Derive Macro McpBackend

#[derive(McpBackend)]
{
    // Attributes available to this derive:
    #[mcp_backend]
}

Derive macro for McpBackend

This macro generates implementations for:

• Custom error type with automatic conversions
• Backend trait delegation to reduce boilerplate
• Automatic error mapping and handling
• Integration with the MCP server framework

Attributes

Type-level attributes:

• #[mcp_backend(error = "CustomError")] - Use custom error type
• #[mcp_backend(config = "CustomConfig")] - Use custom config type
• #[mcp_backend(simple)] - Implement SimpleBackend instead of full McpBackend

Field-level attributes:

• #[mcp_backend(delegate)] - Delegate method calls to this field
• #[mcp_backend(error_from)] - Generate error conversion from this type

Example

#[derive(McpBackend)]
#[mcp_backend(error = "MyBackendError", config = "MyConfig")]
struct MyBackend {
    #[mcp_backend(delegate)]
    inner: SomeInnerBackend,
    config: MyConfig,
}