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

Annotations (readOnlyHint=true, openWorldHint=false) already establish this as a side-effect-free, closed-domain calculation, so the bar is lower. The description adds real value by disclosing the exact formula, though it says nothing about precision, rounding, or units beyond gallons.

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 short sentences, front-loaded with the result unit followed by the formula. Nothing is wasted, though the formula's variable names (L, W) are not explicitly tied to the parameter names.

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?

With no output schema, the description still tells the agent the return value is a volume in gallons, and all three inputs are documented in the schema with defaults. It is essentially complete for a pure calculator; only rounding/precision expectations are unstated.

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% and each parameter carries its own default and unit, so the baseline is 3. The formula adds meaning by showing the length and width are halved into radii and that depth is the average depth, but it does not clarify edge cases such as non-uniform depth.

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 resource and result unit ('Gallons in an oval (elliptical) pool'), which plainly separates it from calc_round_pool_volume and the generic calc_pool_volume by pool shape. It does not name those siblings explicitly, so it stops at 4 rather than 5.

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 'oval (elliptical)' qualifier implicitly tells the agent when this tool applies versus the round or generic pool variants, but there is no explicit when-to-use statement or named alternative. Usage is inferred from the shape word alone.

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