Persist agent stats across restarts, add per-tool metrics grid

Stats now survive daemon restarts via ~/.consciousness/agent-stats.json,
loaded into a global Mutex<HashMap> on first access. Each tool type
tracks last count, EWMA (alpha=0.3), and total calls.

UI shows a grid view: tool | last | avg | total, sorted by total desc.
Failures row appears at bottom if any occurred.

Also fixes temperature/priority not being applied to spawned agents.

Co-Authored-By: Proof of Concept <poc@bcachefs.org>

src/agent/oneshot.rs

@@ -22,13 +22,66 @@ use super::Agent;
 // Agent logging — shared by Mind and CLI paths
 // ---------------------------------------------------------------------------
 
-#[derive(Clone, serde::Serialize)]
+/// Stats from a single run.
+#[derive(Clone, Default, serde::Serialize, serde::Deserialize)]
 pub struct RunStats {
     pub messages: usize,
     pub tool_calls: usize,
+    pub tool_failures: usize,
     pub tool_calls_by_type: HashMap<String, usize>,
 }
 
+/// Per-tool accumulated stats.
+#[derive(Clone, Default, serde::Serialize, serde::Deserialize)]
+pub struct ToolStats {
+    pub last: usize,
+    pub ewma: f64,
+    pub total: usize,
+}
+
+/// Persisted stats for an agent (survives restarts).
+#[derive(Clone, Default, serde::Serialize, serde::Deserialize)]
+pub struct PersistedStats {
+    pub runs: usize,
+    pub last_stats: Option<RunStats>,
+    /// Per-tool-type stats: last, ewma, total.
+    pub by_tool: HashMap<String, ToolStats>,
+    /// Failed calls stats.
+    pub failures: ToolStats,
+}
+
+fn stats_path() -> std::path::PathBuf {
+    dirs::home_dir().unwrap_or_default()
+        .join(".consciousness/agent-stats.json")
+}
+
+static AGENT_STATS: std::sync::OnceLock<std::sync::Mutex<HashMap<String, PersistedStats>>> =
+    std::sync::OnceLock::new();
+
+fn stats_map() -> &'static std::sync::Mutex<HashMap<String, PersistedStats>> {
+    AGENT_STATS.get_or_init(|| {
+        let map: HashMap<String, PersistedStats> = std::fs::read_to_string(stats_path()).ok()
+            .and_then(|s| serde_json::from_str(&s).ok())
+            .unwrap_or_default();
+        std::sync::Mutex::new(map)
+    })
+}
+
+pub fn get_stats(name: &str) -> PersistedStats {
+    stats_map().lock().ok()
+        .and_then(|m| m.get(name).cloned())
+        .unwrap_or_default()
+}
+
+pub fn set_stats(name: &str, stats: PersistedStats) {
+    if let Ok(mut map) = stats_map().lock() {
+        map.insert(name.to_string(), stats);
+        if let Ok(json) = serde_json::to_string_pretty(&*map) {
+            let _ = std::fs::write(stats_path(), json);
+        }
+    }
+}
+
 /// Save agent conversation to JSON log file.
 /// Used by both mind-run agents and CLI-run agents.
 pub async fn save_agent_log(name: &str, agent: &std::sync::Arc<Agent>) -> RunStats {
@@ -57,6 +110,7 @@ fn compute_run_stats(conversation: &[super::context::AstNode]) -> RunStats {
 
     let mut messages = 0usize;
     let mut tool_calls = 0usize;
+    let mut tool_failures = 0usize;
     let mut by_type: HashMap<String, usize> = HashMap::new();
 
