Zapmail 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 states the tool updates DNS records but fails to describe critical behaviors such as required permissions, whether updates are destructive or reversible, rate limits, or error handling. This is inadequate for a mutation tool with zero annotation coverage.

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 with two short sentences, but the second sentence ('Invoke this endpoint.') is redundant and adds no value. It could be more efficient by combining or omitting unnecessary phrasing, though it's generally well-structured.

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 updating DNS records (a mutation operation), no annotations, no output schema, and 7 parameters, the description is incomplete. It lacks details on behavioral traits, usage context, and expected outcomes, making it insufficient 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?

Schema description coverage is 100%, so the schema fully documents all 7 parameters. The description adds no additional meaning beyond the schema, such as explaining how parameters like 'method' or 'path' interact with DNS updates. Baseline 3 is appropriate when the 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 states the tool updates DNS records for a domain, which provides a basic purpose. However, it's vague about what specific DNS record types or fields can be updated, and it doesn't distinguish itself from sibling tools like 'add_dns_records_13629231e0' or 'delete_dns_records_14109023e0' in terms of scope or operation.

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 offers no guidance on when to use this tool versus alternatives. It doesn't mention prerequisites (e.g., domain ownership), exclusions, or compare it to siblings like 'add_dns_records_13629231e0' for creation or 'delete_dns_records_14109023e0' for deletion, leaving usage unclear.

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