diff --git a/bin/board b/bin/board
index 68d4b68..d02b200 100755
--- a/bin/board
+++ b/bin/board
@@ -35,16 +35,16 @@ def parse(argv):
     return opts
 
 
-def pages(cfg):
+def pages(cfg, folder):
     """The pages, in the order they must appear on the workspace rail."""
     bin_path = BIN
     proj = cfg["paperclip"]["project"]
     task = pj.watch_task(cfg)
     return task, [
         ("shell", "shell", "exec zsh -i"),
-        ("tree", "tree", "%s -screen tree -project %s" % (shlex.quote(bin_path), proj)),
+        ("board", "board", "%s -screen board -project %s -folder %s" % (shlex.quote(bin_path), proj, shlex.quote(folder))),
+        ("work", "work", "%s -screen work -folder %s" % (shlex.quote(bin_path), shlex.quote(folder))),
         ("reply", "reply", "%s -screen reply -issue %s" % (shlex.quote(bin_path), task)),
-        ("log", "log", "%s -screen log -issue %s" % (shlex.quote(bin_path), task)),
         ("new", "new", "%s -screen new -project %s" % (shlex.quote(bin_path), proj)),
     ]
 
@@ -61,7 +61,7 @@ def main():
     if not os.path.isfile(BIN):
         raise h.Refused(2, "no harness binary at %s; build it with 'cd tui && go build -o ../bin/harness .'" % BIN)
 
-    task, page_list = pages(cfg)
+    task, page_list = pages(cfg, folder)
     h.say("board: %s  (session %s, folder %s)" % (cfg["paperclip"]["project"], session, folder))
     h.say("watching: %s" % task)
 
diff --git a/bin/harness b/bin/harness
index 02985cd..17f0f29 100755
Binary files a/bin/harness and b/bin/harness differ
diff --git a/tui/board.go b/tui/board.go
index cf71b5c..05cd9c7 100644
--- a/tui/board.go
+++ b/tui/board.go
@@ -130,13 +130,13 @@ func (m boardModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		case "r":
 			m.loading = true
 			return m, m.reload()
-		case "up":
+		case "up", "k":
 			if m.cursor > 0 {
 				m.cursor--
 				return m, m.loadDetail(m.selectedID())
 			}
 			return m, nil
-		case "down":
+		case "down", "j":
 			if m.cursor < len(m.rows)-1 {
 				m.cursor++
 				return m, m.loadDetail(m.selectedID())
@@ -166,12 +166,12 @@ func (m boardModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 				m.notice = "showing " + r.Issue.Identifier + " in every workspace"
 			}
 			return m, nil
-		case "[":
+		case "[", "h":
 			if m.focus == focusNeeds && m.needsTab > 0 {
 				m.needsTab--
 			}
 			return m, nil
-		case "]":
+		case "]", "l":
 			if m.focus == focusNeeds && m.needsTab < 1 {
 				m.needsTab++
 			}
@@ -230,12 +230,36 @@ func (m boardModel) View() string {
 	footer := m.footerLine()
 	bodyHeight := m.height - 2
 
+	// Three ways to use the same width, chosen by what the terminal actually
+	// has. Wide screens get the three panels side by side; narrow ones stack.
+	if m.width >= 140 {
+		treeW := max(34, m.width*30/100)
+		sumW := max(38, m.width*38/100)
+		needsW := max(30, m.width-treeW-sumW-2)
+
+		left := panel{title: "tasks", width: treeW, height: bodyHeight, focused: m.focus == focusTree}
+		mid := panel{title: "the chosen task", width: sumW, height: bodyHeight, focused: m.focus == focusSummary}
+		rightP := panel{
+			title: "needs you", width: needsW, height: bodyHeight,
+			tabs: []string{"decisions", "activity"}, active: m.needsTab, focused: m.focus == focusNeeds,
+		}
+		body := m.needsLines(needsW-3, bodyHeight-3)
+		if m.needsTab == 1 {
+			body = m.activityLines(needsW-3, bodyHeight-3)
+		}
+		page := lipgloss.JoinHorizontal(lipgloss.Top,
+			left.render(m.treeLines(treeW-3)), " ",
+			mid.render(m.summaryLines(sumW-3)), " ",
+			rightP.render(body))
+		return strings.Join([]string{header, page, footer}, "\n")
+	}
+
 	leftWidth := max(34, m.width*40/100)
 	rightWidth := max(30, m.width-leftWidth-1)
 