     for node in conversation {
@@ -64,16 +118,27 @@ fn compute_run_stats(conversation: &[super::context::AstNode]) -> RunStats {
             messages += 1;
             for child in children {
                 if let AstNode::Leaf(leaf) = child {
-                    if let NodeBody::ToolCall { name, .. } = leaf.body() {
-                        tool_calls += 1;
-                        *by_type.entry(name.to_string()).or_default() += 1;
+                    match leaf.body() {
+                        NodeBody::ToolCall { name, .. } => {
+                            tool_calls += 1;
+                            *by_type.entry(name.to_string()).or_default() += 1;
+                        }
+                        NodeBody::ToolResult(text) => {
+                            // Detect failures from error patterns in result
+                            let t = text.trim_start();
+                            if t.starts_with("Error") || t.starts_with("error:") ||
+                               t.starts_with("Failed") || t.contains("not found") {
+                                tool_failures += 1;
+                            }
+                        }
+                        _ => {}
                     }
                 }
             }
         }
     }
 
-    RunStats { messages, tool_calls, tool_calls_by_type: by_type }
+    RunStats { messages, tool_calls, tool_failures, tool_calls_by_type: by_type }
 }
 
 // ---------------------------------------------------------------------------
@@ -96,8 +161,11 @@ pub struct AutoAgent {
     pub current_phase: String,
     pub turn: usize,
     pub enabled: bool,
+    pub temperature: f32,
+    pub priority: i32,
 }
 
+
 /// Per-run conversation backend — wraps a forked agent.
 struct Backend(std::sync::Arc<Agent>);
 
@@ -160,14 +228,16 @@ impl AutoAgent {
         name: String,
         tools: Vec<agent_tools::Tool>,
         steps: Vec<AutoStep>,
-        _temperature: f32,
-        _priority: i32,
+        temperature: f32,
+        priority: i32,
     ) -> Self {
         Self {
             name, tools, steps,
             current_phase: String::new(),
             turn: 0,
             enabled: true,
+            temperature,
+            priority,
         }
     }
 
@@ -203,7 +273,8 @@ impl AutoAgent {
             let mut st = agent.state.lock().await;
             st.provenance = format!("standalone:{}", self.name);
             st.tools = self.tools.clone();
-            st.priority = Some(10);
+            st.temperature = self.temperature;
+            st.priority = Some(self.priority);
         }
 
         let mut backend = Backend(agent.clone());
@@ -242,6 +313,36 @@ impl AutoAgent {
         result
     }
 
+    /// Update stats after a run completes. Called with the stats from save_agent_log.
+    pub fn update_stats(&self, run_stats: RunStats) {
+        const ALPHA: f64 = 0.3;
+        let old = get_stats(&self.name);
+
+        // Update per-tool stats
+        let mut by_tool = old.by_tool;
+        for (tool, count) in &run_stats.tool_calls_by_type {
+            let entry = by_tool.entry(tool.clone()).or_default();
+            entry.last = *count;
+            entry.ewma = ALPHA * (*count as f64) + (1.0 - ALPHA) * entry.ewma;
+            entry.total += count;
+        }
+
+        // Update failure stats
+        let failures = ToolStats {
+            last: run_stats.tool_failures,
+            ewma: ALPHA * (run_stats.tool_failures as f64) + (1.0 - ALPHA) * old.failures.ewma,
+            total: old.failures.total + run_stats.tool_failures,
+        };
+
+        let new = PersistedStats {
+            runs: old.runs + 1,
+            last_stats: Some(run_stats),
+            by_tool,
+            failures,
+        };
+        set_stats(&self.name, new);
+    }
+
     async fn run_with_backend(
         &mut self,
         backend: &mut Backend,

src/mind/subconscious.rs

@@ -294,6 +294,7 @@ pub struct SubconsciousSnapshot {
     pub enabled: bool,
     pub current_phase: String,
     pub turn: usize,
+    pub runs: usize,
     pub last_run_secs_ago: Option<f64>,
     /// Shared handle to the forked agent — UI locks to read entries.
     pub forked_agent: Option<Arc<crate::agent::Agent>>,
@@ -303,6 +304,9 @@ pub struct SubconsciousSnapshot {
     pub state: std::collections::BTreeMap<String, String>,
     /// Recent store activity for this agent: (key, timestamp), newest first.
     pub history: Vec<(String, i64)>,
+    pub last_stats: Option<crate::agent::oneshot::RunStats>,
+    pub tool_calls_ewma: f64,
+    pub tool_failures_ewma: f64,
 }
 
