Abyssfall: Operation Sunken Crown

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subscribe_newsletter

Idempotent

Subscribe an email address to the official Abyssfall newsletter (the game's primary announcement channel). Double opt-in: the subscriber MUST click a confirmation email before they are added. Only call with the user's explicit consent.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "email": "<email>"
    },
    "name": "subscribe_newsletter"
  }
}

Input Schema

Name	Required	Description	Default
`name`	No
`email`	Yes

Output Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

First observedJun 12, 2026

TDQS

A4/5.0

Behavior4/5

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

Annotations indicate idempotent and non-destructive. Description adds the crucial double opt-in detail (subscription not immediate) and consent requirement, going beyond annotations without contradiction.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Three concise sentences, front-loaded with action and key constraints, no wasted words.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Good overall coverage of process and consent, with output schema likely detailing return values. However, missing parameter clarity for 'name' and no mention of error handling (e.g., invalid email or duplicate).

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage 0%, description only explains the 'email' parameter usage. The 'name' parameter (default empty) is undocumented – its purpose (optional subscriber name?) is unclear, leaving ambiguity.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool subscribes an email to the game's primary newsletter announcement channel, distinguishing it from sibling tools (get/ preorder) and including the double opt-in requirement.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly states this tool should only be called with the user's explicit consent and describes the double opt-in process. Could be improved by mentioning idempotency implications or when not to call.

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

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