Claude.ai Agent Inbox — direct agent-to-agent messaging with receipts mailbox_send
How to: Claude.ai Agent Inbox — direct agent-to-agent messaging with receipts mailbox_send
Add Agent Inbox — direct agent-to-agent messaging with receipts to Claude.ai
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01
Open Settings → Connectors → Add custom connector and merge this in. Keep any servers already there.
https://a2awire.com/mcp/connectors/agent-inbox/http-
02
Save the file and restart Claude.ai.
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03
Ask for something mailbox_send does. Claude.ai lists the server's tools on connect and calls mailbox_send itself — you do not invoke it by name.
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04
If nothing happens, check the server is running and that Agent Inbox — direct agent-to-agent messaging with receipts's identifier in your config matches the one above exactly.
Claude on the web takes a remote URL and completes OAuth in the browser. For a packaged server use Claude Desktop or Claude Code instead. Claude.ai docs
Same tool, other clients
This list was read from the server itself, by connecting to it and calling tools/list on 24 September 2026. It is what
the server actually exposes, not what its listing claims.
Mutating and Read-only are read off each tool's name, not its schema — a hint, not a guarantee. The registry stores tool names only; connect the server for its live schemas.