MCP Servers

Heym

Self-hosted, source-available AI workflow automation platform. Build multi-agent, RAG, and tool-using pipelines on a visual canvas and publish any workflow as an MCP server (stdio/SSE/Streamable HTTP). Also an MCP client via the agent node.

README

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Heym

AI-Native Workflow Automation Platform

<p align="center"> <strong>Build, visualize, and run intelligent AI workflows — without writing code.</strong><br/> Drag-and-drop canvas · LLM & Agent nodes · RAG pipelines · Multi-agent orchestration · MCP support </p>

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What Is Heym?

Heym is an AI-native automation platform built from the ground up around LLMs, agents, and intelligent tooling. Wire together AI agents, vector stores, web scrapers, HTTP calls, and message queues on a visual canvas — then deploy instantly via Docker.

Unlike platforms that started as classic trigger-action automation and layered AI on later, in Heym AI is the execution model.

Explore the product site at heym.run.

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No Enterprise Gatekeeping

Many automation platforms turn essential production features into upgrade pressure: global variables, execution history and search, insights, AI Builder / Motherboard capabilities, observability, audit-style logs, team controls, scaling, or customer-facing portals.

Heym takes the opposite position. These are core workflow primitives, not enterprise bait. They ship in the free self-hostable product because serious AI automation should be inspectable, shareable, observable, and deployable from day one without any kind of weird production run limits.

Our enterprise offering is for commercial licensing, deployment help, dedicated support, and additional security layers. It is not a strategy for hiding core workflow and AI-native capabilities behind a sales call, now or later.

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Product Demos

The demos below illustrate an agent–subagent layout instead of a purely step-by-step, single-thread agent chain. For a request like “How do I get from Berlin to Frankfurt?” and “What should I eat there?”, subagents can work on those parts in parallel. That tends to finish faster, keeps each model turn focused (less context bloat), and avoids pressuring one model to produce two large, unrelated answers in a single reply.

You can still answer with two separate LLM calls (one per question) or run several calls in sequence and merge the results in a final step—those patterns work—but for this kind of multi-part ask they are usually slower than parallel subagents behind an orchestrator.

Watch Heym Tutorials

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Generate Workflows from Natural Language

Describe the agents, orchestration pattern, and user-facing result you want; Heym builds the workflow on the canvas.

Workflow Creation Demo

Example prompt

Create a workflow for me that includes a Roadmap Agent and a Best Food Agent. When the Orchestrator Agent receives a request, it will invoke these subagents in parallel and return the result to the user.

Runing Workflows

Execute the workflow directly from the canvas and inspect each step as results move through the graph.

Workflow Run Demo

Create Skills for Agents

Create agent skills from natural language, preview the generated SKILL.md, and attach them to the agent.

Skill Creation Demo

Example prompt

Create a skill for me and add it to the agent. The Orchestrator Agent will call this skill after receiving information from the subagents, and the skill will create a simple execution plan explaining what can actually be done in the destination city.

Call Workflows from Chat

Turn a workflow into a chat experience so users can invoke the orchestration with a natural request.

Chat Workflow Demo

Example prompt

I live in Berlin and am planning to go to Frankfurt. How many kilometers is it on the Autobahn? Also, where can I find the best doner in Frankfurt?

📸 Screenshots

<table> <tr> <td align="center" width="50%"> <img src="docs/screenshots/login.png" alt="Login Page" width="100%"/> <br/><sub><b>Login</b> — Workflow canvas preview in the background</sub> </td> <td align="center" width="50%"> <img src="docs/screenshots/dashboard_light.png" alt="Workflows Dashboard" width="100%"/> <br/><sub><b>Dashboard</b> — Manage workflows, credentials, vector stores, and teams</sub> </td> </tr> <tr> <td align="center" width="50%"> <img src="docs/screenshots/canvas_selected.png" alt="Workflow Canvas" width="100%"/> <br/><sub><b>Workflow Canvas</b> — Nodes connected and selected, with the properties panel open</sub> </td> <td align="center" width="50%"> <img src="docs/screenshots/node_properties.png" alt="Node Configuration" width="100%"/> <br/><sub><b>Node Config</b> — LLM node with model, prompt, and expression fields</sub> </td> </tr> </table>

