create_playlist

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

With no annotations provided, the description carries the full burden. It discloses that 'Requires an initial item (item_key parameter) to be created successfully' - a crucial behavioral constraint not evident from the schema alone. However, it doesn't mention authentication requirements, rate limits, or what happens on failure, leaving gaps 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?

Two sentences, zero waste. The first sentence states the core purpose, the second provides critical constraints. Every word earns its place with no redundancy or fluff.

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 mutation tool with no annotations and no output schema, the description does the minimum: states purpose and key constraint. However, it doesn't explain what happens on success (e.g., returns playlist ID), authentication needs, or error conditions, leaving important context gaps for the agent.

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%, so the schema already documents all three parameters thoroughly. The description adds minimal value beyond the schema - it mentions the 'item_key' requirement but doesn't provide additional context about parameter interactions or usage patterns that aren't already in the schema descriptions.

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 verb ('Create') and resource ('new regular playlist on the Plex server'), distinguishing it from sibling tools like 'add_to_playlist' or 'delete_playlist'. It specifies it's for 'regular' playlists only, not smart playlists, providing clear differentiation.

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 explicitly states when NOT to use this tool ('Smart playlists are not supported'), which helps guide usage. However, it doesn't mention alternatives for smart playlists or clarify when to use this versus other playlist-related tools like 'add_to_playlist' or 'list_playlists'.

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