diff --git a/scripts/compile.py b/scripts/compile.py
index a0787e9..5ba9b3c 100644
--- a/scripts/compile.py
+++ b/scripts/compile.py
@@ -13,9 +13,17 @@ Usage:
 
 from __future__ import annotations
 
+import os
+
+# Recursion guard — must be set BEFORE claude_agent_sdk imports anything that
+# spawns a Claude subprocess. Inner SessionEnd / PreCompact hooks check
+# CLAUDE_INVOKED_BY at startup and exit if set, preventing the global hooks
+# from triggering flush.py against this process's daily log (which would
+# pollute the log with compile metadata and could create a recursion loop).
+os.environ["CLAUDE_INVOKED_BY"] = "memoria_compile"
+
 import argparse
 import asyncio
-import os
 import re
 import sys
 from pathlib import Path
diff --git a/scripts/lint.py b/scripts/lint.py
index 9b6e609..bfc2dc3 100644
--- a/scripts/lint.py
+++ b/scripts/lint.py
@@ -11,9 +11,15 @@ Usage:
 
 from __future__ import annotations
 
+import os
+
+# Recursion guard — set before any SDK import so global SessionEnd/PreCompact
+# hooks see CLAUDE_INVOKED_BY in the nested Claude subprocess's env and exit
+# cleanly. See compile.py for full rationale.
+os.environ["CLAUDE_INVOKED_BY"] = "memoria_lint"
+
 import argparse
 import asyncio
-import os
 from pathlib import Path
 
 from config import KNOWLEDGE_DIR, REPORTS_DIR, now_iso, today_iso
diff --git a/scripts/query.py b/scripts/query.py
index 9e87b54..e8c83ae 100644
--- a/scripts/query.py
+++ b/scripts/query.py
@@ -12,9 +12,15 @@ Usage:
 
 from __future__ import annotations
 
+import os
+
+# Recursion guard — see compile.py for rationale. Set before any SDK import
+# so the global SessionEnd/PreCompact hooks see CLAUDE_INVOKED_BY in the
+# nested Claude subprocess's env and exit cleanly.
+os.environ["CLAUDE_INVOKED_BY"] = "memoria_query"
+
 import argparse
 import asyncio
-import os
 from pathlib import Path
 
 from config import KNOWLEDGE_DIR, QA_DIR, now_iso