Lead show moved pane despite unsent text

internal/agents/hands.go

@@ -1,6 +1,12 @@
 package agents
 
-import "g.fc.run/misc/byre/internal/mcp"
+import (
+	"os"
+	"os/exec"
+	"path/filepath"
+
+	"g.fc.run/misc/byre/internal/mcp"
+)
 
 const screenshotGuidance = "\n- When a turn changes something you can see, you can show it in your final message: save screenshots with the Playwright tools (pages you serve on this task's ports) or hands' capture with save (apps on this Mac), and embed each as a Markdown image, ![what it shows](<path>), with the path the tool returned. They go to the task's media folder, outside the worktree, so they are never committed, and are deleted when the task closes. Leave out a screenshot that adds nothing to the text."
 
@@ -8,6 +14,34 @@ func MediaDir(worktreePath string) string {
 	return worktreePath + "-media"
 }
 
-func handsMCP(mediaDir string) mcp.Stdio {
-	return mcp.Stdio{Name: "hands", Command: "byre-hands", Args: []string{"--media-dir", mediaDir}}
+func (m *Manager) handsDir(sessionID string) string {
+	return filepath.Join(m.handsRoot, sessionID)
+}
+
+// replayd keys ScreenCaptureKit clients by executable path, so two hands
+// processes run from one path keep cancelling each other's connection.
+func (m *Manager) handsMCP(sessionID, mediaDir string) (mcp.Stdio, error) {
+	src, err := exec.LookPath("byre-hands")
+	if err != nil {
+		return mcp.Stdio{}, err
+	}
+	data, err := os.ReadFile(src)
+	if err != nil {
+		return mcp.Stdio{}, err
+	}
+	dir := m.handsDir(sessionID)
+	err = os.RemoveAll(dir)
+	if err != nil {
+		return mcp.Stdio{}, err
+	}
+	err = os.MkdirAll(dir, 0o755)
+	if err != nil {
+		return mcp.Stdio{}, err
+	}
+	bin := filepath.Join(dir, "byre-hands")
+	err = os.WriteFile(bin, data, 0o755)
+	if err != nil {
+		return mcp.Stdio{}, err
+	}
+	return mcp.Stdio{Name: "hands", Command: bin, Args: []string{"--media-dir", mediaDir}}, nil
 }

internal/agents/manager.go

@@ -37,6 +37,7 @@ type Manager struct {
 	store        *store.Store
 	worktreeRoot string
 	leadRoot     string
+	handsRoot    string
 	codexHome    string
 	status       func(context.Context) (api.Status, error)
 	addProject   func(ctx context.Context, name, repoPath, createdBy string) (api.Project, error)
@@ -122,11 +123,12 @@ func (l *live) implementer() bool {
 	return l.owner == "" && l.reviewID == ""
 }
 
-func New(st *store.Store, worktreeRoot, leadRoot, codexHome string, status func(context.Context) (api.Status, error), addProject func(ctx context.Context, name, repoPath, createdBy string) (api.Project, error), clientRegistry *clients.Registry) *Manager {
+func New(st *store.Store, worktreeRoot, leadRoot, handsRoot, codexHome string, status func(context.Context) (api.Status, error), addProject func(ctx context.Context, name, repoPath, createdBy string) (api.Project, error), clientRegistry *clients.Registry) *Manager {
 	m := &Manager{
 		store:        st,
 		worktreeRoot: worktreeRoot,
 		leadRoot:     leadRoot,
+		handsRoot:    handsRoot,
 		codexHome:    codexHome,
 		status:       status,
 		addProject:   addProject,
@@ -768,7 +770,11 @@ func (m *Manager) startLive(ctx context.Context, sess api.AgentSession, task api
 			return nil, err
 		}
 		g += screenshotGuidance
-		stdio = []mcp.Stdio{handsMCP(media), playwrightMCP(media)}
+		hands, err := m.handsMCP(sess.Id, media)
+		if err != nil {
+			return nil, err
+		}
+		stdio = []mcp.Stdio{hands, playwrightMCP(media)}
 	}
 	if sess.Role == api.Reviewer {
 		r, err := m.store.ReviewBySession(ctx, sess.Id)
@@ -819,6 +825,11 @@ func (m *Manager) pump(l *live) {
 
 	l.sess.drive(m, l)
 
+	err := os.RemoveAll(m.handsDir(l.id))
+	if err != nil {
+		slog.Error("remove session's byre-hands", "session", l.id, "err", err)
+	}
+
 	m.mu.Lock()
 	delete(m.live, l.id)
 	closing := m.closing