Code-MCP

import { z } from "zod"; import { exec } from "child_process"; import { promisify } from "util"; import fs from "fs/promises"; const execAsync = promisify(exec); // --- Tools --- export const runTestsSafeSchema = { name: "run_tests_safe", description: "Run project tests safely. Only allows standard test commands.", inputSchema: z.object({ command: z .enum([ "npm test", "yarn test", "pnpm test", "go test", "cargo test", "pytest", ]) .describe("Test command to run"), args: z .string() .optional() .describe("Additional arguments (e.g., specific file)"), }), }; export const analyzeCoverageSchema = { name: "analyze_average", description: "Analyze test coverage reports (lcov).", inputSchema: z.object({ reportPath: z.string().describe("Path to lcov.info or coverage file"), }), }; // --- Handlers --- export async function runTestsSafeHandler(args: { command: string; args?: string; }) { try { // Strict command allowlist is enforced by Zod enumSchema const fullCommand = args.args ? `${args.command} ${args.args}` : args.command; const { stdout, stderr } = await execAsync(fullCommand, { timeout: 30000 }); // 30s timeout return { content: [ { type: "text", text: `STDOUT:\n${stdout}\n\nSTDERR:\n${stderr}`, }, ], }; } catch (error: any) { return { content: [ { type: "text", text: `Test Execution Failed:\n${error.message}\nSTDOUT:\n${error.stdout}\nSTDERR:\n${error.stderr}`, }, ], isError: true, }; } } export async function analyzeCoverageHandler(args: { reportPath: string }) { try { const content = await fs.readFile(args.reportPath, "utf-8"); // Very basic lcov parsing const records = content.split("end_of_record"); let totalLines = 0; let coveredLines = 0; for (const record of records) { const lfMatch = record.match(/LF:(\d+)/); // Lines Found const lhMatch = record.match(/LH:(\d+)/); // Lines Hit if (lfMatch && lhMatch) { totalLines += parseInt(lfMatch[1]); coveredLines += parseInt(lhMatch[1]); } } const percentage = totalLines > 0 ? (coveredLines / totalLines) * 100 : 0; return { content: [ { type: "text", text: JSON.stringify( { reportFile: args.reportPath, totalLines, coveredLines, coveragePercent: percentage.toFixed(2) + "%", }, null, 2, ), }, ], }; } catch (error) { return { content: [ { type: "text", text: `Error reading coverage report: ${error instanceof Error ? error.message : String(error)}`, }, ], isError: true, }; } }