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by io.github.whiteknightonhorse
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Air Quality by Coordinates

environment.airquality.nearest
Read-onlyIdempotent

Real-time air quality index (AQI) and weather data for the nearest monitoring station to given GPS coordinates. Returns nearest city, AQI (US + CN), dominant pollutant, PM2.5/PM10/O3 concentrations, temperature, humidity (IQAir AirVisual)

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "lat": "<lat>",
      "lon": "<lon>"
    },
    "name": "environment.airquality.nearest"
  }
}

Input Schema

NameRequiredDescriptionDefault
latYesLatitude (-90 to 90, e.g. 34.0522)
lonYesLongitude (-180 to 180, e.g. -118.2437)

Output Schema

NameRequiredDescriptionDefault
errorNoPresent only when the call failed. Includes error code, message, request_id, and any provider-specific extras.
resultNoTool response payload. Shape varies per tool — consult the tool description and inputSchema. May be an object, array, string, or number depending on the upstream provider response.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

A4/5.0
Behavior4/5

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

Annotations already declare readOnlyHint=true, destructiveHint=false, idempotentHint=true, openWorldHint=true. The description adds context about real-time data, specific fields returned, and data source (IQAir AirVisual), which goes beyond annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is two concise sentences: first states core functionality, second lists returned data. No filler words, front-loaded with the purpose.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the simple two-parameter input and existence of an output schema, the description covers what the tool does, what it returns, and the data source. It lacks mention of geographic coverage or potential limitations but is largely complete.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The input schema has 100% coverage with descriptions for 'lat' and 'lon'. The description does not add additional parameter semantics beyond restating 'GPS coordinates'. Baseline score is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool returns real-time AQI and weather data for the nearest monitoring station to given GPS coordinates, listing specific return fields. It distinguishes from sibling 'environment.airquality.city' by specifying coordinate-based lookup.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies usage when coordinates are available, but does not explicitly state when to use this tool over alternatives like 'environment.airquality.city' or other weather tools. No mention of when not to use it.

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

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