add_spacer

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

No annotations are provided, so the description bears full responsibility. It states the tool adds space to prevent duplication but does not disclose any side effects, such as whether it modifies existing components or affects the layout in other ways. There is no mention of reversibility or any behavioral traits beyond the basic action.

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 in Japanese, which is concise and to the point. It effectively conveys the purpose without unnecessary detail. However, it may be too brief for non-Japanese speakers, but assuming the target audience understands Japanese, it is well-structured.

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 the tool's simplicity with two optional parameters and no output schema, the description is adequate. However, it lacks details about the unit of length and what 'character duplication' means exactly. The description does not explain how the spacer integrates with existing components, but for a basic tool, this may be sufficient.

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 input schema has 100% coverage, with both 'length' and 'direction' parameters described. The description adds no additional meaning beyond what the schema provides, so the baseline score of 3 is appropriate.

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 indicates the tool adds space between components to prevent character duplication. The verb 'add' and resource 'space between components' are specific, and the purpose is stated. However, it does not explicitly differentiate from sibling tools, but the sibling list does not include similar spacing tools, so it is sufficiently clear.

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?

No guidance on when to use this tool versus alternatives. The description implies it is for spacing, but there is no mention of when not to use it or any alternative approaches. The sibling tools include 'add_component' and 'optimize_layout', but no comparison is made.

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