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duynghien

n8n-custom-mcp

by duynghien

execute_workflow

Trigger any n8n workflow by specifying its ID, starting automation runs on demand. Use this action to execute workflows manually when needed.

Instructions

Manually trigger a workflow

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
idYesWorkflow ID

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv2.2.1

TDQS

C2.9/5.0
Behavior2/5

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

No annotations are provided, so the description must disclose the operation's behavior. It only says 'trigger a workflow' without explaining side effects, whether it starts an asynchronous execution, whether the workflow must be active, or what the response contains.

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 extremely short and front-loaded, containing no filler. It loses a point because its brevity sacrifices useful contextual details that could be conveyed in one or two additional phrases.

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 side-effecting trigger operation with no annotations and no output schema, the description is too thin. An agent cannot know what happens after calling it, whether it returns an execution ID, or what conditions must be met.

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 100% and the single 'id' parameter is documented as 'Workflow ID'. The description adds no new parameter meaning, so the baseline of 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description uses a specific verb ('trigger') and names the resource ('workflow'), clearly indicating an execution action. The word 'manually' helps separate it from automated triggers like trigger_webhook, though it does not explicitly contrast with activate_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?

No guidance is given about when to choose this tool over siblings such as activate_workflow, trigger_webhook, or get_execution. 'Manually trigger' implies a use case, but there are no explicit conditions, prerequisites, or exclusions.

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