diff --git a/desktop/wire.go b/desktop/wire.go
index 95db13670..bf2fffcaa 100644
--- a/desktop/wire.go
+++ b/desktop/wire.go
@@ -55,16 +55,17 @@ type wireAsk struct {
 }
 
 type wireTool struct {
-	ID        string       `json:"id,omitempty"`
-	Name      string       `json:"name"`
-	Args      string       `json:"args,omitempty"`
-	Output    string       `json:"output,omitempty"`
-	Err       string       `json:"err,omitempty"`
-	ReadOnly  bool         `json:"readOnly"`
-	Truncated bool         `json:"truncated,omitempty"`
-	Partial   bool         `json:"partial,omitempty"`
-	ParentID  string       `json:"parentId,omitempty"`
-	Profile   *wireProfile `json:"profile,omitempty"`
+	ID         string       `json:"id,omitempty"`
+	Name       string       `json:"name"`
+	Args       string       `json:"args,omitempty"`
+	Output     string       `json:"output,omitempty"`
+	Err        string       `json:"err,omitempty"`
+	ReadOnly   bool         `json:"readOnly"`
+	Truncated  bool         `json:"truncated,omitempty"`
+	DurationMs int64        `json:"durationMs,omitempty"`
+	Partial    bool         `json:"partial,omitempty"`
+	ParentID   string       `json:"parentId,omitempty"`
+	Profile    *wireProfile `json:"profile,omitempty"`
 }
 
 type wireProfile struct {
@@ -157,7 +158,8 @@ func toWire(e event.Event) wireEvent {
 			ID: e.Tool.ID, Name: e.Tool.Name, Args: e.Tool.Args,
 			Output: e.Tool.Output, Err: e.Tool.Err,
 			ReadOnly: e.Tool.ReadOnly, Truncated: e.Tool.Truncated,
-			Partial: e.Tool.Partial, ParentID: e.Tool.ParentID,
+			DurationMs: e.Tool.DurationMs, Partial: e.Tool.Partial,
+			ParentID: e.Tool.ParentID,
 		}
 		if e.Tool.Profile != nil {
 			wt.Profile = &wireProfile{Model: e.Tool.Profile.Model, Effort: e.Tool.Profile.Effort}
diff --git a/desktop/wire_test.go b/desktop/wire_test.go
index 4ac2e8ef8..c63df32ee 100644
--- a/desktop/wire_test.go
+++ b/desktop/wire_test.go
@@ -79,9 +79,9 @@ func TestToWireToolDispatchProfile(t *testing.T) {
 }
 
 func TestToWireToolResult(t *testing.T) {
-	e := event.Event{Kind: event.ToolResult, Tool: event.Tool{ID: "1", Output: "ok", Truncated: true}}
+	e := event.Event{Kind: event.ToolResult, Tool: event.Tool{ID: "1", Output: "ok", Truncated: true, DurationMs: 522}}
 	w := toWire(e)
-	if w.Tool == nil || w.Tool.Output != "ok" || !w.Tool.Truncated {
+	if w.Tool == nil || w.Tool.Output != "ok" || !w.Tool.Truncated || w.Tool.DurationMs != 522 {
 		t.Errorf("tool result = %+v", w.Tool)
 	}
 }
diff --git a/internal/agent/agent.go b/internal/agent/agent.go
index 7d4941eee..6d13cfd45 100644
--- a/internal/agent/agent.go
+++ b/internal/agent/agent.go
@@ -8,6 +8,7 @@ import (
 	"strings"
 	"sync"
 	"sync/atomic"
+	"time"
 	"unicode/utf8"
 
 	"reasonix/internal/diff"
@@ -729,8 +730,11 @@ func (a *Agent) executeBatch(ctx context.Context, calls []provider.ToolCall) []s
 
 	results := make([]string, len(calls))
 	outcomes := make([]toolOutcome, len(calls))
+	durations := make([]int64, len(calls))
 	run := func(i int) {
+		start := time.Now()
 		outcomes[i] = a.executeOne(ctx, calls[i])
+		durations[i] = time.Since(start).Milliseconds()
 		results[i] = outcomes[i].output
 	}
 
@@ -748,13 +752,14 @@ func (a *Agent) executeBatch(ctx context.Context, calls []provider.ToolCall) []s
 		o := outcomes[i]
 		t, ok := a.tools.Get(c.Name)
 		a.sink.Emit(event.Event{Kind: event.ToolResult, Tool: event.Tool{
-			ID:        c.ID,
-			Name:      c.Name,
-			Args:      c.Arguments,
-			Output:    o.output,
-			Err:       o.errMsg,
-			ReadOnly:  ok && t.ReadOnly(),
-			Truncated: o.truncated,
+			ID:         c.ID,
+			Name:       c.Name,
+			Args:       c.Arguments,
+			Output:     o.output,
+			Err:        o.errMsg,
+			ReadOnly:   ok && t.ReadOnly(),
+			Truncated:  o.truncated,
+			DurationMs: durations[i],
 		}})
 		if o.truncated && o.truncMsg != "" {
 			a.sink.Emit(event.Event{Kind: event.Notice, Level: event.LevelInfo, Text: o.truncMsg})
diff --git a/internal/control/controller.go b/internal/control/controller.go
index 04bf36e8b..0b2723d81 100644
--- a/internal/control/controller.go
+++ b/internal/control/controller.go
@@ -624,26 +624,28 @@ func (c *Controller) RunShell(command string) {
 		}})
 		cmd.Stdout = w
 		cmd.Stderr = w
+		start := time.Now()
 		err := cmd.Run()
+		durationMs := time.Since(start).Milliseconds()
 		out := buf.String()
 
