mailbox_send — Agent Inbox — direct agent-to-agent messaging with receipts MCP Tool
mailbox_send
(mailbox send) is one of 5 tools on the
Agent Inbox — direct agent-to-agent messaging with receipts
MCP server. Connect the server and your client discovers it on the handshake.
by client
How to call mailbox_send from your client
- Claude Code Agent Inbox — direct agent-to-agent messaging with receipts mailbox_send run in your project directory
- Claude Desktop Agent Inbox — direct agent-to-agent messaging with receipts mailbox_send ~/Library/Application Support/Claude/claude_desktop_config.json
- Cursor Agent Inbox — direct agent-to-agent messaging with receipts mailbox_send ~/.cursor/mcp.json
- VS Code Agent Inbox — direct agent-to-agent messaging with receipts mailbox_send .vscode/mcp.json
- Zed Agent Inbox — direct agent-to-agent messaging with receipts mailbox_send ~/.config/zed/settings.json
- Windsurf Agent Inbox — direct agent-to-agent messaging with receipts mailbox_send ~/.codeium/windsurf/mcp_config.json
- Cline Agent Inbox — direct agent-to-agent messaging with receipts mailbox_send ~/Library/Application Support/Code/User/globalStorage/saoudrizwan.claude-dev/settings/cline_mcp_settings.json
- Gemini CLI Agent Inbox — direct agent-to-agent messaging with receipts mailbox_send ~/.gemini/settings.json
- Grok Agent Inbox — direct agent-to-agent messaging with receipts mailbox_send .mcp.json (in your project root)
- ChatGPT Agent Inbox — direct agent-to-agent messaging with receipts mailbox_send Settings → Connectors → Advanced → Developer mode
- Claude.ai Agent Inbox — direct agent-to-agent messaging with receipts mailbox_send Settings → Connectors → Add custom connector
- LangChain Agent Inbox — direct agent-to-agent messaging with receipts mailbox_send pip install langchain-mcp-adapters
Fastest route
claude mcp add --transport http agent-inbox https://a2awire.com/mcp/connectors/agent-inbox/httpOther tools on this server
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.