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duynghien

n8n-custom-mcp

by duynghien

trigger_webhook

Send custom HTTP requests to a webhook path with method, headers, body, query parameters, and test mode to validate n8n workflow execution.

Instructions

Trigger a webhook endpoint for testing

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
bodyNoJSON body payload
methodNoPOST
headersNoCustom headers
test_modeNoUse /webhook-test/ endpoint if true
query_paramsNoQuery parameters
webhook_pathYesWebhook path/UUID

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv2.2.1

TDQS

B3.2/5.0
Behavior2/5

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

There are no annotations, so the description must disclose behavioral traits. It only says the tool 'triggers' an endpoint 'for testing', without explaining side effects, whether the request actually fires, response behavior, or failure handling. The external side effect of triggering a webhook is a significant undisclosed trait.

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 front-loaded sentence with no filler. Every word adds meaning, and it delivers the core purpose immediately.

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?

For a tool with six parameters, no annotations, and no output schema, this one-line description is not enough. It omits invocation semantics beyond the schema (e.g., how webhook_path maps to a target, whether the request is actually sent, what the response contains) and leaves the agent guessing about expected outcomes.

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 description coverage is 83%, so the schema already documents webhook_path, body, method, headers, test_mode, and query_params. The description adds no parameter-level meaning beyond what the schema provides, so it meets the baseline but does not exceed it.

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 names a specific action ('Trigger') and a specific resource ('webhook endpoint'), and adds the purpose 'for testing'. None of the sibling tools target webhooks, so there is no ambiguity with workflow or credential operations.

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 gives no guidance about when to use this tool rather than a sibling such as execute_workflow, and no exclusions or prerequisites are stated. An agent is left to infer the intended context from the tool name alone.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.