feat: open the original chat from a pull request

client/board/board-body.tsx

@@ -9,6 +9,7 @@ import { ProjectsView } from "../projects/projects-view";
 import { EMPTY_PROMPTS, PromptSettingsView } from "../settings/prompt-settings-view";
 import type { Styles } from "../theme/use-styles";
 import { openExternalUrl } from "../web";
+import type { ChatLink } from "./use-chat-links";
 
 /**
  * Everything below the header and the toolbar: the settings screen when it is
@@ -37,6 +38,7 @@ export function BoardBody({
   setBodyWidth,
   detailTarget,
   detailItem,
+  detailChatLink,
   detailProgress,
   closeDetails,
   savedFraction,
@@ -63,6 +65,7 @@ export function BoardBody({
   setBodyWidth: (next: number | null) => void;
   detailTarget: { item: BoardItem; type: ColumnId } | null;
   detailItem: BoardItem | null;
+  detailChatLink: ChatLink | null;
   detailProgress: Animated.Value;
   closeDetails: () => void;
   savedFraction: number | null;
@@ -141,6 +144,7 @@ export function BoardBody({
           key={detailItem.id}
           item={detailItem}
           type={detailTarget.type}
+          chatLink={detailChatLink}
           styles={styles}
           accentColor={surfaceProps.theme.colors.accent}
           foregroundColor={surfaceProps.theme.colors.foreground}
@@ -149,6 +153,7 @@ export function BoardBody({
           onWidthCommitted={commitWidth}
           progress={detailProgress}
           onClose={closeDetails}
+          onOpenChat={(chat) => surfaceProps.navigation?.openAgent({ agentId: chat.agentId })}
           onSend={openSendDialog}
           onMerged={dropItem}
         />

client/board/board-row.styles.ts

@@ -68,6 +68,7 @@ export function buildBoardRowStyles(
       gap: 6,
       marginTop: 6,
     },
+    itemRowActions: { flexDirection: "row" as const, alignItems: "center" as const, gap: 4 },
     /** Hidden until the row or the action itself is hovered; see `sendButtonHidden`. */
     itemRowActionHidden: { opacity: 0 },
     label: {

client/board/github-board.tsx

@@ -51,6 +51,7 @@ export function GitHubBoard(props: PluginSurfaceProps) {
     setBodyWidth,
     detailTarget,
     detailItem,
+    detailChatLink,
     detailProgress,
     closeDetails,
     savedFraction,
@@ -154,6 +155,7 @@ export function GitHubBoard(props: PluginSurfaceProps) {
         setBodyWidth={setBodyWidth}
         detailTarget={detailTarget}
         detailItem={detailItem}
+        detailChatLink={detailChatLink}
         detailProgress={detailProgress}
         closeDetails={closeDetails}
         savedFraction={savedFraction}

client/board/item-row.tsx

@@ -8,6 +8,7 @@ import { linkedIssueLabel } from "../lib/formatting";
 import { relativeTime } from "../lib/time";
 import type { SortOrder } from "../lib/sort";
 import type { Styles } from "../theme/use-styles";
+import type { ChatLink } from "./use-chat-links";
 import { describeRow } from "./item-row-format";
 import { ItemRowTrailing } from "./item-row-trailing";
 
@@ -59,7 +60,9 @@ export const ItemRow = memo(function ItemRow({
   selected,
   accentColor,
   mutedColor,
+  chatLink,
   onOpen,
+  onOpenChat,
   onSend,
   onLabels,
   type,
@@ -83,8 +86,11 @@ export const ItemRow = memo(function ItemRow({
   accentColor: string;
   /** The state glyph's colour for a draft or a discussion, and the send icon's. */
   mutedColor: string;
+  /** The first Paseo chat associated with this pull request's workspace. */
+  chatLink: ChatLink | null;
   /** A press: opens the row in the detail panel, never the browser. */
   onOpen: (item: BoardItem, type: ColumnId) => void;
+  onOpenChat: (chat: ChatLink) => void;
   onSend: (item: BoardItem, type: ColumnId) => void;
   /** Null where labels cannot be edited, which takes the gesture away entirely. */
   onLabels: ((item: BoardItem, point: { x: number; y: number }) => void) | null;
@@ -120,6 +126,10 @@ export const ItemRow = memo(function ItemRow({
     onSend(item, type);
   }, [item, onSend, type]);
 
