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

Annotations only declare readOnlyHint=false, so the description must convey write behavior and side effects. It states that position, width, and height use sensible defaults, which is useful, but it does not mention permissions, reversibility, or what happens to existing widgets. It does not contradict annotations.

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 two short sentences with no redundancy. The core action is front-loaded, and the additional note about defaults is directly relevant to expected behavior. Every word earns its place.

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 tool has an output schema, and the input parameters are well-documented, so basic calling is clear. However, the description does not explain how a title widget differs from other widget types or when to prefer it, and the defaults statement is vague about placement. For a simple add operation it is minimally complete but not rich.

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 coverage is 100%, so all five parameters are already described with their own meanings and defaults. The description adds no extra parameter-level detail, and its mention of position/width/height refers to non-existent parameters, which is slightly ambiguous. Baseline 3 applies because the schema carries the burden.

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 uses a specific verb ('Add') and resource ('title widget') and clarifies the target ('to a page'). It distinguishes from siblings like add_text_widget or add_button_widget by naming the widget type explicitly, and the mention of defaults adds operational scope.

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 offers no guidance on when to use this tool versus alternatives like add_text_widget or add_heading_widget. It does not state when not to use it, nor does it reference sibling tools or provide selection criteria. Usage is only implied by the name.

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