add_to_playlist

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

With no annotations, the description must disclose behavioral traits. It indicates a mutation (add) but omits critical details: idempotency, duplicate handling, error conditions (e.g., playlist not found), access requirements, or side effects. This is insufficient for safe agent invocation.

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 a single sentence, which is concise. However, conciseness comes at the cost of completeness; a slightly longer description including a prerequisite or behavioral note would improve utility without being verbose.

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?

Given the tool's complexity (mutation, two required params, no annotations, sibling tools), the description is insufficiently complete. It fails to cover execution context (e.g., playlist existence, authentication) and does not leverage the presence of an output schema to reduce burden. Significant gaps remain.

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 adds minimal meaning by stating 'by video ID' (hinting that video_id is the identifier) but does not explain the format, constraints, or how to obtain valid values. No additional context for playlist_id.

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 a track to a playlist) and the key identifier (by video ID). It distinguishes the tool from siblings like create_playlist (creation) and get_playlists (listing). However, it does not specify prerequisites such as playlist ownership or authentication, which slightly weakens clarity.

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 guidance is provided on when to use this tool versus alternatives. The sibling tools are listed but not referenced, and there is no mention of cases where another tool (e.g., search_music to find a video_id first) might be needed beforehand.

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