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

The description discloses non-obvious behavior: interface nodes not already on the grid are auto-created with defaults, and blocks cannot overlap. Combined with the annotations (readOnly=false, idempotent=true, destructive=false), this gives a good picture of side effects, though it does not mention failure modes for invalid IDs or overlapping placements.

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 succinct and well-organized. It uses short paragraphs, code-style XML examples, and a concise list of grid constraints, making it easy to scan and understand without unnecessary verbosity.

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 description covers the core mechanics, constraints, and ID requirements, which is sufficient for most usage scenarios. It lacks an explanation of workflow_id and does not describe the output or return value, but the provided details are relevant and actionable.

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?

The updates_xml parameter is well explained through the XML command examples, including the required id format. However, workflow_id is not described at all, and since the schema provides no description coverage, half of the parameters lack semantic guidance.

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 tool's purpose: positioning and arranging interface blocks on a 12-column grid. It distinguishes this from sibling tools by focusing specifically on grid layout for interface-* nodes, rather than general workflow editing or evaluation.

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 provides concrete usage instructions through XML command examples and grid constraints. It implicitly indicates when to use this tool (for arranging interface blocks) without explicitly contrasting alternatives, but the command examples and domain scope make the intended usage clear.

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