diff --git a/crates/openfang-api/src/routes.rs b/crates/openfang-api/src/routes.rs
index 456d867f0..a7b18f3af 100644
--- a/crates/openfang-api/src/routes.rs
+++ b/crates/openfang-api/src/routes.rs
@@ -225,6 +225,7 @@ pub async fn list_agents(State(state): State<Arc<AppState>>) -> impl IntoRespons
                 "auth_status": auth_status,
                 "ready": ready,
                 "profile": e.manifest.profile,
+                "temperature": e.manifest.model.temperature,
                 "identity": {
                     "emoji": e.identity.emoji,
                     "avatar_url": e.identity.avatar_url,
@@ -1362,6 +1363,7 @@ pub async fn get_agent(
             "mcp_servers": entry.manifest.mcp_servers,
             "mcp_servers_mode": if entry.manifest.mcp_servers.is_empty() { "all" } else { "allowlist" },
             "fallback_models": entry.manifest.fallback_models,
+            "temperature": entry.manifest.model.temperature,
         })),
     )
 }
@@ -8644,6 +8646,7 @@ pub struct PatchAgentConfigRequest {
     pub api_key_env: Option<String>,
     pub base_url: Option<String>,
     pub fallback_models: Option<Vec<openfang_types::agent::FallbackModel>>,
+    pub temperature: Option<f32>,
 }
 
 /// PATCH /api/agents/{id}/config — Hot-update agent name, description, system prompt, and identity.
@@ -8865,6 +8868,27 @@ pub async fn patch_agent_config(
         }
     }
 
+    // Update temperature
+    if let Some(temp) = req.temperature {
+        if !(0.0..=2.0).contains(&temp) {
+            return (
+                StatusCode::BAD_REQUEST,
+                Json(serde_json::json!({"error": "Temperature must be between 0.0 and 2.0"})),
+            );
+        }
+        if state
+            .kernel
+            .registry
+            .update_temperature(agent_id, temp)
+            .is_err()
+        {
+            return (
+                StatusCode::NOT_FOUND,
+                Json(serde_json::json!({"error": "Agent not found"})),
+            );
+        }
+    }
+
     // Persist updated manifest to database so changes survive restart
     if let Some(entry) = state.kernel.registry.get(agent_id) {
         if let Err(e) = state.kernel.memory.save_agent(&entry) {
diff --git a/crates/openfang-api/static/index_body.html b/crates/openfang-api/static/index_body.html
index 539f1aa29..e30bc18a5 100644
--- a/crates/openfang-api/static/index_body.html
+++ b/crates/openfang-api/static/index_body.html
@@ -1025,6 +1025,7 @@ <h3>
                 <div x-show="detailTab === 'config'">
                   <div class="form-group"><label>Name</label><input class="form-input" x-model="configForm.name"></div>
                   <div class="form-group"><label>System Prompt</label><textarea class="form-textarea" x-model="configForm.system_prompt" style="height:80px"></textarea></div>
+                  <div class="form-group"><label>Temperature</label><input type="number" class="form-input" x-model.number="configForm.temperature" min="0" max="2" step="0.05" style="width:100px"></div>
                   <div class="form-group"><label>Emoji</label>
                     <div class="emoji-grid">
                       <template x-for="em in emojiOptions" :key="em">
diff --git a/crates/openfang-api/static/js/pages/agents.js b/crates/openfang-api/static/js/pages/agents.js
index 86ecfaf3a..2e1d40655 100644
--- a/crates/openfang-api/static/js/pages/agents.js
+++ b/crates/openfang-api/static/js/pages/agents.js
@@ -351,7 +351,8 @@ function agentsPage() {
         emoji: (agent.identity && agent.identity.emoji) || '',
         color: (agent.identity && agent.identity.color) || '#FF5C00',
         archetype: (agent.identity && agent.identity.archetype) || '',
-        vibe: (agent.identity && agent.identity.vibe) || ''
+        vibe: (agent.identity && agent.identity.vibe) || '',
+        temperature: agent.temperature != null ? agent.temperature : 0.7
       };
       this.showDetailModal = true;
       // Fetch full agent detail to get fallback_models
diff --git a/crates/openfang-kernel/src/kernel.rs b/crates/openfang-kernel/src/kernel.rs
index 5e582d048..a9a0311d7 100644
--- a/crates/openfang-kernel/src/kernel.rs
+++ b/crates/openfang-kernel/src/kernel.rs
@@ -1996,19 +1996,24 @@ impl OpenFangKernel {
                     // Persist usage to database (same as non-streaming path)
                     let model = &manifest.model.model;
                     let cost = MeteringEngine::estimate_cost_with_catalog(
-                        &kernel_clone.model_catalog.read().unwrap_or_else(|e| e.into_inner()),
+                        &kernel_clone
+                            .model_catalog
+                            .read()
+                            .unwrap_or_else(|e| e.into_inner()),
                         model,
                         result.total_usage.input_tokens,
                         result.total_usage.output_tokens,
                     );
-                    let _ = kernel_clone.metering.record(&openfang_memory::usage::UsageRecord {
-                        agent_id,
-                        model: model.clone(),
-                        input_tokens: result.total_usage.input_tokens,
-                        output_tokens: result.total_usage.output_tokens,
-                        cost_usd: cost,
-                        tool_calls: result.iterations.saturating_sub(1),
-                    });
+                    let _ = kernel_clone
+                        .metering
+                        .record(&openfang_memory::usage::UsageRecord {
+                            agent_id,
+                            model: model.clone(),
+                            input_tokens: result.total_usage.input_tokens,
+                            output_tokens: result.total_usage.output_tokens,
+                            cost_usd: cost,
+                            tool_calls: result.iterations.saturating_sub(1),
+                        });
 
