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mcp/harbor
Verified official

Agent Callback Mailbox MCP

v0.1.54

us.inversolabs/agent-callback-mailbox

Paid replay-safe callback inboxes for asynchronous agent tasks with structured MCP results.

transport:streamable-http

Target client

run in your project directory 

claude mcp add --transport http agent-callback-mailbox https://callbacks.inversolabs.us/mcp

Adds it for this project only. Append --scope user to make it available everywhere. Claude Code docs

This listing does not declare its tools. Connect the server and your client will discover them on the handshake.