add-to-playlist

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

The description discloses the quota cost per video ('Costs 50 quota units per video') and the cardinality ('one or more'), adding some behavioral context. However, with no annotations, it does not cover other important aspects like required permissions, error behavior, or idempotency.

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 concise, consisting of two short sentences that front-load the action and then state the cost. Every word adds value, with no redundancy or unnecessary information.

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 two-parameter write operation, the description covers the core action and the quota detail. Given the lack of annotations and output schema, it could have mentioned potential side effects or error scenarios, but it is still reasonably complete for the tool's simplicity.

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?

The input schema already provides descriptions for both parameters (playlistId and videoIds) with 100% coverage. The tool description adds no additional parameter semantics beyond what the schema already states, so the baseline of 3 applies.

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 one or more videos to a playlist') with a specific verb and resource, and it distinguishes this tool from siblings like 'remove-from-playlist' and 'create-playlist'.

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 does not provide guidance on when to use this tool versus alternatives such as 'remove-from-playlist' or 'update-playlist-item'. It only mentions the quota cost, which is a cost consideration, not a usage guideline.

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