                     let _ = kernel_clone
                         .registry
@@ -3216,6 +3221,24 @@ impl OpenFangKernel {
                 other => KernelError::OpenFang(OpenFangError::Internal(other.to_string())),
             })?;
 
+        // Capture API-patched fields from the existing agent before manifest rebuild.
+        // The rebuild below overwrites everything from HAND.toml, so we save the live
+        // values here and reapply them after — making API changes durable across restarts.
+        let existing_agent = self
+            .registry
+            .list()
+            .into_iter()
+            .find(|e| e.name == def.agent.name);
+        let existing_tool_filters: (Vec<String>, Vec<String>) = existing_agent
+            .as_ref()
+            .map(|e| {
+                (
+                    e.manifest.tool_allowlist.clone(),
+                    e.manifest.tool_blocklist.clone(),
+                )
+            })
+            .unwrap_or_default();
+
         // Build an agent manifest from the hand definition.
         // If the hand declares provider/model as "default", inherit the kernel's configured LLM.
         let hand_provider = if def.agent.provider == "default" {
@@ -3229,6 +3252,21 @@ impl OpenFangKernel {
             def.agent.model.clone()
         };
 
+        // Detect API-patched model config: compare the live agent's provider/model/temperature
+        // against what HAND.toml would produce. A difference means an API call changed it —
+        // preserve those values so they survive respawn.
+        let existing_model_override: Option<(String, String, f32)> = existing_agent.and_then(|e| {
+            let m = &e.manifest.model;
+            if m.provider != hand_provider
+                || m.model != hand_model
+                || (m.temperature - def.agent.temperature).abs() > f32::EPSILON
+            {
+                Some((m.provider.clone(), m.model.clone(), m.temperature))
+            } else {
+                None
+            }
+        });
+
         let mut manifest = AgentManifest {
             name: def.agent.name.clone(),
             description: def.agent.description.clone(),
@@ -3287,6 +3325,25 @@ impl OpenFangKernel {
             ..Default::default()
         };
 
