How to Use the Fastn MCP in Claude

Q: How do I install the Fastn MCP Server on Claude Desktop?

Open your claudedesktopconfig.json file and add the server configuration under the mcpServers key with the execution arguments. Save the file and restart Claude Desktop to see the new tools appear in your chat input.

Q: How does Claude Desktop handle my Fastn connector credentials?

Your agent uses the Fastn MCP Server tools like storecredentials and rotatecredentials to manage keys securely inside your environment. Sensitive data is never stored locally in your Claude Desktop configuration files.

Run and monitor your Fastn automation workflows directly from Claude Desktop without touching a terminal.

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Connect Fastn MCP to Claude Desktop

Create your Vinkius account to connect Fastn to Claude Desktop and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup Fastn with Claude Desktop

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Build and deploy workflows inside Claude Desktop

Your desktop agent uses `create_workflow` and `update_workflow` to build, modify, and deploy complex automation flows directly inside your chat interface. By invoking these tools, Claude Desktop writes the underlying JSON definitions for you based on simple plain-English instructions. You do not have to copy-paste configuration blocks back and forth between your browser and editor. Once the logic looks right, you can push it live immediately. The agent triggers `publish_workflow` to deploy the flow to your active tenant, or calls `archive_workflow` to take old automation steps offline. It turns your chat window into a visual control center for your entire low-code backend.

Run and monitor executions with your MCP Server

Running tests on your automation steps usually requires triggering `execute_flow` instantly with whatever payload you specify in the chat. You get to see the real-time API sync results without leaving your primary workspace. If a run hangs or throws an unexpected error, you can inspect the plumbing immediately. Instruct your agent to run `get_execution` to pull the complete step-by-step trace or cancel a stuck run using `cancel_execution`. This brings deep observability into your live systems right where you discuss code.

Manage API keys and connector credentials securely

Managing external API keys is simple when your Claude Desktop MCP client calls `store_credentials` to encrypt and save them directly within your environment. This keeps your sensitive tokens out of plain-text configuration files. When it is time to update your connections, your agent uses `rotate_credentials` to swap old keys for new ones. You can also inspect existing setups with `get_credentials` to verify that your integrations have the correct access. Your secrets remain protected while staying fully accessible to your automated steps.

Setup guide

Set up Fastn MCP in Claude Web or Desktop

1

Open Claude Settings

Go to claude.ai, click your profile icon, then navigate to Customize → Connectors.
2

Add Custom Connector

Click the "+" button and select Add custom connector. Paste your Vinkius endpoint URL: https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. For OAuth-protected servers, expand Advanced settings to add credentials.
3

Start a conversation

Open a new chat. The Fastn MCP tools are available immediately — no restart needed.

Endpoint URL

https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp

No configuration file needed — paste the URL directly in the Claude web interface.

Available on Free (1 connector), Pro, Max, Team, and Enterprise plans.

Prerequisites

Claude Desktop installed (macOS or Windows)
Active Vinkius subscription with a valid endpoint token

1

Open Claude Desktop Settings

Click the menu icon at the top-left corner, go to Settings → Developer → Edit Config. This opens claude_desktop_config.json in your default text editor.
2

Paste the Fastn MCP configuration

Copy the JSON snippet on the right into the mcpServers object. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Restart Claude Desktop

Close and reopen the application. Claude needs a full restart to load new MCPs — refreshing a conversation is not enough.
4

Verify the connection

Open a new conversation. Click the 🔌 icon at the bottom of the message input. You should see tools listed under fastn-mcp.

json

{
  "mcpServers": {
    "fastn-mcp": {
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

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Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by Fastn. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Common questions about Fastn MCP in Claude Desktop

Open your `claude_desktop_config.json` file and add the server configuration under the `mcpServers` key with the execution arguments. Save the file and restart Claude Desktop to see the new tools appear in your chat input.

Yes, you can ask your agent to run any active flow by name. The agent will call the `execute_flow` tool, pass the required payload, and show you the execution results right in the conversation.

Your agent uses the Fastn MCP Server tools like `store_credentials` and `rotate_credentials` to manage keys securely inside your environment. Sensitive data is never stored locally in your Claude Desktop configuration files.

Absolutely, you can ask your agent to investigate any failed run. It will invoke `list_executions` to find the failing run ID and then call `get_execution` to parse the exact step that failed.

Yes, because the server only accesses workflow definitions and execution traces through secure API tokens. Your raw business data and connection secrets are handled by Vinkius's zero-trust sandboxed execution layer.

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