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# Add Tool to MCP Server
Adds a new tool to your MCP server with proper schema validation and error handling.
## Usage
```
/add-tool <name> <description> [parameters]
```
## Examples
```
/add-tool calculate "Performs mathematical calculations"
/add-tool search "Search for information" query:string limit:number?
/add-tool process_data "Process data with options" input:string format:enum[json,csv,xml]
```
## Implementation
```typescript
import { z } from 'zod';
import * as fs from 'fs/promises';
import * as path from 'path';
async function addTool(name: string, description: string, parameters?: string[]) {
// Parse parameters into schema
const schema = parseParameterSchema(parameters || []);
// Generate tool file
const toolContent = generateToolFile(name, description, schema);
// Write tool file
const toolPath = path.join('src/tools', `${name}.ts`);
await fs.writeFile(toolPath, toolContent);
// Update tool index
await updateToolIndex(name);
// Generate test file
const testContent = generateToolTest(name);
const testPath = path.join('tests/unit/tools', `${name}.test.ts`);
await fs.writeFile(testPath, testContent);
console.log(`✅ Tool "${name}" added successfully!`);
console.log(` - Implementation: ${toolPath}`);
console.log(` - Test file: ${testPath}`);
console.log(`\nNext steps:`);
console.log(` 1. Implement the tool logic in ${toolPath}`);
console.log(` 2. Run tests with "npm test"`);
console.log(` 3. Test with MCP Inspector`);
}
function parseParameterSchema(parameters: string[]): any {
const properties: Record<string, any> = {};
const required: string[] = [];
for (const param of parameters) {
const [nameType, ...rest] = param.split(':');
const isOptional = nameType.endsWith('?');
const name = isOptional ? nameType.slice(0, -1) : nameType;
const type = rest.join(':') || 'string';
if (!isOptional) {
required.push(name);
}
properties[name] = parseType(type);
}
return {
type: 'object',
properties,
required: required.length > 0 ? required : undefined,
};
}
function parseType(type: string): any {
if (type.startsWith('enum[')) {
const values = type.slice(5, -1).split(',');
return {
type: 'string',
enum: values,
};
}
switch (type) {
case 'number':
return { type: 'number' };
case 'boolean':
return { type: 'boolean' };
case 'array':
return { type: 'array', items: { type: 'string' } };
default:
return { type: 'string' };
}
}
function generateToolFile(name: string, description: string, schema: any): string {
return `
import { z } from 'zod';
import type { ToolHandler } from '../types/tools.js';
// Define Zod schema for validation
const ${capitalize(name)}Schema = z.object({
${generateZodSchema(schema.properties, ' ')}
});
export type ${capitalize(name)}Args = z.infer<typeof ${capitalize(name)}Schema>;
export const ${name}Tool = {
name: '${name}',
description: '${description}',
inputSchema: ${JSON.stringify(schema, null, 2)},
handler: async (args: unknown): Promise<ToolHandler> => {
// Validate input
const validated = ${capitalize(name)}Schema.parse(args);
// TODO: Implement your tool logic here
const result = await process${capitalize(name)}(validated);
return {
content: [
{
type: 'text',
text: JSON.stringify(result),
},
],
};
},
};
async function process${capitalize(name)}(args: ${capitalize(name)}Args) {
// TODO: Implement the actual processing logic
return {
success: true,
message: 'Tool executed successfully',
input: args,
};
}
`;
}
function generateZodSchema(properties: Record<string, any>, indent: string): string {
const lines: string[] = [];
for (const [key, value] of Object.entries(properties)) {
let zodType = 'z.string()';
if (value.type === 'number') {
zodType = 'z.number()';
} else if (value.type === 'boolean') {
zodType = 'z.boolean()';
} else if (value.enum) {
zodType = `z.enum([${value.enum.map((v: string) => `'${v}'`).join(', ')}])`;
} else if (value.type === 'array') {
zodType = 'z.array(z.string())';
}
lines.push(`${indent}${key}: ${zodType},`);
}
return lines.join('\n');
}
function capitalize(str: string): string {
return str.charAt(0).toUpperCase() + str.slice(1);
}
function generateToolTest(name: string): string {
return `
import { describe, it, expect, vi } from 'vitest';
import { ${name}Tool } from '../../src/tools/${name}.js';
describe('${name} tool', () => {
it('should have correct metadata', () => {
expect(${name}Tool.name).toBe('${name}');
expect(${name}Tool.description).toBeDefined();
expect(${name}Tool.inputSchema).toBeDefined();
});
it('should validate input parameters', async () => {
const invalidInput = {};
await expect(${name}Tool.handler(invalidInput))
.rejects
.toThrow();
});
it('should handle valid input', async () => {
const validInput = {
// TODO: Add valid test input
};
const result = await ${name}Tool.handler(validInput);
expect(result).toHaveProperty('content');
expect(result.content[0]).toHaveProperty('type', 'text');
});
it('should handle errors gracefully', async () => {
// TODO: Add error handling tests
});
});
`;
}
```
|
