Air current reading

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

Annotations already declare readOnlyHint=true, idempotentHint=true, openWorldHint=true, and destructiveHint=false, so the safe-read profile is fully covered. The description adds useful context about the default public sensor and location constant, but does not disclose additional behavioral traits such as rate limits, staleness of data, or failure behavior. No contradiction with annotations.

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 tight sentences with zero filler. The primary purpose is front-loaded, and the default-location behavior is packed into the second sentence efficiently. Every word earns its place.

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?

For a simple read-only tool with 0 required params, rich annotations, and fully documented schema, the description is nearly complete. It covers the operation, default behavior, and the key parameter path (locationId). It does not need to explain return values since output schema is absent, though a brief note on response shape could push it to 5.

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%, with each parameter (provider, locationId, privacy_mode) having meaningful descriptions including enums and the default provider. The description's prose redundantly mentions locationId but adds no meaning beyond the schema, so the baseline 3 applies.

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 states a specific verb ('Fetches'), resource ('most recent air-quality reading'), and scope ('for a location'). It is distinguishable from siblings like air_daily_summary and air_trend by the 'most recent reading' framing, though it does not explicitly name or contrast those alternatives.

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 context is implied by the purpose ('most recent reading' = current conditions snapshot), and the default behavior (AirGradient public sensor, default location) gives a sense of when it applies. However, there is no explicit when-to-use or when-not-to-use guidance, nor any reference to sibling tools like air_aqi_check for alternative needs.

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