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 genuinely new behavioral context by saying the response bundles colors, sizes and SKUs, but says nothing about behavior for a nonexistent or out-of-range id.

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, front-loaded with the resource and followed by the response contents, with no filler. The trailing GET path partially duplicates what the name already conveys but does helpfully anchor the tool to an endpoint.

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 single-parameter read tool with rich annotations, the description covers resource scope and response shape adequately. The absence of an output schema means the brief field list (colors, sizes, SKUs) is doing real work, though error behavior remains unstated.

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 integer parameter is documented in the schema, so the baseline is 3. The description's 'numeric id' confirms the type but adds no format, range, or sourcing detail beyond what the schema already states.

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 retrieval verb ('One catalog product by numeric id') plus the payload it returns (colors, sizes, SKUs), and names the endpoint. It clearly contrasts with list-style siblings like customcat_list_catalog, but does not explicitly distinguish itself from customcat_get_catalog_sku or customcat_get_product.

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?

Usage is only implied: fetch a single catalog product when you already have its numeric id. There is no statement about when to prefer customcat_get_catalog_sku or customcat_get_product, nor any precondition or error-case guidance.

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