 struct SubconsciousAgent {
@@ -361,17 +365,23 @@ impl SubconsciousAgent {
     }
 
     fn snapshot(&self, state: &std::collections::BTreeMap<String, String>, history: Vec<(String, i64)>) -> SubconsciousSnapshot {
+        let stats = crate::agent::oneshot::get_stats(&self.name);
+        let tool_calls_ewma: f64 = stats.by_tool.values().map(|t| t.ewma).sum();
         SubconsciousSnapshot {
             name: self.name.clone(),
             running: self.is_running(),
             enabled: self.auto.enabled,
             current_phase: self.auto.current_phase.clone(),
             turn: self.auto.turn,
+            runs: stats.runs,
             last_run_secs_ago: self.last_run.map(|t| t.elapsed().as_secs_f64()),
             forked_agent: self.forked_agent.clone(),
             fork_point: self.fork_point,
             state: state.clone(),
             history,
+            last_stats: stats.last_stats.clone(),
+            tool_calls_ewma,
+            tool_failures_ewma: stats.failures.ewma,
         }
     }
 }
@@ -477,7 +487,7 @@ impl Subconscious {
             any_finished = true;
 
             let (auto_back, result) = handle.await.unwrap_or_else(
-                |e| (AutoAgent::new(String::new(), vec![], vec![], 0.0, 0),
+                |e| (AutoAgent::new(String::new(), vec![], vec![], 0.6, 0),
                      Err(format!("task panicked: {}", e))));
             self.agents[i].auto = auto_back;
 
@@ -576,7 +586,7 @@ impl Subconscious {
             self.agents[i].last_trigger_bytes = conversation_bytes;
 
             let auto = std::mem::replace(&mut self.agents[i].auto,
-                AutoAgent::new(String::new(), vec![], vec![], 0.0, 0));
+                AutoAgent::new(String::new(), vec![], vec![], 0.6, 0));
             to_run.push((i, auto));
         }
 
@@ -596,9 +606,10 @@ impl Subconscious {
             {
                 let mut st = forked.state.lock().await;
                 st.provenance = auto.name.clone();
+                st.temperature = auto.temperature;
                 // Surface agent gets near-interactive priority;
                 // other subconscious agents get lower priority.
-                st.priority = Some(if auto.name == "surface" { 1 } else { 2 });
+                st.priority = Some(if auto.name == "surface" { 1 } else { auto.priority });
             }
             let fork_point = forked.context.lock().await.conversation().len();
 
@@ -614,7 +625,8 @@ impl Subconscious {
 
             self.agents[idx].handle = Some(tokio::spawn(async move {
                 let result = auto.run_forked_shared(&forked, &keys, &st, &recent).await;
-                crate::agent::oneshot::save_agent_log(&auto.name, &forked).await;
+                let stats = crate::agent::oneshot::save_agent_log(&auto.name, &forked).await;
+                auto.update_stats(stats);
                 (auto, result)
             }));
         }

src/mind/unconscious.rs

@@ -34,12 +34,10 @@ struct UnconsciousAgent {
     name: String,
     enabled: bool,
     auto: AutoAgent,
-    handle: Option<tokio::task::JoinHandle<(AutoAgent, Result<String, String>, RunStats)>>,
+    handle: Option<tokio::task::JoinHandle<(AutoAgent, Result<String, String>)>>,
     /// Shared agent handle — UI locks to read context live.
     pub agent: Option<std::sync::Arc<crate::agent::Agent>>,
     last_run: Option<Instant>,
-    runs: usize,
-    last_stats: Option<RunStats>,
 }
 
