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

Annotations already declare readOnlyHint=true, openWorldHint=true and destructiveHint=false, so safety is covered. The description adds that the branch parameter pulls branch-specific stock and prices plus the underlying endpoint path, but says nothing about behavior when the id is unknown or the branch is invalid.

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?

Two tight sentences: the functional statement comes first, the endpoint reference last. Nothing is redundant or padded.

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 two-parameter read-only lookup with no output schema, the definition tells the agent what is retrieved and what the optional parameter adds. Only the shape of the returned product and error behavior are left unstated, which is acceptable given the annotations.

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%, so both parameters are already documented; the description only adds that branch is optional and that it yields stock and prices rather than stock alone, a marginal gain over the schema's 'branch-specific stock data'.

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+resource and scope: a single product fetched by id, optionally enriched with stock and prices for one branch. The 'by id / one product' phrasing implicitly separates it from the list_products and search_products siblings, though it never names them.

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 'by id' scope implies when to use it over list_products or search_products, but there is no explicit guidance, no prerequisites, and no statement about when the branch argument should be supplied.

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