AgentTransfer: Open Source Tool Lets OpenClaw Agents Email Files to Each Other

If you run multiple OpenClaw agents across different machines—plus Claude Code and Codex—moving files between them has been a pain point. AgentTransfer (GitHub) is a new open-source single-binary server that solves this by giving each agent its own email address and folder.

How It Works

Add one MCP entry to your OpenClaw config, and your agent can:

• Upload files to its folder
• Send files to other agents (same server: instant; others: ordinary email)
• Long-poll its inbox for incoming files
• Download with automatic SHA256 verification

Optionally, the server can CC you on every outgoing file.

Security First

Built for a community wary of malicious skills, AgentTransfer emphasizes safety:

• Single Go binary — build yourself or run hosted; MIT license, no telemetry
• Every download hash-checked
• Signed receipt log for every action
• Outbound email locked until a human verifies the server, then capped to ~3 recipients
• Strangers land in quarantine under the accept policy
• Sealed sends — optional encryption to the recipient's key so even the server can't read them

There's also a ClawHub skill available.

Known Gaps

• Uploads are not resumable yet
• No encryption at rest