 impl UnconsciousAgent {
@@ -64,6 +62,8 @@ pub struct UnconsciousSnapshot {
     pub last_stats: Option<RunStats>,
     /// Recent store activity for this agent: (key, timestamp), newest first.
     pub history: Vec<(String, i64)>,
+    pub tool_calls_ewma: f64,
+    pub tool_failures_ewma: f64,
 }
 
 pub struct Unconscious {
@@ -107,8 +107,6 @@ impl Unconscious {
                 handle: None,
                 agent: None,
                 last_run: None,
-                runs: 0,
-                last_stats: None,
             });
         }
         agents.sort_by(|a, b| a.name.cmp(&b.name));
@@ -144,15 +142,19 @@ impl Unconscious {
         self.agents.iter().map(|a| {
             let history = store.map(|st| st.recent_by_provenance(&a.name, 30))
                 .unwrap_or_default();
+            let stats = crate::agent::oneshot::get_stats(&a.name);
+            let tool_calls_ewma: f64 = stats.by_tool.values().map(|t| t.ewma).sum();
             UnconsciousSnapshot {
                 name: a.name.clone(),
                 running: a.is_running(),
                 enabled: a.enabled,
-                runs: a.runs,
+                runs: stats.runs,
                 last_run_secs_ago: a.last_run.map(|t| t.elapsed().as_secs_f64()),
                 agent: a.agent.clone(),
-                last_stats: a.last_stats.clone(),
+                last_stats: stats.last_stats.clone(),
                 history,
+                tool_calls_ewma,
+                tool_failures_ewma: stats.failures.ewma,
             }
         }).collect()
     }
@@ -180,15 +182,13 @@ impl Unconscious {
             if agent.handle.as_ref().is_some_and(|h| h.is_finished()) {
                 let handle = agent.handle.take().unwrap();
                 agent.last_run = Some(Instant::now());
-                agent.runs += 1;
-                // Get the AutoAgent back from the finished task
+                // Get the AutoAgent back from the finished task (stats already updated)
                 match handle.now_or_never() {
-                    Some(Ok((auto_back, result, stats))) => {
+                    Some(Ok((auto_back, result))) => {
                         agent.auto = auto_back;
-                        agent.last_stats = Some(stats);
                         match result {
                             Ok(_) => dbglog!("[unconscious] {} completed (run {})",
-                                agent.name, agent.runs),
+                                agent.name, crate::agent::oneshot::get_stats(&agent.name).runs),
                             Err(e) => dbglog!("[unconscious] {} failed: {}", agent.name, e),
                         }
                     }
@@ -244,7 +244,7 @@ impl Unconscious {
 
         // Swap auto out, replace steps with resolved prompts
         let mut auto = std::mem::replace(&mut self.agents[idx].auto,
-            AutoAgent::new(String::new(), vec![], vec![], 0.0, 0));
+            AutoAgent::new(String::new(), vec![], vec![], 0.6, 0));
         let orig_steps = std::mem::replace(&mut auto.steps,
             batch.steps.iter().map(|s| AutoStep {
                 prompt: s.prompt.clone(),
@@ -293,7 +293,8 @@ impl Unconscious {
         {
             let mut st = agent.state.lock().await;
             st.provenance = auto.name.clone();
-            st.priority = Some(10);
+            st.priority = Some(auto.priority);
+            st.temperature = auto.temperature;
         }
 
         self.agents[idx].agent = Some(agent.clone());
@@ -301,8 +302,9 @@ impl Unconscious {
         self.agents[idx].handle = Some(tokio::spawn(async move {
             let result = auto.run_shared(&agent).await;
             let stats = crate::agent::oneshot::save_agent_log(&auto.name, &agent).await;
+            auto.update_stats(stats);
             auto.steps = orig_steps;
-            (auto, result, stats)
+            (auto, result)
         }));
     }
 }

src/user/subconscious.rs

@@ -18,10 +18,10 @@ use super::{App, ScreenView, screen_legend};
 use super::widgets::{SectionTree, SectionView, section_to_view, pane_block_focused, tree_legend, format_age, format_ts_age};
 
