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

Annotations already declare readOnly, idempotent, non-destructive, and closed-world, so the safety profile is fully covered. The description adds that results include two-letter codes and provider categories, but says nothing about ordering, size, or whether the set is static — modest added value for a no-parameter reference call.

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 tight sentence with no padding, and the core subject (the states/territories covered) leads. It lacks a verb, making it read as a fragment rather than a complete statement of what the call does.

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 does the job of indicating return contents: states, their two-letter codes, and available provider categories. For a static zero-parameter reference tool this is nearly sufficient, though the result shape (e.g., grouping of categories per state) is left unstated.

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?

The tool takes zero parameters, so the schema carries nothing to explain; baseline is 4. The description correctly implies no inputs are needed to get the full coverage list.

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?

Names a specific resource (states and territories HomelessHelper covers) and the return contents (two-letter codes, provider categories). It is distinguishable from homeless_counties and homeless_providers_search by scope, though the verb is only implied via the title rather than stated.

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 only implied: an agent can infer this is a coverage/lookup endpoint to call before filtering by state. There is no explicit statement of when to prefer it over homeless_counties or homeless_providers_search, and no prerequisites or exclusions.

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