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✨ Key Capabilities

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Visual Workflow Editor — Drag-and-drop canvas powered by Vue Flow with 30+ node types
AI Assistant — Describe what you want in natural language (or voice) and the assistant generates and wires nodes on the canvas automatically
Chat with Docs — Ask context-aware questions directly from the documentation header while the current article path is prioritized in the prompt
AI Skill Builder — Create new Agent skills or revise existing ones from a modal chat with live SKILL.md and Python file previews
LLM & Agent Nodes — First-class LLM node and a full Agent node with tool calling, canvas node tools, Python tools, MCP connections, skills, optional persistent memory (per-node knowledge graph with background extraction), and LLM Batch API mode with live status branches for supported providers
Multi-Agent Orchestration — One agent orchestrates named sub-agents and sub-workflows, all wired visually
Human-in-the-Loop (HITL) — Pause agent execution to request user approval or input before proceeding
Guardrails — Content filtering, NSFW protection, and multilingual safety checks on LLM and Agent nodes
Built-In RAG — Insert documents and run semantic search against managed QDrant vector stores in two nodes
MCP Support — Connect Agent nodes to any MCP server as a client; expose your workflows as an MCP server for Claude, Cursor, and other clients
Portal — Turn any workflow into a public chat UI at /chat/{slug} with streaming responses and file uploads
Webhook SSE Streaming — Generate ready-to-run cURL commands for /execute or /execute/stream, with per-node start messages and live node event output in the terminal
Data Tables — Manage structured data directly in the dashboard and reference it from workflows
Templates — Start from pre-built workflow templates to get up and running quickly
Parallel Execution — Independent nodes run concurrently based on the graph structure, no configuration needed
Auto Heal — Playwright selectors break? AI automatically detects and fixes them at runtime
LLM Fallback — Automatic model fallback when the primary LLM fails or is unavailable
Reasoning Support — Configure reasoning effort and temperature per Agent node for fine-grained control
Command Palette — Ctrl+K for instant search, navigation, and workflow actions
Evals — Define test suites and run them against any workflow with one click
LLM Traces — Full observability for every agent call: requests, responses, tool calls, and timing
Self-Hosted — Your data, your infrastructure

Full Feature Set

For a complete list of all features with short descriptions, see Full Feature Set. It covers Getting Started, every node type, reference topics (Expression DSL, workflow structure, webhooks, SSE streaming, AI Assistant, Chat with Docs, Portal, security, etc.), and all dashboard tabs (Workflows, Templates, Variables, Chat, Credentials, Vectorstores, MCP, Traces, Analytics, Evals, Teams, Logs and more).

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🎯 Why Heym?

Capability	Heym	n8n	Zapier	Make.com
Built-in LLM node	✅	✅	✅	✅
LLM Batch API + status branches	✅	partial¹⁵	❌¹⁵	partial¹⁵
AI Agent node (tool calling)	✅	✅	✅	✅
Agent persistent memory (knowledge graph)	✅	limited¹¹	limited¹¹	limited¹¹
Multi-agent orchestration	✅	✅	limited	limited
Human-in-the-Loop (HITL)	✅	✅⁵	limited⁶	limited⁷
LLM Guardrails	✅	✅⁸	✅⁸	limited⁸
Automatic context compression	✅	❌	❌	❌
Built-in RAG / vector store	✅	✅	limited¹	plugin²
WebSocket read / write	✅	limited¹²	❌¹³	❌¹⁴
Natural language workflow builder	✅	limited³	✅	✅
MCP (Model Context Protocol)	✅	✅	✅	✅
Skills system for agents	✅	❌	❌	❌
Auto Heal (Playwright)	✅	❌	❌	❌
Data Tables	✅	✅	✅	❌
Workflow Templates	✅	✅	✅	✅
LLM trace inspection	✅	limited⁴	❌	✅
Built-in evals for AI workflows	✅	✅	❌	❌
Parallel DAG execution	✅	limited⁹	❌	❌
Self-hostable, source-available	✅ CC+MIT	✅ fair-code¹⁰	❌	❌
Expression DSL for dynamic data	✅	✅	limited	✅

