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anatolykoptev

n8n MCP Agent

execute-webhook

Execute an active n8n workflow via its webhook URL, sending data and headers, and receive the workflow response.

Instructions

Execute a workflow via its webhook URL. Workflow must have a Webhook trigger node and be active. Returns the workflow response. IMPORTANT: Arguments must be provided as compact, single-line JSON without whitespace or newlines.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
dataNoJSON data to send in request body (for POST/PUT)
methodNoHTTP method (default: POST)
headersNoAdditional headers to send
timeoutNoRequest timeout in milliseconds (default: 30000)
clientIdYesClient ID from init-n8n
webhookPathYesWebhook path (e.g., "my-webhook" for /webhook/my-webhook)
Behavior3/5

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

No annotations provided, so description carries full burden. It discloses that it executes a workflow (write operation), returns the workflow response, and includes a formatting constraint (single-line JSON). Missing details on error handling, idempotency, rate limits, or side effects. Adequate 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 succinct sentences plus an important note, all front-loaded. No redundant information, every sentence serves a purpose. Excellent conciseness.

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?

Given no output schema, description only says 'Returns the workflow response' without detailing format or error behavior. It mentions prerequisites but lacks guidance on handling failures or interpreting responses. Adequate for a basic tool but incomplete for complex usage.

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%, so baseline is 3. Description adds a formatting note about compact JSON for the data parameter, but does not explain other parameters beyond what schema already states. Minimal added value.

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?

Description clearly states the verb 'execute' and resource 'workflow via its webhook URL'. It distinguishes from siblings like get-webhook-url and test-workflow by specifying the prerequisite that the workflow must have a Webhook trigger and be active, making the tool's unique role obvious.

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

Usage Guidelines4/5

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

Description explicitly states that the workflow must have a Webhook trigger node and be active, providing clear when-to-use context. However, it does not contrast with alternative tools like test-workflow for testing without triggering real execution, missing a 'when not to use' guidance.

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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