import { z } from 'zod';
/**
* Creates a Zod schema for boolean values that handles MCP's string-based parameter passing.
* MCP protocol passes all parameters as strings, so we need to preprocess them into booleans.
*
* @param defaultValue Optional default value for the boolean parameter
* @returns A Zod schema that coerces string values to booleans
*
* @example
* ```typescript
* const schema = z.object({
* enabled: coercedBoolean(true).describe('Enable feature'),
* confirmAction: coercedBoolean().describe('Confirm action'),
* });
* ```
*/
export const coercedBoolean = (defaultValue?: boolean) =>
z.preprocess(
(val) => {
if (typeof val === 'string') {
const normalized = val.toLowerCase();
return normalized === 'true' || normalized === '1';
}
return val;
},
defaultValue !== undefined
? z.boolean().optional().default(defaultValue)
: z.boolean().optional()
);
