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anatolykoptev

n8n MCP Agent

delete-variable

Delete a variable in n8n by providing its ID. Requires an enterprise license.

Instructions

Delete a variable by ID. NOTE: Requires n8n Enterprise license. IMPORTANT: Arguments must be provided as compact, single-line JSON without whitespace or newlines.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
idYesVariable ID
clientIdYesClient ID from init-n8n
Behavior2/5

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

No annotations exist, so the description alone must convey behavioral traits. It states 'Delete' implying mutation, but does not disclose whether deletion is permanent, cascading effects, or authorization beyond license. The scope of the destructive action is unclear.

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

Conciseness4/5

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

The description is concise with two sentences. The purpose is front-loaded, and the important notes about license and formatting are included. Minimal waste, but could be slightly more structured.

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

Completeness3/5

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

For a simple delete operation with no output schema, the description covers purpose and key requirements. However, it lacks details on idempotency, error behavior, or confirmation. Not fully complete given the complexity.

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 100% with both parameters described. The description adds no additional meaning beyond the schema (e.g., 'by ID' matches the id parameter). Baseline score of 3 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 'Delete a variable by ID', specifying the verb 'delete' and the resource 'variable'. It distinguishes from sibling tools like create-variable and list-variables.

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 mentions license and formatting requirements, which are important for usage, but does not explicitly state when to use this tool versus alternatives (e.g., when to delete vs. update). No when-not guidance is provided.

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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