Code-MCP

Instructions

Input Schema

Input Schema (JSON Schema)

Implementation Reference

• src/tools/validator.ts:19-69 (handler)

  The core handler function that executes the validate_code tool logic: writes code to temp file, runs Prettier check for JS/TS/etc., Python py_compile for Python, or warns for unsupported languages.
  export async function validateCodeHandler(args: any) { const { code, language } = args; // Create a temporary file to run validation against const tmpDir = os.tmpdir(); const fileName = `validate_${Date.now()}.${getExt(language)}`; const filePath = path.join(tmpDir, fileName); try { await fs.writeFile(filePath, code); // Default to Prettier for supported languages if (["javascript", "typescript", "json", "css", "html", "markdown", "yaml"].includes(language)) { try { // Check syntax and formatting await execAsync(`npx prettier --check "${filePath}"`); // If checking passed, it's valid code (mostly) return { content: [{ type: "text", text: "✅ Code is valid and formatted correctly." }] }; } catch (error: any) { // Prettier error output usually contains the syntax error details return { content: [{ type: "text", text: `❌ Validation Failed:\n${error.stdout || error.stderr || error.message}` }] }; } } // Fallback for other languages (mock validation for now, or add specific compilers like `python -m py_compile`) if (language === "python") { try { await execAsync(`python -m py_compile "${filePath}"`); return { content: [{ type: "text", text: "✅ Python syntax is valid." }] }; } catch (error: any) { return { content: [{ type: "text", text: `❌ Python Syntax Error:\n${error.stderr}` }] }; } } return { content: [{ type: "text", text: `⚠️ No specific validator configured for ${language}, but code was received.` }] }; } catch (err: any) { return { content: [{ type: "text", text: `System Error during validation: ${err.message}` }] }; } finally { // Cleanup try { await fs.unlink(filePath); } catch { } } }
• src/tools/validator.ts:10-17 (schema)

  Zod schema definition for the validate_code tool, specifying input parameters: code (string) and language (string).
  export const validateCodeSchema = { name: "validate_code", description: "Validates code syntax and formatting using available linters (e.g., Prettier). usage: providing code snippets to check for correctness before finalizing.", inputSchema: z.object({ code: z.string().describe("The code content to validate."), language: z.string().describe("The programming language (e.g., 'typescript', 'python', 'json')."), }) };
• src/index.ts:94-94 (registration)

  Registration of the validate_code tool in the main toolRegistry Map used by the stdio MCP server.
  ["validate_code", { schema: validateCodeSchema, handler: validateCodeHandler }],
• src/server.ts:102-102 (registration)

  Registration of the validate_code tool in the toolRegistry Map used by the HTTP MCP server.
  ["validate_code", { schema: validateCodeSchema, handler: validateCodeHandler }],
• src/tools/validator.ts:71-77 (helper)

  Helper function to determine file extension based on programming language, used for creating temporary files for validation.
  function getExt(lang: string): string { const map: Record<string, string> = { typescript: "ts", javascript: "js", python: "py", rust: "rs", go: "go", html: "html", css: "css", json: "json" }; return map[lang] || "txt"; }