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

It discloses genuinely non-obvious behavior beyond the annotations: the call mutates nothing itself, returns a preview plus a confirmation link, and only the merchant can complete the change. That is important because readOnlyHint=false could otherwise suggest the call writes directly; the description reconciles this by describing a two-phase confirmation flow rather than a direct mutation.

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 behaviorally important content (no direct change, preview + confirmation link) is front-loaded after the one-line purpose. The intervening "Money is integer minor units (cents)" sentence is boilerplate that earns no place in a tool with no monetary parameters.

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?

With no output schema, the description correctly spends words on the return contract: a preview of what would change plus a confirmation link. Combined with the fully-covered input schema, an agent has enough to call this correctly, though it lacks any mention of prerequisites or tenant/permission requirements.

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 schema already carries the meaning of trackInventory, backorderPolicy and lowStockThreshold, including the enum semantics. The description adds no per-parameter guidance, and its "Money is integer minor units (cents)" sentence is irrelevant here since no parameter is monetary.

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 verb+resource pair ("Set how the shop counts stock") is concrete and matches the three inventory-tracking settings. It does not, however, differentiate itself from neighbors like inventory_adjust (which changes counts) or settings_store_defaults, so an agent must infer the boundary from the name 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?

The description usefully explains the call workflow (returns a preview, merchant confirms on a page), which implies when the call is appropriate. It never states when NOT to use it or names an alternative such as inventory_adjust for actually changing counts, so routing remains partly inferred.

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