• STALLED
  • LOCATION
  • ACTION
  • HUMAN

How to debug failed multipart uploads with your AI

Connect your B2 account once. After that, your AI handles the heavy lifting of finding broken transfers.

Ask AI about this page

Short answer

How do I find failed multipart uploads in B2?

Your AI scans your buckets to identify unfinished large file chunks that are taking up space. It provides a clear list of stalled transfers so you can clean them up. You'll see exactly which files are stuck and where they live.

Where the issues land.

Stalled upload outcomes.

The AI categorizes every stalled upload it finds.

STALLED

Unfinished chunks

The AI identifies specific parts of a large file that never completed. You get a list of these partial uploads.

LOCATION

Bucket mapping

The AI maps every failed transfer to its specific bucket. This tells you exactly where the storage bloat is happening.

ACTION

Cleanup prep

The AI organizes the data so you can decide which chunks to delete. It prepares the ground for manual cleanup.

HUMAN

Manual deletion

The AI identifies the files but won't delete them. You must decide which unfinished parts to remove yourself.

The workflow

What your AI does when the task arrives.

The AI moves through your B2 storage to find the gaps.

  1. Secure access

    The AI establishes a secure connection to your B2 account to begin the scan.

    authorize_account

  2. Identify buckets

    The AI pulls a list of all your available buckets to know where to look.

    list_buckets

  3. Scan for chunks

    The AI looks inside each bucket for any large file uploads that haven't finished.

    list_unfinished_large_files

  4. Report findings

    The AI presents a summary of every stalled upload it located during the scan.

    list_unfinished_large_files

Try it

Copy these to start.

Use these prompts to kick off the debugging process.

Starting points

These are basic starting lines. Swap out the bucket names for your actual B2 bucket names.

Backblaze B2 Connector

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

Connector linkhttps://edge.vinkius.com/vk_preview_5a3X16pxhWkIfWLEFFNd17FkP9i7b4YBIqYHMeDV/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 — Backblaze B2 capabilities are ready to use.
Configuration · claude_desktop_config.jsonCopy
{
  "mcpServers": {
    "backblaze-b2-mcp": {
      "url": "https://edge.vinkius.com/vk_preview_5a3X16pxhWkIfWLEFFNd17FkP9i7b4YBIqYHMeDV/mcp"
    }
  }
}
Copy into chat04

  • Find all unfinished multipart uploads in my 'production-data' bucket.

  • List all stalled large file chunks across all my B2 buckets.

  • Check my 'backups' bucket for any incomplete uploads.

  • Show me a summary of unfinished file parts in my B2 storage.

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

Start here

Connect Backblaze B2 once, then ask.

One connection gives your AI access. Your credentials stay encrypted and the setup instructions are on the Connector page.

Connect Backblaze B2 to your AI

FAQ

How this task behaves.

  • 01

    Can the AI delete the unfinished chunks for me?

    No. The AI only identifies and lists the unfinished files. You have to perform the actual deletion yourself.

  • 02

    Does the AI scan every single file in my bucket?

    No. It specifically targets unfinished multipart uploads, not completed files.

  • 03

    Will this affect my active uploads?

    No. The AI only reads the metadata for unfinished chunks; it doesn't interfere with ongoing transfers.

  • 04

    How does the AI know which bucket to check?

    You tell it which bucket to check in your prompt, or you can ask it to scan all buckets it finds.

  • 05

    Can the AI create new buckets?

    No. This MCP is designed for inspecting and finding stalled uploads, not for managing bucket creation.

  • More questions about Backblaze B2? The Connector page answers them. See everything the Backblaze B2 Connector can do

Connect Backblaze B2 to Claude, Cursor, ChatGPT & more