Serpstat MCP Server

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. While it mentions what data is returned (visibility, traffic, relevance), it doesn't address critical aspects like whether this is a read-only operation, potential rate limits, authentication requirements, data freshness, or error conditions. For a tool with no annotation coverage, this leaves significant behavioral gaps.

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?

The description is a single, efficient sentence that front-loads the core purpose and key return data. Every word earns its place with no redundancy or unnecessary elaboration, making it easy for an agent to quickly understand the tool's function.

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?

Given the tool's moderate complexity (4 parameters, nested objects, no output schema, and no annotations), the description is minimally adequate. It states what the tool does but lacks crucial context about when to use it, behavioral characteristics, and how it differs from similar sibling tools. The absence of output schema means the description should ideally provide more detail about return values.

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 description coverage is 100%, so the schema already documents all parameters thoroughly. The description doesn't add any meaningful parameter semantics beyond what's in the schema - it mentions 'domain' and the returned data fields but provides no additional context about parameter interactions, default behaviors, or practical usage examples.

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 clearly states the tool's purpose: 'Get a list of competitor domains for a given domain, including visibility, traffic, and relevance.' It specifies the verb ('Get'), resource ('competitor domains'), and key data points returned. However, it doesn't explicitly differentiate from sibling tools like 'get_url_competitors' or 'get_keyword_competitors', which appear to serve similar competitive analysis functions.

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?

The description provides no guidance on when to use this tool versus alternatives. With sibling tools like 'get_url_competitors' and 'get_keyword_competitors' available, there's no indication of whether this tool is for domain-level analysis specifically, nor any prerequisites or context for its application.

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