alexa-mcp

Set Device Volume

alexa_set_volume

Adjust the volume of a specified Echo device by setting a level from 0 to 100.

Instructions

Set the volume of a specific Echo device (0-100).

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": {
      "serialNumber": "<serialNumber>",
      "volume": "<volume>"
    },
    "name": "alexa_set_volume"
  }
}

Input Schema

Name	Required	Description	Default
`volume`	Yes	Volume level (0-100)
`serialNumber`	Yes	Serial number of the Echo device

Schema Changelog

Changes observed during successful MCP inspections.

First observedv1.2.0Sep 11, 2026

TDQS

A3.5/5.0

Behavior2/5

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

No annotations provided; description only says 'Set the volume' without detailing if permissions needed or if changes are instantaneous.

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?

One concise sentence front-loading the purpose with 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?

Adequate for a simple two-parameter tool, but lacks guidance on obtaining serialNumber or any behavioral details beyond mutation.

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

Parameters3/5

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

Schema covers 100% of parameters with descriptions; the range 0-100 is already in schema, so description adds no new meaning.

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?

Clearly states 'Set the volume of a specific Echo device' with a range, distinguishing it from sibling tools like alexa_get_volumes.

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?

No explicit when-to-use or alternatives guidance, but the purpose implies usage for volume control.

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