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QGIS MCP Server

QGIS MCP Server

by awheeler262
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Local

Find Layer

find_layer
Read-only

Find QGIS layers by name pattern using wildcards or substring search. Locate specific layers quickly without navigating the layer panel.

Instructions

Find layers by name pattern. Supports fnmatch wildcards (e.g. 'roads*') and substring matching.

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": {
      "name_pattern": "<name_pattern>"
    },
    "name": "find_layer"
  }
}

Input Schema

NameRequiredDescriptionDefault
name_patternYes

Output Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

A4.2/5.0
Behavior4/5

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

Annotations already indicate readOnlyHint=true. The description adds behavioral details about fnmatch wildcard and substring matching support, which is valuable context beyond what annotations provide.

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?

Two concise sentences with no wasted words. Front-loaded with the core action and immediately followed by key matching details.

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?

With an existing output schema, the description does not need to explain return values. It covers matching semantics well, but could mention that it returns layer objects for completeness.

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

Parameters4/5

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

Schema description coverage is 0%, so the description must compensate. It adds meaning to the name_pattern parameter by specifying wildcard and substring matching, though a more explicit format example would be even better.

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 finds layers by name pattern, specifying support for fnmatch wildcards and substring matching. This distinguishes it from sibling tools like get_layers or get_active_layer.

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 does not explicitly guide when to use this tool versus alternatives like get_layers. It implies usage for pattern-based search but lacks explicit when-to-use or when-not-to-use guidance.

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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