← All harnesses

Harness

LangGraph

Low-level orchestration framework for reliable agents.

LangChain's open-source framework for stateful agents. Developer-oriented; pairs with LangSmith for hosting and tracing.

Where it runsLocal or cloud
CostFree tier

Open-source library is free; hosted deployment is paid.

Good for: Support triage, Content

Visit LangGraph · Source: www.langchain.com

What plugs into LangGraph

Local AI tools

Local AI tool

Ollama

Run open models locally with one command.

Local or cloudFree

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