83blue Transfer

Free, no-signup file transfer for AI agents. Upload with one request, hand the returned url to any other agent, model, machine or human. No accounts, no API keys, no cookies. Files up to 1 TB, auto-deleted after 1-180 days. Automated use is welcome.

This repo is the official Agent Plugin for the service (works with ChatGPT, Codex, Cursor, GitHub Copilot, Kiro and VS Code) plus copy-paste examples for everything else.

Send a file

# transfer.sh style: raw PUT, plain-text url back
curl --upload-file ./report.zip https://upload.83blue.com/report.zip

# richer JSON (capability_url, handoff_url, password, sha256)
curl -F "[email protected]" https://upload.83blue.com/api/upload

Receive a file

curl -fL -OJ "https://upload.83blue.com/f/TOKEN/KEY/report.zip"

Delete when done

curl -X DELETE "https://upload.83blue.com/f/TOKEN/KEY"

MCP server (no auth)

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

Tools: share_file, share_text, share_conversation (packages a transcript plus files behind one handoff url any model can fetch for a full briefing) and receive_file. Listed in the official MCP registry as com.83blue.upload/transfer.

# Claude Code
claude mcp add --transport http transfer https://upload.83blue.com/mcp
# Codex CLI
codex mcp add upload83blue --url https://upload.83blue.com/mcp
# Gemini CLI
gemini mcp add --transport http upload83blue https://upload.83blue.com/mcp

Setup for Cursor, VS Code, ChatGPT, Grok, Windsurf, Cline, Zed, JetBrains, Warp and Raycast: https://upload.83blue.com/docs#mcp

Install as an Agent Plugin

npx plugins add 1983ltd/83blue-transfer

Or add this repo as a plugin marketplace/source in Codex, Copilot CLI, Cursor or VS Code.

A2A

Agent card: https://upload.83blue.com/.well-known/agent-card.json (JSON-RPC endpoint at /a2a, protocol 0.3.0). Works as the hosting layer for any A2A FileWithUri part.

The handoff pattern

Agent A uploads everything the next agent needs (HANDOFF.md briefing at the zip root), then passes one url. Agent B fetches it and picks up the whole context:

Pick up where I left off. Fetch this url for the full briefing and files:
https://upload.83blue.com/h/TOKEN/KEY

Limits

Thing	Limit
Max file size	1 TB (chunked); 512 MB single request; 100 MB per MCP call
Retention	1-180 days (default 180 HTTP, 30 MCP)
Simultaneous uploads	3 site-wide (429 + Retry-After when full: just retry)
Download speed	1 Mbit/s per connection, 3 connections per IP
Price	Free, within fair use

Machine-readable docs: llms.txt · OpenAPI 3.1 · full reference

Abuse reports: https://upload.83blue.com/report · Terms: https://upload.83blue.com/terms