us.inversolabs/agent-callback-mailbox
Agent Callback Mailbox
Paid replay-safe callback inboxes for asynchronous agent tasks with structured MCP results.
error probed 2026-10-15 · HTTP 400
Streamable HTTP error: Error POSTing to endpoint: {"jsonrpc":"2.0","id":0,"error":{"code":-32602,"message":"Unsupported or incomplete MCP metadata"}}- Endpoint
- https://callbacks.inversolabs.us/mcp (streamable-http)
- Host
- callbacks.inversolabs.us
- Registry
- active, updated 2026-08-26 · registry entry
- Reachable
- 0 of the last 12 probes
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-10-15 12:02 | error | ||||
| 2026-10-14 09:41 | server error | ||||
| 2026-10-13 11:30 | no DNS | ||||
| 2026-10-12 12:02 | server error | ||||
| 2026-10-10 10:36 | no DNS | ||||
| 2026-10-09 11:38 | server error | ||||
| 2026-10-07 11:27 | no DNS | ||||
| 2026-10-05 01:03 | server error | ||||
| 2026-10-04 10:11 | no DNS | ||||
| 2026-10-04 08:04 | no DNS | ||||
| 2026-10-03 20:43 | server error | ||||
| 2026-10-03 17:58 | server error |
Badge and feed
[](https://mcpcost.ulehla.dev/s/us.inversolabs/agent-callback-mailbox)
An entry for every probe that changed the result, the tool count or the token cost: Atom feed. Add it to a feed reader or a Slack RSS app to hear when the server stops answering or its tool set grows.