chore: drop packages/dd.md

package-lock.json

@@ -80,7 +80,7 @@
         "@lydell/node-pty-win32-arm64": "1.1.0",
         "@lydell/node-pty-win32-x64": "1.1.0",
         "keytar": "^7.9.0",
-        "node-pty": "^1.0.0"
+        "node-pty": "^1.1.0"
       }
     },
     "node_modules/@agentclientprotocol/sdk": {
@@ -4906,53 +4906,6 @@
         "url": "https://opencollective.com/vitest"
       }
     },
-    "node_modules/@vscode/vsce": {
-      "version": "3.6.0",
-      "resolved": "https://registry.npmjs.org/@vscode/vsce/-/vsce-3.6.0.tgz",
-      "integrity": "sha512-u2ZoMfymRNJb14aHNawnXJtXHLXDVKc1oKZaH4VELKT/9iWKRVgtQOdwxCgtwSxJoqYvuK4hGlBWQJ05wxADhg==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@azure/identity": "^4.1.0",
-        "@secretlint/node": "^10.1.1",
-        "@secretlint/secretlint-formatter-sarif": "^10.1.1",
-        "@secretlint/secretlint-rule-no-dotenv": "^10.1.1",
-        "@secretlint/secretlint-rule-preset-recommend": "^10.1.1",
-        "@vscode/vsce-sign": "^2.0.0",
-        "azure-devops-node-api": "^12.5.0",
-        "chalk": "^4.1.2",
-        "cheerio": "^1.0.0-rc.9",
-        "cockatiel": "^3.1.2",
-        "commander": "^12.1.0",
-        "form-data": "^4.0.0",
-        "glob": "^11.0.0",
-        "hosted-git-info": "^4.0.2",
-        "jsonc-parser": "^3.2.0",
-        "leven": "^3.1.0",
-        "markdown-it": "^14.1.0",
-        "mime": "^1.3.4",
-        "minimatch": "^3.0.3",
-        "parse-semver": "^1.1.1",
-        "read": "^1.0.7",
-        "secretlint": "^10.1.1",
-        "semver": "^7.5.2",
-        "tmp": "^0.2.3",
-        "typed-rest-client": "^1.8.4",
-        "url-join": "^4.0.1",
-        "xml2js": "^0.5.0",
-        "yauzl": "^2.3.1",
-        "yazl": "^2.2.2"
-      },
-      "bin": {
-        "vsce": "vsce"
-      },
-      "engines": {
-        "node": ">= 20"
-      },
-      "optionalDependencies": {
-        "keytar": "^7.7.0"
-      }
-    },
     "node_modules/@vscode/vsce-sign": {
       "version": "2.0.6",
       "resolved": "https://registry.npmjs.org/@vscode/vsce-sign/-/vsce-sign-2.0.6.tgz",
@@ -5098,52 +5051,6 @@
         "win32"
       ]
     },
-    "node_modules/@vscode/vsce/node_modules/hosted-git-info": {
-      "version": "4.1.0",
-      "resolved": "https://registry.npmjs.org/hosted-git-info/-/hosted-git-info-4.1.0.tgz",
-      "integrity": "sha512-kyCuEOWjJqZuDbRHzL8V93NzQhwIB71oFWSyzVo+KPZI+pnQPPxucdkrOZvkLRnrf5URsQM+IJ09Dw29cRALIA==",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "lru-cache": "^6.0.0"
-      },
-      "engines": {
-        "node": ">=10"
-      }
-    },
-    "node_modules/@vscode/vsce/node_modules/lru-cache": {
-      "version": "6.0.0",
-      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-6.0.0.tgz",
-      "integrity": "sha512-Jo6dJ04CmSjuznwJSS3pUeWmd/H0ffTlkXXgwZi+eq1UCmqQwCh+eLsYOYCwY991i2Fah4h1BEMCx4qThGbsiA==",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "yallist": "^4.0.0"
-      },
-      "engines": {
-        "node": ">=10"
-      }
-    },
-    "node_modules/@vscode/vsce/node_modules/mime": {
-      "version": "1.6.0",
-      "resolved": "https://registry.npmjs.org/mime/-/mime-1.6.0.tgz",
-      "integrity": "sha512-x0Vn8spI+wuJ1O6S7gnbaQg8Pxh4NNHb7KSINmEWKiPE4RKOplvijn+NkmYmmRgP68mc70j2EbeTFRsrswaQeg==",
-      "dev": true,
-      "license": "MIT",
-      "bin": {
-        "mime": "cli.js"
-      },
-      "engines": {
-        "node": ">=4"
-      }
-    },
-    "node_modules/@vscode/vsce/node_modules/yallist": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
-      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
-      "dev": true,
-      "license": "ISC"
-    },
     "node_modules/@vue/compiler-core": {
       "version": "3.5.26",
       "resolved": "https://registry.npmjs.org/@vue/compiler-core/-/compiler-core-3.5.26.tgz",
@@ -6655,6 +6562,13 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/concat-map": {
+      "version": "0.0.1",
+      "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