 		if ctx.Err() == context.DeadlineExceeded {
 			c.sink.Emit(event.Event{
 				Kind: event.ToolResult,
-				Tool: event.Tool{ID: id, Name: "bash", Output: out, Err: fmt.Sprintf(i18n.M.ShellExecTimeoutFmt, shellTimeout)},
+				Tool: event.Tool{ID: id, Name: "bash", Output: out, Err: fmt.Sprintf(i18n.M.ShellExecTimeoutFmt, shellTimeout), DurationMs: durationMs},
 			})
 			return nil
 		}
 		if err != nil {
 			c.sink.Emit(event.Event{
 				Kind: event.ToolResult,
-				Tool: event.Tool{ID: id, Name: "bash", Output: out, Err: fmt.Sprintf(i18n.M.ShellExecFailedFmt, err)},
+				Tool: event.Tool{ID: id, Name: "bash", Output: out, Err: fmt.Sprintf(i18n.M.ShellExecFailedFmt, err), DurationMs: durationMs},
 			})
 			return nil
 		}
 		c.sink.Emit(event.Event{
 			Kind: event.ToolResult,
-			Tool: event.Tool{ID: id, Name: "bash", Output: out},
+			Tool: event.Tool{ID: id, Name: "bash", Output: out, DurationMs: durationMs},
 		})
 		return nil
 	})
diff --git a/internal/event/event.go b/internal/event/event.go
index 5a8b3c7ee..fbcbf17e4 100644
--- a/internal/event/event.go
+++ b/internal/event/event.go
@@ -103,13 +103,14 @@ type Profile struct {
 // only ID/Name/Args/ReadOnly are set; on result Output/Err/Truncated are filled
 // in. Args is the raw JSON arguments — a sink compacts it for display.
 type Tool struct {
-	ID        string
-	Name      string
-	Args      string
-	Output    string // ToolResult: the result text fed to the model
-	Err       string // ToolResult: non-empty when the call failed or was blocked
-	ReadOnly  bool
-	Truncated bool // ToolResult: Output was head+tailed before display/model
+	ID         string
+	Name       string
+	Args       string
+	Output     string // ToolResult: the result text fed to the model
+	Err        string // ToolResult: non-empty when the call failed or was blocked
+	ReadOnly   bool
+	Truncated  bool  // ToolResult: Output was head+tailed before display/model
+	DurationMs int64 // ToolResult: wall-clock execution time in milliseconds
 	// Partial marks an early ToolDispatch emitted when a call begins (ID/Name set,
 	// Args still streaming) so a frontend can show the card immediately; a second,
 	// full ToolDispatch (Partial false, Args set) follows when the call completes.
diff --git a/internal/serve/wire.go b/internal/serve/wire.go
index 07462cb6f..566192ff3 100644
--- a/internal/serve/wire.go
+++ b/internal/serve/wire.go
@@ -54,16 +54,17 @@ type wireProfile struct {
 }
 
 type wireTool struct {
-	ID        string       `json:"id,omitempty"`
-	Name      string       `json:"name"`
-	Args      string       `json:"args,omitempty"`
-	Output    string       `json:"output,omitempty"`
-	Err       string       `json:"err,omitempty"`
-	ReadOnly  bool         `json:"readOnly"`
-	Truncated bool         `json:"truncated,omitempty"`
-	Partial   bool         `json:"partial,omitempty"`
-	ParentID  string       `json:"parentId,omitempty"`
-	Profile   *wireProfile `json:"profile,omitempty"`
+	ID         string       `json:"id,omitempty"`
+	Name       string       `json:"name"`
+	Args       string       `json:"args,omitempty"`
+	Output     string       `json:"output,omitempty"`
+	Err        string       `json:"err,omitempty"`
+	ReadOnly   bool         `json:"readOnly"`
+	Truncated  bool         `json:"truncated,omitempty"`
+	DurationMs int64        `json:"durationMs,omitempty"`
+	Partial    bool         `json:"partial,omitempty"`
+	ParentID   string       `json:"parentId,omitempty"`
+	Profile    *wireProfile `json:"profile,omitempty"`
 }
 
 type wireUsage struct {
@@ -150,7 +151,8 @@ func toWire(e event.Event) wireEvent {
 			ID: e.Tool.ID, Name: e.Tool.Name, Args: e.Tool.Args,
 			Output: e.Tool.Output, Err: e.Tool.Err,
 			ReadOnly: e.Tool.ReadOnly, Truncated: e.Tool.Truncated,
-			Partial: e.Tool.Partial, ParentID: e.Tool.ParentID,
+			DurationMs: e.Tool.DurationMs, Partial: e.Tool.Partial,
+			ParentID: e.Tool.ParentID,
 		}
 		if e.Tool.Profile != nil {
 			wt.Profile = &wireProfile{Model: e.Tool.Profile.Model, Effort: e.Tool.Profile.Effort}
diff --git a/internal/serve/wire_test.go b/internal/serve/wire_test.go
index 722bd4c6f..9ad7f8799 100644
--- a/internal/serve/wire_test.go
+++ b/internal/serve/wire_test.go
@@ -26,6 +26,13 @@ func TestToWire(t *testing.T) {
 		}
 	})
 
+	t.Run("tool result duration", func(t *testing.T) {
+		w := toWire(event.Event{Kind: event.ToolResult, Tool: event.Tool{Name: "web_fetch", Output: "ok", DurationMs: 522}})
+		if w.Tool == nil || w.Tool.Output != "ok" || w.Tool.DurationMs != 522 {
+			t.Errorf("tool result duration = %+v", w.Tool)
+		}
+	})
+
 	t.Run("usage with cost", func(t *testing.T) {
 		w := toWire(event.Event{
 			Kind:    event.Usage,