 	// Left: the task tree.
 	tree := panel{title: "tasks", width: leftWidth, height: bodyHeight, focused: m.focus == focusTree}
-	treeLines := m.treeLines(leftWidth - 2)
+	treeLines := m.treeLines(leftWidth - 3)
 	left := tree.render(treeLines)
 
 	// Right, upper: the summary of the chosen task.
@@ -247,13 +271,13 @@ func (m boardModel) View() string {
 		title: "needs you", width: rightWidth, height: needsHeight,
 		tabs: []string{"decisions", "activity"}, active: m.needsTab, focused: m.focus == focusNeeds,
 	}
-	needsBody := m.needsLines(rightWidth-2, needsHeight-2)
+	needsBody := m.needsLines(rightWidth-3, needsHeight-3)
 	if m.needsTab == 1 {
-		needsBody = m.activityLines(rightWidth-2, needsHeight-2)
+		needsBody = m.activityLines(rightWidth-3, needsHeight-3)
 	}
 
 	right := lipgloss.JoinVertical(lipgloss.Left,
-		sum.render(m.summaryLines(rightWidth-2)),
+		sum.render(m.summaryLines(rightWidth-3)),
 		needs.render(needsBody),
 	)
 
@@ -286,7 +310,7 @@ func (m boardModel) footerLine() string {
 	switch m.focus {
 	case focusTree:
 		return hintLine([]string{
-			keyHint("↑↓", "choose a task"),
+			keyHint("↑↓ or j k", "choose a task"),
 			keyHint("enter", "show it everywhere"),
 			keyHint("a", "assign"),
 			keyHint("tab", "next panel"),
@@ -295,7 +319,7 @@ func (m boardModel) footerLine() string {
 		}, m.width)
 	case focusSummary:
 		return hintLine([]string{
-			keyHint("↑↓", "choose a task"),
+			keyHint("↑↓ or j k", "choose a task"),
 			keyHint("tab", "next panel"),
 			keyHint("r", "read again"),
 			keyHint("q", "leave"),
@@ -328,7 +352,7 @@ func (m boardModel) treeLines(width int) []string {
 		if len(group) == 0 {
 			continue
 		}
-		out = append(out, groupHeading(fmt.Sprintf("%s  %d", strings.ToUpper(g), len(group))))
+		out = append(out, groupHeading(g, len(group), width))
 		for _, r := range group {
 			out = append(out, m.taskLine(r, index, width)...)
 			index++
@@ -338,8 +362,13 @@ func (m boardModel) treeLines(width int) []string {
 	return out
 }
 
-func groupHeading(s string) string {
-	return lipgloss.NewStyle().Bold(true).Foreground(lipgloss.Color(active.Mauve)).Render(s)
+// groupHeading is a label, a rule, and how many tasks are under it. The rule
+// makes the groups visible at a glance without a box around every one.
+func groupHeading(name string, count, width int) string {
+	label := lipgloss.NewStyle().Bold(true).Foreground(lipgloss.Color(active.Mauve)).Render(strings.ToUpper(name))
+	n := lipgloss.NewStyle().Foreground(lipgloss.Color(active.Muted)).Render(fmt.Sprintf(" %d ", count))
+	rule := strings.Repeat("─", max(0, width-lipgloss.Width(label)-lipgloss.Width(n)))
+	return label + dimStyle().Render(rule) + n
 }
 
 func (m boardModel) taskLine(r Row, index, width int) []string {
diff --git a/tui/frame.go b/tui/frame.go
index 3178519..45eb12a 100644
--- a/tui/frame.go
+++ b/tui/frame.go
@@ -79,7 +79,8 @@ func (p panel) render(lines []string) string {
 	top := border.Render("╭─") + panelTitleStyle().Render(title) + tabs +
 		border.Render(strings.Repeat("─", fill)) + right + border.Render("╮")
 
