feat: improved the Claude Kit as a plugin

scripts/auto-format.cjs

@@ -0,0 +1,43 @@
+#!/usr/bin/env node
+/**
+ * PostToolUse hook: auto-formats files after Write or Edit.
+ * Detects file extension and runs the appropriate formatter.
+ * Fails open — formatting errors are silently ignored.
+ */
+"use strict";
+
+const { execFileSync } = require("child_process");
+const path = require("path");
+
+const FORMATTERS = {
+  ".py": (f) => ({ cmd: "ruff", args: ["check", "--fix", f] }),
+  ".ts": (f) => ({ cmd: "npx", args: ["eslint", "--fix", f] }),
+  ".tsx": (f) => ({ cmd: "npx", args: ["eslint", "--fix", f] }),
+  ".js": (f) => ({ cmd: "npx", args: ["eslint", "--fix", f] }),
+  ".jsx": (f) => ({ cmd: "npx", args: ["eslint", "--fix", f] }),
+};
+
+async function main() {
+  try {
+    let data = "";
+    for await (const chunk of process.stdin) data += chunk;
+    const input = JSON.parse(data);
+
+    const filePath = input?.tool_input?.file_path ?? "";
+    if (!filePath) return;
+
+    const ext = path.extname(filePath).toLowerCase();
+    const formatter = FORMATTERS[ext];
+    if (!formatter) return;
+
+    const { cmd, args } = formatter(filePath);
+    execFileSync(cmd, args, {
+      stdio: "ignore",
+      timeout: 10000,
+    });
+  } catch {
+    // Fail open — formatting errors should never block work
+  }
+}
+
+main();