MCP server

Agent Callback Mailbox

us.inversolabs/agent-callback-mailbox

Checked 26 Oct 2026, 08:29 UTC · Connection failed

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

Failed last checkVerified publisher: inversolabs.us

https://callbacks.inversolabs.us/mcp

At a glance

Type: MCP server
Publisher: inversolabs.us (verified by the MCP Registry)
Status: Failed last check
Sets up in: Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok
Last checked: 26 Oct 2026, 08:29 UTC

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.agent-callback-mailbox]
url = "https://callbacks.inversolabs.us/mcp"

Gemini CLI

{"mcpServers":{"agent-callback-mailbox":{"httpUrl":"https://callbacks.inversolabs.us/mcp"}}}

Cursor

{"mcpServers":{"agent-callback-mailbox":{"url":"https://callbacks.inversolabs.us/mcp"}}}

VS Code

{"servers":{"agent-callback-mailbox":{"type":"http","url":"https://callbacks.inversolabs.us/mcp"}}}

Antigravity

agy mcp add agent-callback-mailbox https://callbacks.inversolabs.us/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"agent-callback-mailbox","server_url":"https://callbacks.inversolabs.us/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"agent-callback-mailbox","server_url":"https://callbacks.inversolabs.us/mcp"}

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