-	// Body: every line exactly the inner width, no exceptions.
+	// Body: every line exactly the inner width, no exceptions. Content is
+	// inset by one column so text never touches the border.
 	out := make([]string, 0, p.height)
 	out = append(out, top)
 	side := border.Render("│")
@@ -88,7 +89,7 @@ func (p panel) render(lines []string) string {
 		if i < len(lines) {
 			line = lines[i]
 		}
-		out = append(out, side+padTo(line, bw)+side)
+		out = append(out, side+" "+padTo(line, bw-1)+side)
 	}
 	out = append(out, border.Render("╰"+strings.Repeat("─", p.width-2)+"╯"))
 	return strings.Join(out, "\n")
diff --git a/tui/logdiff.go b/tui/logdiff.go
index 70684d8..8e5bdd4 100644
--- a/tui/logdiff.go
+++ b/tui/logdiff.go
@@ -10,6 +10,7 @@ package main
 import (
 	"context"
 	"fmt"
+	"os"
 	"os/exec"
 	"strings"
 	"time"
@@ -77,6 +78,9 @@ func worktreeDiff(dir, base string) (string, error) {
 	if base == "" {
 		base = "main"
 	}
+	if st, err := os.Stat(dir); err != nil || !st.IsDir() {
+		return "", fmt.Errorf("the task's folder %s no longer exists, so there is nothing to compare", dir)
+	}
 	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
 	defer cancel()
 
diff --git a/tui/main.go b/tui/main.go
index 452f391..67bffe9 100644
--- a/tui/main.go
+++ b/tui/main.go
@@ -19,7 +19,7 @@ import (
 const defaultAgent = "403de1f7-645c-4d35-bc7e-19b01d77bacc"
 
 func main() {
-	screen := flag.String("screen", "board", "which screen to run: board, tree, reply, new or log")
+	screen := flag.String("screen", "board", "which screen to run: board, work, tree, reply, new or log")
 	folder := flag.String("folder", "", "project folder, for the board screen (defaults to the current directory)")
 	light := flag.String("theme", "", "colour variant: dark, light, or empty to follow the terminal")
 	agent := flag.String("agent", defaultAgent, "agent id to assign to, default Builder")
@@ -52,6 +52,17 @@ func main() {
 		}
 		m = newBoardModel(client, proj, dir)
 
