like_current_song

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

With no annotations, the description carries the burden, and it does disclose a genuinely non-obvious side effect: the like boosts future recommendations, not just favorites. It omits idempotency (behavior if the song is already liked), preconditions (requires an active track), and auth needs, so the behavioral picture is partial.

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 sentence, front-loaded with the action, with a parenthetical that adds real information about effects. Nothing is wasted and nothing needs trimming.

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?

An output schema exists and the operation is parameterless, so the description needs only to convey effect and it does. The remaining gap is routing: it never resolves its overlap with add_currently_playing_to_favorites, which is the one thing an agent still needs.

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 tool takes zero parameters, so there is no parameter semantics to explain; the baseline applies. The description correctly implies the target is implicit (whatever is currently playing) rather than passed in.

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?

States a specific verb and resource ("marks the currently playing song as liked") and the parenthetical clarifies the effect. However, it does nothing to distinguish itself from the sibling add_currently_playing_to_favorites, which reads as the same operation, leaving the agent unable to tell the two apart.

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 when-to-use guidance and no mention of alternatives, despite a nearly identical sibling (add_currently_playing_to_favorites) in the same toolset. The agent must guess which of the two to invoke, and nothing says whether this applies only when a track is actively playing.

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