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

Annotations already establish read-only, idempotent, non-destructive behavior. The description adds useful context by stating the source is ACS 5-year and listing the returned fields, but it does not disclose potential limitations such as data suppression, margins of error, or geography-specific availability.

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 description is two sentences, front-loaded with the core purpose, and includes a compact list of return fields plus the data source. Every sentence adds information without redundancy.

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, but the description enumerates the returned counts and median age, which is adequate for a read-only demographic lookup. The schema handles parameter semantics, and the source attribution provides important temporal context, though a note on ACS estimate reliability would improve completeness.

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 input schema fully documents all 8 parameters with descriptions and an enum for level, so the description does not need to repeat parameter details. The description adds only general geography context, which is insufficient to raise the score above the baseline.

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 clearly identifies the tool's specific purpose: providing race, ethnicity, and age breakdowns for US geographies. It lists the exact returned metrics and names the data source, making it easily distinguishable from sibling census tools that focus on population, income, or business data.

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 description gives clear context for when the tool is relevant: when demographic breakdowns by race, ethnicity, or age are needed. It does not explicitly name alternatives or exclusions, but the detailed output list makes the appropriate use case evident.

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