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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile needs no restating. The description usefully discloses the shape of the payload (header, totals, payment, line items), which is genuine added context. It says nothing about behavior when the id does not exist or about auth requirements.

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 terse fragments with the return contents front-loaded, zero padding. The trailing 'GET /sales/{sale_id}' largely restates the name but is cheap and confirms the underlying resource path.

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 enumeration of returned fields is exactly the context an agent needs to know a call is worthwhile. For a single-parameter read-only getter this is close to sufficient; only failure-mode behavior 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 coverage is 100% and the single parameter is documented as 'Sale id.' with an integer constraint. The description adds no format, range, or sourcing guidance beyond that, so the baseline 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 the specific resource (a single sale) and enumerates what it contains: header, totals, payment, line items. This distinguishes it from the sibling list tools (list_open_sales, list_closed_sales) which are plural. The verb is only implied by the name/endpoint, so it stops just short of a full verb+resource statement.

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?

No guidance on when to call this versus the many sibling list/report tools, and no prerequisites or error conditions mentioned. An agent must infer from the name that this is a fetch-by-id operation used when the sale_id is already known.

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