create_playlist

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

With no annotations, the description discloses that creation fails without an item_key and that smart playlists are unsupported. This adds valuable behavioral insight beyond the input schema, though it does not cover authentication or potential side effects.

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 concise sentences that front-load the purpose and immediately follow with critical usage constraints. No extraneous information, every sentence adds value.

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 creation tool with 3 parameters and no output schema, the description covers purpose, requirement, and limitation. It is contextually complete for an agent to select and use the tool, though return behavior is not described.

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 100%, so baseline is 3. The description adds context by linking the requirement of an initial item to the item_key parameter and suggesting where to obtain item keys (search_plex or browse_library), providing operational guidance beyond the schema.

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 tool creates a new regular playlist on the Plex server, specifying 'regular' to distinguish from smart playlists. It mentions the requirement for an initial item, making the purpose precise.

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?

Provides clear context: requires an initial item for successful creation, and explicitly excludes smart playlists due to filter complexity. Lacks explicit mention of when to use alternatives like add_to_playlist, but the limitation is clearly stated.

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