add_tracks

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

With no annotations provided, the description carries the behavioral disclosure burden. It openly states the mutation ('Add') and a key behavioral detail—duplicates are skipped automatically. It does not mention authorization or failure modes, but the duplicate semantics are a valuable disclosure.

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 carries the noun, verb, target resource, accepted formats, and a deduplication guarantee. There is no wasted text and every clause adds information.

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 two-parameter mutation tool without an output schema, this description is near-complete: it captures the operation, the accepted input, and the important duplicate-handling behavior. It omits permission requirements and error cases, but those are common to such tools and the operation is simple enough that the model can proceed confidently.

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?

Schema description coverage is 0%, so the description must compensate. It clarifies that track_ids accept either IDs or spotify:track URIs and implies playlist_id refers to the target playlist. However, it does not explicitly map each parameter to its schema property or explain expected ID formats in detail.

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, identifies the resource (playlist) and explicitly welcomes both track IDs and spotify:track URIs. It distinguishes itself from remove_tracks and save_tracks, but it does not directly reference a sibling, so it stops slightly short of a 5.

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 context is clear: use this when you want to add tracks to an existing playlist, with duplicate-skipping behavior. It does not explicitly name alternatives or state when not to use it, but the operation is specific enough for an agent to infer appropriate usage.

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