This page connects live Sendmux MCP tools. To install the Sendmux skills or
plugin marketplace first, use Agent skills.
Choose a setup
Hosted OAuth
Use this for Claude, Cursor, Codex, Gemini CLI, Qwen Code, Kiro, OpenCode, Zed, Visual Studio, Hoot, and ChatGPT.
Local stdio
Use this when your client can launch
sendmux-mcp on your machine.Private HTTP
Use this when your client needs a URL or runs outside your laptop.
Compatibility matrix
Compatibility matrix
A client can still use Sendmux when hosted OAuth is not listed. Use local
stdio if the client can launch commands, or private HTTP if it needs a URL.
Hosted OAuth clients (Recommended)
Use the hosted endpoint when the client supports remote MCP OAuth:Local stdio clients
Install the local package once:Private HTTP clients
Start a local HTTP MCP server:http://127.0.0.1:8765/mcp as the client URL.
Verify the connection
1
Reconnect the server
Restart or reconnect the MCP server in the client.
2
Check the tools
Open the client’s MCP server list or tool picker and confirm Sendmux tools appear.
3
Select a mailbox when needed
For a hosted multi-mailbox grant, call
mailbox_list_granted_mailboxes before mailbox-specific work.4
Check private HTTP auth
For private HTTP, confirm the client sends
Authorization: Bearer local-mcp-token.Next steps
MCP overview
Compare Doc Search MCP, hosted MCP, local stdio, and private HTTP.
API keys
Create mailbox and root keys for local MCP.
Agent skills
Teach AI coding agents the Sendmux workflows and efficient defaults.
CLI
Run Sendmux workflows from your terminal.