<details> <summary><b>Table footnotes</b></summary>

Zapier Agents support "Knowledge Sources" (upload docs, connect apps) but no user-exposed vector store or control over embeddings/chunking
Make.com has Pinecone and Qdrant modules but no native one-click RAG node — you assemble the pipeline manually
n8n's AI Workflow Builder is cloud-only beta with monthly credit caps, not available for self-hosted
n8n shows intermediate steps (tool calls, results) but full prompt/response tracing requires third-party tools like Langfuse
n8n pauses AI tool calls for review through chat, email, and collaboration channels, but it is centered on tool approval rather than snapshotting and editing the whole execution state
Zapier Human in the Loop supports approvals and data collection inside Zaps, but it doesn't resume from a captured agent/runtime snapshot the way Heym checkpoints do
Make Human in the Loop is available as an Enterprise app with review requests and adjusted/approved/canceled outcomes, but it is plan-limited and less tightly coupled to agent state
n8n ships a dedicated Guardrails node, Zapier ships AI Guardrails across its AI products, and Make documents agent rules plus review flows but not a comparable standalone guardrails feature, so Make is marked limited
n8n executes sequentially by default; parallel execution requires sub-workflow workarounds
n8n uses the Sustainable Use License — free to self-host for internal use, commercial redistribution restricted
First-class per-agent knowledge graph with prompt injection and post-run LLM merge is uncommon; other platforms typically rely on external vector DB or manual memory patterns, hence limited
n8n's official docs cover HTTP Webhook and HTTP Request nodes plus Code/custom/community extensibility, but I couldn't find a first-party WebSocket trigger/send node, so n8n is marked limited
Zapier's official docs cover inbound webhooks and outbound webhook/API requests over HTTP only, not native WebSocket trigger or send steps
Make's official docs cover Webhooks modules and HTTP(S) request modules, but I couldn't find a native WebSocket trigger or send module
As of April 22, 2026, n8n's official docs document HTTP batching and loop/wait patterns rather than a native LLM batch-status branch, Zapier's official ChatGPT app docs list no triggers and only a generic API Request beta, and Make's official OpenAI integration page exposes batch actions like create/watch completed but not a first-class status-branching LLM node, so n8n/Make are marked partial and Zapier is marked unavailable for this specific pattern

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🚀 Quick Start

git clone https://github.com/heymrun/heym.git
cd heym
cp .env.example .env
./run.sh

# OR — with .env file
git clone https://github.com/heymrun/heym.git
cd heym
cp .env.example .env
docker run --env-file .env \
  -p 4017:4017 \
  -v /var/run/docker.sock:/var/run/docker.sock \
  -v "$(pwd)/data/files:/app/data/files" \
  ghcr.io/heymrun/heym:latest

# OR — minimal, no .env file
docker run \
  -e ENCRYPTION_KEY=$(python3 -c "import secrets; print(secrets.token_hex(32))") \
  -e SECRET_KEY=$(python3 -c "import secrets; print(secrets.token_hex(32))") \
  -e DATABASE_URL=postgresql+asyncpg://postgres:postgres@host.docker.internal:6543/heym \
  -p 4017:4017 \
  -v /var/run/docker.sock:/var/run/docker.sock \
  -v "$(pwd)/data/files:/app/data/files" \
  ghcr.io/heymrun/heym:latest

Open the editor in your browser at port 4017 in either setup. For direct docker run setups, the data/files mount keeps Drive uploads and skill-generated files available across container restarts.

<details> <summary><b>🐳 Docker Production Deployment</b></summary>

cp .env.example .env
./deploy.sh              # Build and deploy all services
./deploy.sh --down       # Stop services
./deploy.sh --logs       # View logs
./deploy.sh --restart    # Restart services

Set ALLOW_REGISTER=false in .env to lock down registration in production.

</details>

🗺️ Platform Overview

<table> <thead> <tr> <th align="center" colspan="3">🧠 Heym Platform</th> </tr> </thead> <tbody> <tr> <td valign="top" width="33%"> <b>⚡ Workflow Editor</b><br/><br/> Vue Flow canvas<br/> Drag-and-drop nodes<br/> AI Assistant (chat-to-workflow)<br/> Voice input<br/> Expression DSL<br/> Edit history · Download · Share </td> <td valign="top" width="33%"> <b>🤖 AI Engine</b><br/><br/> LLM Node + Batch API mode<br/> AI Agent Node (tool calling)<br/> Persistent memory graph (agents)<br/> Multi-agent orchestration<br/> RAG / QDrant vector store<br/> MCP Client & Server<br/> Skills system </td> <td valign="top" width="34%"> <b>🌐 Integrations</b><br/><br/> HTTP · Slack · Send Email<br/> Redis · RabbitMQ<br/> Crawler (FlareSolverr)<br/> Playwright browser automation<br/> Grist spreadsheets<br/> Drive file management<br/> Cron · Webhooks </td> </tr> <tr> <td valign="top"> <b>🔍 Observability</b><br/><br/> LLM Traces (requests, tool calls)<br/> Evals (AI test suites)<br/> Execution History<br/> Analytics · Logs </td> <td valign="top"> <b>👥 Teams & Auth</b><br/><br/> JWT Auth<br/> Team management<br/> Credentials store & sharing<br/> Global variables<br/> Folder organization </td> <td valign="top"> <b>💬 Portal</b><br/><br/> Publish workflows as chat UIs<br/> Public URL: <code>/chat/{slug}</code><br/> Optional authentication<br/> File upload support<br/> Streaming responses </td> </tr> </tbody> </table>

