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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is fully covered. The description adds nothing beyond that: no mention of what happens when the id does not exist, no error behavior, no indication of what a brand asset contains. With annotations carrying the weight a 2 is fair for a description that contributes no behavioral context of its own.

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?

A single short sentence with the key qualifier ('by id') up front and zero padding. It is arguably too sparse rather than too long, but there is no structural waste.

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 trivial single-id read with annotations covering safety and a fully documented parameter, the essentials are present. However, with no output schema the description gives no hint of the returned asset's shape or the not-found behavior, which is the main remaining gap.

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?

One parameter at 100% schema description coverage, so the schema already explains 'id'. The description restates it ('by id') without adding format, source, or validation guidance. Baseline 3 is 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 ('Read one brand_assets by id') and the 'one ... by id' phrasing implicitly separates it from the sibling brand_assets_list. The odd resource name aside, an agent can tell what it returns and at what granularity, though sibling differentiation is only implied rather than stated.

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 inferable: call this when you have a known id, otherwise use brand_assets_list. But the description never names the list sibling or states the condition explicitly, so the routing decision is left to inference from the name pattern.

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