fix(cli,core): address PR feedback regarding text-buffer bounds and recentActivity leak

packages/cli/src/ui/components/AnsiOutput.tsx

@@ -35,16 +35,17 @@ export const AnsiOutputText: React.FC<AnsiOutputProps> = ({
       ? Math.min(availableHeightLimit, maxLines)
       : (availableHeightLimit ?? maxLines ?? DEFAULT_HEIGHT);
 
+  const MAXIMUM_ANSI_LINES_RENDERED = 1000;
   const lastLines = Array.isArray(data)
     ? disableTruncation
-      ? data
+      ? data.slice(-MAXIMUM_ANSI_LINES_RENDERED)
       : numLinesRetained === 0
         ? []
         : data.slice(-numLinesRetained)
     : [];
   return (
     <Box flexDirection="column" width={width} flexShrink={0} overflow="hidden">
-      {(lastLines as AnsiLine[]).map((line: AnsiLine, lineIndex: number) => (
+      {lastLines.map((line: AnsiLine, lineIndex: number) => (
         <Box key={lineIndex} height={1} overflow="hidden">
           <AnsiLineText line={line} />
         </Box>

packages/cli/src/ui/components/messages/SubagentProgressDisplay.tsx

@@ -86,8 +86,9 @@ export const SubagentProgressDisplay: React.FC<
         </Box>
       )}
       <Box flexDirection="column" marginLeft={0} gap={0}>
-        {(historyOverrides ?? progress.recentActivity).map(
-          (item: SubagentActivityItem) => {
+        {(historyOverrides ?? progress.recentActivity)
+          .slice(-100)
+          .map((item: SubagentActivityItem) => {
             if (item.type === 'thought') {
               const isCancellation = item.content === 'Request cancelled.';
               const icon = isCancellation ? 'ℹ ' : '💭';
@@ -155,8 +156,7 @@ export const SubagentProgressDisplay: React.FC<
               );
             }
             return null;
-          },
-        )}
+          })}
       </Box>
 
       {progress.result && (

packages/cli/src/ui/components/shared/text-buffer.ts

@@ -2779,7 +2779,41 @@ export function textBufferReducer(
   action: TextBufferAction,
   options: TextBufferOptions = {},
 ): TextBufferState {
-  const newState = textBufferReducerLogic(state, action, options);
+  let newState = textBufferReducerLogic(state, action, options);
+
+  const MAX_TEXT_BUFFER_LINES = 10000;
+  if (newState.lines.length > MAX_TEXT_BUFFER_LINES) {
+    const excess = newState.lines.length - MAX_TEXT_BUFFER_LINES;
+    const newLines = newState.lines.slice(excess);
+    const newCursorRow = Math.max(0, newState.cursorRow - excess);
+    let newExpandedPaste = newState.expandedPaste;
+    if (newExpandedPaste) {
+      const newStartLine = newExpandedPaste.startLine - excess;
+      if (newStartLine < 0) {
+        newExpandedPaste = null;
+      } else {
+        newExpandedPaste = { ...newExpandedPaste, startLine: newStartLine };
+      }
+    }
+    let newSelectionAnchor = newState.selectionAnchor;
+    if (newSelectionAnchor) {
+      const newAnchorRow = newSelectionAnchor[0] - excess;
+      if (newAnchorRow < 0) {
+        newSelectionAnchor = null;
+      } else {
+        newSelectionAnchor = [newAnchorRow, newSelectionAnchor[1]];
+      }
+    }
+    newState = {
+      ...newState,
+      lines: newLines,
+      cursorRow: newCursorRow,
+      expandedPaste: newExpandedPaste,
+      selectionAnchor: newSelectionAnchor,
+      undoStack: [],
+      redoStack: [],
+    };
+  }
 
   const newTransformedLines =
     newState.lines !== state.lines

packages/core/src/agents/local-invocation.ts

@@ -262,6 +262,13 @@ export class LocalSubagentInvocation extends BaseToolInvocation<
         }
 
         if (updated) {
+          const MAX_RECENT_ACTIVITY = 100;
+          if (recentActivity.length > MAX_RECENT_ACTIVITY) {
+            recentActivity.splice(
+              0,
+              recentActivity.length - MAX_RECENT_ACTIVITY,
+            );
+          }
           const progress: SubagentProgress = {
             isSubagentProgress: true,
             agentName: this.definition.name,

packages/test-utils/package.json

@@ -7,7 +7,8 @@
   "type": "module",
   "scripts": {
     "build": "node ../../scripts/build_package.js",
-    "typecheck": "tsc --noEmit"
+    "typecheck": "tsc --noEmit",
+    "test:ci": "echo 'no tests'"
   },
   "dependencies": {
     "@google/gemini-cli-core": "file:../core",