Add Multiple Videos to Playlist

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

Annotations indicate this is not read-only and not idempotent, which the description doesn't contradict. The description adds value by specifying the OAuth requirement, which isn't covered by annotations. However, it lacks details on rate limits, error handling, or what happens on partial failures (e.g., if some video IDs are invalid).

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 a single, efficient sentence that front-loads the core purpose and includes the key constraint (OAuth). There's no wasted verbiage, and every word contributes to understanding the tool's function and requirements.

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?

Given the mutation nature (annotations show not read-only), lack of output schema, and 2 required parameters, the description is minimally adequate. It covers authentication but misses behavioral aspects like response format or error scenarios. With annotations providing some safety context, it's passable but could be more complete for a write operation.

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%, with clear parameter descriptions in the schema. The description doesn't add any semantic details beyond what's in the schema (e.g., format of IDs, constraints on array size). Baseline 3 is appropriate since the schema fully documents parameters.

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 action ('Add multiple videos') and resource ('to a YouTube playlist'), which is specific and actionable. However, it doesn't explicitly differentiate from its sibling 'playlists_addVideo', which appears to be a single-video version, though the 'multiple' distinction is implied.

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 mentions OAuth authentication as a requirement, which provides some context, but it doesn't offer guidance on when to use this tool versus alternatives like 'playlists_addVideo' or 'playlists_create'. No explicit when-not-to-use or prerequisite information is included.

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