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

With annotations only partially covering the safety profile, the description adds real behavioral context: the call is non-mutating, returns a preview plus a confirmation link, and only the merchant can complete the change. 'Calling this changes nothing' sits in tension with readOnlyHint=false, but the description explains the two-phase design that reconciles them (this call stages, the page commits).

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?

Four short sentences, front-loaded with the purpose before the behavioral caveat. The money/units sentence earns no place here and slightly muddies an otherwise tight description.

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 three-optional-parameter tool with no output schema, the description supplies the crucial missing context: no state change occurs, a preview and confirmation link come back, and the merchant performs the actual change. It could go further by resolving the read-only tension or pointing to the confirm/publish sibling, but the essentials are present.

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%, so the three parameters are already fully documented with lengths and empty-value semantics. The description adds nothing about them, and its 'Money is integer minor units (cents)' sentence is irrelevant since no monetary parameter exists, so baseline 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 names a specific verb and resource set: setting the shop's name, tagline and contact email. That scope is narrow enough to distinguish it from broad siblings like settings_identity or settings_store_defaults, but no sibling is named explicitly and the tool name 'settings_details' misleadingly suggests a read tool, so the description must do the work alone.

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?

It explains the mechanics of use (calling returns a preview, the merchant confirms elsewhere), which is important guidance about what a call actually accomplishes. It never states when to prefer this over overlapping siblings such as branding_set or settings_identity, so the when-to-use decision is only implied.

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