+	case "work":
+		dir := *folder
+		if dir == "" {
+			dir, _ = os.Getwd()
+		}
+		issue := *issue
+		if issue == "" {
+			issue = watchedTask(dir)
+		}
+		m = newWorkModel(client, dir, issue)
+
 	case "tree":
 		proj, err := client.ResolveProject(*project)
 		if err != nil {
diff --git a/tui/work.go b/tui/work.go
new file mode 100644
index 0000000..3105347
--- /dev/null
+++ b/tui/work.go
@@ -0,0 +1,351 @@
+package main
+
+// The Work workspace: what the chosen task is doing, and what it changed.
+//
+// One panel with three tabs, because the three things are read one at a time:
+// the runs, the change, and the facts about the copy of the code the task is
+// working in. The change is read with git in the task's own worktree, in a
+// command, never while drawing.
+
+import (
+	"fmt"
+	"os"
+	"strings"
+	"time"
+
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/charmbracelet/lipgloss"
+
+	"paperclip-harness/tui/paperclip"
+)
+
+type workMsg struct {
+	task     paperclip.Issue
+	runs     []paperclip.Run
+	activity []paperclip.Activity
+	cost     paperclip.Cost
+	diff     string
+	diffErr  error
+}
+
+type workModel struct {
+	client   *paperclip.Client
+	folder   string
+	issue    string
+	explicit bool // the task was named on the command line, so do not follow the file
+
+	task     paperclip.Issue
+	runs     []paperclip.Run
+	activity []paperclip.Activity
+	cost     paperclip.Cost
+	diff     string
+	diffErr  error
+	err      error
+
+	tab    int
+	scroll int
+	readAt time.Time
+
+	width, height int
+}
+
+var workTabs = []string{"runs", "change", "facts"}
+
+func newWorkModel(c *paperclip.Client, folder, issueID string) workModel {
+	return workModel{client: c, folder: folder, issue: issueID, explicit: issueID != ""}
+}
+
+func (m workModel) Init() tea.Cmd {
+	return tea.Batch(m.load(), tickEvery(5*time.Second))
+}
+
+func (m workModel) load() tea.Cmd {
+	c, folder := m.client, m.folder
+	fixed, explicit := m.issue, m.explicit
+	return func() tea.Msg {
+		// Unless a task was named on the command line, follow the choice made
+		// on the Board: it is written in the project's own file, so this panel
+		// needs no message from any other program.
+		id := fixed
+		if !explicit {
+			id = watchedTask(folder)
+		}
+		if id == "" {
+			return errMsg{fmt.Errorf("no task chosen: pick one on the Board, then press Enter")}
+		}
+		task, err := c.Issue(id)
+		if err != nil {
+			return errMsg{err}
+		}
+		runs, _ := c.Runs(id)
+		act, _ := c.Activity(id)
+		cost, _ := c.CostSummary(id)
+		msg := workMsg{task: task, runs: runs, activity: act, cost: cost}
+		if ws := task.Workspace; ws != nil && ws.CWD != "" {
+			msg.diff, msg.diffErr = worktreeDiff(ws.CWD, ws.BaseRef)
+		} else {
+			msg.diffErr = fmt.Errorf("this task has no worktree on this machine, so there is nothing to compare")
+		}
+		return msg
+	}
+}
+
+// watchedTask reads the chosen task from the project's own harness file.
+func watchedTask(folder string) string {
+	b, err := os.ReadFile(projectFilePath(folder))
+	if err != nil {
+		return ""
+	}
+	for _, line := range strings.Split(string(b), "\n") {
+		line = strings.TrimSpace(line)
+		if strings.HasPrefix(line, "watching") {
+			parts := strings.SplitN(line, "=", 2)
+			if len(parts) == 2 {
+				return strings.Trim(strings.TrimSpace(parts[1]), `"`)
+			}
+		}
+	}
+	return ""
+}
+
+func projectFilePath(folder string) string {
+	return folder + "/.harness/harness.toml"
+}
+
+func (m workModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
