Create a YouTube ad

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

The description discloses side effects (emails followers once per video) and access requirements (paid membership), and explains the distinction between active and disabled status. It does not cover reversibility or deletion, but the main behavioral aspects are transparent.

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 and to the point, containing only essential information without redundancy or unnecessary elaboration. It is well-structured with clear sentences covering purpose, status behavior, 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?

The description provides sufficient context for the tool's operation, including membership requirements and error conditions, but does not specify the success response or return structure. Given the absence of an output schema, this minor omission is acceptable but not fully complete.

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?

All four parameters (title, status, description, youtube_link) are described in the schema, with additional detail in the description for status (active/disabled) and youtube_link (accepted formats). The description fully clarifies the meaning and allowed values for each parameter.

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 that the tool creates a YouTube video ad, explains the automatic video ID derivation from the link, and specifies the effects of the status parameter. It is unambiguous about the tool's primary action.

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 a prerequisite (paid membership) and failure condition (error for free accounts), but does not explicitly indicate when to use this tool versus other link or ad creation tools. It lacks guidance on typical use cases or scenarios.

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