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nkarasiak

QGIS MCP

by nkarasiak

Get Algorithm Help

get_algorithm_help
Read-only

Retrieve detailed help for any QGIS processing algorithm, including parameter definitions, outputs, and descriptions.

Instructions

Get detailed help for a processing algorithm: parameters (name, type, optional, default), outputs, and description.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
algorithm_idYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior4/5

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

The description is consistent with the readOnlyHint annotation (non-destructive help retrieval). It specifies the content of the help (parameters, outputs, description), adding context beyond the annotation. However, it does not disclose potential behaviors like invalid algorithm_id handling 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.

Conciseness5/5

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

The description is a single sentence that efficiently conveys the tool's purpose and expected output. No unnecessary words, and the key information is front-loaded.

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?

For a simple tool with one required parameter and an output schema, the description is fairly complete. It covers what the tool does and what information it provides. Minor gap: it doesn't mention that the algorithm_id can be obtained from 'list_processing_algorithms'.

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

Parameters2/5

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

With 0% schema description coverage, the description should compensate but only reiterates that the tool returns parameter details. It does not explain the format or source of the algorithm_id parameter, leaving the agent with minimal guidance beyond the schema's name and type.

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 retrieves detailed help for a processing algorithm, listing specific subfields (parameters, outputs, description). This distinguishes it from sibling tools like 'list_processing_algorithms' or 'get_processing_providers'.

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 for when a user needs details about a specific algorithm, but it does not explicitly state when to use this tool versus alternatives (e.g., listing algorithms or executing them). No guidance on prerequisites (e.g., obtaining the algorithm_id).

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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