Show reactions to threads

README.md

@@ -6,8 +6,8 @@ review state, merge conflicts and affected files, checks, people, labels,
 milestone, activity, change statistics, thread totals, submitted reviews, and
 the PR conversation. Review threads and comments are paginated rather than
 silently stopping at the first page. The
-thread viewer includes highlighted diff hunks and comment authors. Resolved
-threads start folded. GitHub suggestion blocks are shown as
+thread viewer includes highlighted diff hunks, comment authors, and read-only
+reaction counts on individual comments. Resolved threads start folded. GitHub suggestion blocks are shown as
 syntax-highlighted remove/add previews. Comments and PR descriptions render
 GitHub Flavored Markdown, including quoted replies, inline and fenced code,
 lists and tasks, links, tables, emphasis, strikethrough, emoji, and GitHub

github.go

@@ -153,6 +153,10 @@ query ReviewThreadsPage($owner: String!, $name: String!, $number: Int!, $after:
               line startLine originalLine originalStartLine
               originalCommit { oid }
               author { login }
+              reactionGroups {
+                content viewerHasReacted
+                reactors { totalCount }
+              }
             }
           }
         }
@@ -172,6 +176,10 @@ query ReviewCommentsPage($id: ID!, $after: String) {
           line startLine originalLine originalStartLine
           originalCommit { oid }
           author { login }
+          reactionGroups {
+            content viewerHasReacted
+            reactors { totalCount }
+          }
         }
       }
     }
@@ -374,6 +382,10 @@ query PullRequestDetails($owner: String!, $name: String!, $number: Int!) {
               line startLine originalLine originalStartLine
               originalCommit { oid }
               author { login }
+              reactionGroups {
+                content viewerHasReacted
+                reactors { totalCount }
+              }
             }
           }
         }
@@ -484,6 +496,15 @@ type githubReviewComment struct {
 	OriginalCommit                  *struct{ OID string }
 	CreatedAt                       time.Time
 	Author                          *githubActor
+	ReactionGroups                  []githubReactionGroup
+}
+
+type githubReactionGroup struct {
+	Content          string
+	ViewerHasReacted bool
+	Reactors         struct {
+		TotalCount int
+	}
 }
 
 type githubReviewCommentConnection struct {
@@ -1196,13 +1217,22 @@ func convertReviewThread(thread githubReviewThread) ReviewThread {
 }
 
 func convertReviewComment(comment githubReviewComment) ReviewComment {
-	return ReviewComment{
+	item := ReviewComment{
 		ID: comment.ID, Author: actorLogin(comment.Author), Body: comment.Body,
 		DiffHunk: comment.DiffHunk, CreatedAt: comment.CreatedAt, URL: comment.URL,
 		Line: intValue(comment.Line), StartLine: intValue(comment.StartLine),
 		OriginalLine: intValue(comment.OriginalLine), OriginalStartLine: intValue(comment.OriginalStartLine),
 		OriginalCommitOID: commitOID(comment.OriginalCommit), Outdated: comment.Outdated,
 	}
+	for _, group := range comment.ReactionGroups {
+		if group.Reactors.TotalCount > 0 {
+			item.Reactions = append(item.Reactions, ReactionSummary{
+				Content: group.Content, Count: group.Reactors.TotalCount,
+				ViewerHasReacted: group.ViewerHasReacted,
+			})
+		}
+	}
+	return item
 }
 
 func actorLogin(actor *githubActor) string {

github_test.go

@@ -338,7 +338,12 @@ func TestGetPullRequestUsesOriginalLineAndMetadata(t *testing.T) {
 					"id":"c","body":"change this","diffHunk":"@@ -1 +1 @@","createdAt":"2026-01-01T00:00:00Z",
 					"url":"cu","author":{"login":"reviewer"},"outdated":true,
 					"line":100,"startLine":99,"originalLine":42,"originalStartLine":40,
-					"originalCommit":{"oid":"0123456789abcdef"}
+					"originalCommit":{"oid":"0123456789abcdef"},
+					"reactionGroups":[
+						{"content":"THUMBS_UP","viewerHasReacted":true,"reactors":{"totalCount":3}},
+						{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":1}},
+						{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0}}
+					]
 				}]}
 			}]}
 		}}}}`))
@@ -375,6 +380,11 @@ func TestGetPullRequestUsesOriginalLineAndMetadata(t *testing.T) {
 		comment.OriginalCommitOID != "0123456789abcdef" || !comment.Outdated {
 		t.Fatalf("unexpected comment snapshot: %#v", comment)
 	}
+	if len(comment.Reactions) != 2 ||
+		comment.Reactions[0] != (ReactionSummary{Content: "THUMBS_UP", Count: 3, ViewerHasReacted: true}) ||
+		comment.Reactions[1] != (ReactionSummary{Content: "EYES", Count: 1}) {
+		t.Fatalf("unexpected comment reactions: %#v", comment.Reactions)
+	}
 }
 
 func TestGetPullRequestLoadsConflictFilesForConflictingPR(t *testing.T) {

tui.go

@@ -2089,6 +2089,14 @@ func (m App) detailLines(width int) []detailLine {
 					)...)
 				}
 			}
+			for reactionIndex, reactionLine := range renderReactionSummary(
+				comment.Reactions, max(1, width-4),
+			) {
+				lines = append(lines, detailLine{
+					rail: rail, text: reactionLine,
+					anchor: fmt.Sprintf("comment:%s:reactions:%d", comment.ID, reactionIndex),
+				})
+			}
 		}
 		if thread.IsTruncated {
 			lines = append(lines, detailLine{}, detailLine{text: warnStyle.Render("Showing the first 100 comments in this thread.")})
@@ -2100,6 +2108,67 @@ func (m App) detailLines(width int) []detailLine {
 	return lines
 }
 
