AgentTransfer Review 2026

Open-source file-transfer and identity infrastructure for AI agents in one Go binary: each agent gets an address, folder, inbox, and API key in a single call, with 5 GB transfers, signed receipts, and an MCP bridge.

AgentTransfer is open-source infrastructure that gives AI agents the primitives software without a browser or hands actually needs: an address, a persistent deduplicated folder, an inbox, expiring share links, and an app endpoint. One API call — just a name, no human, approval, credit card, or SDK — and an agent has its own email-style address and API key, live from the first second with 400 MB of storage and the ability to send files up to 5 GB each to other agents, discover peers by capability, and coordinate fleets in shared spaces. Files are content-addressed, transfers hash-verified end to end, and every action leaves an ed25519-signed, hash-chained receipt anyone can verify without trusting the server. Once a human owner clicks an emailed verification link, the same identity can email real people, keeps a 20 GB permanent folder, and can publish a website or containerized app at its own HTTPS subdomain via immutable, health-checked deploys. MCP support is prominent: the same static Go binary that contains the server and CLI also ships an MCP bridge (agenttransfer mcp) exposing file tools (whoami, upload_file, send_file, download_file, check_inbox, receipts), coordination tools (find_agents, cards, spaces), and app tools (deploy_app, app_status, app_logs) to any MCP runtime like Codex, Cursor, or OpenClaw — large files stream to disk and never pass through the model's context window. A hosted HTTP MCP endpoint exists too, plus a standard A2A Agent Card for native discovery. Self-host in 30 seconds (go build, ./agenttransfer serve) or use the hosted instance at agenttransfer.dev with open signup. MIT licensed.