Zapmail MCP Server

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

No annotations are provided, so the description carries full burden. It mentions 'create' (implying mutation) and a uniqueness constraint, but lacks critical behavioral details: required permissions, rate limits, error conditions, or what the response contains. For a mutation tool with zero annotation coverage, this is insufficient.

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 brief but includes redundant phrasing ('Invoke this endpoint') and could be more front-loaded. It efficiently covers purpose and a constraint in two sentences, but the last sentence adds no value, reducing overall efficiency.

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 mutation tool with no annotations and no output schema, the description is incomplete. It lacks details on authentication, response format, error handling, and how parameters map to the creation process. Given the complexity (7 parameters, nested objects), more context is needed for effective use.

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 documents all 7 parameters. The description adds no parameter-specific information beyond implying a workspace name is needed for uniqueness. It doesn't explain which parameters are relevant for creation versus overrides, resulting in baseline adequacy.

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: 'create a new workspace for your Zapmail account' with specific details about what workspaces can hold (domains, mailboxes, user-specific settings) and a uniqueness constraint. It distinguishes from siblings like 'list_workspaces' and 'update_workspace' by focusing on creation, though it doesn't explicitly contrast with them.

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 provides minimal guidance: it only states 'Use this endpoint to create a new workspace' without specifying when to use it versus alternatives like 'update_workspace' or prerequisites. No explicit when-not-to-use or sibling comparisons are included, leaving usage context vague.

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