List available email mailbox plans with quotas and prices (monthly and annual, in cents). Requires authentication. Always quote prices from here — never from memory.
| Name | Required | Description | Default |
|---|---|---|---|
| sessionKey | No | Session key (osk_...) returned by checkDeviceLoginStatus. Pass it on every call when logged in via the in-chat device flow; omit when connected via OAuth. |
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the behavioral burden. It discloses the authentication requirement, the pricing unit (cents), and the fact that this tool is the authoritative source for mailbox plan pricing. It does not explicitly state read-only behavior or response shape, but 'List' and the data-focused wording make the behavior reasonably transparent.
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?
Two sentences with no filler: the first sentence states the resource and its relevant attributes, and the second is a high-value guardrail about pricing accuracy. Every word earns its place.
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, zero-required-parameter catalog-list tool with no output schema, the description is complete: it names the resource, the included data (quotas, prices), the pricing cadence and unit, the authentication requirement, and the correct usage rule for quoting prices. Nothing essential is missing.
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 the sessionKey parameter. The description's 'Requires authentication' aligns with the schema but adds no new parameter-level meaning, so the baseline score of 3 is appropriate.
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 uses a specific verb ('List') and a clear resource ('available email mailbox plans') with the key attributes 'quotas and prices (monthly and annual, in cents)'. This clearly differentiates it from siblings like listMailboxes, which lists actual mailboxes, and getMailboxQuote, which provides a quote.
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 gives clear context: use this tool to retrieve mailbox plan pricing and quotas, and it explicitly instructs the agent to always quote prices from here rather than memory. It does not explicitly name alternatives or state when not to use it, so it stops short of a 5.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Add one secure layer between your agents and this server.
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105 tools is an extreme count for any single MCP server, even one spanning domain registration, DNS, VPS, email, billing, app deployment, and site publishing. The surface would be far more coherent split into focused servers by domain.
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