gisgp

tile_math

Convert a WGS84 lon/lat + zoom level to Slippy Map (XYZ) tile x/y, that tile's lon/lat bbox, and its Bing quadkey.

Returns JSON {ok, zoom, x, y, tile_bbox, quadkey}.

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": {
      "lon": "<lon>",
      "lat": "<lat>",
      "zoom": "<zoom>"
    },
    "name": "tile_math"
  }
}

Input Schema

Name	Required	Description	Default
`lat`	Yes
`lon`	Yes
`zoom`	Yes

Output Schema

Name	Required	Description	Default
`result`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

AddedJul 26, 2026

TDQS

A4.1/5.0

Behavior4/5

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

No annotations are provided, so the description carries full burden. It clearly outlines the input (WGS84 lon/lat + zoom) and output (JSON with ok, zoom, x, y, tile_bbox, quadkey). No side effects or destructive behavior are expected, and the description accurately reflects a pure conversion function.

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 sentences, front-loaded with the core purpose. Every word adds value; no unnecessary text. It is appropriately sized for the tool's simplicity.

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

Completeness5/5

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

Given the tool has 3 parameters, no enums, and an output schema, the description fully covers the conversion logic and output structure. It lists all output fields (ok, zoom, x, y, tile_bbox, quadkey) and notes the input format (WGS84). This is complete for a straightforward conversion utility.

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?

Schema coverage is 0%, but the description adds context: inputs are WGS84 coordinates and zoom level. However, it does not specify valid ranges (e.g., lon -180 to 180, lat -90 to 90, zoom 0-19) or units, leaving some ambiguity. The description partially compensates for the schema gaps.

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 specifies a clear verb ('Convert') and resource ('WGS84 lon/lat + zoom level to Slippy Map tile coordinates, bbox, quadkey'). It distinctly separates this tool from siblings like convert_coordinates by naming the specific conversion type.

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 the tool is for converting geographic coordinates to tile references, but does not explicitly state when to prefer this over similar tools (e.g., convert_coordinates) or provide constraints on when it should not be used. Sibling tools are numerous, so guidance would be beneficial.

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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