Zapmail 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 describes the tool as providing a reputation score for monitoring domain health, which implies a read-only operation, but does not specify authentication requirements, rate limits, error handling, or the format of the returned score. For a tool with zero annotation coverage, this leaves significant gaps in understanding its behavior.

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 concise and front-loaded, with three sentences that directly explain the tool's purpose and benefit. There is no unnecessary repetition or fluff. However, it could be slightly improved by integrating usage guidance more seamlessly, but it remains efficient overall.

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 (7 parameters, no output schema, no annotations), the description is adequate but incomplete. It explains what the tool does but lacks details on behavioral aspects like authentication, error handling, and output format. Without annotations or an output schema, the description should provide more context to fully guide an agent, but it meets a minimum viable level.

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 has 100% description coverage, documenting all 7 parameters (e.g., 'method', 'path', 'query'). The description does not add any parameter-specific information beyond what the schema provides, such as example values or usage context. With high schema coverage, the baseline score is 3, as the description does not compensate but also does not detract.

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: 'provides a reputation score for your domain based on its nameserver reputation' and 'helps you monitor whether your domain's DNS infrastructure is on any abuse lists and assess the overall health of your domain.' It specifies the verb ('provides'), resource ('reputation score for your domain'), and scope ('based on its nameserver reputation'), but does not explicitly differentiate it from sibling tools like 'check_dns_records_13521093e0' or 'get_name_servers_to_connect_domain_13520972e0', which prevents a score of 5.

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 lacks explicit guidance on when to use this tool versus alternatives. It states the purpose but does not mention prerequisites, conditions, or comparisons to sibling tools such as 'check_dns_records_13521093e0' or 'get_name_servers_to_connect_domain_13520972e0'. The phrase 'Invoke this endpoint' is generic and does not provide contextual usage instructions.

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