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Agent Callback Mailbox

Official registry AI and agents

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

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http agent-callback-mailbox 'https://callbacks.inversolabs.us/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "agent-callback-mailbox": {
            "type": "http",
            "url": "https://callbacks.inversolabs.us/mcp"
        }
    }
}

Frequently asked questions

What is Agent Callback Mailbox?

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

How do I install Agent Callback Mailbox?

It runs as a remote server. In Claude Code: claude mcp add --transport http agent-callback-mailbox 'https://callbacks.inversolabs.us/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Agent Callback Mailbox need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Who maintains Agent Callback Mailbox?

It is published by us.inversolabs. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.