Play a saved YouTube Music playlist by name from your library. If none matches, it reports that and lists the closest saved names.
Play one of the user's saved YouTube Music playlists by name (needs the library; says so when no saved playlist is called that and lists the closest names).
| Name | Required | Description | Default |
|---|---|---|---|
| name | Yes |
Changes observed during successful MCP inspections.
v0.1.0Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the behavioral burden. It discloses the library prerequisite and the not-found behavior of listing closest names, but it does not describe whether playback starts immediately, authentication requirements, or other side effects.
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 a single front-loaded sentence with no wasted framing. The parenthetical is dense but contains useful prerequisite and error behavior.
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 one-parameter playback tool with no annotations and no output schema, it covers the main invocation context and failure mode. It remains incomplete about playback side effects and library-state requirements.
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 coverage is 0%, so the description must add meaning. It clarifies that 'name' refers to a saved playlist name and that exact saved-playlist matching is involved, including closest-name suggestions, but it does not specify formatting or case sensitivity.
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 and resource: 'Play one of the user's saved YouTube Music playlists by name.' It is clearly different from general search or playback siblings, though it does not explicitly name the alternative tools.
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?
Usage is implied: use this when the user wants to play a saved playlist by name. The description adds a prerequisite ('needs the library') and failure behavior, but it does not explicitly say when to use a sibling tool instead.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.