter and schema description coverage is 100%, so the schema already documents the id and its origin. The description adds no format, range, or lookup details beyond that, making the baseline 3 appropriate.

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 ('One order ... by id') and immediately disambiguates the domain term by naming what an order can be (invoice, quote, purchase document). It also declares the payload scope (items, totals, status), which cleanly separates it from cashctrl_list_orders.

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 gives no when-to-use or when-not guidance and does not name an alternative such as cashctrl_list_orders or cashctrl_create_order. The only pointer to the id's origin lives in the schema, not the description, so the agent gets no routing context from the text itself.

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