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 is covered. The description adds no behavioral context beyond restating the HTTP verb and path, which duplicates rather than enriches the structured metadata.

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 purpose front-loaded and no wasted prose. The trailing 'GET /products/{product_id}' is largely redundant with the schema's path knowledge, keeping it just below a 5.

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 one-parameter read tool with annotations covering safety and no output schema, the description is nearly sufficient; it tells an agent which id to supply. It could note what a product record contains, but that gap is minor for this simple lookup.

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% for the single product_id parameter, so the schema already carries the semantics; baseline of 3 applies. The description adds only marginal meaning ('the id you registered it under') without any format or constraint guidance.

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 (Get) and resource (one product record) and clarifies the singular scope ('one product record by the id'), which implicitly distinguishes it from list_products. It does not, however, name a sibling explicitly, so it stops short of the 5 tier.

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 the id you registered it under' implies the usage condition (single-record lookup when you already hold an id), but there is no explicit when-to-use, when-not-to-use, or named alternative such as list_products.

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