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

No annotations are supplied, so the description carries the full burden. It discloses read-only behavior, account scoping, and authentication prerequisites, which is valuable context beyond what the empty schema provides. It does not mention pagination, response shape, or failure behavior, which prevents a higher score.

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 sentences with no filler: the action and resource are front-loaded, followed by useful scoping and auth details. Every sentence contributes value without redundancy.

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 account-scoped listing tool, the description covers purpose, returned fields, read-only nature, and setup prerequisites. It lacks an explicit output schema description or mention of pagination/limits, but the core information needed to call it correctly is present.

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?

The input schema is empty with 0 parameters and schema description coverage is 100%, so there are no parameter semantics to clarify. The zero-parameter baseline of 4 applies, and the description's context about account scoping and auth explains why no arguments are needed.

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 ('List'), a clear resource ('sites/products tracked on the connected Sellular account'), and enumerates the returned aspects: type, category, status, and Sellular badge verification. The 'Account-scoped' phrasing differentiates it from sibling list tools such as list_public_listings and list_directory_listings.

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?

Provides clear context by noting that the operation is account-scoped, read-only, and requires MCP_API_KEY and MCP_ACCOUNT_EMAIL to be configured. However, it does not explicitly tell the agent when to prefer this tool over sibling listing tools or when not to use it, leaving routing to be inferred.

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