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anatolykoptev

n8n MCP Agent

get-webhook-url

Retrieve the webhook URL for an n8n workflow to trigger it from external services. Extracts the webhook path from workflow nodes.

Instructions

Get the webhook URL for a workflow. Extracts webhook path from workflow nodes. IMPORTANT: Arguments must be provided as compact, single-line JSON without whitespace or newlines.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
idYesWorkflow ID
clientIdYesClient ID from init-n8n
Behavior3/5

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

No annotations provided, so description carries burden. 'Get' implies read-only operation, but no explicit statement about side effects, permissions, or nondestructive nature. Some transparency but not thorough.

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 sentences, no wasted words. Front-loaded with purpose, followed by important usage note. Highly concise.

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?

With no output schema, description misses describing return value. However, purpose is clear enough that agent can infer output likely is a URL string. Lacks completeness for a fully self-contained description.

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 covers 100% of parameters with basic descriptions. Description adds critical formatting instruction about compact JSON arguments, which is not in schema and essential for correct invocation.

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?

Specifically states 'Get the webhook URL for a workflow' and adds context about extracting from workflow nodes, making it clear what resource and operation. Distinct from sibling tools like get-workflow.

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?

Only provides a formatting requirement for arguments, not when to use this tool over alternatives or prerequisites. No guidance on use cases or exclusions.

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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