OpenTool is an open-source, self-hosted MCP (Model Context Protocol) server that gives AI agents like Claude, GPT, and Cursor secure, authenticated access to tools like GitHub, Notion, Slack, and more. It is the open-source alternative to Arcade.dev.

What is an MCP server?

MCP (Model Context Protocol) is a standard by Anthropic that lets AI agents call external tools securely. An MCP server handles authentication, tool execution, and security so your agent can create GitHub issues, send Slack messages, or query databases.

How is OpenTool different from Arcade.dev?

OpenTool is fully open-source (MIT licensed), self-hosted (runs on your infrastructure), and free forever. Your OAuth tokens and API keys never leave your server. Arcade.dev is proprietary, cloud-hosted, and paid.

Which AI agents work with OpenTool?

Any MCP-compatible agent — Claude Desktop, Cursor, Windsurf, Claude Code, and any custom agent using the MCP SDK.

How do I deploy OpenTool?

One command: docker compose up -d. OpenTool ships as a Docker image with PostgreSQL included. No external dependencies needed.

Is my data secure with OpenTool?

Yes. OpenTool runs entirely on your infrastructure. OAuth tokens are encrypted with AES-256-GCM. API keys are hashed with bcrypt. Every tool call is logged in an audit trail. Your tokens never leave your server.

Legal

Terms of Service

Last updated: April 9, 2025

These Terms of Service ("Terms") govern your access to and use of OpenTool, including our hosted service, dashboard, CLI tools, SDKs, and APIs (collectively, the "Service"). By using the Service, you agree to be bound by these Terms.

1. Acceptance of Terms

By creating an account, accessing, or using the Service, you agree to these Terms and our Privacy Policy. If you are using the Service on behalf of an organization, you represent that you have the authority to bind that organization to these Terms.

If you do not agree with these Terms, you must not use the Service.

2. Service Description

OpenTool is an open-source Model Context Protocol (MCP) server that provides a unified interface for AI agents and applications to interact with third-party services. The Service includes:

A hosted MCP server with 23+ tools across 10+ providers
A web dashboard for account management, tool configuration, and OAuth connections
A command-line interface (CLI) for local development and MCP server management
TypeScript and Python SDKs for programmatic integration
REST APIs for authentication, tool management, and execution

3. Accounts & Authentication

To use the Service, you must create an account with a valid email address and password. You are responsible for:

Maintaining the confidentiality of your account credentials and API keys
All activities that occur under your account
Notifying us immediately of any unauthorized access or security breach
Ensuring your contact information is accurate and up to date

We reserve the right to suspend or terminate accounts that violate these Terms or compromise the security of the Service.

4. Acceptable Use

You agree not to use the Service to:

Violate any applicable laws, regulations, or third-party rights
Transmit malware, spam, or any harmful or disruptive content
Attempt to gain unauthorized access to our systems or other users' accounts
Reverse-engineer, decompile, or attempt to extract the source code of our hosted service (the open-source codebase is freely available)
Use the Service for any illegal, fraudulent, or abusive purpose
Circumvent rate limits, authentication mechanisms, or other security measures
Resell access to the Service without our explicit written consent
Use the Service in a way that degrades performance for other users

5. Third-Party Integrations

The Service allows you to connect third-party services (GitHub, Google, Slack, Notion, Linear, Vercel, Resend) through OAuth authorization. By connecting a third-party service:

You authorize OpenTool to access and interact with that service on your behalf, within the scope of permissions you grant
You acknowledge that third-party services are governed by their own terms of service and privacy policies
You understand that OpenTool is not responsible for the availability, accuracy, or security of third-party services
You may disconnect any provider at any time, which will immediately revoke our access

Tool executions interact with live data on your connected accounts. Actions performed through OpenTool (e.g., creating a GitHub issue, sending an email) are real and may not be reversible.

6. API Usage & Rate Limits

The Service enforces rate limits to ensure fair usage and platform stability. Current limits include:

Endpoint	Limit
Authentication routes	20 requests / minute / IP
API key management	20 requests / minute / IP
Tool execution (MCP)	Subject to provider rate limits
General API	Reasonable use; no hard cap

Exceeding rate limits will result in HTTP 429 responses. Persistent abuse may result in temporary or permanent suspension.

7. Intellectual Property

OpenTool is open-source software released under the MIT License. You are free to use, modify, and distribute the source code in accordance with that license.

The OpenTool name, logo, and branding are trademarks of the OpenTool project. You may not use these marks in a way that implies endorsement or affiliation without written permission.

You retain all rights to the data you submit through the Service. We claim no ownership over your content, code, or data processed through tool executions.

8. Self-Hosting

OpenTool can be self-hosted under the MIT License. If you choose to self-host:

You are solely responsible for the security, availability, and compliance of your self-hosted instance
These Terms of Service apply only to the hosted service at opentool.space, not to self-hosted instances
We provide no warranty, support, or SLA for self-hosted deployments
You must comply with the MIT License terms when distributing modified versions

9. Disclaimers

THE SERVICE IS PROVIDED "AS IS" AND "AS AVAILABLE" WITHOUT WARRANTIES OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT.

We do not warrant that the Service will be uninterrupted, error-free, or secure. We do not guarantee the accuracy or completeness of any data returned by tool executions. Third-party service outages are beyond our control.

10. Limitation of Liability

TO THE MAXIMUM EXTENT PERMITTED BY LAW, OPENTOOL AND ITS MAINTAINERS SHALL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES, INCLUDING BUT NOT LIMITED TO LOSS OF PROFITS, DATA, OR BUSINESS OPPORTUNITIES, ARISING OUT OF OR RELATED TO YOUR USE OF THE SERVICE.

Our total aggregate liability for any claims arising from the Service shall not exceed the amount you paid us in the twelve (12) months preceding the claim, or $50 USD, whichever is greater.

11. Termination

You may terminate your account at any time by deleting it through the dashboard or contacting us. Upon termination:

All API keys will be immediately revoked
All OAuth provider connections will be disconnected and tokens deleted
Your account data will be permanently deleted within 30 days
Any cached data will be purged from Redis immediately

We reserve the right to suspend or terminate your access if you violate these Terms, abuse the Service, or if required by law. We will provide notice where reasonably possible.

12. Changes to These Terms

We may revise these Terms from time to time. Material changes will be communicated through the dashboard or via email at least 14 days before taking effect. Continued use of the Service after the effective date constitutes acceptance. If you disagree with the changes, you must stop using the Service and delete your account.

13. Governing Law

These Terms shall be governed by and construed in accordance with the laws of India, without regard to conflict of law principles. Any disputes arising from these Terms or the Service shall be resolved through good-faith negotiation first, and if necessary, through binding arbitration.

14. Contact

For questions or concerns about these Terms, please reach out:

Email: legal@opentool.space

GitHub: Open an issue

OpenTool is open-source software released under the MIT License. These terms apply to the hosted service at opentool.space. Self-hosted instances are governed by the operator's own terms.