+      "integrity": "sha512-/Srv4dswyQNBfohGpz9o6Yb3Gz3SrUDqBH5rTuhGR7ahtlbYKnVxw2bCFMRljaA7EXHaXZ8wsHdodFvbkhKmqg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/config-chain": {
       "version": "1.1.13",
       "resolved": "https://registry.npmjs.org/config-chain/-/config-chain-1.1.13.tgz",
@@ -12193,13 +12107,6 @@
         "node": "^18.17.0 || >=20.5.0"
       }
     },
-    "node_modules/nan": {
-      "version": "2.23.0",
-      "resolved": "https://registry.npmjs.org/nan/-/nan-2.23.0.tgz",
-      "integrity": "sha512-1UxuyYGdoQHcGg87Lkqm3FzefucTa0NAiOcuRsDmysep3c1LVCRK2krrUDafMWtjSG04htvAmvg96+SDknOmgQ==",
-      "license": "MIT",
-      "optional": true
-    },
     "node_modules/nano-spawn": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/nano-spawn/-/nano-spawn-1.0.3.tgz",
@@ -12343,16 +12250,23 @@
       }
     },
     "node_modules/node-pty": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/node-pty/-/node-pty-1.0.0.tgz",
-      "integrity": "sha512-wtBMWWS7dFZm/VgqElrTvtfMq4GzJ6+edFI0Y0zyzygUSZMgZdraDUMUhCIvkjhJjme15qWmbyJbtAx4ot4uZA==",
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/node-pty/-/node-pty-1.1.0.tgz",
+      "integrity": "sha512-20JqtutY6JPXTUnL0ij1uad7Qe1baT46lyolh2sSENDd4sTzKZ4nmAFkeAARDKwmlLjPx6XKRlwRUxwjOy+lUg==",
       "hasInstallScript": true,
       "license": "MIT",
       "optional": true,
       "dependencies": {
-        "nan": "^2.17.0"
+        "node-addon-api": "^7.1.0"
       }
     },
+    "node_modules/node-pty/node_modules/node-addon-api": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/node-addon-api/-/node-addon-api-7.1.1.tgz",
+      "integrity": "sha512-5m3bsyrjFWE1xf7nz7YXdN4udnVtXK6/Yfgn5qnahL6bCkf2yKt4k3nuTKAtT4r3IG8JNR2ncsIMdZuAzJjHQQ==",
+      "license": "MIT",
+      "optional": true
+    },
     "node_modules/node-sarif-builder": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/node-sarif-builder/-/node-sarif-builder-3.2.0.tgz",
@@ -17996,6 +17910,23 @@
         "node": ">=20"
       }
     },
+    "packages/snake-game": {
+      "name": "@google/gemini-cli-snake-game",
+      "version": "0.1.0",
+      "extraneous": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "lucide-react": "^0.471.0"
+      },
+      "devDependencies": {
+        "@types/react": "^19.2.0",
+        "@types/react-dom": "^19.2.0",
+        "esbuild": "^0.25.0",
+        "react": "^19.2.0",
+        "react-dom": "^19.2.0",
+        "typescript": "^5.7.3"
+      }
+    },
     "packages/test-utils": {
       "name": "@google/gemini-cli-test-utils",
       "version": "0.36.0-nightly.20260317.2f90b4653",
@@ -18030,7 +17961,7 @@
         "@types/vscode": "^1.99.0",
         "@typescript-eslint/eslint-plugin": "^8.31.1",
         "@typescript-eslint/parser": "^8.31.1",
-        "@vscode/vsce": "^3.6.0",
+        "@vscode/vsce": "^3.7.1",
         "esbuild": "^0.25.3",
         "eslint": "^9.25.1",
         "npm-run-all2": "^8.0.2",
@@ -18047,6 +17978,155 @@
       "integrity": "sha512-30sjmas1hQ0gVbX68LAWlm/YYlEqUErunPJJKLpEl+xhK0mKn+jyzlCOpsdTwfkZfPy4U6CDkmygBLC3AB8W9Q==",
       "dev": true,
       "license": "MIT"
+    },
+    "packages/vscode-ide-companion/node_modules/@vscode/vsce": {
+      "version": "3.7.1",
+      "resolved": "https://registry.npmjs.org/@vscode/vsce/-/vsce-3.7.1.tgz",
+      "integrity": "sha512-OTm2XdMt2YkpSn2Nx7z2EJtSuhRHsTPYsSK59hr3v8jRArK+2UEoju4Jumn1CmpgoBLGI6ReHLJ/czYltNUW3g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@azure/identity": "^4.1.0",
+        "@secretlint/node": "^10.1.2",
+        "@secretlint/secretlint-formatter-sarif": "^10.1.2",
+        "@secretlint/secretlint-rule-no-dotenv": "^10.1.2",
+        "@secretlint/secretlint-rule-preset-recommend": "^10.1.2",
+        "@vscode/vsce-sign": "^2.0.0",
+        "azure-devops-node-api": "^12.5.0",
+        "chalk": "^4.1.2",
+        "cheerio": "^1.0.0-rc.9",
+        "cockatiel": "^3.1.2",
+        "commander": "^12.1.0",
+        "form-data": "^4.0.0",
+        "glob": "^11.0.0",
+        "hosted-git-info": "^4.0.2",
