playlist_addTracks

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

No annotations are provided, so the description carries full burden. It does disclose that an automatic backup is created, which is a positive safety signal, but it fails to explain the potentially destructive 'replace' mode, whether existing tracks are removed, or how backup restoration works. This is a significant behavioral ambiguity for a mutation tool.

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 extremely compact—two short sentences that immediately convey the primary action. No unnecessary words or repetition exist.

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 tool with 3 parameters, a replace mode, no annotations, and no output schema, the description is noticeably under-specified. It leaves critical behavioral details about replacement, backup, and error handling unstated. The backup mention is a small positive, but overall the description does not sufficiently equip an agent for correct invocation.

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 coverage is 0%, so the description needed to compensate but did not. It offers no explanation of playlistName, trackIds, or mode beyond what the schema already shows. The mode parameter's enum values (add/replace) are left entirely unexplained, meaning the agent cannot infer the behavioral difference from the description.

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 uses a clear verb+resource pattern ('Add tracks to a playlist') and is distinct from sibling playlist tools like playlist_removeTracks, playlist_delete, etc. However, it omits the 'replace' mode supported by the schema, so the description slightly under-represents the tool's full capability.

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 usage guidance is provided. The description does not explain when to use this tool versus playlist_removeTracks or playlist_create, nor does it mention any preconditions or scenarios where replace mode might be appropriate.

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