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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so safety is known; the description still adds the important scale limit ('Returns up to 100 stock items') and the fields returned (unit, quantity, minimum, low-stock flag). It doesn't mention what happens when more than 100 items exist or whether results are ordered, minor gaps given the low-risk read profile.

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 trigger first, then the return shape, then a one-clause exclusion. No filler, no restatement of the title, and every clause carries information the agent can act on.

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 read-only list tool with an output schema, full input schema coverage and rich annotations, the description covers purpose, trigger and result shape adequately. The only shortfall is that it doesn't point to set_inventory_quantity for the adjacent write operation or to list_clinics for the clinicId, which the schema mentions but the description doesn't.

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 all four parameters (limit, search, clinicId, lowStockOnly) are already documented in the schema, which sets the baseline at 3. The phrase 'what is running low' loosely echoes lowStockOnly but adds no syntax, defaults or format guidance beyond 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?

The description names a specific resource ('medicine, product or supply ... in their vet clinic's stock') and the concrete question it answers ('how much ... is left' / 'what is running low'). It also explicitly excludes a neighbouring concern ('Not for procedure prices'), which separates it from list_procedures without the agent needing to compare schemas.

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?

It gives an explicit trigger ('Use this when someone asks how much ... is left') plus a stated exclusion, so the when-to-use side is well covered. What's missing is positive routing to the related write tool set_inventory_quantity when the user wants to change stock rather than read it, and the clinicId hint lives only in the schema.

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