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

Annotations already declare readOnly, idempotent, non-destructive, openWorld, so the safety profile is covered. The description adds useful behavioral context (one-calendar-year range restriction, county scoping, the aggregated fields returned) but says nothing about pagination via max_rows or rate limits.

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 resource and scope, followed by the source attribution. No filler, though the clause stacking makes it slightly heavy.

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 an output schema present, return-value detail is unnecessary, and full annotations cover the safety profile. The description supplies the key operational constraints (county scope, one-year window) an agent needs to call it correctly.

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%, so the schema already documents FIPS codes, date formats, parameter codes, and max_rows. The description only echoes that it targets a county and pollutant parameters (PM2.5, ozone) without adding format or syntax detail. Baseline 3 is appropriate.

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+resource: daily summary air quality measurements from EPA monitors in a US county, and even names the returned aggregates (mean, max, AQI, site). 'Daily' distinguishes it from the sibling get_annual_data implicitly, though it never names the 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?

The description supplies scoping constraints ('US county', 'date range within one calendar year'), which tell the agent how the tool operates, but gives no explicit when-to-use vs when-not guidance or routing to siblings like get_annual_data or get_monitors. Usage is only implied.

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