← All harnesses

Harness

n8n

Visual workflow automation with native AI agent nodes.

Fair-code workflow builder you can self-host or use in the cloud. Its AI Agent node wires a model to tools, memory and 400+ app integrations, and it can act as an MCP client or server.

Where it runsLocal or cloud
CostFree tier

Self-hosted Community Edition is free; cloud plans are paid (see n8n.io/pricing).

Good for: Lead follow-up, Support triage, Bookkeeping, Content, Website chat

Visit n8n · Source: github.com

What plugs into n8n

Agents

Agent

Retell AI

AI voice agents that answer and make phone calls.

CloudFree tier
Agent

Vapi

Developer platform for voice AI agents.

CloudFree tier

Local AI tools

Local AI tool

Ollama

Run open models locally with one command.

Local or cloudFree
Local AI tool

LM Studio

Desktop app to download and run local models.

Runs locallyFree

MCP connectors

MCP connector

Zapier MCP

Connect any MCP-capable agent to 9,000 apps.

CloudFree tier
MCP connector

Stripe MCP

Let agents look up payments, invoices and customers in Stripe.

CloudFree
MCP connector

HubSpot MCP Server

Give agents access to your HubSpot CRM records.

CloudFree
MCP connector

QuickBooks Online MCP Server

Intuit's MCP server for QuickBooks bookkeeping data.

Runs locallyFree
MCP connector

MCP Reference Servers

Official reference MCP servers: filesystem, fetch, memory, git and more.

Runs locallyFree

Harnesss

HarnessBuilt by the founder

s3a-harness

Open-source MCP research-agent harness with human approval gates.

Runs locallyFree