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

Annotations already declare readOnlyHint=false, destructiveHint=true, openWorldHint=true, so the safety profile is covered. The description adds nothing beyond that: it omits the required confirm_id preview/confirm workflow, which is essential behavioral context for a destructive write, and says nothing about reversibility or account scoping.

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?

A single short sentence with no wasted words and the core action front-loaded. It is concise, though arguably under-specified for a destructive tool rather than efficiently minimal.

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 destructive mutation tool with no output schema and an implicit two-phase confirm flow, the description is materially incomplete. It omits the confirm_id protocol, account scoping behavior, and any indication of what the operation returns or affects.

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 only 50%: sku and quantity carry no schema descriptions, and the description does nothing to explain expected quantity format, ranges, or how confirm_id/account_id interact. With half the parameters undocumented, the description fails to compensate for the coverage gap.

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?

States a specific verb (Update), resource (MFN inventory quantity) and scope (for a SKU), which is clear and distinguishable from the sibling bulk_update_inventory. However, it never acknowledges the alternative single-vs-bulk or preview/confirm path, so it stops short of full sibling differentiation.

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 on when to use this instead of bulk_update_inventory or bulk_update_prices, and no prerequisites are stated. Most critically, the schema's confirm_id param implies a two-step preview/confirm flow that the description never mentions, so an agent could invoke this blind.

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