import { z } from 'zod';
import { McpError, ErrorCode } from '@modelcontextprotocol/sdk/types.js';
/**
* Validates arguments against a Zod schema and converts validation errors to MCP errors.
*
* @param args - The arguments to validate (from MCP tool request)
* @param schema - The Zod schema to validate against
* @returns The validated and typed arguments
* @throws McpError with InvalidParams error code if validation fails
*
* @example
* ```typescript
* const args = validateArgs(request.params.arguments, searchPhotosSchema);
* // args is now type-safe with SearchPhotosArgs type
* ```
*/
export function validateArgs<T>(
args: unknown,
schema: z.ZodSchema<T>
): T {
try {
return schema.parse(args);
} catch (error) {
if (error instanceof z.ZodError) {
const issues = error.errors
.map(e => `${e.path.join('.')}: ${e.message}`)
.join(', ');
throw new McpError(
ErrorCode.InvalidParams,
`Invalid parameters: ${issues}`
);
}
throw new McpError(ErrorCode.InvalidParams, 'Invalid parameters');
}
}