 #[derive(Clone, Copy, PartialEq)]
-enum Pane { Agents, Outputs, History, Context }
+enum Pane { Agents, Outputs, Stats, History, Context }
 
 // Clockwise: top-left → right → bottom-left → middle-left
-const PANE_ORDER: &[Pane] = &[Pane::Agents, Pane::Context, Pane::History, Pane::Outputs];
+const PANE_ORDER: &[Pane] = &[Pane::Agents, Pane::Context, Pane::History, Pane::Stats, Pane::Outputs];
 
 pub(crate) struct SubconsciousScreen {
     focus: Pane,
@@ -29,6 +29,7 @@ pub(crate) struct SubconsciousScreen {
     output_tree: SectionTree,
     context_tree: SectionTree,
     history_scroll: super::scroll_pane::ScrollPaneState,
+    stats_scroll: super::scroll_pane::ScrollPaneState,
 }
 
 impl SubconsciousScreen {
@@ -41,6 +42,7 @@ impl SubconsciousScreen {
             output_tree: SectionTree::new(),
             context_tree: SectionTree::new(),
             history_scroll: super::scroll_pane::ScrollPaneState::new(),
+            stats_scroll: super::scroll_pane::ScrollPaneState::new(),
         }
     }
 
@@ -87,6 +89,13 @@ impl ScreenView for SubconsciousScreen {
                             _ => {}
                         }
                         Pane::Outputs => self.output_tree.handle_nav(code, &output_sections, area.height),
+                        Pane::Stats => match code {
+                            KeyCode::Up => self.stats_scroll.scroll_up(3),
+                            KeyCode::Down => self.stats_scroll.scroll_down(3),
+                            KeyCode::PageUp => self.stats_scroll.scroll_up(20),
+                            KeyCode::PageDown => self.stats_scroll.scroll_down(20),
+                            _ => {}
+                        }
                         Pane::History => match code {
                             KeyCode::Up => self.history_scroll.scroll_up(3),
                             KeyCode::Down => self.history_scroll.scroll_down(3),
@@ -106,7 +115,7 @@ impl ScreenView for SubconsciousScreen {
             Constraint::Percentage(62),
         ]).areas(area);
 
-        // Left column: agent list (top) | outputs (middle) | history (bottom, main)
+        // Left column: agent list | outputs | stats | history
         let unc_count = if app.unconscious_state.is_empty() { 0 }
             else { app.unconscious_state.len() + 1 }; // +1 for separator
         let agent_count = (app.agent_state.len() + unc_count).max(1) as u16;
@@ -114,15 +123,21 @@ impl ScreenView for SubconsciousScreen {
         let output_lines = app.agent_state.get(self.selected())
             .map(|s| s.state.values().map(|v| v.lines().count() + 1).sum::<usize>())
             .unwrap_or(0);
-        let output_height = (output_lines as u16 + 2).min(left.height / 4).max(3);
-        let [list_area, output_area, history_area] = Layout::vertical([
+        let output_height = (output_lines as u16 + 2).min(left.height / 5).max(3);
+        let stats_lines = self.selected_persisted_stats(app)
+            .map(|s| s.by_tool.len())
+            .unwrap_or(0);
+        let stats_height = (stats_lines as u16 + 2).min(left.height / 5).max(3);
+        let [list_area, output_area, stats_area, history_area] = Layout::vertical([
             Constraint::Length(list_height),
             Constraint::Length(output_height),
+            Constraint::Length(stats_height),
             Constraint::Min(5),
         ]).areas(left);
 
         self.draw_list(frame, list_area, app);
         self.draw_outputs(frame, output_area, app);
+        self.draw_stats(frame, stats_area, app);
         self.draw_history(frame, history_area, app);
         self.draw_context(frame, right, &context_sections, app);
     }
@@ -147,6 +162,7 @@ impl SubconsciousScreen {
         self.output_tree = SectionTree::new();
         self.context_tree = SectionTree::new();
         self.history_scroll = super::scroll_pane::ScrollPaneState::new();
+        self.stats_scroll = super::scroll_pane::ScrollPaneState::new();
     }
 
