Unraid MCP

Next Unraid upsUpdates event

unraid_v4371_next_ups_updates

Read-onlyIdempotent

Fetch the next UPS power event from an Unraid server, returning a single update before disconnecting. Use to monitor battery status changes.

Instructions

Wait for the next event from this fixed GraphQL subscription, return one bounded payload, then disconnect.

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "unraid_v4371_next_ups_updates"
  }
}

Input Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

First observedv1.0.1Aug 30, 2026

TDQS

A4.4/5.0

Behavior5/5

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

Annotations already indicate readOnly, idempotent, and non-destructive behavior, but the description adds critical subscription semantics: it blocks until the next event, returns exactly one bounded payload, and then disconnects. This is highly valuable behavioral context that annotations do not convey and prevents an agent from treating this as a simple query.

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?

A single sentence that front-loads the core action, then states the result and lifecycle. Every clause earns its place; there is no fluff or repetition of schema or annotations.

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

Completeness4/5

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

For a zero-parameter subscription tool with safety annotations already present, the description is nearly complete. It does not describe the payload structure beyond 'bounded payload', which would be a gap in the absence of an output schema, but the name and 'upsUpdates event' provide enough contextual signal for an agent to know what kind of data is coming.

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

Parameters4/5

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

The tool has zero parameters and schema description coverage is 100%, so there is nothing for the description to explain about inputs. The phrase 'fixed GraphQL subscription' usefully reinforces that no parameters are needed because the subscription is predetermined.

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?

Description uses a specific verb ('wait for'), identifies a fixed GraphQL subscription, and states the exact behavior: return one bounded payload then disconnect. This clearly distinguishes it from the many query_* sibling tools, which fetch current state rather than waiting for an event.

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

Usage Guidelines3/5

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

The wording implies one-shot subscription use: wait for the next event, get one payload, then stop. However, it does not explicitly mention when not to use it or point to alternative tools such as unraid_get_ups or unraid_v4371_query_ups_devices for current state reads, leaving the routing partially implicit.

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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