Function completable

Example

server.registerPrompt(
    'review-code',
    {
        title: 'Code Review',
        argsSchema: z.object({
            language: completable(z.string().describe('Programming language'), value =>
                ['typescript', 'javascript', 'python', 'rust', 'go'].filter(lang => lang.startsWith(value))
            )
        })
    },
    ({ language }) => ({
        messages: [
            {
                role: 'user' as const,
                content: {
                    type: 'text' as const,
                    text: `Review this ${language} code.`
                }
            }
        ]
    })
);
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