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

No annotations are provided, so the description carries the full burden. It discloses key behavioral traits: it searches YouTube Music, selects the top result, and opens it in the default browser. However, it does not mention potential side effects (e.g., browser pop-ups, audio playback), authentication needs, or rate limits, leaving gaps for a tool that interacts with external services.

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, efficient sentence that front-loads the core functionality ('Search for a track on YouTube Music and open the top result in the default browser'). There is no wasted text, and every word contributes to understanding the tool's purpose and 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?

Given the tool's moderate complexity (interacts with external service, opens browser) and no annotations or output schema, the description is somewhat complete but lacks details on error handling, what happens if no results are found, or the format of any potential return values. It covers the basic operation but leaves gaps for robust agent usage.

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%, so the schema already documents the single parameter 'trackName'. The description adds meaning by explaining that this parameter is used to 'search for a track' and 'play' it, providing context beyond the schema's basic description. Since there is only one parameter, the baseline is high.

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 clearly states the specific action ('Search for a track on YouTube Music and open the top result in the default browser'), including the verb ('search' and 'open'), resource ('track'), and scope ('top result', 'default browser'). It distinguishes from the sibling tool 'YouTube Music MCP_searchTrack' by specifying the additional action of opening the result.

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?

The description implies usage context ('search for a track') but does not explicitly state when to use this tool versus alternatives like the sibling 'searchTrack' tool. It provides clear context for when to use it (to play a track), but lacks explicit exclusions or comparisons with other tools.

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