Create Playlist

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

Annotations already declare write, open-world, non-idempotent and non-destructive, so the description rightly doesn't restate those. It adds genuinely new context: a concrete quota cost (57 units) and the fallback behavior for the language field when omitted — both are facts an agent cannot get from the structured data.

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?

Three short lines, front-loaded with the core action, then default behavior, then quota. The phrasing "Left out, the language is copied from your most recent public upload, as video uploads do" is slightly awkward and takes a second read, but nothing is padded.

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?

An output schema exists, so return values need no explanation, and all parameters are covered by the schema. Combined with annotations covering the safety profile and the description adding quota cost and the language fallback, an agent has what it needs to call this correctly.

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 all five parameters are already documented, which sets the baseline at 3. The description does add one useful nuance — that omitting language inherits the language of the most recent public upload — but it says nothing about privacy defaults, the my_channel selector, or description handling.

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?

States a specific verb and resource ("Create a playlist") plus the target scope ("on the authorized user's channel"). The verb alone separates it from the sibling update_playlist / delete_playlist, though no sibling is named explicitly.

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 when-to-use guidance, no prerequisites, no named alternatives. An agent must infer from the name that this is the creation path versus update_playlist, and there is no mention of what is required before calling (e.g. channel authorization state).

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