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Connectors
Connect

Connect to everything your agents need, without writing the infrastructure to get there.

Secure

Enterprise-grade controls to ensure your agent always meets security & compliance standards.

Optimize

Maximise agent efficiency – faster responses, increased accuracy, fewer tokens used.

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Live 13 Actions

Reo.dev MCP Server
for AI Agents

Connect your AI agent to StackOne's Reo.dev MCP server and give it ready-to-use MCP tools out of the box. Auth, tool execution, and security all managed.

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Reo.dev MCP Server
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Coverage

13 Agent Actions

Create, read, update, and delete across Reo.dev — and extend your agent's capabilities with custom actions.

MCP Actions → Build Actions →

Authentication

Agent Tool Authentication

Per-user OAuth in one call. Your Reo.dev MCP server gets session-scoped tokens with zero credentials stored on your infra.

Agent Auth →

Security

Agent Protection

Every Reo.dev 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 Reo.dev call.

Tools Discovery →

What is the Reo.dev MCP Server?

A Reo.dev MCP server lets AI agents read and write Reo.dev data through the Model Context Protocol — Anthropic's open standard for connecting LLMs to external tools. StackOne's Reo.dev 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 Reo.dev MCP Tools

Every action from Reo.dev's API, ready for your agent. Create, read, update, and delete — scoped to exactly what you need.

Segments

  • List Segments

    List all segments in your Reo.dev account with pagination support.

Segment Accounts

  • List Segment Accounts

    List all accounts within a specific segment, with pagination.

Account Activities

  • Get Account Activities

    Get the activity history for a specific account.

Account Details

  • Get Account Details

    Look up an account by organization ID or domain.

Account Developers

  • List Account Developers

    List all developers associated with a specific account, with pagination.

Segment Developers

  • List Segment Developers

    List all developers within a specific segment, with pagination.

Developer Activities

  • Get Developer Activities

    Get the activity history for a specific developer.

Segment Buyers

  • List Segment Buyers

    List all buyers within a specific segment, with pagination.

Audiences

  • List Audiences

    List all audiences in your Reo.dev account.

Audience Members

  • List Audience Members

    List all members of a specific audience, with pagination.

Lists

  • List Lists

    List all custom lists in your Reo.dev account.

Create Lists

  • Create List

    Create a new custom list of accounts or developers.

To Lists

  • Add To List

    Add accounts or developers to an existing list.

Reo.dev AI Agent Use Cases

Connect your AI agent to Reo.dev and help your team scale the marketing operations they run by hand today.

Lead Nurture Sequences

Use StackOne to connect your AI agent to your marketing automation, CRM, and email tools to automate lead nurture email sequences.

View
HubSpotSalesforceActiveCampaignKlaviyoSendGridMailchimpLemlistGmail
Campaign Performance Reports

Use StackOne to connect your AI agent to your marketing automation, email, and analytics platforms to automate campaign performance reporting.

View
HubSpotMailchimpActiveCampaignKlaviyoSalesforceBrazeSendGridMarketo
Post-Demo Follow-Up

Use StackOne to connect your AI agent to your CRM, email, and calendar tools to automate post-demo follow-up.

View
SalesforceHubSpotPipedriveGongFirefliesGmailMicrosoft OutlookGoogle Calendar
More Marketing Automation use cases More Sales & CRM use cases

Set Up Your Reo.dev MCP Server in Minutes

One endpoint. Any framework. Your agent is talking to Reo.dev in under 10 lines of code.

MCP Clients

Claude Desktop setup guide
Claude Code setup guide
Cursor setup guide
Goose setup guide

Agent Frameworks

Claude Desktop
{
  "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 Marketing Automation MCP Servers

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172+ actions

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127+ actions

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113+ actions

SendGrid

110+ actions

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98+ actions

Mailchimp

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All Marketing Automation MCP Servers →

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 200+ Connector Builds Taught Us

MCP wraps APIs, it doesn't replace them. After building 200+ connectors that serve both, here's when each approach wins.

14 min read

Reo.dev MCP Server FAQ

Does StackOne have a Reo.dev MCP server?
Yes. StackOne offers a hosted Reo.dev MCP server, and every action is tested and QA'd by StackOne. Connect it to Claude, Cursor, and any other MCP client, or to any agent framework through the AI Action SDK. It ships with managed agent authentication, prompt injection defense, and tool discovery with server-side execution that preserve your agent's context window and keep reasoning performance.
Reo.dev MCP server vs direct API integration — what's the difference?
A Reo.dev MCP server and direct API integration serve different use cases. Direct API integration is for software-to-software — backend code calling Reo.dev. A Reo.dev 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 Reo.dev at runtime. StackOne provides both.
How does Reo.dev authentication work for AI agents?
Reo.dev 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 Reo.dev account; StackOne handles token exchange, storage, and refresh. Credentials never reach the LLM, and each user is isolated via origin_owner_id.
Are Reo.dev MCP tools vulnerable to prompt injection?
Yes — Reo.dev 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 Reo.dev agent and how do I avoid it?
Context bloat happens when Reo.dev tool schemas and API responses eat your Reo.dev agent's memory, preventing it from reasoning effectively. A single Reo.dev 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 Reo.dev agent can access?
Yes — you can limit which actions your Reo.dev 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 Reo.dev MCP server?
Yes — you can create custom agent actions for your Reo.dev MCP server using Connector Builder. It's an integration agent your coding assistant (Claude Code, Cursor, or Copilot) can invoke to research Reo.dev's API, generate production-ready connector YAML, test against the live API, and validate before you ship.
When should I NOT use a Reo.dev MCP server?
Skip a Reo.dev MCP server if your integration is purely software-to-software — direct Reo.dev 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 Reo.dev actions at runtime.
What AI frameworks and AI clients does the StackOne Reo.dev MCP server support?
The StackOne Reo.dev 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.

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All the tools you need to build and scale AI agent integrations, with best-in-class connectivity, execution, and security.

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