diff --git a/apps/cli/src/application/lib/run-id-gen.ts b/apps/cli/src/application/lib/run-id-gen.ts
new file mode 100644
index 00000000..4bccf259
--- /dev/null
+++ b/apps/cli/src/application/lib/run-id-gen.ts
@@ -0,0 +1,32 @@
+class RunIdGenerator {
+    private lastMs = 0;
+    private seq = 0;
+    private readonly pid: string;
+    private readonly hostTag: string;
+
+    constructor(hostTag: string = "") {
+        this.pid = String(process.pid).padStart(7, "0");
+        this.hostTag = hostTag ? `-${hostTag}` : "";
+    }
+
+    /**
+     * Returns an ISO8601-based, lexicographically sortable id string.
+     * Example: 2025-11-11T04-36-29Z-0001234-h1-000
+     */
+    next(): string {
+        const now = Date.now();
+        const ms = now >= this.lastMs ? now : this.lastMs; // monotonic clamp
+        this.seq = ms === this.lastMs ? this.seq + 1 : 0;
+        this.lastMs = ms;
+
+        // Build ISO string (UTC) and remove milliseconds for cleaner filenames
+        const iso = new Date(ms).toISOString() // e.g. 2025-11-11T04:36:29.123Z
+            .replace(/\.\d{3}Z$/, "Z")           // drop .123 part
+            .replace(/:/g, "-");                 // safe for files: 2025-11-11T04-36-29Z
+
+        const seqStr = String(this.seq).padStart(3, "0");
+        return `${iso}-${this.pid}${this.hostTag}-${seqStr}`;
+    }
+}
+
+export const runIdGenerator = new RunIdGenerator();
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