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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds real value beyond that: it names the governing math (38 CFR 4.25, bilateral factor 4.26) and promises a step-by-step breakdown, which tells the agent the response is explanatory rather than a bare number. It does not describe the exact output format, but that is a minor omission for a deterministic calculator.

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?

A single front-loaded sentence with zero filler: it identifies the action, the authoritative method, and the output style. Nothing could be removed without losing 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 read-only, deterministic calculation tool with a fully documented input schema, the description supplies the essential missing context: the algorithmic basis and the fact that intermediate steps are returned. The only gap is that no output schema exists and the response shape is only loosely characterized.

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 all nested fields (rating step-of-10 constraint, side, extremity for the bilateral factor) are documented inline in the schema. The description adds no parameter-level meaning beyond that, so the baseline of 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?

States a specific verb and resource ('Combine individual VA disability ratings') and pins the exact methodology with citations to 38 CFR 4.25 and the bilateral factor in 4.26. The domain is clearly distinct from 'ask_va_benefits_question' and 'bdd_separation_checklist', so an agent can route without ambiguity.

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 implied by the purpose: an agent can infer it should call this when it has a set of individual ratings and needs the combined value. However, there is no explicit when-to-use statement, no guidance on when this is preferable to asking a benefits question, and no stated prerequisites or edge-case handling.

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