+        "jsonc-parser": "^3.2.0",
+        "leven": "^3.1.0",
+        "markdown-it": "^14.1.0",
+        "mime": "^1.3.4",
+        "minimatch": "^3.0.3",
+        "parse-semver": "^1.1.1",
+        "read": "^1.0.7",
+        "secretlint": "^10.1.2",
+        "semver": "^7.5.2",
+        "tmp": "^0.2.3",
+        "typed-rest-client": "^1.8.4",
+        "url-join": "^4.0.1",
+        "xml2js": "^0.5.0",
+        "yauzl": "^2.3.1",
+        "yazl": "^2.2.2"
+      },
+      "bin": {
+        "vsce": "vsce"
+      },
+      "engines": {
+        "node": ">= 20"
+      },
+      "optionalDependencies": {
+        "keytar": "^7.7.0"
+      }
+    },
+    "packages/vscode-ide-companion/node_modules/@vscode/vsce/node_modules/minimatch": {
+      "version": "3.1.5",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.5.tgz",
+      "integrity": "sha512-VgjWUsnnT6n+NUk6eZq77zeFdpW2LWDzP6zFGrCbHXiYNul5Dzqk2HHQ5uFH2DNW5Xbp8+jVzaeNt94ssEEl4w==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "brace-expansion": "^1.1.7"
+      },
+      "engines": {
+        "node": "*"
+      }
+    },
+    "packages/vscode-ide-companion/node_modules/balanced-match": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
+      "integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "packages/vscode-ide-companion/node_modules/brace-expansion": {
+      "version": "1.1.12",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.12.tgz",
+      "integrity": "sha512-9T9UjW3r0UW5c1Q7GTwllptXwhvYmEzFhzMfZ9H7FQWt+uZePjZPjBP/W1ZEyZ1twGWom5/56TF4lPcqjnDHcg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "balanced-match": "^1.0.0",
+        "concat-map": "0.0.1"
+      }
+    },
+    "packages/vscode-ide-companion/node_modules/glob": {
+      "version": "11.1.0",
+      "resolved": "https://registry.npmjs.org/glob/-/glob-11.1.0.tgz",
+      "integrity": "sha512-vuNwKSaKiqm7g0THUBu2x7ckSs3XJLXE+2ssL7/MfTGPLLcrJQ/4Uq1CjPTtO5cCIiRxqvN6Twy1qOwhL0Xjcw==",
+      "deprecated": "Old versions of glob are not supported, and contain widely publicized security vulnerabilities, which have been fixed in the current version. Please update. Support for old versions may be purchased (at exorbitant rates) by contacting i@izs.me",
+      "dev": true,
+      "license": "BlueOak-1.0.0",
+      "dependencies": {
+        "foreground-child": "^3.3.1",
+        "jackspeak": "^4.1.1",
+        "minimatch": "^10.1.1",
+        "minipass": "^7.1.2",
+        "package-json-from-dist": "^1.0.0",
+        "path-scurry": "^2.0.0"
+      },
+      "bin": {
+        "glob": "dist/esm/bin.mjs"
+      },
+      "engines": {
+        "node": "20 || >=22"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
+    },
+    "packages/vscode-ide-companion/node_modules/hosted-git-info": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/hosted-git-info/-/hosted-git-info-4.1.0.tgz",
+      "integrity": "sha512-kyCuEOWjJqZuDbRHzL8V93NzQhwIB71oFWSyzVo+KPZI+pnQPPxucdkrOZvkLRnrf5URsQM+IJ09Dw29cRALIA==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "lru-cache": "^6.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "packages/vscode-ide-companion/node_modules/lru-cache": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-6.0.0.tgz",
+      "integrity": "sha512-Jo6dJ04CmSjuznwJSS3pUeWmd/H0ffTlkXXgwZi+eq1UCmqQwCh+eLsYOYCwY991i2Fah4h1BEMCx4qThGbsiA==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "yallist": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "packages/vscode-ide-companion/node_modules/mime": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/mime/-/mime-1.6.0.tgz",
+      "integrity": "sha512-x0Vn8spI+wuJ1O6S7gnbaQg8Pxh4NNHb7KSINmEWKiPE4RKOplvijn+NkmYmmRgP68mc70j2EbeTFRsrswaQeg==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "mime": "cli.js"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "packages/vscode-ide-companion/node_modules/yallist": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
+      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
+      "dev": true,
+      "license": "ISC"
     }
   }
 }