+	switch msg := msg.(type) {
+	case tea.WindowSizeMsg:
+		m.width, m.height = msg.Width, msg.Height
+		return m, nil
+
+	case tickMsg:
+		return m, tea.Batch(m.load(), tickEvery(5*time.Second))
+
+	case tea.KeyMsg:
+		switch msg.String() {
+		case "q", "ctrl+c":
+			return m, tea.Quit
+		case "r":
+			return m, m.load()
+		case "[", "h":
+			if m.tab > 0 {
+				m.tab--
+				m.scroll = 0
+			}
+			return m, nil
+		case "]", "l", "tab":
+			if m.tab < len(workTabs)-1 {
+				m.tab++
+				m.scroll = 0
+			}
+			return m, nil
+		case "up", "k":
+			m.scroll--
+			return m, nil
+		case "down", "j":
+			m.scroll++
+			return m, nil
+		case "g":
+			m.scroll = 0
+			return m, nil
+		case "G":
+			m.scroll = 1 << 30
+			return m, nil
+		case "esc":
+			return m, nil
+		}
+
+	case workMsg:
+		m.task = msg.task
+		m.runs = msg.runs
+		m.activity = msg.activity
+		m.cost = msg.cost
+		m.diff = msg.diff
+		m.diffErr = msg.diffErr
+		m.err = nil
+		m.readAt = time.Now()
+		return m, nil
+
+	case errMsg:
+		m.err = msg.err
+		return m, nil
+	}
+	return m, nil
+}
+
+func (m workModel) View() string {
+	if m.width == 0 || m.height == 0 {
+		return "reading…"
+	}
+	if m.width < 80 || m.height < 24 {
+		return lipgloss.NewStyle().Width(m.width).Height(m.height).Render(
+			fmt.Sprintf("This workspace needs 80 × 24.\nThis panel is %d × %d.", m.width, m.height))
+	}
+
+	head := titleStyle.Render("Work") + mutedStyle2().Render("  ·  ")
+	if m.task.Identifier != "" {
+		head += lipgloss.NewStyle().Foreground(lipgloss.Color(active.Text)).Render(m.task.Identifier)
+		head += mutedStyle2().Render("  " + truncateVisible(m.task.Title, max(10, m.width-50)))
+	}
+	state := "read " + m.readAt.Format("15:04:05")
+	if m.readAt.IsZero() {
+		state = "reading…"
+	}
+	gap := max(2, m.width-lipgloss.Width(head)-lipgloss.Width(state)-1)
+
+	var body []string
+	switch m.tab {
+	case 0:
+		body = m.runsLines(m.width - 4)
+	case 1:
+		body = m.diffLines(m.width - 4)
+	default:
+		body = m.factsLines(m.width - 4)
+	}
+
+	p := panel{
+		title: "the work", width: m.width, height: m.height - 2,
+		tabs: workTabs, active: m.tab, focused: true,
+	}
+
+	// Scroll inside the panel.
+	visible := p.bodyHeight()
+	maxScroll := max(0, len(body)-visible)
+	if m.scroll > maxScroll {
+		m.scroll = maxScroll
+	}
+	if m.scroll < 0 {
+		m.scroll = 0
+	}
+	from := m.scroll
+	to := min(len(body), from+visible)
+
+	footer := hintLine([]string{
+		keyHint("[ ]", "switch tab"),
+		keyHint("↑↓ or j k", "scroll"),
+		keyHint("r", "read again"),
+		keyHint("q", "leave"),
+	}, m.width)
+
+	return strings.Join([]string{
+		head + strings.Repeat(" ", gap) + mutedStyle2().Render(state),
+		p.render(body[from:to]),
+		footer,
+	}, "\n")
+}
+
+func (m workModel) runsLines(width int) []string {
+	if m.err != nil {
+		return []string{lipgloss.NewStyle().Foreground(lipgloss.Color(active.Error)).Render("error: " + m.err.Error())}
+	}
+	var out []string
+	out = append(out, "")
+	if len(m.runs) == 0 {
+		out = append(out, mutedStyle2().Render("this task has never run"))
+	} else {
+		out = append(out, dimStyle().Render(fmt.Sprintf("%-18s %-12s %-10s %-10s %s",
+			"state", "woken by", "started", "ended", "took")))
+		for _, r := range m.runs {
+			started, took := "-", "-"
+			if t, err := time.Parse(time.RFC3339, r.StartedAt); err == nil {
+				started = t.Local().Format("15:04:05")
+			}
+			if r.FinishedAt != "" {
+				if s, err := time.Parse(time.RFC3339, r.StartedAt); err == nil {
