changes_since

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

No annotations are provided, so the description carries the behavioral burden. It clearly communicates what the tool reports (playlist changes, per-playlist track changes, and like changes) and the default snapshot behavior. It does not mention permissions, rate limits, or a side-effect profile, but the wording strongly suggests a read-only comparison utility and the core behavior is well disclosed.

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 one compact sentence that front-loads the core behavior and then enumerates the specific result categories with no filler. Every word contributes.

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 small tool with one optional parameter, the description covers default invocation and makes the return content reasonably clear through the labeled change categories. However, without an output schema or annotations, and without describing how snapshot values relate to sibling snapshot tools, the agent still has to infer important context about how to pick a snapshot and what 'latest' means.

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 has only a bare 'snapshot' string property, yet the description explains that the parameter selects a snapshot and that the default is the latest snapshot. This adds real meaning beyond the schema, though it could go further by explaining how to obtain a snapshot ID (for example, via list_snapshots or snapshot_library).

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 identifies the tool's resource ('changes since a snapshot') and enumerates the exact categories it reports: playlists created/deleted/renamed, tracks added/removed per playlist, likes added/removed. It is close to a 5 but phrased as a fragment/question rather than a clear imperative, and it does not explicitly distinguish itself from sibling snapshot/diff tools.

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 phrase 'since a snapshot' and the 'latest' default imply the intended use case, but there is no explicit guidance about when to use this tool instead of siblings like playlist_diff, snapshot_library, or list_snapshots. The description leaves the agent to infer the difference between comparing against a snapshot and other comparison utilities.

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