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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the safety profile is covered. The description adds one useful behavioral caveat — 'Not every county has its own office' — which sets expectations for empty results. It says nothing about auth needs, result shape, or distance ranking behavior, so the added context is modest.

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?

Front-loads the entity definition, then the coverage caveat, then the when-to-use condition — a sensible order that reads cleanly. Each sentence carries distinct information, though the parenthetical about state/regional officers is slightly more detail than the agent needs to select the tool.

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, 3-parameter lookup with full schema coverage and no output schema, the description covers purpose, usage trigger, and the empty-result caveat. Nothing critical for correct invocation is missing, though more explicit routing against sibling finders would round it out.

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 three parameters (zip, state, county) are already documented in the schema, including the optional/distance-ranked semantics of zip. The description adds no parameter-level guidance beyond that, so the baseline 3 is appropriate.

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 ('Find a County Veterans Service Officer') and goes further by defining what a CVSO actually is (free claims helpers, usually county employees, state/regional in some states). This makes the entity legible without opening the schema. It doesn't explicitly contrast itself with the sibling find_accredited_representative, which is the obvious near-neighbor, so it stops short of 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?

Gives an explicit triggering condition: 'Use this when a veteran needs help filing a VA claim but does not want to pay a private attorney.' That is a clear when-to-use signal. It does not name an alternative tool for the adjacent case (e.g., find_accredited_representative), so it lacks the when-not/alternative routing that would earn a 5.

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