> ## Documentation Index
> Fetch the complete documentation index at: https://sendmux.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# OpenCode MCP setup

> Configure Sendmux MCP in OpenCode.

Use this page to connect Sendmux MCP to your AI client.

## Hosted OAuth

Use the hosted endpoint when the client supports remote MCP OAuth:

```text theme={null}
https://mcp.sendmux.ai/mcp
```

Add this to `opencode.json`.

```json theme={null}
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "sendmux": {
      "type": "remote",
      "url": "https://mcp.sendmux.ai/mcp",
      "enabled": true
    }
  }
}
```

Authenticate when prompted, or run:

```bash theme={null}
opencode mcp auth sendmux
```

## Local stdio

Install the local package once:

```bash theme={null}
pip install sendmux-mcp
```

Use a mailbox key for Mailbox or Sending:

```bash theme={null}
export SENDMUX_MBX_KEY=smx_mbx_...
```

Use a root key for Management:

```bash theme={null}
export SENDMUX_ROOT_KEY=smx_root_...
```

Add this to `opencode.json`.

```json theme={null}
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "sendmux-mailbox": {
      "type": "local",
      "command": ["sendmux-mcp-mailbox"],
      "environment": {
        "SENDMUX_API_KEY": "smx_mbx_..."
      },
      "enabled": true
    }
  }
}
```

## Private HTTP

Start a local HTTP MCP server:

```bash theme={null}
SENDMUX_API_KEY=smx_mbx_... \
SENDMUX_MCP_HTTP_BEARER_TOKEN=local-mcp-token \
sendmux-mcp-mailbox --transport http --host 127.0.0.1 --port 8765
```

Use `http://127.0.0.1:8765/mcp` as the client URL.

```json theme={null}
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "sendmux-local": {
      "type": "remote",
      "url": "http://127.0.0.1:8765/mcp",
      "oauth": false,
      "headers": {
        "Authorization": "Bearer local-mcp-token"
      },
      "enabled": true
    }
  }
}
```