+        // Restore API-patched tool filters so they survive respawn.
+        // Only apply if non-empty — an empty saved list means "no override set", not "block all".
+        let (saved_allowlist, saved_blocklist) = existing_tool_filters;
+        if !saved_allowlist.is_empty() {
+            manifest.tool_allowlist = saved_allowlist;
+        }
+        if !saved_blocklist.is_empty() {
+            manifest.tool_blocklist = saved_blocklist;
+        }
+
+        // Restore API-patched model config so provider/model/temperature survive respawn.
+        // system_prompt is intentionally excluded — it is assembled from HAND.toml + settings
+        // context by this function and must stay dynamic.
+        if let Some((provider, model, temperature)) = existing_model_override {
+            manifest.model.provider = provider;
+            manifest.model.model = model;
+            manifest.model.temperature = temperature;
+        }
+
         // Resolve hand settings → prompt block + env vars
         let resolved = openfang_hands::resolve_settings(&def.settings, &instance.config);
         if !resolved.prompt_block.is_empty() {
@@ -5164,10 +5221,18 @@ impl OpenFangKernel {
             .unwrap_or_default();
 
         if !tool_allowlist.is_empty() {
-            all_tools.retain(|t| tool_allowlist.iter().any(|a| a == &t.name));
+            all_tools.retain(|t| {
+                tool_allowlist
+                    .iter()
+                    .any(|a| a.to_lowercase() == t.name.to_lowercase())
+            });
         }
         if !tool_blocklist.is_empty() {
-            all_tools.retain(|t| !tool_blocklist.iter().any(|b| b == &t.name));
+            all_tools.retain(|t| {
+                !tool_blocklist
+                    .iter()
+                    .any(|b| b.to_lowercase() == t.name.to_lowercase())
+            });
         }
 
         // Step 5: Remove shell_exec if exec_policy denies it.
diff --git a/crates/openfang-kernel/src/registry.rs b/crates/openfang-kernel/src/registry.rs
index b3c3a4962..13ee5388b 100644
--- a/crates/openfang-kernel/src/registry.rs
+++ b/crates/openfang-kernel/src/registry.rs
@@ -160,6 +160,17 @@ impl AgentRegistry {
         Ok(())
     }
 
+    /// Update an agent's sampling temperature.
+    pub fn update_temperature(&self, id: AgentId, temperature: f32) -> OpenFangResult<()> {
+        let mut entry = self
+            .agents
+            .get_mut(&id)
+            .ok_or_else(|| OpenFangError::AgentNotFound(id.to_string()))?;
+        entry.manifest.model.temperature = temperature;
+        entry.last_active = chrono::Utc::now();
+        Ok(())
+    }
+
     /// Update an agent's model AND provider together.
     pub fn update_model_and_provider(
         &self,
diff --git a/crates/openfang-runtime/src/drivers/mod.rs b/crates/openfang-runtime/src/drivers/mod.rs
index b25c6aed5..6729fe108 100644
--- a/crates/openfang-runtime/src/drivers/mod.rs
+++ b/crates/openfang-runtime/src/drivers/mod.rs
@@ -791,9 +791,7 @@ mod tests {
         let config = DriverConfig {
             provider: "azure".to_string(),
             api_key: Some("test-azure-key".to_string()),
-            base_url: Some(
-                "https://myresource.openai.azure.com/openai/deployments".to_string(),
-            ),
+            base_url: Some("https://myresource.openai.azure.com/openai/deployments".to_string()),
             skip_permissions: true,
         };
         let driver = create_driver(&config);
@@ -805,9 +803,7 @@ mod tests {
         let config = DriverConfig {
             provider: "azure".to_string(),
             api_key: None,
-            base_url: Some(
-                "https://myresource.openai.azure.com/openai/deployments".to_string(),
-            ),
+            base_url: Some("https://myresource.openai.azure.com/openai/deployments".to_string()),
             skip_permissions: true,
         };
         let result = create_driver(&config);
@@ -843,9 +839,7 @@ mod tests {
         let config = DriverConfig {
             provider: "azure-openai".to_string(),
             api_key: Some("test-azure-key".to_string()),
-            base_url: Some(
-                "https://myresource.openai.azure.com/openai/deployments".to_string(),
-            ),
+            base_url: Some("https://myresource.openai.azure.com/openai/deployments".to_string()),
             skip_permissions: true,
         };
         let driver = create_driver(&config);
diff --git a/crates/openfang-runtime/src/drivers/openai.rs b/crates/openfang-runtime/src/drivers/openai.rs
index 54f551811..2ef6ab9f7 100644
--- a/crates/openfang-runtime/src/drivers/openai.rs
+++ b/crates/openfang-runtime/src/drivers/openai.rs
@@ -99,8 +99,7 @@ impl OpenAIDriver {
         if self.azure_mode {
             builder = builder.header("api-key", self.api_key.as_str());
         } else {
-            builder =
-                builder.header("authorization", format!("Bearer {}", self.api_key.as_str()));
+            builder = builder.header("authorization", format!("Bearer {}", self.api_key.as_str()));
         }
         builder
     }
diff --git a/crates/openfang-runtime/src/model_catalog.rs b/crates/openfang-runtime/src/model_catalog.rs
index 7ffe402a4..ad67c6486 100644
--- a/crates/openfang-runtime/src/model_catalog.rs
+++ b/crates/openfang-runtime/src/model_catalog.rs
@@ -5,12 +5,11 @@
 
