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

The annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so the safety profile is covered. The description adds one piece of behavioral value that the annotations do not cover: the response includes the number of articles written so far. Because no output schema exists, that single detail is not enough to explain the overall response shape.

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 a single sentence, front-loaded with the lookup keys, with no filler or redundancy. Everything stated is load-bearing.

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 two-parameter read tool with no nested objects and no output schema, the definition is adequate but not complete: it does not state the at-least-one-identifier constraint or the error behavior for an unknown ID, and it describes only one return field. It is minimally sufficient rather than fully specified.

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?

With schema description coverage at 0%, the description is the only source of meaning for both parameters, and it does identify their roles: the tool looks up a record by order_id or order_uuid. It does not address which identifier is required (both are nullable and required_parameters is 0), whether both may be supplied, or what happens on precedence or mismatch. This partial compensation for the schema gap warrants a mid score rather than a high one.

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 uses a specific verb ("Fetch") plus a specific resource ("a single article order"), so an agent can distinguish it from list_articles_orders purely from the wording. The only gap is that it never names that sibling explicitly, so the read-one-vs-list-many contrast has to be inferred.

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?

There is no explicit when-to-use guidance, no statement of when to prefer list_articles_orders, and no prerequisites. The only implicit hint is that the tool takes an identifier, which is a parameter fact rather than usage guidance.

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