add_tracks_to_playlist

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

Without annotations, the description carries full burden but fails to disclose behavioral details such as whether tracks are appended or overwritten, permission requirements, or error handling. Only the basic action is stated.

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 very concise and structured as a docstring, but it is too brief to add significant value beyond the schema. Every sentence is functional but not optimally informative.

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 simplicity, the description barely covers the basics. It does not mention what the output represents (though an output schema exists), error conditions, or that the playlist must already exist.

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 description adds a constraint 'up to 100' for track_uris, which is not in the schema. However, with 0% schema description coverage, more detail is needed (e.g., format of URIs, valid playlist ID format).

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 action 'Add tracks to a playlist', distinguishing it from siblings like create_playlist and remove_tracks_from_playlist. However, it lacks specificity about the context (e.g., adding to an existing playlist).

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 guidance is provided on when to use this tool versus alternatives like modify_playlist_details or create_playlist. The description does not mention prerequisites or typical use cases.

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