Initial release: aircontext

scripts/on_pre_compact.py

@@ -0,0 +1,42 @@
+#!/usr/bin/env python3
+"""PreCompact hook — block Claude Code's built-in auto-compact.
+
+Only active in projects that have opted in (AirContext/ exists). Otherwise
+Claude's default auto-compact behaviour is preserved untouched.
+
+Manual `/compact` is always allowed; auto-triggered compaction is rejected so
+AirContext's rule-driven compactor is the only thing that mutates the chain.
+"""
+from __future__ import annotations
+import json
+import os
+import sys
+from pathlib import Path
+
+
+def main() -> int:
+    raw = sys.stdin.read() or "{}"
+    try:
+        payload = json.loads(raw)
+    except json.JSONDecodeError:
+        payload = {}
+
+    cwd = payload.get("cwd") or os.environ.get("CLAUDE_PROJECT_DIR") or os.getcwd()
+    if not (Path(cwd) / "AirContext").exists():
+        return 0  # project hasn't opted in; let Claude do whatever it wants
+
+    trigger = payload.get("trigger") or payload.get("compact_trigger")
+    if trigger == "auto":
+        print(json.dumps({
+            "decision": "block",
+            "reason": (
+                "AirContext: auto-compact disabled by user policy. "
+                "Custom rule-driven compaction handles this out-of-band."
+            )
+        }))
+        return 0
+    return 0  # manual /compact passes through
+
+
+if __name__ == "__main__":
+    sys.exit(main())