save_tracks

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

No annotations are provided, so the description carries the full behavioral burden. It discloses the mutation action but omits auth requirements, duplicate handling, idempotency, and any rate-limit or error behavior, leaving significant gaps.

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 short sentences with the purpose front-loaded. The second sentence ('Needs track_ids.') is somewhat redundant with the required schema field but is brief enough not to waste much space.

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 simple 1-parameter mutation with no output schema, the description gives enough to invoke the tool but lacks any usage guidance or behavioral context. It is minimally adequate but would benefit from distinguishing alternatives and noting duplicate behavior.

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 100% and the schema already documents track_ids as 'Track URIs or IDs.' The description adds only a redundant reminder that the parameter is required, so the baseline of 3 is appropriate.

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 ('Add') and resource ('Liked Songs'), which distinguishes it from siblings like add_to_playlist and like_current. However, it does not explicitly name or contrast those alternatives, so it falls 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 description says only 'Needs track_ids', which restates the required parameter rather than offering when-to-use guidance. It does not explain when to use this tool versus add_to_playlist, like_current, or add_to_queue.

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