Serpstat MCP Server

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It mentions the API source (Serpstat) and return data types, but lacks critical details such as rate limits, authentication requirements, pagination, error handling, or whether this is a read-only operation. For a data-fetching tool with zero annotation coverage, this is a significant gap.

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 efficiently structured in two sentences: one stating the action and API, and another listing return data and scope. It's front-loaded with the core purpose and avoids unnecessary details, though it could be slightly more polished (e.g., 'Returns' could be integrated into the first sentence).

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 complexity of backlink analysis, no annotations, and no output schema, the description is incomplete. It doesn't explain the format or structure of the returned 'comprehensive summary' (e.g., JSON fields, metrics like DA/PA), nor does it cover behavioral aspects like data freshness or limitations. For a tool with rich sibling alternatives, more context is needed.

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 both parameters thoroughly. The description adds marginal value by clarifying that 'query' is for 'domain or subdomain to analyze' and implying 'searchType' affects scope, but doesn't provide additional syntax or format details beyond what the schema specifies. Baseline 3 is appropriate when schema does the heavy lifting.

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 comprehensive backlinks summary using Serpstat API' with specific resources (referring domains, backlinks count, etc.) and scope (domain or subdomain). It distinguishes from siblings like 'get_active_backlinks' or 'get_referring_domains' by emphasizing a 'comprehensive summary' rather than specific subsets, though it doesn't explicitly name alternatives.

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?

No explicit guidance on when to use this tool versus alternatives like 'get_active_backlinks' or 'get_referring_domains' is provided. The description implies usage for a broad summary, but lacks context on prerequisites, timing, or exclusions, leaving the agent to infer based on sibling tool names alone.

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