diff --git a/nanobot/agent/loop.py b/nanobot/agent/loop.py
index d87c748e2..7e4610049 100644
--- a/nanobot/agent/loop.py
+++ b/nanobot/agent/loop.py
@@ -32,7 +32,11 @@ from nanobot.command import CommandContext, CommandRouter, register_builtin_comm
 from nanobot.config.schema import AgentDefaults, ModelPresetConfig
 from nanobot.providers.base import LLMProvider
 from nanobot.providers.factory import ProviderSnapshot
-from nanobot.session.goal_state import goal_state_runtime_lines, goal_state_ws_blob
+from nanobot.session.goal_state import (
+    goal_state_runtime_lines,
+    goal_state_ws_blob,
+    sustained_goal_active,
+)
 from nanobot.session.manager import Session, SessionManager
 from nanobot.utils.artifacts import generated_image_paths_from_messages
 from nanobot.utils.document import extract_documents
@@ -789,6 +793,13 @@ class AgentLoop:
                 retry_wait_callback=on_retry_wait,
                 checkpoint_callback=_checkpoint,
                 injection_callback=_drain_pending,
+                # Sustained goals may legitimately exceed NANOBOT_LLM_TIMEOUT_S; idle stall
+                # is still capped by NANOBOT_STREAM_IDLE_TIMEOUT_S in streaming providers.
+                llm_timeout_s=(
+                    0.0
+                    if session is not None and sustained_goal_active(session.metadata)
+                    else None
+                ),
             ))
         finally:
             reset_file_states(file_state_token)
diff --git a/nanobot/session/goal_state.py b/nanobot/session/goal_state.py
index 2f32e6c25..9992dd789 100644
--- a/nanobot/session/goal_state.py
+++ b/nanobot/session/goal_state.py
@@ -35,6 +35,12 @@ def goal_state_raw(metadata: Mapping[str, Any] | None) -> Any:
     return _session_goal_raw(metadata)
 
 
+def sustained_goal_active(metadata: Mapping[str, Any] | None) -> bool:
+    """True when this session has an active sustained objective (``long_task`` bookkeeping)."""
+    goal = parse_goal_state(goal_state_raw(metadata))
+    return isinstance(goal, dict) and goal.get("status") == "active"
+
+
 def parse_goal_state(blob: Any) -> dict[str, Any] | None:
     if blob is None:
         return None
diff --git a/tests/session/test_goal_state.py b/tests/session/test_goal_state.py
index 9a83fd467..991d51513 100644
--- a/tests/session/test_goal_state.py
+++ b/tests/session/test_goal_state.py
@@ -8,6 +8,7 @@ from nanobot.session.goal_state import (
     goal_state_runtime_lines,
     goal_state_ws_blob,
     parse_goal_state,
+    sustained_goal_active,
 )
 
 
@@ -88,3 +89,19 @@ def test_goal_state_ws_blob_active_shape():
         "ui_summary": "feat",
         "objective": "Build feature.",
     }
+
+
+def test_sustained_goal_active_false_when_missing_or_completed():
+    assert sustained_goal_active(None) is False
+    assert sustained_goal_active({}) is False
+    assert sustained_goal_active({GOAL_STATE_KEY: {"status": "completed", "objective": "x"}}) is False
+
+
+def test_sustained_goal_active_true_when_active():
+    meta = {GOAL_STATE_KEY: {"status": "active", "objective": "Run long task."}}
+    assert sustained_goal_active(meta) is True
+
+
+def test_sustained_goal_active_respects_legacy_thread_goal_key():
+    meta = {"thread_goal": {"status": "active", "objective": "Legacy."}}
+    assert sustained_goal_active(meta) is True