+  const openChat = useCallback(() => {
+    if (chatLink !== null) onOpenChat(chatLink);
+  }, [chatLink, onOpenChat]);
+
   const openLabels = useCallback(
     (event: unknown) => {
       const point = pointerPoint(event);
@@ -200,20 +210,38 @@ export const ItemRow = memo(function ItemRow({
         {compact ? <View style={styles.itemRowTrailingCompact}>{trailing}</View> : null}
       </View>
       {compact ? null : <View style={styles.itemRowTrailing}>{trailing}</View>}
-      <Pressable
-        accessibilityRole="button"
-        accessibilityLabel={`Send ${item.repository} #${item.number} to a new workspace chat`}
-        onPress={send}
-        onHoverIn={() => setActionHovered(true)}
-        onHoverOut={() => setActionHovered(false)}
-        style={({ pressed }) => [
-          styles.iconButton,
-          revealed ? null : styles.itemRowActionHidden,
-          pressed ? styles.cardPressed : null,
-        ]}
-      >
-        <Icon name="Send" size={14} color={mutedColor} />
-      </Pressable>
+      <View style={styles.itemRowActions}>
+        {chatLink === null ? null : (
+          <Pressable
+            accessibilityRole="button"
+            accessibilityLabel={`Open original chat ${chatLink.agentTitle}`}
+            onPress={openChat}
+            onHoverIn={() => setActionHovered(true)}
+            onHoverOut={() => setActionHovered(false)}
+            style={({ pressed }) => [
+              styles.iconButton,
+              revealed ? null : styles.itemRowActionHidden,
+              pressed ? styles.cardPressed : null,
+            ]}
+          >
+            <Icon name="MessageSquare" size={14} color={mutedColor} />
+          </Pressable>
+        )}
+        <Pressable
+          accessibilityRole="button"
+          accessibilityLabel={`Send ${item.repository} #${item.number} to a new workspace chat`}
+          onPress={send}
+          onHoverIn={() => setActionHovered(true)}
+          onHoverOut={() => setActionHovered(false)}
+          style={({ pressed }) => [
+            styles.iconButton,
+            revealed ? null : styles.itemRowActionHidden,
+            pressed ? styles.cardPressed : null,
+          ]}
+        >
+          <Icon name="Send" size={14} color={mutedColor} />
+        </Pressable>
+      </View>
     </Pressable>
   );
 });

client/board/use-board-overlays.tsx

@@ -10,6 +10,7 @@ import type { BoardRow, SortOrder } from "../lib/sort";
 import { DETAIL_CLOSE_MS, DETAIL_OPEN_MS } from "../detail/constants";
 import { ItemRow } from "./item-row";
 import type { Styles } from "../theme/use-styles";
+import type { ChatLink } from "./use-chat-links";
 import { LABEL_MENU_MAX_HEIGHT, LABEL_MENU_WIDTH, MENU_MARGIN } from "./label-menu";
 import type { LabelMenuTarget } from "./label-menu";
 
@@ -23,6 +24,7 @@ export interface UseBoardOverlaysInputs {
   mutateBoardCache: (updater: (current: Board) => Board) => void;
   /** The active sort's row label and date accessor, for `ItemRow`'s meta line. */
   activeOrder: SortOrder;
+  chatLinkForItem: (item: BoardItem) => ChatLink | null;
 }
 