+					if f, err := time.Parse(time.RFC3339, r.FinishedAt); err == nil {
+						took = f.Sub(s).Round(time.Second).String()
+					}
+				}
+			}
+			ended := "-"
+			if t, err := time.Parse(time.RFC3339, r.FinishedAt); err == nil {
+				ended = t.Local().Format("15:04:05")
+			}
+			colour := active.Text
+			switch r.Status {
+			case "running":
+				colour = active.Info
+			case "succeeded":
+				colour = active.Success
+			case "failed":
+				colour = active.Error
+			}
+			// Pad the plain text first, then colour it: styling first would
+			// make the escape codes count as characters and break the columns.
+			out = append(out, fmt.Sprintf("%-18s %-12s %-10s %-10s %s",
+				lipgloss.NewStyle().Foreground(lipgloss.Color(colour)).Render(fmt.Sprintf("%-18s", r.Status)),
+				fmt.Sprintf("%-12s", r.Source), started, ended, took))
+		}
+	}
+	out = append(out, "")
+	out = append(out, groupHeading("activity", len(m.activity), width))
+	for i, a := range m.activity {
+		if i >= 20 {
+			out = append(out, dimStyle().Render(fmt.Sprintf("… %d more", len(m.activity)-20)))
+			break
+		}
+		when := a.CreatedAt
+		if t, err := time.Parse(time.RFC3339, a.CreatedAt); err == nil {
+			when = t.Local().Format("15:04")
+		}
+		who := a.ActorType
+		if who == "user" {
+			who = "you"
+		}
+		out = append(out, fmt.Sprintf("%s  %-7s %s", dimStyle().Render(when), mutedStyle2().Render(who),
+			lipgloss.NewStyle().Foreground(lipgloss.Color(active.Text)).Render(a.Action)))
+	}
+	return out
+}
+
+func (m workModel) diffLines(width int) []string {
+	if m.diffErr != nil {
+		return []string{"", mutedStyle2().Render(m.diffErr.Error())}
+	}
+	if m.diff == "" {
+		return []string{"", mutedStyle2().Render("nothing to compare yet")}
+	}
+	var out []string
+	for _, ln := range strings.Split(strings.TrimRight(m.diff, "\n"), "\n") {
+		style := lipgloss.NewStyle().Foreground(lipgloss.Color(active.Text))
+		switch {
+		case strings.HasPrefix(ln, "+++"), strings.HasPrefix(ln, "---"):
+			style = lipgloss.NewStyle().Foreground(lipgloss.Color(active.Muted))
+		case strings.HasPrefix(ln, "+"):
+			style = lipgloss.NewStyle().Foreground(lipgloss.Color(active.Success))
+		case strings.HasPrefix(ln, "-"):
+			style = lipgloss.NewStyle().Foreground(lipgloss.Color(active.Error))
+		case strings.HasPrefix(ln, "@@"):
+			style = lipgloss.NewStyle().Foreground(lipgloss.Color(active.Info))
+		case strings.HasPrefix(ln, "diff "), strings.HasPrefix(ln, "commit "), strings.HasPrefix(ln, "+"):
+			style = lipgloss.NewStyle().Bold(true).Foreground(lipgloss.Color(active.Text))
+		}
+		if lipgloss.Width(ln) > width {
+			ln = truncateVisible(ln, width)
+		}
+		out = append(out, style.Render(ln))
+	}
+	return out
+}
+
+func (m workModel) factsLines(width int) []string {
+	var out []string
+	out = append(out, "")
+	row := func(label, value string) {
+		out = append(out, mutedStyle2().Render(fmt.Sprintf("%-14s", label))+
+			lipgloss.NewStyle().Foreground(lipgloss.Color(active.Text)).Render(value))
+	}
+	if m.task.Identifier != "" {
+		row("task", m.task.Identifier+"  "+m.task.Title)
+		row("status", m.task.Status)
+	}
+	if m.task.Workspace != nil {
+		row("worktree", m.task.Workspace.CWD)
+		row("branch", m.task.Workspace.Branch)
+		row("cut from", m.task.Workspace.BaseRef)
+	} else {
+		row("worktree", "none: this task has no copy of the code yet")
+	}
+	row("cost", fmt.Sprintf("%d cent(s), %d run(s), %d tokens out", m.cost.CostCents, m.cost.RunCount, m.cost.OutputTokens))
+	return out
+}