FetchSERP 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. It only states what the tool does ('Get Moz domain analysis data') without mentioning any behavioral traits such as whether it's read-only, requires authentication, has rate limits, or what the output format might be. This leaves significant gaps in understanding how the tool behaves.

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 extremely concise with a single sentence ('Get Moz domain analysis data'), which is front-loaded and wastes no words. It efficiently conveys the core purpose without unnecessary elaboration, making it easy to parse quickly.

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 lack of annotations and output schema, the description is incomplete for a tool that likely returns complex analysis data. It doesn't explain what 'Moz domain analysis data' includes (e.g., metrics, reports, or insights), leaving the agent uncertain about the tool's capabilities and how to interpret results. This gap is significant for effective tool selection and invocation.

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 description adds no meaning beyond what the input schema provides. The schema has 100% coverage with a clear description for the single parameter ('domain': 'The domain to analyze'), so the baseline score is 3. The tool description does not elaborate on parameter usage, constraints, or 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 'Get Moz domain analysis data' states a clear verb ('Get') and resource ('Moz domain analysis data'), but it's vague about what specific analysis data is provided. It doesn't distinguish this tool from sibling tools like 'get_domain_info' or 'get_domain_ranking', which might also provide domain-related data from Moz or other sources.

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 multiple sibling tools related to domain analysis (e.g., 'get_domain_info', 'get_domain_ranking', 'scrape_domain'), there's no indication of what makes this tool unique or when it should be preferred over others, leaving the agent to guess based on the tool name alone.

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