fillBox

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

With no annotations, the description carries the full burden. 'Fill' implies a mutating operation, but the description does not disclose whether existing blocks are replaced, whether the operation is reversible, how it interacts with the current project, or any limits on size. These behavioral traits are uncovered.

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 six-word sentence with no redundant or extra information, making it highly concise and easy to scan. It front-loads the verb and object, though the extreme brevity limits its content value.

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 three required nested parameters, no output schema, and no annotations, a one-sentence description is far from complete. It omits coordinate semantics, whether bounds are inclusive, block property syntax, and the weighted block list behavior, leaving too much to inference.

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 description coverage is 0%, so the description must compensate, but it does not explain the roles of 'from', 'to', or 'block'. An agent would have to infer that from/to are corner coordinates and block is the fill material, and the weighted array variant is completely unexplained.

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 clear action ('Fill') applied to a specific resource ('solid rectangular box'), which conveys what the tool does. It does not explicitly distinguish from sibling tools like outlineBox or wall, but the shape and 'solid' qualifier imply differentiation.

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?

There is no guidance on when to use fillBox versus sibling tools such as setBlocks, outlineBox, wall, or line. No conditions, prerequisites, or alternatives are mentioned, leaving the agent to guess the appropriate context.

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