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

Annotations already declare readOnly/idempotent/non-destructive/closed-world, so safety is covered. The description adds genuinely new behavioral context: it returns one row per state in a single call and defines what the metrics (including 'coverage gap (vets per resource)') mean, which is valuable given there is no output schema.

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?

Two tightly packed sentences with the core value ('single-call ranked summary of ALL US states') front-loaded and the metric list folded into a colon clause. Every clause earns its place; nothing is redundant.

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 return-value burden and does well: one row per state, all metrics named and one defined. It stops short of stating sort direction, default behavior, or whether territories are included, which are minor gaps for a single-param summary tool.

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 0%, so the description must carry the parameter meaning. It does expand the enum values (e.g., 'gap' -> 'coverage gap (vets per resource)', 'resources' -> 'resources in directory'), which the bare enum does not. However it omits sort direction/ordering semantics, leaving a real gap.

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 ('ranked summary of ALL US states') and enumerates the exact metrics returned, so an agent can immediately tell this is a cross-state comparison tool. It implicitly distinguishes itself from per-state siblings like get_state_dashboard by emphasizing 'ALL US states' and 'single-call', but never names an alternative explicitly.

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 implied rather than stated: 'Single-call' hints this is the efficient way to compare states versus issuing many per-state calls, and 'Sort by ...' implies it is for ranked exploration. There is no explicit when-to-use/when-not guidance and no sibling named as an alternative.

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