Connect
Optimize
Secure
Demio MCP Server
for AI Agents
Production-ready Demio MCP server with extensible actions — plus built-in authentication, security, and optimized execution.
Demio MCP Server
Built by 
StackOne
StackOne 
Coverage
6 Agent Actions
Create, read, update, and delete across Demio — and extend your agent's capabilities with custom actions.
Authentication
Agent Tool Authentication
Per-user OAuth in one call. Your Demio MCP server gets session-scoped tokens with zero credentials stored on your infra.
Agent Auth →
Security
Agent Protection
Every Demio 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 Demio call.
Tools Discovery →What is the Demio MCP Server?
A Demio MCP server lets AI agents read and write Demio data through the Model Context Protocol — Anthropic's open standard for connecting LLMs to external tools. StackOne's Demio MCP server ships with pre-built actions, fully extensible via the Connector Builder — plus managed authentication, prompt injection defense, and optimized agent context. Connect it from MCP clients like Claude Desktop, Cursor, and VS Code, or from agent frameworks like OpenAI Agents SDK, LangChain, and Vercel AI SDK.
All Demio MCP Tools and Actions
Every action from Demio's API, ready for your agent. Create, read, update, and delete — scoped to exactly what you need.
Test Connections
- Test Connection
Test API connection and verify credentials are valid.
Events
- List Events
Retrieve all events owned by the authenticated account.
- Get Event
Retrieve detailed information about a specific event.
Event Sessions
- Get Event Session
Get information about a specific event session.
Event Date Participants
- List Event Date Participants
Get participants for a specific event date.
Register Participants
- Register Participant
Register someone to an event.
Set Up Your Demio MCP Server in Minutes
One endpoint. Any framework. Your agent is talking to Demio in under 10 lines of code.
MCP Clients
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>"
]
}
}
}Demio MCP Server 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
Demio MCP Server FAQ
Demio MCP server vs direct API integration — what's the difference?
A Demio MCP server and direct API integration serve different use cases. Direct API integration is for software-to-software — backend code calling Demio. A Demio MCP server is for AI agents — MCP clients like Claude and Cursor, plus framework agents built with OpenAI, LangChain, or Vercel AI — discovering and calling Demio at runtime. StackOne provides both.
How does Demio authentication work for AI agents?
Demio authentication for AI agents works through a StackOne Connect Session. Create one via the dashboard or the SDK — you get an auth link and ready-to-paste config for Claude Desktop, Cursor, and other MCP clients. Your user authenticates their own Demio account; StackOne handles token exchange, storage, and refresh. Credentials never reach the LLM, and each user is isolated via
origin_owner_id.Are Demio MCP tools vulnerable to prompt injection?
Yes — Demio MCP tools can be vulnerable to indirect prompt injection. Any tool that reads user-written content — documents, messages, tickets, records, or free-text fields — is a potential vector. StackOne Defender scans every tool response before it enters the agent's context — regex patterns in ~1ms, then a MiniLM classifier in ~4ms. 88.7% accuracy, CPU-only.
What is the context bloat of a Demio agent and how do I avoid it?
Context bloat happens when Demio tool schemas and API responses eat your Demio agent's memory, preventing it from reasoning effectively. A single Demio query can return a massive JSON response, and connecting multiple tools compounds the problem. Tools Discovery and Code Mode reduce context bloat — loading only relevant tools per query and keeping raw responses out of the agent's context.
Can I limit which actions my Demio agent can access?
Yes — you can limit which actions your Demio agent can access directly from the StackOne dashboard. Toggle actions on or off, or restrict them to specific accounts, with no code changes to your agent. Session tokens can be scoped to exact actions so if one leaks, exposure stays contained.
Can I create custom agent actions for my Demio MCP server?
Yes — you can create custom agent actions for your Demio MCP server using Connector Builder. It's an integration agent your coding assistant (Claude Code, Cursor, or Copilot) can invoke to research Demio's API, generate production-ready connector YAML, test against the live API, and validate before you ship.
When should I NOT use a Demio MCP server?
Skip a Demio MCP server if your integration is purely software-to-software — direct Demio API integration is simpler when no AI agent is involved. For deterministic, compliance-critical operations (financial transactions, regulatory reporting), direct API gives you predictable behavior without agent-driven decision-making. MCP shines when AI agents need to dynamically discover and call Demio actions at runtime.
What AI frameworks and AI clients does the StackOne Demio MCP server support?
The StackOne Demio MCP server supports both. MCP clients (paste-and-go apps): Claude Desktop, Claude Code, Cursor, VS Code, Goose. Agent frameworks (code SDKs you build with): OpenAI Agents SDK, Anthropic, Vercel AI, Google ADK, CrewAI, Pydantic AI, LangChain, LangGraph, Azure AI Foundry.
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.