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

Annotations already declare read-only, idempotent, open-world, non-destructive behavior. The description adds useful context beyond that: the data is 'last-known' and 'freshness-stamped,' it costs 2 credits for developer API keys with no charge when no data is returned, and it includes the brand's own DNA profile.

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?

Three tightly packed sentences: purpose and return contents first, then freshness, then billing. No sentence is filler.

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 one-parameter read tool with rich annotations and a fully documented schema, the description covers purpose, return fields, freshness, and billing. It is slightly incomplete on prerequisites, such as whether the brand must already be tracked before competitors are available.

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% for the single 'domain' parameter, and the schema already gives an example. The description says the data is 'for a domain' but adds no format or edge-case semantics beyond the schema.

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 states a specific resource (DNA competitor set: closest competing brands for a domain) and lists the returned fields, so the agent knows exactly what it retrieves. It does not explicitly contrast with competitor-related siblings like get_competitor_moves_feed or get_brand_radar_assortment_gaps, which keeps it from a 5.

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 use this tool versus alternatives such as check_brand_data_coverage, request_new_brand_monitoring, or the other competitor-analysis tools. The billing sentence is pricing context, not usage guidance.

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