Open a yes/no prompt on its default, so Enter picks it

go.mod

@@ -11,6 +11,7 @@ require (
 	github.com/basecamp/mcp v0.0.0-20260828100356-2d6f44b51e9d
 	github.com/basecamp/surfguard/go v0.1.0
 	github.com/charmbracelet/bubbles v1.0.0
+	github.com/charmbracelet/bubbletea v1.3.10
 	github.com/charmbracelet/glamour v1.0.0
 	github.com/charmbracelet/huh v1.0.0
 	github.com/charmbracelet/x/ansi v0.11.8
@@ -44,7 +45,6 @@ require (
 	github.com/catppuccin/go v0.3.0 // indirect
 	github.com/cenkalti/backoff/v5 v5.0.3 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
-	github.com/charmbracelet/bubbletea v1.3.10 // indirect
 	github.com/charmbracelet/colorprofile v0.4.3 // indirect
 	github.com/charmbracelet/lipgloss v1.1.1-0.20250404203927-76690c660834 // indirect
 	github.com/charmbracelet/ultraviolet v0.0.0-20260811164956-006e29f97886 // indirect

internal/tui/forms.go

@@ -95,21 +95,36 @@ func runFields(fields ...huh.Field) error {
 	return runForm(huh.NewForm(huh.NewGroup(fields...)))
 }
 
-// Confirm shows a yes/no confirmation prompt. Escape or Ctrl+C cancels.
+// Confirm shows a yes/no confirmation prompt, opening on defaultValue, so
+// Enter alone answers it. Escape or Ctrl+C cancels.
+//
+// Except in huh's accessible mode (TERM=dumb), which answers end of input
+// with the prompt's default and can't tell it from Enter: there a Yes default
+// would let Ctrl+D consent, so the prompt opens on No and Yes must be typed.
 func Confirm(message string, defaultValue bool) (bool, error) {
-	var result bool
-	field := huh.NewConfirm().
-		Title(message).
-		Affirmative("Yes").
-		Negative("No").
-		Value(&result)
+	result := defaultValue && os.Getenv("TERM") != "dumb"
+	field := confirmField(message, &result)
 
-	if err := runFields(field); err != nil {
+	if err := runConfirmForm(field); err != nil {
 		return defaultValue, err
 	}
 	return result, nil
 }
 
+// runConfirmForm runs Confirm's form. A variable so a test can answer it as
+// Enter does: by submitting whatever the prompt opened on.
+var runConfirmForm = runFields
+
+// confirmField is Confirm's field. The answer highlighted when it opens is
+// whatever result holds.
+func confirmField(message string, result *bool) *huh.Confirm {
+	return huh.NewConfirm().
+		Title(message).
+		Affirmative("Yes").
+		Negative("No").
+		Value(result)
+}
+
 // ConfirmDangerous shows a confirmation prompt for dangerous actions. Escape or Ctrl+C cancels.
 func ConfirmDangerous(message string) (bool, error) {
 	var result bool

internal/tui/forms_test.go

@@ -5,11 +5,15 @@ import (
 	"go/ast"
 	"go/parser"
 	"go/token"
+	"io"
 	"os"
 	"runtime"
+	"strings"
 	"testing"
 	"time"
 
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/charmbracelet/huh"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
@@ -279,3 +283,82 @@ func TestPromptFloorCovers(t *testing.T) {
 			"forms.go exports %s but promptFloors() does not exercise its non-interactive floor", fn.Name.Name)
 	}
 }
+
+// A prompt opens on its default, so pressing Enter picks it, and an answer
+// typed against the default wins. It used to open on No whatever the default,
+// and a guided setup that asked "Work in all of your agent's projects?"
+// (default Yes) ended with none chosen. The answers go through the field's own
+// input handling, so the prompt must be bound to what Confirm returns.
+func TestConfirmAnsweredWithEnterIsItsDefault(t *testing.T) {
+	t.Setenv("TERM", "xterm-256color")
+	for _, tc := range []struct {
+		def   bool
+		typed string
+		want  bool
+	}{
+		{def: true, typed: "\n", want: true},
+		{def: false, typed: "\n", want: false},
+		{def: true, typed: "n\n", want: false},
+		{def: false, typed: "y\n", want: true},
+	} {
+		answerConfirmWith(t, tc.typed)
+		got, err := Confirm("Go ahead?", tc.def)
+		require.NoError(t, err)
+		assert.Equal(t, tc.want, got, "default %v, typed %q", tc.def, tc.typed)
+	}
+}
+
+// Accessible mode answers end of input with the default, so Ctrl+D must not
+// consent to a question that defaults to Yes.
+func TestConfirmInAccessibleModeNeverTakesYesFromEndOfInput(t *testing.T) {
+	t.Setenv("TERM", "dumb")
+	answerConfirmWith(t, "") // end of input, no answer
+
+	got, err := Confirm("Set up Basecamp for your coding agents?", true)
+	require.NoError(t, err)
+	assert.False(t, got)
+}
+
+// answerConfirmWith makes Confirm's form read typed from its field's own
+// accessible input handling, as a person at a dumb terminal would type it.
+func answerConfirmWith(t *testing.T, typed string) {
+	t.Helper()
+	prev := runConfirmForm
+	t.Cleanup(func() { runConfirmForm = prev })
+	runConfirmForm = func(fields ...huh.Field) error {
+		require.Len(t, fields, 1)
+		return fields[0].(*huh.Confirm).RunAccessible(io.Discard, strings.NewReader(typed))
+	}
+}
+
+// The interactive prompt, key by key: Enter submits whatever the prompt
+// opened on, y and n answer, and the arrows toggle. These are huh's key
+// bindings, as runForm sets them, working on Confirm's own field.
+func TestConfirmFieldAnswersFromTheKeyboard(t *testing.T) {
+	t.Setenv("TERM", "xterm-256color")
+	enter := tea.KeyMsg{Type: tea.KeyEnter}
+	for _, tc := range []struct {
+		def  bool
+		keys []tea.KeyMsg
+		want bool
+	}{
+		{def: true, keys: []tea.KeyMsg{enter}, want: true},
+		{def: false, keys: []tea.KeyMsg{enter}, want: false},
+		{def: true, keys: []tea.KeyMsg{{Type: tea.KeyRunes, Runes: []rune("n")}}, want: false},
+		{def: false, keys: []tea.KeyMsg{{Type: tea.KeyRunes, Runes: []rune("y")}}, want: true},
+		{def: true, keys: []tea.KeyMsg{{Type: tea.KeyLeft}, enter}, want: false},
+	} {
+		result := tc.def
+		field := confirmField("Go ahead?", &result)
+		field.WithKeyMap(escKeyMap()) // the key map runForm gives every form
+		field.Focus()
+		var last tea.Cmd
+		for _, k := range tc.keys {
+			_, last = field.Update(k)
+		}
+		assert.Equal(t, tc.want, result, "default %v, keys %v", tc.def, tc.keys)
+		// Every sequence ends on a key that answers, so the prompt moves on.
+		require.NotNil(t, last, "keys %v", tc.keys)
+		assert.Equal(t, huh.NextField(), last(), "keys %v", tc.keys)
+	}
+}