Update playlist

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

Beyond annotations (readOnly=false, idempotent=true), the description discloses that the playlist must be owned by the logged-in user and that track_urns causes a full replacement of the existing track list. This is exactly the kind of side-effect context an agent needs before calling a mutating tool.

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?

Two sentences with no filler: the first states the core operation and scope, the second front-loads the replacement warning and routes incremental edits to the correct siblings. Every sentence earns its place.

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 a 17-parameter mutation with no output schema, the description covers the main risk (track-list replacement), the ownership constraint, and the appropriate alternatives. It does not explicitly state whether omitted metadata fields are preserved or what the response contains, so it stops just short of 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?

With only 35% schema description coverage, the description adds some framing by calling the fields 'metadata' and emphasizing track_urns' replacement behavior. However, track_urns is already described in the schema as a 'Full ordered replacement track list', and most of the 17 parameters still lack semantic detail; ambiguous fields like 'release' are left to name-guessing.

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 names a specific verb ('Update'), a specific resource ('metadata of a playlist owned by the logged-in user'), and the optional replacement of the track list. This clearly separates it from sibling playlist-editing tools like soundcloud_add_playlist_tracks and soundcloud_remove_playlist_tracks.

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?

It states when to use this tool (metadata updates or full track-list replacement) and explicitly points to soundcloud_add_playlist_tracks / soundcloud_remove_playlist_tracks for incremental edits. This gives the agent a direct decision rule rather than leaving it to infer from sibling names.

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