Agent Callback Mailbox is listed as active in the registry but did not answer our last check.
Paid replay-safe callback inboxes for asynchronous agent tasks with structured MCP results.
Agent Callback Mailbox does not always answer
Over the last week it answered 0.0% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.
Connect this server
Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 11 min ago.
claude mcp add agent-callback-mailbox --transport http https://callbacks.inversolabs.us/mcphttps://callbacks.inversolabs.us/mcp[mcp_servers.agent-callback-mailbox]
url = "https://callbacks.inversolabs.us/mcp"{
"mcpServers": {
"agent-callback-mailbox": {
"url": "https://callbacks.inversolabs.us/mcp"
}
}
}{
"servers": {
"agent-callback-mailbox": {
"type": "http",
"url": "https://callbacks.inversolabs.us/mcp"
}
}
}Endpoints
| URL | Transport | State | Latency | Checked |
|---|---|---|---|---|
| https://callbacks.inversolabs.us/mcp | streamable-http | answering | 516 ms | 11 min ago |
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Agent Callback Mailbox — questions
Answers built from our own checks of this server.