Make compression threshold editable in the UI. (#12317)

packages/core/src/config/config.ts

@@ -92,10 +92,6 @@ export interface BugCommandSettings {
   urlTemplate: string;
 }
 
-export interface ChatCompressionSettings {
-  contextPercentageThreshold?: number;
-}
-
 export interface SummarizeToolOutputSettings {
   tokenBudget?: number;
 }
@@ -262,7 +258,7 @@ export interface ConfigParameters {
   folderTrust?: boolean;
   ideMode?: boolean;
   loadMemoryFromIncludeDirectories?: boolean;
-  chatCompression?: ChatCompressionSettings;
+  compressionThreshold?: number;
   interactive?: boolean;
   trustedFolder?: boolean;
   useRipgrep?: boolean;
@@ -359,7 +355,7 @@ export class Config {
     | undefined;
   private readonly experimentalZedIntegration: boolean = false;
   private readonly loadMemoryFromIncludeDirectories: boolean = false;
-  private readonly chatCompression: ChatCompressionSettings | undefined;
+  private readonly compressionThreshold: number | undefined;
   private readonly interactive: boolean;
   private readonly ptyInfo: string;
   private readonly trustedFolder: boolean | undefined;
@@ -462,7 +458,7 @@ export class Config {
     this.ideMode = params.ideMode ?? false;
     this.loadMemoryFromIncludeDirectories =
       params.loadMemoryFromIncludeDirectories ?? false;
-    this.chatCompression = params.chatCompression;
+    this.compressionThreshold = params.compressionThreshold;
     this.interactive = params.interactive ?? false;
     this.ptyInfo = params.ptyInfo ?? 'child_process';
     this.trustedFolder = params.trustedFolder;
@@ -1003,8 +999,8 @@ export class Config {
     this.fileSystemService = fileSystemService;
   }
 
-  getChatCompression(): ChatCompressionSettings | undefined {
-    return this.chatCompression;
+  getCompressionThreshold(): number | undefined {
+    return this.compressionThreshold;
   }
 
   isInteractiveShellEnabled(): boolean {

packages/core/src/services/chatCompressionService.test.ts

@@ -70,7 +70,7 @@ describe('findCompressSplitPoint', () => {
     expect(findCompressSplitPoint(history, 0.8)).toBe(4);
   });
 
-  it('should return earlier splitpoint if no valid ones are after threshhold', () => {
+  it('should return earlier splitpoint if no valid ones are after threshold', () => {
     const history: Content[] = [
       { role: 'user', parts: [{ text: 'This is the first message.' }] },
       { role: 'model', parts: [{ text: 'This is the second message.' }] },
@@ -115,7 +115,7 @@ describe('ChatCompressionService', () => {
       getLastPromptTokenCount: vi.fn().mockReturnValue(500),
     } as unknown as GeminiChat;
     mockConfig = {
-      getChatCompression: vi.fn(),
+      getCompressionThreshold: vi.fn(),
       getContentGenerator: vi.fn(),
     } as unknown as Config;
 

packages/core/src/services/chatCompressionService.ts

@@ -106,8 +106,7 @@ export class ChatCompressionService {
     // Don't compress if not forced and we are under the limit.
     if (!force) {
       const threshold =
-        config.getChatCompression()?.contextPercentageThreshold ??
-        DEFAULT_COMPRESSION_TOKEN_THRESHOLD;
+        config.getCompressionThreshold() ?? DEFAULT_COMPRESSION_TOKEN_THRESHOLD;
       if (originalTokenCount < threshold * tokenLimit(model)) {
         return {
           newHistory: null,