package.json

@@ -150,7 +150,7 @@
     "@lydell/node-pty-win32-arm64": "1.1.0",
     "@lydell/node-pty-win32-x64": "1.1.0",
     "keytar": "^7.9.0",
-    "node-pty": "^1.0.0"
+    "node-pty": "^1.1.0"
   },
   "lint-staged": {
     "*.{js,jsx,ts,tsx}": [

packages/cli/src/config/config.ts

@@ -97,6 +97,8 @@ export interface CliArgs {
   rawOutput: boolean | undefined;
   acceptRawOutputRisk: boolean | undefined;
   isCommand: boolean | undefined;
+  simulateUser: boolean | undefined;
+  knowledgeSources: string[] | undefined;
 }
 
 /**
@@ -298,6 +300,19 @@ export async function parseArguments(
         .option('accept-raw-output-risk', {
           type: 'boolean',
           description: 'Suppress the security warning when using --raw-output.',
+        })
+        .option('simulate-user', {
+          type: 'boolean',
+          description:
+            'Run the user simulation agent in the background for evaluation purposes.',
+        })
+        .option('knowledge-sources', {
+          type: 'array',
+          string: true,
+          nargs: 1,
+          description:
+            'List of files or folders to load into the user simulator context (comma-separated or multiple --knowledge-sources)',
+          coerce: coerceCommaSeparated,
         }),
     )
     // Register MCP subcommands
@@ -799,6 +814,8 @@ export async function loadCliConfig(
     approvalMode,
     disableYoloMode:
       settings.security?.disableYoloMode || settings.admin?.secureModeEnabled,
+    simulateUser: !!argv.simulateUser,
+    knowledgeSources: argv.knowledgeSources,
     disableAlwaysAllow:
       settings.security?.disableAlwaysAllow ||
       settings.admin?.secureModeEnabled,

