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

The description discloses a key behavioral trait: placing can also replace an existing cube. It also states the coordinate domain and that y=0 is ground, which is useful. However, with no annotations provided, it does not cover return behavior, error cases, or other side effects.

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?

Two short sentences deliver the essential behavioral and coordinate information with no filler. The action is front-loaded and the constraints are relevant and concise.

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 tool with 5 parameters, no annotations, no output schema, and no parameter documentation, the description is too thin to fully prepare an agent. It explains coordinates and replacement but omits builder semantics, type selection guidance, and expected return or error behavior.

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. It adds meaning for x/y/z via '[0,1000)' and 'y=0 is ground', but it says nothing about the type enum or the optional builder parameter. Parameter semantics are only partially explained.

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 ('Place or replace a single cube') and differentiates it from siblings like fill_box or remove_cube by emphasizing the single-cube scope. It is immediately clear what the tool does.

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 phrase 'single cube' implies this is for individual placement rather than bulk operations, but there is no explicit guidance on when to choose this over fill_box, build, or remove_cube. The coordinate constraints provide usage context, but alternative routing is left implicit.

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