How to Use the Fastn MCP in Claude Code

Q: Can I use Claude Code to debug a failed Fastn run?

Yes. Claude Code uses listexecutions to find recent failures and queries getexecution to print the full step-by-step trace right in your shell for quick debugging.

Q: How does Claude Code handle Fastn credential rotation?

Claude Code calls rotatecredentials directly from your command line. It updates the required tokens in your secure storage vault without exposing the raw secret values in your shell history.

Q: Where are the execution traces processed by this MCP Server stored?

Execution traces retrieved via getexecution remain on Fastn's secure tenant database. Claude Code only pulls them temporarily into your local terminal session buffer for display, ensuring no persistent storage on third-party servers.

Manage and execute Fastn automation pipelines directly from your terminal using Claude Code.

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Create your Vinkius account to connect Fastn to Claude Code 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 Code

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Headless workflow execution

The `execute_flow` tool triggers your Fastn automations directly from the command line interface via the MCP Server interface. Claude Code pipes terminal outputs or local file contents straight into the workflow trigger, letting you run complex pipelines without opening a browser. This setup works perfectly for CI/CD runs. You can script Claude Code to kick off a deployment flow, wait for the response, and pass the output to the next tool in your terminal pipeline.

Manage flow lifecycles with this MCP Server

The `list_workflows` tool pulls your entire library of automation definitions directly into your terminal session. Claude Code filters, searches, and inspects specific flows using `get_workflow` without leaving your shell. When you need to update a flow, Claude Code applies the edits and runs `update_workflow`. It then deploys the changes using `publish_workflow` and archives old versions using `archive_workflow` to keep your workspace clean.

Command-line secret and quota monitoring

The `store_credentials` tool manages your external integration secrets directly from the terminal. Claude Code uses this MCP connection to push API keys to your secure vault and rotates them using `rotate_credentials` whenever your security policy demands it. To prevent unexpected automation halts, Claude Code runs `get_quota_summary` to check your current limits. It monitors your daily consumption via `get_quota_daily`, keeping your terminal-based pipelines fully visible and under control.

Setup guide

Set up Fastn MCP in Claude Code

Prerequisites

Claude Code CLI installed (npm install -g @anthropic-ai/claude-code)
Active Vinkius subscription with a valid endpoint token

1

Run the add command

Open your terminal and run the command shown on the right. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com. Use --scope user to make it available across all projects.
2

Verify the connection

Start a Claude Code session and type /mcp to list connected servers. You should see fastn-mcp with a green status indicator.
3

Start using tools

Ask Claude Code something like "Check my latest Fastn transactions." It will automatically discover and invoke the available Fastn tools.

Terminal

claude mcp add --transport http fastn-mcp https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp

Get your connection token →

Prerequisites

Claude Code CLI installed
Active Vinkius subscription with a valid endpoint token

1

Open the config file

Create or edit .mcp.json in your project root for project-level scope, or ~/.claude.json for user-level scope.
2

Add the Fastn MCP

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

Restart Claude Code

Start a new Claude Code session. Type /mcp to confirm the server is connected. The tools will be automatically available in your conversation.

.mcp.json

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

Get your connection token →

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Common questions about Fastn MCP in Claude Code

Run a command telling Claude Code to trigger your flow. It will call `execute_flow` with your specified JSON payload and print the execution ID directly to your terminal.

Yes. Claude Code uses `list_executions` to find recent failures and queries `get_execution` to print the full step-by-step trace right in your shell for quick debugging.

Claude Code calls `rotate_credentials` directly from your command line. It updates the required tokens in your secure storage vault without exposing the raw secret values in your shell history.

Yes. Tell Claude Code which flow to retire. It will locate the workflow ID and call `archive_workflow` to deactivate it instantly.

Execution traces retrieved via `get_execution` remain on Fastn's secure tenant database. Claude Code only pulls them temporarily into your local terminal session buffer for display, ensuring no persistent storage on third-party servers.

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