packages/cli/src/gemini.test.tsx

@@ -513,6 +513,8 @@ describe('gemini.tsx main function kitty protocol', () => {
       rawOutput: undefined,
       acceptRawOutputRisk: undefined,
       isCommand: undefined,
+      simulateUser: undefined,
+      knowledgeSources: undefined,
     });
 
     await act(async () => {

packages/cli/src/interactiveCli.tsx

@@ -9,7 +9,15 @@ import { render } from 'ink';
 import { basename } from 'node:path';
 import { AppContainer } from './ui/AppContainer.js';
 import { ConsolePatcher } from './ui/utils/ConsolePatcher.js';
+import { UserSimulator } from './services/UserSimulator.js';
 import { registerCleanup, setupTtyCheck } from './utils/cleanup.js';
+import { PassThrough } from 'node:stream';
+
+interface RenderMetrics {
+  renderTime: number;
+  output: string;
+  staticOutput?: string;
+}
 import {
   type StartupWarning,
   type Config,
@@ -132,6 +140,11 @@ export async function startInteractiveUI(
     await new Promise((resolve) => setTimeout(resolve, 100));
   }
 
+  const simulateUser = config.getSimulateUser();
+  const simulatedStdin = new PassThrough({ encoding: 'utf8' });
+
+  let lastFrame: string | undefined;
+  const staticHistory: string[] = [];
   const instance = render(
     process.env['DEBUG'] ? (
       <React.StrictMode>
@@ -143,12 +156,20 @@ export async function startInteractiveUI(
     {
       stdout: inkStdout,
       stderr: inkStderr,
-      stdin: process.stdin,
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any, @typescript-eslint/no-unsafe-type-assertion, @typescript-eslint/no-unsafe-assignment
+      stdin: (simulateUser ? simulatedStdin : process.stdin) as any,
       exitOnCtrlC: false,
       isScreenReaderEnabled: config.getScreenReader(),
-      onRender: ({ renderTime }: { renderTime: number }) => {
-        if (renderTime > SLOW_RENDER_MS) {
-          recordSlowRender(config, renderTime);
+      onRender: (metrics: RenderMetrics) => {
+        lastFrame = metrics.output;
+        if (metrics.staticOutput) {
+          staticHistory.push(metrics.staticOutput);
+          if (staticHistory.length > 50) {
+            staticHistory.shift();
+          }
+        }
+        if (metrics.renderTime > SLOW_RENDER_MS) {
+          recordSlowRender(config, metrics.renderTime);
         }
         profiler.reportFrameRendered();
       },
@@ -179,6 +200,21 @@ export async function startInteractiveUI(
       }
     });
 
+  if (simulateUser) {
+    const simulator = new UserSimulator(
+      config,
+      () => {
+        if (lastFrame === undefined) return undefined;
+        // Combine history with latest frame for the simulator
+        const historyText = staticHistory.join('\n');
+        return historyText ? `${historyText}\n${lastFrame}` : lastFrame;
+      },
+      simulatedStdin,
+    );
+    simulator.start();
+    registerCleanup(() => simulator.stop());
+  }
+
   registerCleanup(() => instance.unmount());
 
   registerCleanup(setupTtyCheck());