 use openfang_types::model_catalog::{
     AuthStatus, ModelCatalogEntry, ModelTier, ProviderInfo, AI21_BASE_URL, ANTHROPIC_BASE_URL,
-    AZURE_OPENAI_BASE_URL, BEDROCK_BASE_URL, CEREBRAS_BASE_URL, CHUTES_BASE_URL,
-    COHERE_BASE_URL, DEEPSEEK_BASE_URL, FIREWORKS_BASE_URL, GEMINI_BASE_URL,
-    GITHUB_COPILOT_BASE_URL, GROQ_BASE_URL, HUGGINGFACE_BASE_URL, KIMI_CODING_BASE_URL,
-    LEMONADE_BASE_URL, LMSTUDIO_BASE_URL, MINIMAX_BASE_URL, MISTRAL_BASE_URL,
-    MOONSHOT_BASE_URL, NVIDIA_NIM_BASE_URL, OLLAMA_BASE_URL, OPENAI_BASE_URL,
-    OPENROUTER_BASE_URL, PERPLEXITY_BASE_URL, QIANFAN_BASE_URL, QWEN_BASE_URL,
+    AZURE_OPENAI_BASE_URL, BEDROCK_BASE_URL, CEREBRAS_BASE_URL, CHUTES_BASE_URL, COHERE_BASE_URL,
+    DEEPSEEK_BASE_URL, FIREWORKS_BASE_URL, GEMINI_BASE_URL, GITHUB_COPILOT_BASE_URL, GROQ_BASE_URL,
+    HUGGINGFACE_BASE_URL, KIMI_CODING_BASE_URL, LEMONADE_BASE_URL, LMSTUDIO_BASE_URL,
+    MINIMAX_BASE_URL, MISTRAL_BASE_URL, MOONSHOT_BASE_URL, NVIDIA_NIM_BASE_URL, OLLAMA_BASE_URL,
+    OPENAI_BASE_URL, OPENROUTER_BASE_URL, PERPLEXITY_BASE_URL, QIANFAN_BASE_URL, QWEN_BASE_URL,
     REPLICATE_BASE_URL, SAMBANOVA_BASE_URL, TOGETHER_BASE_URL, VENICE_BASE_URL, VLLM_BASE_URL,
     VOLCENGINE_BASE_URL, VOLCENGINE_CODING_BASE_URL, XAI_BASE_URL, ZAI_BASE_URL,
     ZAI_CODING_BASE_URL, ZHIPU_BASE_URL, ZHIPU_CODING_BASE_URL,