     /// Get the agent Arc for the selected item, whether subconscious or unconscious.
@@ -175,6 +191,12 @@ impl SubconsciousScreen {
             .unwrap_or(&[])
     }
 
+    /// Get persisted stats for the selected agent.
+    fn selected_persisted_stats(&self, app: &App) -> Option<crate::agent::oneshot::PersistedStats> {
+        let name = self.selected_agent_name(app)?;
+        Some(crate::agent::oneshot::get_stats(&name))
+    }
+
     fn output_sections(&self, app: &App) -> Vec<SectionView> {
         let snap = match app.agent_state.get(self.selected()) {
             Some(s) => s,
@@ -211,37 +233,39 @@ impl SubconsciousScreen {
 
     fn draw_list(&mut self, frame: &mut Frame, area: Rect, app: &App) {
         let mut items: Vec<ListItem> = app.agent_state.iter().map(|snap| {
-            if !snap.enabled {
-                ListItem::from(Line::from(vec![
-                    Span::styled(&snap.name, Style::default().fg(Color::DarkGray)),
-                    Span::styled(" ○ off", Style::default().fg(Color::DarkGray)),
-                ]))
+            let (name_color, indicator) = if !snap.enabled {
+                (Color::DarkGray, "○")
             } else if snap.running {
-                ListItem::from(Line::from(vec![
-                    Span::styled(&snap.name, Style::default().fg(Color::Green)),
-                    Span::styled(" ● ", Style::default().fg(Color::Green)),
-                    Span::styled(
-                        format!("p:{} t:{}", snap.current_phase, snap.turn),
-                        Style::default().fg(Color::DarkGray),
-                    ),
-                ]))
+                (Color::Green, "●")
             } else {
-                let ago = snap.last_run_secs_ago
-                    .map(|s| format_age(s))
-                    .unwrap_or_else(|| "—".to_string());
-                let entries = snap.forked_agent.as_ref()
-                    .and_then(|a| a.context.try_lock().ok())
-                    .map(|ctx| ctx.conversation().len().saturating_sub(snap.fork_point))
-                    .unwrap_or(0);
-                ListItem::from(Line::from(vec![
-                    Span::styled(&snap.name, Style::default().fg(Color::Gray)),
-                    Span::styled(" ○ ", Style::default().fg(Color::DarkGray)),
-                    Span::styled(
-                        format!("{} {}e", ago, entries),
-                        Style::default().fg(Color::DarkGray),
-                    ),
-                ]))
-            }
+                (Color::Gray, "○")
+            };
+            let ago = snap.last_run_secs_ago
+                .map(|s| format_age(s))
+                .unwrap_or_else(|| "—".to_string());
+            let detail = if snap.running {
+                format!("p:{} t:{}", snap.current_phase, snap.turn)
+            } else if !snap.enabled {
+                "off".to_string()
+            } else if let Some(ref stats) = snap.last_stats {
+                let fail_str = if stats.tool_failures > 0 {
+                    format!(" {}fail", stats.tool_failures)
+                } else {
+                    String::new()
+                };
+                format!("×{} {} {}tc{} avg:{:.1}",
+                    snap.runs, ago,
+                    stats.tool_calls, fail_str,
+                    snap.tool_calls_ewma)
+            } else {
+                format!("×{} {}", snap.runs, ago)
+            };
+            ListItem::from(Line::from(vec![
+                Span::styled(&snap.name, Style::default().fg(name_color)),
+                Span::styled(format!(" {} ", indicator),
+                    Style::default().fg(if snap.running { Color::Green } else { Color::DarkGray })),
+                Span::styled(detail, Style::default().fg(Color::DarkGray)),
+            ]))
         }).collect();
 
