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

Annotations already declare readOnlyHint=true, so the safety profile is covered. The description adds real behavioral context beyond that: it returns the issuing agency source, the current edition, the date older editions are rejected, and a fill-and-sign page. It does not mention coverage gaps or ambiguity handling, keeping it short of a 5.

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?

The content is front-loaded: capability and coverage come first, the when-to-use cue comes last. The example list is long but functional, showing the accepted code/name space. Slightly heavy for a one-parameter lookup, hence not a 5.

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 carries the burden of describing returns, and it does so (source, current edition, rejection date, fill/sign page). Combined with the covered parameter and readOnly annotation, an agent has what it needs to invoke correctly; only edge cases like ambiguous or non-existent forms are unaddressed.

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 there is a single documented parameter, so the baseline is 3. The description reinforces the parameter by giving many example values (W-9, W-4, 1099-NEC, I-130, I-765, N-400, "green card application"), which signals that names as well as codes are accepted, but it adds no syntax or format rules 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 states a specific verb and resource ("Find an official form") and immediately bounds the scope with concrete coverage (US IRS/USCIS, Canada, UK) and example form codes (W-9, I-130, N-400). An agent can distinguish this from the unrelated PDF-tool siblings without opening any schema.

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 a user asks where to get, fill in or sign a form." That is a clear usage context. It does not name alternatives or exclusions, but the sibling tools are not plausible substitutes, so little is left to inference.

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