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1. Go to Settings -> Skills -> Add Custom MCP Skill.

2. Enter the MCP server settings:
MCP type: Streamable HTTP
MCP name: spreadjs-mcp.
Streamable HTTP Endpoint URL: https://developer.mescius.com/mcp/spreadjs.
Auth type: API Key
API Key: <YOUR_MCP_TOKEN>
3. Click Test connection. After the connection succeeds, the right panel should show the MCP server information and available tools.

4. Click Install to save the configuration. spreadjs-mcp should appear in the Skills list.

Reference: How to set MCP in LobeHub