Apple Calendar + OpenCode: Complete MCP Integration

Apple Calendar is a MCP server that An MCP server that allows you to interact with your macOS Calendar through natural language, including features such as event creation, modification, schedule listing, finding free time slots etc..

When integrated with OpenCode, you can:

• Access Apple Calendar functionality through OpenCode

This guide provides step-by-step instructions to set up Apple Calendar in OpenCode, including configuration, examples, and troubleshooting.

What You'll Achieve

After completing this setup:

• Apple Calendar will be fully integrated and operational
• You can use Apple Calendar tools directly in OpenCode
• All Apple Calendar capabilities will be available for your workflows

Prerequisites

Before starting, ensure you have:

• OpenCode installed and configured
• Compatible operating system (macOS, Linux, Windows)

Installation

Step 1: Install Apple Calendar

Configuration

Step 2: Configure OpenCode

1. Locate your configuration file:

2. Add server configuration:

Configure MCP servers in your `opencode.json` or `opencode.jsonc`:

```json
{
  "mcp": {
    "my-mcp": {
      "type": "local",
      "command": ["npx", "-y", "@modelcontextprotocol/server-everything"],
      "environment": {
        "API_KEY": "$API_KEY"
      },
      "timeout": 5000
    },
    "remote-server": {
      "type": "remote",
      "url": "https://mcp.example.com/sse",
      "headers": {
        "Authorization": "Bearer $API_TOKEN"
      }
    }
  }
}

Disable a server temporarily:

{
  "mcp": {
    "my-mcp": {
      "type": "local",
      "command": ["npx", "-y", "mcp-server"],
      "enabled": false
    }
  }
}

3. **Restart OpenCode**

Completely quit and restart OpenCode to load the new configuration.



## Examples

Once configured, you can use Apple Calendar in OpenCode:



## Testing Your Setup

1. Run opencode in terminal
2. Add "use the mcp_name tool" to your prompts
3. Verify tool execution and response



## Troubleshooting

### Common Issues

#### MCP Server Not Loading

**Symptoms:** Server not appearing in tools, Timeout errors, Command not found

**Cause:** Invalid configuration, missing dependencies, or timeout too short

**Solution:**
- Verify command array is correct in opencode.json
- Check environment variables are set properly
- Increase timeout value if server takes longer to start
- Test MCP server command independently in terminal

#### Context Limit Exceeded

**Symptoms:** Context too large errors, Slow responses, Truncated output

**Cause:** Too many MCP servers adding to context

**Solution:**
- Disable unused MCP servers with enabled: false
- Use per-agent tool configuration to limit active MCPs
- Avoid MCP servers that add many tokens (e.g., GitHub MCP)

#### Remote Server Connection Failed

**Symptoms:** Cannot connect to remote MCP, Authentication errors

**Cause:** Invalid URL, missing headers, or network issues

**Solution:**
- Verify remote server URL is correct
- Check authorization headers are properly configured
- Ensure environment variables for tokens are set

#### Apple Calendar not appearing in OpenCode

**Symptoms:** Server not listed, Tools not available

**Cause:** Configuration or installation issue

**Solution:**
- Verify configuration syntax
- Check Apple Calendar installation
- Restart OpenCode
- Check logs for error messages



## Next Steps

Now that Apple Calendar is integrated with OpenCode:

- Explore all Apple Calendar capabilities through OpenCode
- Check out other MCP servers that work with OpenCode
- Join the MCP community for tips and support
- Consider contributing to Apple Calendar development

## Need Help?

- Search for [Apple Calendar documentation](https://www.mcpstack.org)
- Check the [OpenCode MCP guide](https://www.mcpstack.org/clients)
- Join the MCP community discussions