Project Memory MCP

import { promises as fs } from 'fs'; import { join } from 'path'; /** * Maximum lines allowed per prompt file to prevent context bloat */ export const MAX_PROMPT_LINES = 200; /** * Validates that a prompt file does not exceed the line limit */ export function validatePromptLength(content: string, filename: string): void { const lines = content.split('\n'); if (lines.length > MAX_PROMPT_LINES) { console.warn( `Warning: ${filename} has ${lines.length} lines, exceeding the ${MAX_PROMPT_LINES} line limit. ` + `Consider splitting this prompt to prevent context bloat.` ); } } /** * Reads a prompt file from .project-memory/prompts/ * Returns null if file doesn't exist */ export async function readPromptFile( projectRoot: string, filename: string ): Promise<string | null> { const promptPath = join(projectRoot, '.project-memory', 'prompts', filename); try { const content = await fs.readFile(promptPath, 'utf-8'); validatePromptLength(content, filename); return content; } catch (error) { if ((error as NodeJS.ErrnoException).code === 'ENOENT') { return null; } throw error; } } /** * Composes a prompt by combining base + specific prompt * Returns the hardcoded fallback if project-specific prompts don't exist */ export async function composePrompt( projectRoot: string, specificPrompt: string, fallbackPrompt: string ): Promise<string> { const base = await readPromptFile(projectRoot, 'base.md'); const specific = await readPromptFile(projectRoot, specificPrompt); // If project-specific prompts don't exist, return fallback if (!base && !specific) { return fallbackPrompt; } // Compose available prompts const parts: string[] = []; if (base) { parts.push('# Base Instructions\n\n' + base); } if (specific) { parts.push('\n\n# Specific Instructions\n\n' + specific); } return parts.join(''); } /** * Gets the project root directory (current working directory) */ export function getProjectRoot(): string { return process.cwd(); }