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🧩 Node Library

30+ nodes across six categories:

Category	Nodes
Triggers	Input (Webhook), Cron, RabbitMQ Receive, Error Handler
AI	LLM, AI Agent, Qdrant RAG
Logic	Condition, Switch, Loop, Merge
Data	Set, Variable, DataTable, Execute (sub-workflow)
Integrations	HTTP, Slack, Send Email, Redis, RabbitMQ Send, Grist, Drive..
Automation	Crawler, Playwright
Utilities	Wait, Output, Console Log, Throw Error, Disable Node, Sticky Note

🧠 AI-Native Features

AI Assistant

Describe what you want in plain text or via voice — the assistant generates nodes and edges and applies them to the canvas instantly. No other automation platform ships a natural-language workflow builder that works directly inside the editor.

When a workflow already contains Agent skills, the assistant sends only each skill's SKILL.md into the builder context. Large .py files and binary attachments stay out of the prompt so workflow editing remains reliable even with complex skills loaded on the canvas.

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AI Skill Builder

Inside the Agent node's Skills section, use AI Build to create a new skill or the inline sparkle action to revise an existing one. The modal streams a chat conversation, previews generated SKILL.md and .py files live, and saves them back through the same ZIP ingestion path used by manual skill uploads.

Multi-Agent Orchestration

Build orchestrator/sub-agent pipelines visually. One agent delegates tasks to named sub-agents or sub-workflows — composing complex behavior without custom orchestration code. Configure reasoning effort and temperature per agent for fine-grained control.

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Human-in-the-Loop (HITL)

Pause agent execution at any point to request user approval, clarification, or input before proceeding. Build workflows where AI proposes and humans decide — combining automation speed with human judgment.

n8n, Zapier, and Make now offer native review or approval flows too. Heym's edge is agent-directed checkpoints with public review URLs, edit-and-continue, and full execution-state resume.

Guardrails

Apply content filtering, NSFW protection, and multilingual safety checks on LLM and Agent node outputs. Define rules in the node configuration — unsafe responses are caught before reaching downstream nodes.

n8n and Zapier now ship native AI safety tooling as well. Heym's edge is that guardrails live directly on the LLM and Agent nodes, support multilingual policy checks, and flow naturally into the workflow's existing error-handling paths.

MCP (Model Context Protocol)

As a client: Agent nodes connect to any external MCP server and gain all its tools automatically. As a server: Your Heym workflows are exposed as an MCP server at /api/mcp/sse — callable from Claude Desktop, Cursor, or any MCP client.

Skills System

Skills are portable capability bundles — a SKILL.md instruction file plus optional Python tools. Drop a .zip or .md onto an Agent node, or use AI Build to draft and iterate on skills from chat. Reuse and share across workflows and teams.

Built-In RAG Pipeline

Upload PDFs, Markdown, CSV, or JSON to a managed vector store. Then wire a RAG node into any workflow for semantic search — results flow directly into your LLM or Agent node.

Input → RAG (search) → LLM (answer with context) → Output

Auto Heal

Playwright browser automation nodes detect broken selectors at runtime and use AI to automatically find the correct replacement — no manual maintenance when the target page changes.

Parallel Execution

Independent nodes run concurrently based on the graph structure. Use the Merge node to synchronize parallel branches. No configuration needed — the graph defines the execution order.

🔍 Observability

LLM Traces

Full visibility into every agent call: request and response payloads, tool call names and results, per-call timing, and skills passed to the model.

Evals

Define test cases with expected outputs. Run the entire suite with one click. Review pass/fail, actual vs expected, and historical run data. Ship AI workflows with confidence.

💬 Portal

Turn any workflow into a public chat interface at /chat/{slug}. Optional per-user authentication, streaming responses, file uploads, and multi-turn conversation history. Ship internal tools and customer-facing chatbots — no frontend code required.

