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

The description discloses that the entire text content is replaced, which is a useful behavioral detail beyond the annotations. However, this fact largely repeats the schema's text parameter description ('Replaces existing'), and no additional side effects, permissions, or reversibility information is provided.

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 very short and front-loaded with the key operation and behavior. The first sentence is somewhat redundant with the tool name and title, but the overall entry remains concise and scannable with no filler.

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 simple two-parameter tool with an output schema and clear annotations, the description is nearly sufficient: it names the target resource and the full-replace behavior. The main missing piece is sibling differentiation and usage guidance, which is relevant given the large family of update_* widget tools.

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%, with both required parameters already documented. The description's mention of replacing the entire text content only restates the schema's existing parameter descriptions, so it does not add meaningful semantic value beyond 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 names the exact operation ('Update') and resource ('TEXT widget'), and adds a concrete behavioral detail ('Replaces the entire text content'). This clearly identifies what the tool does, though it does not explicitly contrast it with sibling tools such as update_title_widget or update_button_widget.

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?

There is no guidance about when to use this tool versus alternatives. The description never mentions sibling tools or conditions for use, so the agent must infer applicability solely from the resource name. This is effectively no usage guidance.

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