list_playlist_snapshots

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

With no annotations, the description must carry behavioral disclosure, and it does indicate read-only listing and optional filtering. However, it does not mention return shape, ordering, whether snapshots are local vs library-level, or any side-effect guarantees beyond the implication of 'list'.

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?

One compact sentence communicates the core operation and the sole modifier; there is no filler or redundancy. The structure appropriately front-loads the action and resource.

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 one optional parameter, the description is mostly sufficient, but because the toolset contains similarly named list/snapshot utilities and no output schema exists, an agent could still be unsure what a snapshot entry contains or which snapshot store is being listed. A brief note on return contents or distinction from list_saved_snapshots would make it complete.

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 describes playlist_id at 100% coverage ('If provided, only snapshots for this playlist'), so the description's 'optionally filtered by playlist_id' adds no new semantics. Baseline 3 applies because the schema handles the parameter documentation.

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 ('List') and a specific resource ('stored snapshots'), and adds the optional playlist_id filter. It is clear on its own, but it does not differentiate from the near-duplicate sibling list_saved_snapshots or list_backups.

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 only usage guidance is the optional filter for playlist_id; there is no statement of when to choose this tool over sibling listing tools like list_saved_snapshots or list_backups, and no exclusions. For a tool in a dense snapshot family, this leaves selection to inference.

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