 /** What `useBoardOverlays` exposes to the surface. */
@@ -31,6 +33,7 @@ export interface UseBoardOverlaysResult {
   setBodyWidth: (next: number | null) => void;
   detailTarget: { item: BoardItem; type: ColumnId } | null;
   detailItem: BoardItem | null;
+  detailChatLink: ChatLink | null;
   detailProgress: Animated.Value;
   closeDetails: () => void;
   openSendDialog: (item: BoardItem, type: ColumnId) => void;
@@ -58,7 +61,7 @@ export interface UseBoardOverlaysResult {
 export function useBoardOverlays(
   props: PluginSurfaceProps,
   styles: Styles,
-  { board, promptValues, mutateBoardCache, activeOrder }: UseBoardOverlaysInputs,
+  { board, promptValues, mutateBoardCache, activeOrder, chatLinkForItem }: UseBoardOverlaysInputs,
 ): UseBoardOverlaysResult {
   const toast = useToast();
 
@@ -200,6 +203,14 @@ export function useBoardOverlays(
   }, [board, detailTarget]);
 
   const selectedId = detailItem?.id ?? null;
+  const detailChatLink = detailItem === null ? null : chatLinkForItem(detailItem);
+
+  const openChat = useCallback(
+    (chat: ChatLink) => {
+      props.navigation?.openAgent({ agentId: chat.agentId });
+    },
+    [props.navigation],
+  );
 
   /**
    * Opens the launch dialog on this card, with the card's template already
@@ -256,7 +267,9 @@ export function useBoardOverlays(
         selected={row.item.id === selectedId}
         accentColor={props.theme.colors.accent}
         mutedColor={props.theme.colors.foregroundMuted}
+        chatLink={chatLinkForItem(row.item)}
         onOpen={openDetails}
+        onOpenChat={openChat}
         onSend={openSendDialog}
         onLabels={row.type === "discussions" ? null : openLabelMenu}
         type={row.type}
@@ -271,7 +284,9 @@ export function useBoardOverlays(
       selectedId,
       props.theme.colors.accent,
       props.theme.colors.foregroundMuted,
+      chatLinkForItem,
       openDetails,
+      openChat,
       openSendDialog,
       openLabelMenu,
       activeOrder,
@@ -283,6 +298,7 @@ export function useBoardOverlays(
     setBodyWidth,
     detailTarget,
     detailItem,
+    detailChatLink,
     detailProgress,
     closeDetails,
     openSendDialog,

client/board/use-chat-links.test.ts

@@ -0,0 +1,58 @@
+import { describe, expect, it } from "vitest";
+import { buildChatLinks, chatLinkFor } from "./use-chat-links";
+
+describe("buildChatLinks", () => {
+  it("links a pull request to the first chat in its workspace", () => {
+    const links = buildChatLinks(
+      [
+        {
+          id: "workspace-1",
+          name: "Fix dashboard",
+          githubRuntime: {
+            pullRequest: { url: "https://ghe.example.com/an-org/example/pull/42" },
+          },
+        },
+      ],
+      [
+        {
+          agent: {
+            id: "follow-up",
+            title: "Review",
+            workspaceId: "workspace-1",
+            createdAt: "2026-09-16T12:00:00Z",
+          },
+        },
+        {
+          agent: {
+            id: "original",
+            title: "Implement",
+            workspaceId: "workspace-1",
+            createdAt: "2026-09-15T12:00:00Z",
+          },
+        },
+      ],
+    );
+
+    expect(chatLinkFor(links, "https://ghe.example.com/an-org/example/pull/42/")).toEqual({
+      agentId: "original",
+      agentTitle: "Implement",
+      workspaceId: "workspace-1",
+      workspaceName: "Fix dashboard",
+    });
+  });
+
+  it("does not link a workspace with no chat", () => {
+    const links = buildChatLinks(
+      [
+        {
+          id: "workspace-1",
+          name: "No agent",
+          githubRuntime: { pullRequest: { url: "https://github.com/an-owner/example/pull/1" } },
+        },
+      ],
+      [],
+    );
+
+    expect(links.size).toBe(0);
+  });
+});