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

Annotations already indicate write operations (readOnlyHint false) and safety (destructiveHint false, idempotentHint true). The description adds the 'write or clear' behavior but does not explain how clearing works (e.g., passing an empty string), which is a meaningful behavioral detail beyond the 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 a single sentence that is front-loaded with the action and resource. Every word earns its place, with no filler or repetition of schema details.

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 one-parameter tool with annotations, the description is mostly sufficient, but it omits how to trigger the 'clear' action and any prerequisites or side effects. This leaves a gap for an agent unfamiliar with the storefront concept.

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?

With 0% schema description coverage, the tool description compensates by linking the parameter 'line' to the storefront description and the 'one-line' constraint, aligning with the maxLength 160. It does not explicitly state that empty string clears, but it provides enough context for the parameter's purpose.

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 phrase 'Write or clear' and identifies the exact resource: 'the one-line description on your storefront.' This clearly differentiates it from siblings like browse, buy, or read_listing, making the tool's purpose unmistakable.

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 explicit when-to-use or alternatives are given, but the description implies the tool should be used when a store owner needs to set or remove their storefront description. Sibling tools are obviously distinct, so context is clear, yet exclusions and alternative scenarios are not addressed.

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