diff --git a/.jules/sentinel.md b/.jules/sentinel.md
new file mode 100644
index 0000000..b732a04
--- /dev/null
+++ b/.jules/sentinel.md
@@ -0,0 +1,4 @@
+## 2024-10-26 - Command Injection via `execSync` Path Formatting
+**Vulnerability:** Command injection vulnerability identified in `packages/core/src/reconcile.ts` where a shell string was constructed using `execSync(\`node --check "\${tempFile}"\`, { stdio: "pipe" });`. Since `tempFile` derives from `options.workspace`, any shell metacharacters (e.g. `"; <cmd> ;"`) within the path could lead to arbitrary command execution by the Node.js shell.
+**Learning:** `execSync` passes the entire command string to the system shell. When constructing commands that include dynamic or file paths, passing it as a string allows shell injection if the dynamic parts contain unescaped shell operators.
+**Prevention:** Avoid `execSync` with template strings containing dynamic paths. Instead, use `execFileSync` (or `spawnSync`) which executes the binary directly without passing the command through a shell. The arguments are passed as an array to `execFileSync`, naturally preventing any shell injections: `execFileSync(process.execPath, ["--check", tempFile], { stdio: "pipe" });`.
diff --git a/packages/core/src/reconcile.ts b/packages/core/src/reconcile.ts
index b0285bc..7b04b7f 100644
--- a/packages/core/src/reconcile.ts
+++ b/packages/core/src/reconcile.ts
@@ -1,4 +1,4 @@
-import { execSync } from "node:child_process";
+import { execFileSync } from "node:child_process";
 import crypto from "node:crypto";
 import fs from "node:fs";
 import path from "node:path";
@@ -139,7 +139,7 @@ export function reconcile(options: ReconcileOptions): ReconcileResult {
   fs.writeFileSync(tempFile, extractedCode, "utf8");
 
   try {
-    execSync(`node --check "${tempFile}"`, { stdio: "pipe" });
+    execFileSync(process.execPath, ["--check", tempFile], { stdio: "pipe" });
     log.audit("Syntax check passed");
   } catch (err) {
     const stderr =