packages/cli/src/services/UserSimulator.ts

@@ -0,0 +1,272 @@
+/**
+ * @license
+ * Copyright 2026 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+import type { Config } from '@google/gemini-cli-core';
+import {
+  debugLogger,
+  LlmRole,
+  PREVIEW_GEMINI_FLASH_MODEL,
+  resolveModel,
+} from '@google/gemini-cli-core';
+import type { Writable } from 'node:stream';
+import * as fs from 'node:fs';
+import * as path from 'node:path';
+
+export class UserSimulator {
+  private isRunning = false;
+  private timer: NodeJS.Timeout | null = null;
+  private lastScreenContent = '';
+  private isProcessing = false;
+  private interactionsFile: string | null = null;
+
+  private knowledgeBase = '';
+  private actionHistory: string[] = [];
+
+  constructor(
+    private readonly config: Config,
+    private readonly getScreen: () => string | undefined,
+    private readonly stdinBuffer: Writable,
+  ) {}
+
+  start() {
+    if (!this.config.getSimulateUser()) {
+      return;
+    }
+    const sources = (this.config as any).getKnowledgeSources?.() || [];
+    if (sources.length > 0) {
+      this.loadKnowledge(sources);
+    }
+    this.interactionsFile = `interactions_${Date.now()}.txt`;
+    this.isRunning = true;
+    this.timer = setInterval(() => this.tick(), 3000);
+  }
+
+  stop() {
+    this.isRunning = false;
+    if (this.timer) {
+      clearInterval(this.timer);
+      this.timer = null;
+    }
+    debugLogger.log('User simulator stopped');
+  }
+
+  private loadKnowledge(paths: string[]) {
+    const loadFromPath = (p: string) => {
+      try {
+        if (!fs.existsSync(p)) return;
+        const stats = fs.statSync(p);
+        if (stats.isFile()) {
+          const content = fs.readFileSync(p, 'utf-8');
+          this.knowledgeBase += `\nFile: ${p}\nContent:\n${content}\n---\n`;
+        } else if (stats.isDirectory()) {
+          const files = fs.readdirSync(p);
+          for (const file of files) {
+            loadFromPath(path.join(p, file));
+          }
+        }
+      } catch (e) {
+        debugLogger.error(`Failed to load knowledge from ${p}`, e);
+      }
+    };
+
+    for (const p of paths) {
+      loadFromPath(p);
+    }
+  }
+
+  private async tick() {
+    if (!this.isRunning || this.isProcessing) return;
+
+    try {
+      this.isProcessing = true;
+      const screen = this.getScreen();
+      if (!screen) return;
+
+      const strippedScreen = screen
+        .replace(
+          // eslint-disable-next-line no-control-regex
+          /[\u001b\u009b][[()#;?]*(?:[0-9]{1,4}(?:;[0-9]{0,4})*)?[0-9A-ORZcf-nqry=><]/g,
+          '',
+        )
+        .replace(/\n([ \t]*\n)+/g, '\n\n');
+
+      const normalizedScreen = strippedScreen
+        .replace(/[⠋⠙⠹⠸⠼⠴⠦⠧⠇⠏]/g, '')
+        .replace(/\[?\s*\b\d+(\.\d+)?s\b\s*\]?/g, '')
+        .trim();
+
+      if (normalizedScreen === this.lastScreenContent) return;
+
+      debugLogger.log(
+        `[SIMULATOR] Screen Content Seen:\n---\n${strippedScreen}\n---`,
+      );
+      if (this.interactionsFile) {
+        fs.appendFileSync(
+          this.interactionsFile,
+          `[LOG] [SIMULATOR] Screen Content Seen:\n---\n${strippedScreen}\n---\n\n`,
+        );
+      }
+
+      const contentGenerator = this.config.getContentGenerator();
+      if (!contentGenerator) return;
+
+      const originalGoal = this.config.getQuestion();
+      const goalInstruction = originalGoal
+        ? `\nThe original goal was: "${originalGoal}"\n`
+        : '';
+
+
+
+      const knowledgeInstruction = this.knowledgeBase
+        ? `\nUser Knowledge Base:\nUse this information to answer questions if applicable. If the answer is not here, respond as you normally would.\n${this.knowledgeBase}\n`
+        : '';
+
+      const historyInstruction = this.actionHistory.length > 0
+        ? `\nRecent Simulator Actions (last 10):\n${this.actionHistory.slice(-10).map((a, i) => `${i + 1}. ${JSON.stringify(a)}`).join('\n')}\n`
+        : '';
+
+      const prompt = `You are evaluating a CLI agent by simulating a user sitting at the terminal.
+Look carefully at the screen and determine the CLI's current state:
+
+STATE 1: The agent is busy (e.g., streaming a response, showing a spinner, running a tool, or displaying a timer like "7s"). It is actively working and NOT waiting for text input.
+- In this case, you MUST output exactly: <WAIT>
+
+STATE 2: The agent is waiting for you to authorize a tool, confirm an action, or answer a specific multi-choice question (e.g., "Action Required", "Allow execution", numbered options).
+- In this case, you MUST output the exact raw characters to select the option and submit it (e.g., 1\\r, 2\\r, y\\r, n\\r, or just \\r if the default option is acceptable). Do NOT output <DONE> or "Thank you". You must unblock the agent and allow it to run the tool.
+
+STATE 3: The agent has finished its current thought process AND is idle, waiting for a NEW general text prompt (usually indicated by a "> Type your message" prompt).
