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

Annotations already declare readOnly/idempotent/non-destructive, so the description's added value is the disclosure of what is returned (title, revision details, official PDF link) and the important caveat that the link does not submit an application or establish eligibility — a meaningful guard against misuse in a benefits context.

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?

Five short sentences, front-loaded with the action and the example, then input sourcing, then return contents, then the caveat. Nothing is wasted, though the form_name guidance duplicates the schema text.

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?

No output schema exists, and the description compensates by stating exactly what a call returns and what the result does not do. For a single-parameter lookup this covers everything an agent needs before calling.

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 coverage is 100% and the schema's id field already states 'Official form number... Do not use the numeric catalog id', so the description largely repeats that guidance. The only marginal addition is the behavior when the value is absent, which is arguably usage guidance rather than parameter semantics.

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 ("Look up a VA form number") with a concrete example (21-0966), which distinguishes it from the search-oriented sibling find_va_forms. It doesn't name the sibling explicitly, but referencing "search results" makes the relationship inferable.

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?

Implies it is a follow-up step to a search ("Use form_name from search results") and gives an explicit fallback when the input is missing: ask the user for the form number. Clear enough to act on without opening sibling schemas, though it never explicitly says when not to use it.

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