• ERROR
  • SUCCESS
  • DATA
  • HUMAN

How to debug workflow execution traces with your AI

Connect Fastn to your AI client once. After that, you can just ask your agent to find and explain errors in your backend workflows.

Ask AI about this page

Short answer

How can I use AI to find workflow errors?

Your AI uses the Fastn connector to pull specific execution data and step-by-step logs. It identifies the exact node or logic gate that caused a failure. You get a clear breakdown of the error source and the data state at the time of failure.

Where every issue lands.

Debugging outcomes

The AI categorizes what it finds in your execution history.

ERROR

Failed execution points

The AI uses execution data to pinpoint the specific step where a process stopped. You get the error message and the context of the failure.

SUCCESS

Completed paths

The AI reviews successful runs to confirm that logic is behaving as expected. This helps you compare failed runs against working ones.

DATA

Variable state checks

The AI inspects the inputs and outputs of each step. It tells you if a null value or a type mismatch broke your flow.

HUMAN

Manual fixes needed

The AI flags issues it can't solve, like broken third-party API credentials or logic flaws. You decide how to patch the workflow.

The workflow

What your AI does when a failure occurs.

The AI moves from broad history to specific error details.

  1. Scan history

    The AI looks through your recent activity to find relevant runs.

    list_executions

  2. Fetch details

    The AI pulls the full trace for a specific failed run to see the step-by-step data.

    get_execution

  3. Analyze logs

    The AI compares the expected output against the actual data received at each node.

    get_execution

  4. Report findings

    The AI summarizes the root cause and suggests where the logic went wrong.

    list_executions

Try it

Copy these to start.

Use these prompts to begin debugging immediately.

Starting points

Swap out the bracketed text for your actual workflow IDs or execution names.

Fastn Connector

You're all set. Choose your MCP client and follow the setup instructions.

Connector linkhttps://edge.vinkius.com/vk_preview_wa4bKnlUgLKkNcgy1RPaz1zwlTmtw2evOT0C54sb/mcp

Claude Desktop

Follow the steps below to connect in seconds.

  1. 1In Claude Desktop, open Settings → Connectors.
  2. 2Click “Add custom connector” and paste the connector link above as the remote MCP server URL.
  3. 3Click Add and start a new chat — Fastn capabilities are ready to use.
Configuration · claude_desktop_config.jsonCopy
{
  "mcpServers": {
    "fastn-mcp": {
      "url": "https://edge.vinkius.com/vk_preview_wa4bKnlUgLKkNcgy1RPaz1zwlTmtw2evOT0C54sb/mcp"
    }
  }
}
Copy into chat04

  • List my most recent executions in Fastn so I can find the failed one.

  • Get the execution trace for run ID [ID_HERE] and tell me why it failed.

  • Look at the last five executions and tell me if there is a pattern in the errors.

  • Check the execution details for [ID_HERE] and find where the variable [NAME] became null.

  • Claude
  • ChatGPT
  • Cursor
  • VS Code
  • Windsurf
  • Claude Code
  • JetBrains
  • Cline

Start here

Connect Fastn once, then ask.

One click connects your client to Fastn. Your credentials stay encrypted and secure on our side.

Connect Fastn to your AI

FAQ

How the debugging task behaves

  • 01

    Can the AI fix the workflow errors automatically?

    No. The AI identifies the error and explains the cause, but you must manually edit the workflow in Fastn to apply fixes.

  • 02

    Can the AI delete old execution logs?

    No. The tools only allow the AI to read and list execution data. It cannot delete or modify your history.

  • 03

    How does the AI know which execution to look at?

    You tell it. You can provide a specific execution ID or ask it to list recent runs to find the right one.

  • 04

    Does the AI have access to my Fastn login credentials?

    No. Vinkius manages the connection securely. Your AI client only uses the tools provided through the MCP.

  • 05

    Can the AI see the data passed between steps?

    Yes. By pulling the execution trace, the AI can see the specific inputs and outputs for every step in the process.

  • More questions about Fastn? The Connector page answers them. See everything the Fastn Connector can do

Connect Fastn to Claude, Cursor, ChatGPT & more