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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds the data content and provenance ('with the official source'), but says nothing about response format or pagination, which keeps it at a moderate level.

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 dense sentence that front-loads the returned data types and ends with provenance. No filler, no redundancy with the title.

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?

There is no output schema, so the description must convey return values; it does so at a high level (counts, eligibility, nomination/certification status, source). For a one-parameter read-only tool with rich annotations, this is nearly complete, though exact field shapes remain unspecified.

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?

With a single parameter at 100% schema coverage ('Two-letter code, FIPS code or name'), the schema already does the heavy lifting. The description adds only that a territory is also accepted ('one state or territory'), a marginal gain over 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 specifies the resource and data returned (counts of 2018 zones, rural zones, 2027-eligible tracts, nomination/certification status) and scopes it to one state or territory. It is clear what the tool does but never contrasts itself with siblings like get_tract or lookup_address, so it stops short of a 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 phrase 'for one state or territory' implies the appropriate scope (state-level aggregation), but there is no explicit when-to-use guidance, no exclusions, and no mention of alternatives such as get_tract for tract-level data. Usage is only inferable.

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