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Closing the Loop: A Self-Evolving Defense
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Connect to everything your agents need, without writing the infrastructure to get there.

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Retool MCP Server
for AI Agents

Connect your AI agent to StackOne's Retool MCP server and give it 44 MCP tools out of the box. Auth, tool execution, and security all managed.

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Retool MCP Server
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44 Agent Actions

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

MCP Actions → Build Actions →

Authentication

Agent Tool Authentication

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

Agent Auth →

Security

Agent Protection

Every Retool 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 Retool call.

Tools Discovery →

What is the Retool MCP Server?

A Retool MCP server lets AI agents read and write Retool data through the Model Context Protocol — Anthropic's open standard for connecting LLMs to external tools. StackOne's Retool MCP server ships with 44 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 Retool MCP Tools

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

Custom Component Librarys

  • Create Custom Component Library

    Create a new custom component library

  • Get Custom Component Library

    Get a custom component library by ID

Folders

  • Create Folder

    Create a new folder

  • List Folders

    Get all folders in the organization

  • Get Folder

    Get a folder by ID

  • Update Folder

    Update a folder by ID

  • Delete Folder

    Delete a folder by ID

Groups

  • Create Group

    Create a new permission group

  • List Groups

    Get all permission groups

  • Get Group

    Get a group by ID

  • Update Group

    Update a group using JSON Patch

  • Delete Group

    Delete a permission group

Resources

  • List Resources

    Get all resources in the organization

  • Delete Resource

    Delete a resource by ID

Roles

  • Create Role

    Create a new role

  • List Roles

    Get all roles in the organization

  • Update Role

    Update a role by ID

  • Delete Role

    Delete a role by ID

Spaces

  • Create Space

    Create a new child space

  • List Spaces

    Get all child spaces

  • Get Space

    Get a space by ID

  • Update Space

    Update a space by ID

  • Delete Space

    Delete a space by ID

User Invites

  • Create User Invite

    Create a new user invite

  • List User Invites

    Get all user invites in the organization

  • Get User Invite

    Get a user invite by ID

  • Delete User Invite

    Delete a user invite by ID

Users

  • Create User

    Create a new user in the organization

  • List Users

    Get all users in the organization

  • Get User

    Get a specific user by ID

  • Update User

    Update a user by ID

  • Delete User

    Disable a user from the organization

Workflows

  • List Workflows

    Get all workflows in the organization

  • Get Workflow

    Get a workflow by ID

Other (10)

  • Add Users To Group

    Add users to a permission group

  • Copy Elements To Another Space

    Copy apps, queries, resources, and workflows to another space

  • Add Or Update User Attribute

    Add or update a user attribute

  • Add User Invites To Group

    Add user invites to a group

  • List Custom Component Libraries

    Get all custom component libraries in the organization

  • List Custom Component Library Revisions

    Get all revisions of a custom component library

  • Get Custom Component Library Revision Files

    Get all files for a custom component library revision

  • Get Workflow Run

    Get details for a workflow run

  • Remove User From Group

    Remove a user from a permission group

  • Remove User Invite From Group

    Remove a user invite from a group

Set Up Your Retool MCP Server in Minutes

One endpoint. Any framework. Your agent is talking to Retool 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>"
      ]
    }
  }
}

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All Developer Tools MCP Servers →

Retool Resources

The Best MCP Gateways for Retool in 2026

Best MCP gateways for Retool Agents: StackOne, Composio, Zapier, Merge, Workato compared. Retool caps 20 MCP servers per agent; audit logs skip tool calls.

9 min

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

Retool MCP Server FAQ

Does StackOne have a Retool MCP server?
Yes. StackOne offers a hosted Retool MCP server with 44 pre-built actions, 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.
Retool MCP server vs direct API integration — what's the difference?
A Retool MCP server and direct API integration serve different use cases. Direct API integration is for software-to-software — backend code calling Retool. A Retool 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 Retool at runtime. StackOne provides both.
How does Retool authentication work for AI agents?
Retool 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 Retool account; StackOne handles token exchange, storage, and refresh. Credentials never reach the LLM, and each user is isolated via origin_owner_id.
Are Retool MCP tools vulnerable to prompt injection?
Yes — Retool 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 Retool agent and how do I avoid it?
Context bloat happens when Retool tool schemas and API responses eat your Retool agent's memory, preventing it from reasoning effectively. A single Retool 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 Retool agent can access?
Yes — you can limit which actions your Retool 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 Retool MCP server?
Yes — you can create custom agent actions for your Retool MCP server using Connector Builder. It's an integration agent your coding assistant (Claude Code, Cursor, or Copilot) can invoke to research Retool's API, generate production-ready connector YAML, test against the live API, and validate before you ship.
When should I NOT use a Retool MCP server?
Skip a Retool MCP server if your integration is purely software-to-software — direct Retool 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 Retool actions at runtime.
What AI frameworks and AI clients does the StackOne Retool MCP server support?
The StackOne Retool 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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