HighLevel MCP Server
for AI Agents
Connect your AI agent to StackOne's HighLevel MCP server and give it ready-to-use MCP tools out of the box. Auth, tool execution, and security all managed.
StackOne 
Coverage
12 Agent Actions
Create, read, update, and delete across HighLevel — and extend your agent's capabilities with custom actions.
Authentication
Agent Tool Authentication
Per-user OAuth in one call. Your HighLevel MCP server gets session-scoped tokens with zero credentials stored on your infra.
Agent Auth →
Security
Agent Protection
Every HighLevel tool response scanned for prompt injection in milliseconds — 88.7% accuracy, all running on CPU.
Prompt Injection Defense →
Performance
Max Agent Context. Min Cost.
Free up to 96% of your agent's context window to enhance reasoning and reduce cost, on every HighLevel call.
Tools Discovery →What is the HighLevel MCP Server?
A HighLevel MCP server lets AI agents read and write HighLevel data through the Model Context Protocol — Anthropic's open standard for connecting LLMs to external tools. StackOne's HighLevel MCP server ships with pre-built actions, fully extensible via the Connector Builder — plus managed authentication, prompt injection defense, observability, and agent execution runtime. Connect it from MCP clients like Claude Desktop, Claude Code, Cursor, Goose, and VS Code, or from agent frameworks like OpenAI Agents SDK, LangChain, and Vercel AI SDK.
All HighLevel MCP Tools
Every action from HighLevel's API, ready for your agent. Create, read, update, and delete — scoped to exactly what you need.
Agencys
- Get Agency
Get the HighLevel agency (company) record.
Unified Credentials
- Get Unified Credentials
Get the current HighLevel connection's unified credentials and identity.
Unified Organizations
- List Unified Organizations
List unified organizations (sub-accounts) in a HighLevel agency.
- Get Unified Organization
Get a unified HighLevel organization (sub-account) by ID.
Unified Roles
- List Unified Roles
List unified roles in a HighLevel agency.
- Get Unified Role
Get a unified HighLevel role by ID.
Unified Users
- List Unified Users
List unified users in a HighLevel agency or sub-account.
- Get Unified User
Get a unified HighLevel user by ID.
Sub-Accounts
- List Sub-Accounts
Search the sub-accounts (locations) of a HighLevel agency.
- Get Sub-Account
Get a HighLevel sub-account (location) by ID.
Users
- List Users
Search agency and sub-account users in a HighLevel agency.
- Get User
Get a HighLevel user by ID.
HighLevel AI Agent Use Cases
Connect your AI agent to HighLevel and help your team scale the sales operations they run by hand today.
Use StackOne to connect your AI agent to your CRM, email, and calendar tools to automate post-demo follow-up.
ViewUse StackOne to connect your AI agent to your CRM, email, and calendar tools to automate deal risk scoring and pipeline alerts.
ViewUse StackOne to connect your AI agent to your CRM, sales engagement, and messaging tools to automate outbound prospecting.
ViewSet Up Your HighLevel MCP Server in Minutes
One endpoint. Any framework. Your agent is talking to HighLevel in under 10 lines of code.
Agent Frameworks
JSON{
"mcpServers": {
"stackone": {
"command": "npx",
"args": [
"-y",
"mcp-remote@latest",
"https://api.stackone.com/mcp?x-account-id=<account_id>",
"--header",
"Authorization: Basic <YOUR_BASE64_TOKEN>"
]
}
}
}Check More crm-sales MCP Servers
134+ actions
104+ actions
82+ actions
61+ actions
59+ actions
54+ actions
53+ actions
Platform Resources
MCP Code Mode: Keeping Tool Responses Out of Agent Context
Anthropic's code_execution processes data already in context. Custom MCP code mode keeps raw tool responses in a sandbox. 14K tokens vs 500.
11 min
Comparing BM25, TF-IDF, and Hybrid Search for MCP Tool Discovery
Benchmarking BM25, TF-IDF, and hybrid search for MCP tool discovery across 916 tools. The 80/20 TF-IDF/BM25 hybrid hits 21% Top-1 accuracy in under 1ms.
10 min
Indirect Prompt Injection Defense for MCP Tools: A Technical Guide
MCP tools that read emails, CRM records, and tickets are indirect prompt injection vectors. Here's how we built a two-tier defense that scans tool results in ~11ms.
12 min
MCP vs A2A: Architecture, Security, and When to Use Each
MCP vs A2A: what each protocol standardizes, how they differ, their shared security risks including indirect prompt injection, and when to use one, both, or a hybrid architecture.
12 min
MCP vs API: What Hundreds of Connector Builds Taught Us
MCP wraps APIs, it doesn't replace them. After building hundreds of connectors that serve both, here's when each approach wins.
14 min read
HighLevel MCP Server FAQ
Does StackOne have a HighLevel MCP server?
HighLevel MCP server vs direct API integration — what's the difference?
How does HighLevel authentication work for AI agents?
origin_owner_id.Are HighLevel MCP tools vulnerable to prompt injection?
What is the context bloat of a HighLevel agent and how do I avoid it?
Can I limit which actions my HighLevel agent can access?
Can I create custom agent actions for my HighLevel MCP server?
When should I NOT use a HighLevel MCP server?
What AI frameworks and AI clients does the StackOne HighLevel MCP server support?
Put your AI agents to work
All the tools you need to build and scale AI agent integrations, with best-in-class connectivity, execution, and security.