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

With no annotations to indicate safety, the description carries the burden and does well by disclosing the precise effects: 'Removes the DB row and (if no other rows reference the same R2 object) deletes the R2 object too.' It also notes ownership by the authenticated tenant. It stops short of stating irreversibility or error behavior, but the core destructive behavior is 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 compact and front-loaded: core action and side effects first, then the required parameter, then an example. Every line earns its place with no redundant wording.

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 one-parameter delete tool with no output schema, the description provides the essential invocation details: operation, ownership scope, side effects, parameter format, and example. It does not describe return values or error cases, but that is a minor gap given the low complexity.

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 coverage is 0%, so the description must fully document the parameter. It does: 'REQUIRED: creative_id (str — UUID)' plus a concrete example. This adds meaningful type/format detail beyond the generic 'string' in the schema.

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 states a specific verb and resource: 'Delete a single creative owned by the authenticated tenant by creative_id.' It clearly identifies the target and differentiates from sibling tools like creatives_delete_folder because it is explicitly deleting a creative, not a folder.

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 gives clear context for when to use the tool: deleting a single creative by its ID. It does not explicitly mention alternatives or exclusions, but the scope is unambiguous enough to guide selection among destructive creative-related siblings.

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