diff --git a/extensions/index.ts b/extensions/index.ts
index c80115f..baf377a 100644
--- a/extensions/index.ts
+++ b/extensions/index.ts
@@ -15,7 +15,7 @@ import { registerQmemTree } from "./tools/tree";
 import { registerQmemRules } from "./rules";
 import { registerQmemLocal } from "./local-command";
 import { flushQueueIfPending, localDbPath } from "./local-db.ts";
-import { loadConfig } from "./shared.ts";
+import { localIsoTimestamp, loadConfig } from "./shared.ts";
 
 export default function qmemExtension(pi: ExtensionAPI) {
 	registerQmemStore(pi);
@@ -28,6 +28,25 @@ export default function qmemExtension(pi: ExtensionAPI) {
 	registerQmemLocal(pi);
 	registerQmemRules(pi);
 
+	// Aggiunge un timestamp locale a ogni risultato finale dei tool qmem.
+	pi.on("tool_result", (event) => {
+		if (!event.toolName.startsWith("qmem_")) return;
+
+		const timestamp = localIsoTimestamp();
+		const previousDetails = event.details;
+		const details =
+			previousDetails && typeof previousDetails === "object" && !Array.isArray(previousDetails)
+				? (previousDetails as Record<string, unknown>)
+				: previousDetails === undefined || previousDetails === null
+					? {}
+					: { qmem_previous_details: previousDetails };
+
+		return {
+			content: [...event.content, { type: "text" as const, text: `Ora output qmem: ${timestamp}` }],
+			details: { ...details, qmem_output_timestamp: timestamp },
+		};
+	});
+
 	// Outbox: al ritorno della connessione (nuova sessione/reload) i record
 	// accodati offline vengono inviati al gateway. In background: l'avvio della
 	// sessione non deve mai attendere la rete.
diff --git a/extensions/rules.ts b/extensions/rules.ts
index 98da10c..8ca96a3 100644
--- a/extensions/rules.ts
+++ b/extensions/rules.ts
@@ -1,7 +1,12 @@
 import type { ExtensionAPI } from "@earendil-works/pi-coding-agent";
-import { MACHINE } from "./shared";
+import { localIsoTimestamp, MACHINE } from "./shared";
 
 export function registerQmemRules(pi: ExtensionAPI) {
+	let sessionStartedAt = localIsoTimestamp();
+	pi.on("session_start", () => {
+		sessionStartedAt = localIsoTimestamp();
+	});
+
 	const QMEM_RULES = `### pi-qmem rules (binding)
 MUST:
 - Run qmem_search before starting a task and before retrying after an error/block.
@@ -33,8 +38,14 @@ Before any substantive answer or state-changing action, in order:
 
 	pi.on("before_agent_start", async (event) => {
 		const tools = event.systemPromptOptions?.selectedTools ?? [];
-		const hasQmem = ["qmem_store", "qmem_search", "qmem_get", "qmem_correct", "qmem_meta"].some((t) => tools.includes(t));
+		const hasQmem = ["qmem_store", "qmem_search", "qmem_get", "qmem_correct", "qmem_meta", "qmem_tree"].some((t) => tools.includes(t));
 		if (!hasQmem) return {};
-		return { systemPrompt: event.systemPrompt + QMEM_RULES };
+		const runtimeContext = `
+### Contesto runtime sessione
+- Host di questa sessione: ${MACHINE}.
+- Sessione avviata: ${sessionStartedAt} (ISO 8601, fuso locale).
+- Ora locale attuale: ${localIsoTimestamp()}.
+- Usa questi valori runtime come contesto; non stimare né inventare host o date/ore.`;
+		return { systemPrompt: event.systemPrompt + runtimeContext + "\n" + QMEM_RULES };
 	});
 }
diff --git a/extensions/shared.ts b/extensions/shared.ts
index 639d071..7a4cd15 100644
--- a/extensions/shared.ts
+++ b/extensions/shared.ts
@@ -207,6 +207,16 @@ export function detectMachine(): string {
 
 export const MACHINE = detectMachine();
 
+/** Timestamp ISO 8601 con offset del fuso locale della macchina. */
+export function localIsoTimestamp(date = new Date()): string {
+	const offsetMinutes = -date.getTimezoneOffset();
+	const sign = offsetMinutes >= 0 ? "+" : "-";
+	const absOffset = Math.abs(offsetMinutes);
+	const offset = `${sign}${String(Math.floor(absOffset / 60)).padStart(2, "0")}:${String(absOffset % 60).padStart(2, "0")}`;
+	const localTime = new Date(date.getTime() + offsetMinutes * 60_000).toISOString().slice(0, -1);
+	return `${localTime}${offset}`;
+}
+
 export async function gatewayRequest(
 	cfg: MemoryConfig,
 	method: string,