Set the default style

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

Annotations already indicate the operation is idempotent and non-destructive. The description adds meaningful behavioral context by stating the effect is persistent ('going forward') and the benefit (avoids re-specification), which goes beyond the structured hints without contradicting them.

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, well-structured sentence that front-loads the action and purpose. Every word contributes to understanding the tool's function, with no extraneous information.

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 2-parameter setter with full schema coverage and no output schema, the description fully explains what the tool does and its effect. The context is complete enough for an agent to select and invoke it correctly without further elaboration.

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%, with both parameters described in the schema (styleId and its deprecated alias id). The description adds no additional parameter-level details, so it relies on the schema's own descriptions, making the baseline of 3 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 states the action ('Set'), the resource ('default style'), and the scope ('for this user going forward'). It distinguishes itself from sibling tools like list_styles or delete_style by focusing on setting the default, not managing styles themselves.

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 implies when to use it ('so it doesn't need to be re-specified every time'), giving clear context on its purpose. It does not explicitly name alternatives or exclusions, but the context is sufficient for selecting this tool over related style-management tools.

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