+- First, verify that the ACTUAL task is fully complete based on your original goal. Do not stop at intermediate steps like planning or syntax checking.
+- If the task is indeed fully complete, output "Thank you\\r" to graciously finish the simulation.
+- If you have already said thank you, output exactly: <DONE>
+- If the agent is waiting at a general text prompt but the original task is NOT complete, provide text instructions to continue what is missing. DO NOT repeat the original goal if it has already been provided once. Ask it to continue or provide feedback based on the current state or send <DONE> if you think the task is completed.
+
+STATE 4: Any other situation where the agent is waiting for text input or needs to press Enter.
+- Output the raw characters you would type, followed by \\r. For just an Enter key press, output \\r.
+
+CRITICAL RULES:
+- RULE 1: If there is ANY active spinner (e.g., ⠋, ⠙, ⠹, ⠸, ⠼, ⠴, ⠧) or an elapsed time indicator (e.g., "0s", "7s") anywhere on the screen, the agent is STILL WORKING. You MUST output <WAIT>. Do NOT issue commands, even if a text prompt is visible below it.
+- RULE 2: If there is an "Action Required" or confirmation prompt on the screen, YOU MUST HANDLE IT (State 2). This takes precedence over everything else.
+- RULE 3: Output ONLY the raw characters to send, <WAIT>, or <DONE>.
+- RULE 4: Do NOT output markdown, explanations of your thought process, or quotes.
+${goalInstruction}${knowledgeInstruction}${historyInstruction}
+
+Here is the current terminal screen output:
+
+<screen>
+${strippedScreen}
+</screen>`;
+
+      if (this.interactionsFile) {
+        fs.appendFileSync(
+          this.interactionsFile,
+          `[LOG] [SIMULATOR] Prompt Used:\n---\n${prompt}\n---\n\n`,
+        );
+      }
+
+      const model = resolveModel(
+        PREVIEW_GEMINI_FLASH_MODEL,
+        false, // useGemini3_1
+        false, // useCustomToolModel
+        this.config.getHasAccessToPreviewModel?.() ?? true,
+        this.config,
+      );
+
+      const response = await contentGenerator.generateContent(
+        {
+          model,
+          contents: [
+            {
+              role: 'user',
+              parts: [{ text: prompt }],
+            },
+          ],
+        },
+        'simulator-prompt',
+        LlmRole.UTILITY_SIMULATOR,
+      );
+
+      const responseText = (response.text || '').replace(
+        /^[`"']+|[`"']+$/g,
+        '',
+      );
+      const trimmedResponse = responseText.trim();
+
+      debugLogger.log(
+        `[SIMULATOR] Raw model response: ${JSON.stringify(response.text)}`,
+      );
+      if (this.interactionsFile) {
+        fs.appendFileSync(
+          this.interactionsFile,
+          `[LOG] [SIMULATOR] Raw model response: ${JSON.stringify(response.text)}\n\n`,
+        );
+      }
+      debugLogger.log(
+        `[SIMULATOR] Processed response: ${JSON.stringify(responseText)}`,
+      );
+
+      if (trimmedResponse === '<DONE>') {
+        const msg = '[SIMULATOR] Terminating simulation: Task is completed.';
+        debugLogger.log(msg);
+        if (this.interactionsFile) {
+          fs.appendFileSync(this.interactionsFile, `[LOG] ${msg}\n\n`);
+        }
+        // eslint-disable-next-line no-console
+        console.log(`\n${msg}`);
+        this.stop();
+        process.exit(0);
+      }
+
+      if (trimmedResponse === '<WAIT>') {
+        debugLogger.log(
+          '[SIMULATOR] Skipping action (model decided to <WAIT>)',
+        );
+        this.actionHistory.push('<WAIT>');
+        if (this.interactionsFile) {
+          fs.appendFileSync(
+            this.interactionsFile,
+            `[LOG] [SIMULATOR] Action History updated with: "<WAIT>"\n\n`,
+          );
+        }
+        this.lastScreenContent = normalizedScreen;
+        return;
+      }
+
+      if (responseText) {
+        const keys = responseText.replace(/\\n/g, '\r').replace(/\\r/g, '\r');
+
+        debugLogger.log(
+          `[SIMULATOR] Sending to stdin: ${JSON.stringify(keys)}`,
+        );
+
+        this.actionHistory.push(keys);
+        if (this.interactionsFile) {
+          fs.appendFileSync(
+            this.interactionsFile,
+            `[LOG] [SIMULATOR] Action History updated with: ${JSON.stringify(keys)}\n\n`,
+          );
+        }
+
+        this.stdinBuffer.write(keys);
+        this.lastScreenContent = normalizedScreen;
+      } else {
+        debugLogger.log('[SIMULATOR] Skipping (empty response)');
+        
+        this.actionHistory.push('<EMPTY>');
+        if (this.interactionsFile) {
+          fs.appendFileSync(
+            this.interactionsFile,
+            `[LOG] [SIMULATOR] Action History updated with: "<EMPTY>"\n\n`,
+          );
+        }
+        
+        this.lastScreenContent = normalizedScreen;
+      }
+    } catch (e: unknown) {
+      debugLogger.error('UserSimulator tick failed', e);
+    } finally {
+      this.isProcessing = false;
+    }
+  }
+}