         // Unconscious agents (graph maintenance)
@@ -266,9 +290,15 @@ impl SubconsciousScreen {
                 } else if !snap.enabled {
                     "off".to_string()
                 } else if let Some(ref stats) = snap.last_stats {
-                    format!("×{} {} {}msg {}tc",
+                    let fail_str = if stats.tool_failures > 0 {
+                        format!(" {}fail", stats.tool_failures)
+                    } else {
+                        String::new()
+                    };
+                    format!("×{} {} {}tc{} avg:{:.1}",
                         snap.runs, ago,
-                        stats.messages, stats.tool_calls)
+                        stats.tool_calls, fail_str,
+                        snap.tool_calls_ewma)
                 } else {
                     format!("×{} {}", snap.runs, ago)
                 };
@@ -316,6 +346,67 @@ impl SubconsciousScreen {
         frame.render_stateful_widget(widget, area, &mut self.output_tree.scroll);
     }
 
+    fn draw_stats(&mut self, frame: &mut Frame, area: Rect, app: &App) {
+        let dim = Style::default().fg(Color::DarkGray);
+        let header_style = Style::default().fg(Color::DarkGray);
+        let name_style = Style::default().fg(Color::Cyan);
+        let num_style = Style::default().fg(Color::Yellow);
+
+        let mut lines: Vec<Line> = Vec::new();
+
+        if let Some(stats) = self.selected_persisted_stats(app) {
+            if !stats.by_tool.is_empty() {
+                // Header
+                lines.push(Line::from(vec![
+                    Span::styled("  tool                 ", header_style),
+                    Span::styled("last  ", header_style),
+                    Span::styled(" avg  ", header_style),
+                    Span::styled("total", header_style),
+                ]));
+
+                // Sort by total descending
+                let mut tools: Vec<_> = stats.by_tool.iter().collect();
+                tools.sort_by(|a, b| b.1.total.cmp(&a.1.total));
+
+                for (name, tool_stats) in tools {
+                    let short_name = name.strip_prefix("memory_").unwrap_or(name);
+                    lines.push(Line::from(vec![
+                        Span::styled(format!("  {:<20} ", short_name), name_style),
+                        Span::styled(format!("{:>4}  ", tool_stats.last), num_style),
+                        Span::styled(format!("{:>4.1}  ", tool_stats.ewma), dim),
+                        Span::styled(format!("{:>5}", tool_stats.total), num_style),
+                    ]));
+                }
+
+                // Failures row if any
+                if stats.failures.total > 0 {
+                    lines.push(Line::raw(""));
+                    lines.push(Line::from(vec![
+                        Span::styled("  failures             ", Style::default().fg(Color::Red)),
+                        Span::styled(format!("{:>4}  ", stats.failures.last), num_style),
+                        Span::styled(format!("{:>4.1}  ", stats.failures.ewma), dim),
+                        Span::styled(format!("{:>5}", stats.failures.total), num_style),
+                    ]));
+                }
+            }
+        }
+
+        if lines.is_empty() {
+            lines.push(Line::styled("  (no tool calls)", dim));
+        }
+
+        let mut block = pane_block_focused("tool calls", self.focus == Pane::Stats);
+        if self.focus == Pane::Stats {
+            block = block.title_bottom(Line::styled(
+                " ↑↓:scroll  PgUp/Dn ",
+                Style::default().fg(Color::DarkGray),
+            ));
+        }
+        let widget = super::scroll_pane::ScrollPane::new(&lines)
+            .block(block);
+        frame.render_stateful_widget(widget, area, &mut self.stats_scroll);
+    }
+
     fn draw_history(&mut self, frame: &mut Frame, area: Rect, app: &App) {
         let dim = Style::default().fg(Color::DarkGray);
         let key_style = Style::default().fg(Color::Yellow);