Create a new Plex playlist from a content URI or existing play queue to group media for playback.
Create a Playlist.
POST /playlists
Args:
uri: The content URI for what we're playing (e.g. library://...).
play_queue_id: To create a playlist from an existing play queue.
| Name | Required | Description | Default |
|---|---|---|---|
| uri | No | ||
| play_queue_id | No |
| Name | Required | Description | Default |
|---|---|---|---|
| result | Yes |
Changes observed during successful MCP inspections.
v1.0.0Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already convey that this is non-read-only, non-destructive, and idempotent. The description adds no behavioral context beyond the purpose itself, such as side effects, required permissions, or failure modes. There is no contradiction with the annotations.
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 short, front-loaded, and free of filler. The endpoint line and parameter bullets are useful. It could be slightly more integrated, but every element earns its place.
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?
The tool is low-complexity with two optional parameters, an output schema, and annotations covering safety. Still, the relationship between uri and play_queue_id is left ambiguous, and there is no guidance for the no-argument case. This is minimally viable but has clear gaps.
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 must carry parameter meaning. It does explain uri as a content URI with an example and play_queue_id as a source for creating from an existing play queue. However, it does not clarify whether the parameters are alternatives, combinable, or what happens if neither is provided.
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 states a clear verb and resource: 'Create a Playlist.' It also includes the endpoint POST /playlists, which reinforces the action. However, it does not distinguish this tool from the sibling create_playlists_upload, so the agent must infer the difference from names alone.
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?
There is no guidance on when to use this tool versus create_playlists_upload, update_playlists, or other playlist-related siblings. The parameter hints imply two creation sources, but no decision rule, exclusions, or alternatives are stated.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.