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

readOnlyHint=true already declares the safety profile, so the description's added value is the disclosure of which fields come back and the underlying Admin API route (GET /v1/admin/articles/{id}), which helps an agent correlate this with the REST surface. It stops short of noting error behavior for a missing/invalid id, which matters for a lookup tool with no output schema.

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?

One sentence for purpose and return fields, then the endpoint as a compact trailing detail. Front-loaded and free of padding.

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?

No output schema exists, and the field enumeration compensates by telling the agent what a successful response contains. The only gap is the absence of anything about failure modes or whether the item is workspace-scoped, which is minor for a one-parameter read.

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% and the single parameter's description already says it comes from twicecommerce_list_stock_items. The description's 'by id' adds nothing beyond the field name, so baseline 3 applies.

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?

Specific verb and resource ('Get one stock item by id') plus an enumeration of the fields returned (SKU, condition, quantity, location, status). The singular 'one' implicitly separates it from twicecommerce_list_stock_items, but no sibling is named explicitly.

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?

Usage is only implied: fetch a single stock item when you have an id. There is no statement of when to prefer this over list_stock_items, get_sku, or check_availability, all of which are adjacent in the toolset.

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