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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=true, so the safety profile is covered. The description adds the endpoint path and the expandable parts, but says nothing about payload size or performance when expanding heavy parts like historyItems.

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 fragments front-load the core behavior and then the optional expansions, with zero filler. Every clause carries new information.

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 simple single-resource read with a fully documented two-parameter schema and read-only annotations, the definition covers what the agent needs. There is no output schema, but the tool's scope is narrow enough that return-shape detail is a minor omission.

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 baseline is 3. The description restates the expand values verbatim from the schema rather than adding new meaning, and the id parameter is explained only inside the schema.

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 and resource ('One stock item by id'), lists the optional expansions, and gives the underlying endpoint GET /v6/mrp/stock/{id}. An agent can distinguish this from vintrace_lookup_stock_item and vintrace_list_inventory without opening a schema.

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: the id source hint lives in the schema ('from vintrace_lookup_stock_item or vintrace_list_inventory'), not the description. It never states when to pick this over vintrace_lookup_stock_item or when a list call would be better.

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