diff --git a/gateway/slash_commands_session.py b/gateway/slash_commands_session.py
index 664e9af231..ffaa94412a 100644
--- a/gateway/slash_commands_session.py
+++ b/gateway/slash_commands_session.py
@@ -483,7 +483,8 @@ class GatewaySessionCommandsMixin:
         compressor = getattr(agent, "context_compressor", None)
         count_before = getattr(compressor, "compression_count", 0)
         try:
-            await self._run_in_executor_with_context(lambda: agent._compress_context([], "", force=True))
+            await self._run_in_executor_with_context(
+                lambda: agent._compress_context([], "", force=True, task_id=session_id))
         except Exception as exc:
             return t("gateway.compress.failed", error=exc)
         if getattr(compressor, "compression_count", 0) > count_before:
diff --git a/tests/gateway/test_codex_hygiene_compaction.py b/tests/gateway/test_codex_hygiene_compaction.py
index 553943e15b..c9c4454cc2 100644
--- a/tests/gateway/test_codex_hygiene_compaction.py
+++ b/tests/gateway/test_codex_hygiene_compaction.py
@@ -331,6 +331,34 @@ def test_manual_compress_routes_to_live_thread():
     assert "compacted" in reply
 
 
+@pytest.mark.parametrize("entry", ["hygiene", "manual"])
+def test_codex_compaction_releases_the_live_sessions_read_dedup(tmp_path, entry, monkeypatch):
+    """Both out-of-turn codex compaction entry points reset the read_file dedup under the LIVE
+    session row id — the task_id the main turn hands to run_conversation — not the "default"
+    bucket, so a post-compaction re-read returns content instead of a stub (#98206)."""
+    from tools import file_tools_read_tracking as tracking
+
+    tracker = {
+        "sess-1": {"dedup_generation_reads": {"/live/file.py"}},
+        "default": {"dedup_generation_reads": {"/other/file.py"}},
+    }
+    monkeypatch.setattr(tracking, "_read_tracker", tracker)
+    agent = LiveCodexAgent(mode="hermes")
+
+    if entry == "hygiene":
+        gw, _db = _gateway(tmp_path, "tg:123", agent)
+        outcome = asyncio.run(run_codex_hygiene_compaction(
+            gw, "tg:123", agent.session_id, auto_mode="hermes", history=_history(),
+            approx_tokens=345_000, timeout_seconds=30.0))
+        assert outcome == "compacted"
+    else:
+        reply = asyncio.run(_slash_host(agent)._compress_codex_app_server_session("tg:123", agent.session_id))
+        assert "compacted" in reply
+
+    assert tracker["sess-1"]["dedup_generation_reads"] == set()
+    assert tracker["default"]["dedup_generation_reads"] == {"/other/file.py"}
+
+
 def test_manual_compress_without_live_thread_reports_honestly():
     host = _slash_host(None)
     reply = asyncio.run(