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

The annotations already declare destructiveHint=true, openWorldHint=true, non-idempotent writes, so the safety profile is covered. The description contributes a real behavioral fact beyond them — that furniture arrangement is preserved — but says nothing about the fact that the operation regenerates/overwrites imagery, nor about latency or cost for a generative call.

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?

Three short sentences, zero filler, with the precondition front-loaded before the exclusion. Every clause earns its place by changing agent behavior.

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?

An output schema exists, so return values need no explanation, and the description covers selection, prerequisites, and missing-input handling for a five-parameter tool. The remaining gap is that the destructive/regenerative nature of the call is left entirely to the annotations.

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 100%, so the baseline is 3 and the schema already explains room_type, design_style, image, and additional_instructions. The description adds only a collection policy (which fields to ask for) rather than new meaning about individual values, so it does not exceed the baseline.

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 scope: restyle a furnished room while preserving the furniture arrangement. It also separates itself from the empty-room siblings in the same sentence, so an agent can pick between change_room_style and empty_room/virtual_stage_room without consulting a schema.

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?

It gives an explicit gate ("Use only when...") plus a negative rule ("Do not use this to furnish an empty room"), which is exactly the when/when-not pattern. It even prescribes how to gather missing inputs, telling the agent to ask only for image, room type, and design style.

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