+func renderReactionSummary(reactions []ReactionSummary, width int) []string {
+	var badges []string
+	for _, reaction := range reactions {
+		if reaction.Count <= 0 {
+			continue
+		}
+		badge := fmt.Sprintf("%s %d", reactionEmoji(reaction.Content), reaction.Count)
+		if reaction.ViewerHasReacted {
+			badge = titleStyle.Render(badge)
+		} else {
+			badge = dimStyle.Render(badge)
+		}
+		badges = append(badges, badge)
+	}
+	if len(badges) == 0 {
+		return nil
+	}
+
+	lines := []string{}
+	current := ""
+	for _, badge := range badges {
+		candidate := badge
+		if current != "" {
+			candidate = current + "  " + badge
+		}
+		if current != "" && ansi.StringWidth(candidate) > width {
+			lines = append(lines, current)
+			current = badge
+		} else {
+			current = candidate
+		}
+	}
+	if current != "" {
+		lines = append(lines, current)
+	}
+	return lines
+}
+
+func reactionEmoji(content string) string {
+	switch content {
+	case "THUMBS_UP":
+		return "👍"
+	case "THUMBS_DOWN":
+		return "👎"
+	case "LAUGH":
+		return "😄"
+	case "HOORAY":
+		return "🎉"
+	case "CONFUSED":
+		return "😕"
+	case "HEART":
+		return "❤️"
+	case "ROCKET":
+		return "🚀"
+	case "EYES":
+		return "👀"
+	default:
+		return ":" + strings.ToLower(content) + ":"
+	}
+}
+
 func (m App) inlineReplyLines(width int) []detailLine {
 	rail := warnStyle.Render("│ ")
 	lines := []detailLine{

tui_test.go

@@ -926,6 +926,61 @@ func TestReviewAnchorUsesCommentSnapshotCoordinates(t *testing.T) {
 	}
 }
 
+func TestThreadDetailShowsCommentReactions(t *testing.T) {
+	m := NewApp(nil, "o", "r", false, 50, 10*time.Second)
+	m.width = 80
+	m.details = PRDetails{Threads: []ReviewThread{{
+		ID: "thread", Path: "main.go", Comments: []ReviewComment{{
+			ID: "comment", Author: "reviewer", Body: "Please change this.",
+			Reactions: []ReactionSummary{
+				{Content: "THUMBS_UP", Count: 3, ViewerHasReacted: true},
+				{Content: "EYES", Count: 1},
+				{Content: "HEART", Count: 2},
+			},
+		}},
+	}}}
+
+	var rendered strings.Builder
+	reactionLines := 0
+	for _, line := range m.detailLines(50) {
+		rendered.WriteString(ansi.Strip(line.rail + line.text))
+		rendered.WriteByte('\n')
+		if strings.Contains(line.anchor, ":reactions:") {
+			reactionLines++
+			if ansi.StringWidth(line.text) > 46 {
+				t.Fatalf("reaction line exceeds detail width: %q", ansi.Strip(line.text))
+			}
+		}
+	}
+	plain := rendered.String()
+	for _, wanted := range []string{"Please change this.", "👍 3", "👀 1", "❤️ 2"} {
+		if !strings.Contains(plain, wanted) {
+			t.Fatalf("thread detail is missing %q:\n%s", wanted, plain)
+		}
+	}
+	if reactionLines == 0 {
+		t.Fatalf("reactions were not attached to their comment:\n%s", plain)
+	}
+}
+
+func TestReactionSummaryWrapsBetweenBadges(t *testing.T) {
+	reactions := []ReactionSummary{
+		{Content: "THUMBS_UP", Count: 10},
+		{Content: "THUMBS_DOWN", Count: 2},
+		{Content: "LAUGH", Count: 4},
+		{Content: "HOORAY", Count: 7},
+	}
+	lines := renderReactionSummary(reactions, 12)
+	if len(lines) < 2 {
+		t.Fatalf("reaction badges did not wrap: %#v", lines)
+	}
+	for _, line := range lines {
+		if width := ansi.StringWidth(line); width > 12 {
+			t.Fatalf("reaction line width = %d: %q", width, ansi.Strip(line))
+		}
+	}
+}
+
 func TestOutdatedDetailHighlightsOriginalCodeRange(t *testing.T) {
 	m := NewApp(nil, "o", "r", false, 50, 10*time.Second)
 	m.width = 100

types.go

@@ -174,4 +174,11 @@ type ReviewComment struct {
 	Outdated          bool
 	CreatedAt         time.Time
 	URL               string
+	Reactions         []ReactionSummary
+}
+
+type ReactionSummary struct {
+	Content          string
+	Count            int
+	ViewerHasReacted bool
 }