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nkarasiak

QGIS MCP

by nkarasiak

Delete Field

delete_field
Destructive

Delete a field from a vector layer in QGIS using natural language commands. Simplify attribute table management.

Instructions

Delete a field from a vector layer.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
layer_idYes
field_nameYes
Behavior3/5

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

The annotation already provides destructiveHint: true, and the description confirms the destructive nature with 'Delete'. However, it adds no additional behavioral context such as irreversibility or permissions.

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 concise sentence with no wasted words, effectively communicating the core action.

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

Completeness2/5

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

Given the 0% schema coverage and no output schema, the description lacks crucial context such as error handling, reversibility, or editing requirements. It is insufficient for a complete understanding.

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

Parameters1/5

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

Schema description coverage is 0%, yet the description does not explain the parameters beyond their names. It fails to provide any additional meaning for layer_id or field_name.

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 deletes a field from a vector layer, using a specific verb and resource. It distinguishes from siblings like remove_layer (deletes a layer) and delete_features (deletes features).

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

Usage Guidelines2/5

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

The description offers no guidance on when to use this tool versus alternatives (e.g., rename_field). There is no mention of prerequisites or 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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