Set the volume of an active media cast to a specific level between 0 and 100, letting you control playback loudness on Chromecast or DLNA devices.
Regle le volume du cast (0-100)
| Name | Required | Description | Default |
|---|---|---|---|
| level | Yes | Niveau de volume (0-100) |
Changes observed during successful MCP inspections.
v0.2.1Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=false, idempotentHint=true, destructiveHint=false, and openWorldHint=true, covering the safety profile. The description adds no behavioral traits beyond the volume range, which is also present in the input schema. No contradiction exists.
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 one concise sentence that front-loads the action ('Regle le volume du cast') followed by the accepted range. Every word earns its place; there is no fluff or repetition.
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 one-parameter mutation tool, the description is adequate. The schema and annotations cover the parameter and safety profile, and there is no output schema requiring explanation. Sibling context clarifies that 'cast' refers to the cast device, so 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%; the 'level' parameter is fully documented with type, min/max, and a French description. The tool description simply restates the same range without adding semantic nuance. Baseline 3 applies.
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 states a specific verb ('Regle' = adjusts), a clear resource ('le volume du cast'), and a value range (0-100). It is distinct from all sibling tools, none of which mention volume control, so an agent can immediately tell what this tool does.
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?
No explicit when-to-use or alternatives are mentioned. However, the tool's purpose is self-evident: use it to set the cast device's volume. This is implied usage, but there is no guidance on when not to use it or how it relates to siblings.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.