add_tracks_to_playlist

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

The description adds significant behavioral context beyond annotations: the ⚠️ CAUTION warning about database modification provides crucial safety information, and 'Detailed results of the batch operation' describes output behavior. Annotations indicate mutability (readOnlyHint=false) and idempotency, but the description enhances this with practical implications.

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 perfectly structured: purpose statement first, critical warning next, then parameter explanations, and finally return behavior. Every sentence earns its place with no redundancy, making it highly scannable and efficient.

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 this is a mutation tool with 2 parameters, 0% schema coverage, but with output schema present, the description provides excellent completeness. It covers purpose, safety warning, parameter meanings, and output behavior—everything needed beyond the structured fields for effective tool use.

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?

With 0% schema description coverage, the description compensates well by explaining both parameters: 'playlist_id: ID of the playlist to modify' and 'track_ids: List of track IDs to add'. This adds essential semantic meaning missing from the bare schema. However, it doesn't specify format requirements or constraints.

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 ('Add multiple tracks'), target resource ('existing playlist'), and scope ('in one operation'). It distinguishes from sibling 'add_track_to_playlist' by emphasizing batch/multiple capability, making the purpose unambiguous.

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 provides clear context for when to use this tool (batch adding to existing playlists) and implicitly distinguishes from 'create_playlist' (requires existing playlist) and 'add_track_to_playlist' (single vs multiple). However, it doesn't explicitly state when NOT to use it or mention all relevant alternatives like 'remove_track_from_playlist'.

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