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 successfully communicates key behavioral traits: it's a read-only status check (implied by 'Get the current status'), it doesn't consume API credits (explicitly stated), and it serves as a prerequisite check before data requests. However, it doesn't mention potential rate limits, authentication requirements, or error conditions.

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 perfectly concise with three sentences that each serve distinct purposes: stating the tool's function, providing usage guidance, and disclosing cost behavior. There's zero wasted language, and the most important information (what the tool does) comes first.

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 status-check tool with 2 parameters and 100% schema coverage, the description provides excellent context. It explains the tool's purpose, when to use it, and key behavioral aspects (no API credit consumption). The main gap is the lack of output schema, but for a status check tool, the description adequately conveys what information will be returned (parsing status/readiness).

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 fully documents both parameters. The description doesn't add any parameter-specific information beyond what's in the schema (projectId and regionId are clearly defined there). The baseline score of 3 is appropriate when the schema does all the parameter documentation work.

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 with specific verbs ('Get the current status of position updates (parsing)') and identifies the target resource ('rank tracker project and region'). It distinguishes itself from sibling tools by focusing on status checking rather than data retrieval or project management operations.

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 explicitly provides usage guidance: 'Use this to check if data is ready before requesting results.' This gives clear context for when to use this tool (as a readiness check) versus when to use data retrieval tools. It also specifies 'This method does not consume API credits,' which helps with cost-aware decision making.

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