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. It states the tool retrieves best practices but doesn't disclose behavioral traits such as whether it's a read-only operation, if it requires authentication, rate limits, or what the output format looks like. This leaves significant gaps for a tool that likely provides structured advice.

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 a single, efficient sentence that front-loads the core purpose without unnecessary words. It's appropriately sized for a simple retrieval tool, making it easy for an agent 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 no annotations and no output schema, the description is incomplete. It doesn't explain what the tool returns (e.g., structured tips, markdown, list), behavioral aspects, or how parameters affect results. For a tool with 2 parameters and likely complex output, this leaves the agent underinformed.

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 the two parameters (category and endpoint). The description adds no additional meaning beyond implying the tool covers API best practices broadly, which aligns with the schema but doesn't compensate with extra details like examples or usage tips.

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 action ('Get') and resource ('comprehensive best practices for using the Zapmail API effectively'), specifying it's about API usage guidance. It distinguishes itself from most siblings (e.g., get_api_info, get_api_scenarios) by focusing on best practices rather than general info or examples, though the distinction could be more explicit.

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 guidance is provided on when to use this tool versus alternatives like get_api_info or get_api_scenarios. The description implies it's for API effectiveness, but there's no explicit context, exclusions, or comparisons to help the agent choose appropriately among similar tools.

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