checkUsersSavedAlbums

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

No annotations are provided, so the description carries the full burden. The verb 'Check' implies a read-only operation, which is a useful behavioral trait. However, it does not disclose return format, error behavior, or any caveats (e.g., handling of invalid album IDs). This is basic transparency but not rich.

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, well-structured sentence that front-loads the action and includes the key scope ('user's 'Your Music' library'). No filler 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?

The tool is simple with one fully-documented parameter and no output schema. However, the description does not specify what the check returns (e.g., a single boolean or array of booleans), which would be helpful for an agent. Given no annotations and no output schema, the description is minimally adequate but leaves room for ambiguity.

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?

The schema already fully describes the only parameter (albumIds) with type, maxItems, and description. The tool description adds no additional parameter semantics. Baseline 3 is appropriate given 100% schema coverage.

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 tool's purpose with a specific verb ('Check') and resource ('albums saved in the user's 'Your Music' library'). It distinguishes itself from siblings like getAlbums (which retrieves album metadata) and saveOrRemoveAlbumForUser (which modifies saved state).

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: use this when you need to know whether specific albums are saved in the user's library. It does not explicitly mention when not to use it or provide alternatives among siblings. This is implied rather than explicit guidance.

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