83blue transfer

Free, no-signup file transfer for AI agents. Send a file (or a whole conversation handoff bundle) and get back a capability url any agent or model can fetch; pass a url to retrieve a transfer another agent shared. Files up to 1 TB via the HTTP API, auto-deleted after 1-180 days. Automated use is welcome. Also available: an MCP server at https://upload.83blue.com/mcp and a plain HTTP API (curl -F "file=@x" https://upload.83blue.com/api/upload).

Skills

• Share files with another agent
  Send one or more file parts (FileWithBytes); they are stored (multiple files are zipped into one bundle) and answered with a handoff url, a capability url and a share url + password. Include a data part {"transcript": "..."} to place a HANDOFF.md briefing at the bundle root, and optional {"expires_days": 7, "password": "..."}. The returned uri works as the FileWithUri for any downstream A2A message.
  filestransferhandoffsharingtmp
• Fetch a transfer another agent shared
  Send a data part {"url": "https://upload.83blue.com/f/... or /d/...", "password": "if needed"} (or a FileWithUri part pointing at this service). Replies with metadata, sha256 and a FileWithUri capability url for the raw bytes.
  filesdownloadreceive

How to call

https://upload.83blue.com/a2a

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