diff --git a/crates/openfang-kernel/src/kernel.rs b/crates/openfang-kernel/src/kernel.rs
index 5e582d048..ca96e4602 100644
--- a/crates/openfang-kernel/src/kernel.rs
+++ b/crates/openfang-kernel/src/kernel.rs
@@ -5715,6 +5715,12 @@ impl KernelHandle for OpenFangKernel {
             .collect()
     }
 
+    fn touch_agent(&self, agent_id: &str) {
+        if let Ok(id) = agent_id.parse::<AgentId>() {
+            self.registry.touch(id);
+        }
+    }
+
     fn kill_agent(&self, agent_id: &str) -> Result<(), String> {
         let id: AgentId = agent_id
             .parse()
diff --git a/crates/openfang-kernel/src/registry.rs b/crates/openfang-kernel/src/registry.rs
index b3c3a4962..0852a658e 100644
--- a/crates/openfang-kernel/src/registry.rs
+++ b/crates/openfang-kernel/src/registry.rs
@@ -235,6 +235,14 @@ impl AgentRegistry {
         Ok(())
     }
 
+    /// Touch an agent — refresh last_active without changing any other state.
+    /// Used by the agent loop to prevent heartbeat false-positives during long LLM calls.
+    pub fn touch(&self, id: AgentId) {
+        if let Some(mut entry) = self.agents.get_mut(&id) {
+            entry.last_active = chrono::Utc::now();
+        }
+    }
+
     /// Update an agent's system prompt (hot-swap, takes effect on next message).
     pub fn update_system_prompt(&self, id: AgentId, new_prompt: String) -> OpenFangResult<()> {
         let mut entry = self
diff --git a/crates/openfang-runtime/src/agent_loop.rs b/crates/openfang-runtime/src/agent_loop.rs
index 2fd481d68..9830b6287 100644
--- a/crates/openfang-runtime/src/agent_loop.rs
+++ b/crates/openfang-runtime/src/agent_loop.rs
@@ -348,6 +348,12 @@ pub async fn run_agent_loop(
             cb(LoopPhase::Thinking);
         }
 
+        // Stamp last_active before the (potentially long) LLM call so the
+        // heartbeat monitor doesn't flag us as unresponsive mid-iteration.
+        if let Some(k) = &kernel {
+            k.touch_agent(&agent_id_str);
+        }
+
         // Call LLM with retry, error classification, and circuit breaker
         let provider_name = manifest.model.provider.as_str();
         let mut response = call_with_retry(&*driver, request, Some(provider_name), None).await?;
diff --git a/crates/openfang-runtime/src/kernel_handle.rs b/crates/openfang-runtime/src/kernel_handle.rs
index 00f195599..e3e1b7633 100644
--- a/crates/openfang-runtime/src/kernel_handle.rs
+++ b/crates/openfang-runtime/src/kernel_handle.rs
@@ -238,6 +238,12 @@ pub trait KernelHandle: Send + Sync {
         Err("Channel file data send not available".to_string())
     }
 
+    /// Refresh an agent's last_active timestamp without changing any other state.
+    /// Called by the agent loop before long LLM calls to prevent heartbeat false-positives.
+    fn touch_agent(&self, agent_id: &str) {
+        let _ = agent_id;
+    }
+
     /// Spawn an agent with capability inheritance enforcement.
     /// `parent_caps` are the parent's granted capabilities. The kernel MUST verify
     /// that every capability in the child manifest is covered by `parent_caps`.