s3_delete_object

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It only states 'Delete an object,' which implies destruction but does not mention idempotency, permanence, error behavior (e.g., what happens if the key does not exist), or required permissions. This is a mutation tool with minimal transparency, similar to the 'update_drive' example that scored 2.

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 sentence that directly conveys the action and context. It is appropriately sized, with no wasted words, and fully serves its purpose without unnecessary elaboration.

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 tool is simple (2 required params, no output schema), and the description covers the action and context. However, it is minimal and does not mention expected behavior on missing objects or the LocalStack environment's specifics. For a delete operation, this is arguably sufficient, but it's a minimum viable description with room to add idempotency or error details.

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 100%, with both 'bucket' and 'key' already described in the input schema. The description adds no additional parameter detail, so the baseline of 3 applies—the schema adequately documents the parameters, and the description does not need to compensate.

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: 'Delete an object from an S3 bucket in LocalStack.' It uses a specific verb (delete) and resource (object in S3 bucket), and the LocalStack context distinguishes it from AWS or other cloud environments. This unambiguously differentiates it from sibling tools like s3_put_object or s3_list_objects.

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?

Usage is implied by the verb 'Delete' and the resource, but there is no explicit guidance on when to use this tool over alternatives (e.g., s3_delete_bucket) or any preconditions like bucket existence. The description does not state exclusions or recommend alternatives, but the purpose is clear enough that a user would know this is for removing objects.

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