add-prompt

Context

Prompts use the prompt() builder from @cyanheads/mcp-ts-core. Each prompt lives in src/mcp-server/prompts/definitions/ with a .prompt.ts suffix. The standard registration pattern uses a definitions/index.ts barrel that collects all prompts into an allPromptDefinitions array for createApp(). Fresh scaffolds start with direct imports in src/index.ts — the barrel is introduced as definitions grow. Match the pattern already used by the project you're editing.

Prompts are pure message templates — no Context, no auth, no side effects. generate can be sync or async (returns PromptMessage[] | Promise<PromptMessage[]>).

Steps

1. Gather the prompt's name, purpose, and arguments from the user's request — ask only if genuinely absent
2. Create the file at src/mcp-server/prompts/definitions/{{prompt-name}}.prompt.ts
3. Register the prompt in the project's existing createApp() prompt list (directly in src/index.ts for fresh scaffolds, or via a barrel if the repo already has one)
4. Run bun run devcheck to verify

Template

/**
 * @fileoverview {{PROMPT_DESCRIPTION}}
 * @module mcp-server/prompts/definitions/{{PROMPT_NAME}}
 */

import { completable, prompt, z } from '@cyanheads/mcp-ts-core';

export const {{PROMPT_EXPORT}} = prompt('{{prompt_name}}', {
  description: '{{PROMPT_DESCRIPTION}}',
  // title is optional — human-readable display name surfaced in prompts/list.
  // title: '{{PROMPT_DISPLAY_TITLE}}',
  // args is optional — omit entirely for prompts with no parameters.
  // When present, all fields need .describe(). Only JSON-Schema-serializable types allowed.
  // Wrap any field with completable() to enable argument autocompletion.
  args: z.object({
    // All fields need .describe()
    // language: completable(z.string().describe('Language'), async (partial) => matchingLanguages(partial)),
  }),
  generate: (args) => [
    {
      role: 'user',
      content: {
        type: 'text',
        text: `{{PROMPT_TEMPLATE_TEXT}}`,
      },
    },
  ],
});