📝 Expression DSL

Reference and transform data between nodes with a clean syntax:

$input.text                         // Trigger input
$nodeName.field                     // Any upstream node output
$global.variableName                // Persistent global variable
$now.format("YYYY-MM-DD HH:mm")    // Date/time formatting
$UUID                               // Random unique ID
$range(1, 10)                       // Generate number range
$input.items.filter("item.active")  // Array filtering
$input.users.map("item.email")      // Array mapping
upper($input.text)                  // String helpers

Expressions work in every field — prompts, HTTP headers, conditions, email bodies, Redis keys, and more.

🔐 Node-Level Error Handling

Every node supports retry on failure and error branching:

Input ──→ HTTP ──→ Output
               └─── error ──→ Error Handler

Retry — automatically re-run a failed node with configurable attempts and backoff
Error branch — route failures to a dedicated path instead of stopping the workflow
Error context — access $nodeName.error in downstream nodes

🏗️ Tech Stack

Layer	Technology
Frontend	Vue.js 3 + TypeScript (strict) + Vite + Bun
UI Components	Shadcn Vue + Tailwind CSS
Canvas	Vue Flow
State Management	Pinia
Backend	Python 3.11+ + FastAPI + UV
Database	PG 16 + SQLAlchemy 2.0 (async)
Auth	JWT (access + refresh) + bcrypt

📁 Project Structure

heym/
├── frontend/src/
│   ├── components/     # Canvas, Nodes, Panels, Credentials, Evals, MCP, Teams
│   ├── views/          # DashboardView, EditorView, ChatPortalView
│   ├── stores/         # Pinia (workflow, auth, folder)
│   ├── services/       # API clients
│   └── docs/content/   # In-app documentation (Markdown)
├── backend/app/
│   ├── api/            # Routes: workflows, auth, mcp, portal, evals, traces…
│   ├── models/         # Pydantic schemas + SQLAlchemy models
│   ├── services/       # Executor, LLM, RAG, agent engine
│   └── db/             # Database configuration
├── alembic/            # Database migrations
├── docker-compose.yml
├── run.sh              # Local development launcher
├── check.sh            # Project validation script
└── deploy.sh           # Docker production deployer

⚙️ Environment Variables

Variable	Description	Default
`DATABASE_URL`	Optional database connection string override	auto-built from `POSTGRES_*`
`POSTGRES_HOST`	Database host used when `DATABASE_URL` is empty	`localhost`
`POSTGRES_PORT`	Database port used when `DATABASE_URL` is empty	`6543`
`SECRET_KEY`	JWT signing key	—
`BACKEND_PORT`	Backend server port	`10105`
`FRONTEND_PORT`	Frontend server port	`4017`
`ALLOW_REGISTER`	Enable user registration	`true`

🛠️ Development

Prerequisites: Bun ≥ 1.0 · Python ≥ 3.11 · UV · Docker

# Start all services (recommended)
./run.sh
./run.sh --no-debug    # INFO logging instead of DEBUG

Or start each service manually:

# Start database only
docker-compose up -d postgres

# Backend
cd backend && uv sync && uv run alembic upgrade head
uv run uvicorn app.main:app --reload --port 10105

# Frontend (separate terminal)
cd frontend && bun install && bun run dev

Validation (lint + typecheck + tests):

./check.sh    # Run all checks — required before pushing

Or run individually:

cd frontend && bun run lint && bun run typecheck
cd backend  && uv run ruff check . && uv run ruff format .

📄 License

This project is licensed under the Commons Clause applied to the MIT License. In other words, Heym is source-available rather than OSI-open-source. See the LICENSE file for details.

TL;DR: You are free to use, modify, distribute, and self-host this software — but you may not sell it or offer it as a paid service. Commercial licensing is available for teams that need those rights.

💬 Community

Join our Discord to connect with the community, ask questions, share workflows, and stay up to date:

🏢 Enterprise

Commercial use, enterprise licensing, and professional support are available.

What we offer:

Workflow automation infrastructure & deployment
Custom feature development on Heym
Debugging, troubleshooting & solution support
Priority support & SLA guarantees

📧 Contact: support@heym.run

Built with ❤️ using Vue.js, FastAPI, and a lot of LLM tokens.

⭐ Star this repo · 🐛 Report a bug · 💡 Request a feature

⭐ Star History

Contributors

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