vast42_update_ad

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

With no annotations provided, the description is the sole source of behavioral disclosure, but it only states the basic action ('Update'). It does not explain whether the update is partial or full, what side effects occur, whether special permissions are needed, or what errors might arise. This is a significant gap 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?

The description is extremely concise (7 words) and front-loaded with the core action. However, it omits information that could be included without bloat, such as the list of updatable fields, making it efficient but slightly under-specified.

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 no annotations, no output schema, and only four parameters, the description is incomplete. It does not clarify whether only provided fields are updated, what the return value is, or any operational context like whether the ad item must exist. This leaves the agent without crucial information for correct invocation.

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 descriptions cover 100% of parameters, so the schema already documents id, name, active, and location. The tool description adds no extra semantic meaning beyond what is in the schema, which aligns with the baseline score of 3 given high schema coverage.

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 'Update a VAST 4.2 ad item' uses a specific verb ('Update') and names the resource ('VAST 4.2 ad item'), clearly distinguishing it from siblings like vast42_create_ad, vast42_delete_ad, and vast42_update_creative. The version qualifier '4.2' also differentiates it from generic update tools like vast_update_ad_item.

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 provides no guidance on when to use this tool versus alternatives such as vast42_create_ad or vast_update_ad_item. There is no mention of prerequisites, exclusions, or a preferred context for this update operation.

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