What is the MCP Server?
The OpenSink MCP server lets AI tools — such as Claude Desktop, Cursor, VS Code, and other MCP-compatible clients — interact with your OpenSink resources directly. It exposes your sinks, agents, sessions, and more as MCP tools that AI assistants can call on your behalf.Connection Details
| Parameter | Value |
|---|---|
| URL | https://api.opensink.com/mcp |
| Transport | Streamable HTTP |
| Authentication | OAuth 2.0 |
| OAuth Client ID | opensink |
| OAuth Client Secret | opensink |
Setup
Configuration varies by client. Below are instructions for the most common MCP-compatible tools.- Claude Desktop
- Cursor
- Claude Code
- Other Clients
Open Settings > MCP Servers and add a new server with the following details:
- URL:
https://api.opensink.com/mcp - OAuth Client ID:
opensink - OAuth Client Secret:
opensink
Authentication
The MCP server uses OAuth 2.0 for authentication. When you connect for the first time, your client will open a browser window to complete the authorization flow. Once authorized, your client will manage token refresh automatically.You must have an OpenSink account to authenticate. If you don’t have one yet, sign up on the dashboard.
Available Tools
Once connected, your AI assistant will have access to the following tools:| Tool | Description |
|---|---|
list_sinks | List all available sinks in your workspace |
list_sink_items | List items in a sink with pagination |
add_sink_item | Add a new item to a sink |
Troubleshooting
| Problem | Solution |
|---|---|
| OAuth flow doesn’t open | Make sure your client supports OAuth 2.0. Check that the Client ID and Client Secret are both set to opensink. |
| Connection timeout | Verify the URL is exactly https://api.opensink.com/mcp with no trailing slash. |
| ”Unauthorized” error | Re-authenticate by removing and re-adding the MCP server in your client settings. |
| Tools not appearing | Ensure your OpenSink account has at least one resource created (e.g., a sink or agent). |