Compare brands

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

The readOnlyHint annotation already tells the agent this is a safe read, so the bar is lower. The description adds one real behavioral constraint — 'two or more brands' as a minimum arity — but says nothing about what the comparison covers, how brands are identified, or what comes back.

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 front-loaded sentence with no filler, and the key constraint (two or more brands) appears immediately. It is efficient, though arguably under-specified rather than genuinely concise.

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 zero-parameter tool with no output schema, the description carries the entire burden of explaining input shape and result content, and it does neither. An agent cannot tell how to pass brands or what a 'comparison' returns.

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 zero declared properties, the baseline is 4. The description is the only hint about inputs, implying at least two brand identifiers must be supplied, but it does not explain the argument form for a schema that simply accepts additionalProperties.

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 names a specific verb and resource ('Compare the advertising of two or more brands side by side'), so an agent knows the operation is a read-only multi-brand comparison. It does not distinguish itself from siblings such as find_competitors, search_brands, or get_brand_ads, which are adjacent in purpose.

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 guidance on when to choose this tool versus alternatives like find_competitors or get_brand_ads, nor any precondition (e.g., brands must already be saved via save_my_brand/add_brand). Usage is only implied by the name.

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