packages/cli/src/test-utils/mockConfig.ts

@@ -62,6 +62,7 @@ export const createMockConfig = (overrides: Partial<Config> = {}): Config =>
     getGeminiMdFileCount: vi.fn(() => 0),
     getDeferredCommand: vi.fn(() => undefined),
     getFileSystemService: vi.fn(() => ({})),
+    getSimulateUser: vi.fn(() => false),
     clientVersion: '1.0.0',
     getModel: vi.fn().mockReturnValue('gemini-pro'),
     getWorkingDir: vi.fn().mockReturnValue('/mock/cwd'),

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

@@ -853,7 +853,7 @@ const ChoiceQuestionView: React.FC<ChoiceQuestionViewProps> = ({
     listHeight && !isAlternateBuffer
       ? question.unconstrainedHeight
         ? Math.max(1, listHeight - selectionItems.length * 2)
-        : Math.min(15, Math.max(1, listHeight - DIALOG_PADDING))
+        : Math.min(15, Math.max(1, listHeight - Math.min(selectionItems.length, 5) * 2))
       : undefined;
 
   const maxItemsToShow =

packages/cli/src/ui/components/__snapshots__/AskUserDialog.test.tsx.snap

@@ -30,6 +30,8 @@ exports[`AskUserDialog > Scroll Arrows (useAlternateBuffer: false) > shows scrol
        Description 1                                                            
    2.  Option 2
        Description 2
+   3.  Option 3
+       Description 3
 ▼
 
 Enter to select · ↑/↓ to navigate · Esc to cancel

packages/core/src/config/config.ts

@@ -649,6 +649,8 @@ export interface ConfigParameters {
   billing?: {
     overageStrategy?: OverageStrategy;
   };
+  simulateUser?: boolean;
+  knowledgeSources?: string[];
 }
 
 export class Config implements McpContext, AgentLoopContext {
@@ -866,6 +868,8 @@ export class Config implements McpContext, AgentLoopContext {
   private lastModeSwitchTime: number = performance.now();
   readonly injectionService: InjectionService;
   private approvedPlanPath: string | undefined;
+  private readonly simulateUser: boolean;
+  private readonly knowledgeSources: string[];
 
   constructor(params: ConfigParameters) {
     this._sessionId = params.sessionId;
@@ -1095,6 +1099,8 @@ export class Config implements McpContext, AgentLoopContext {
     this.fileExclusions = new FileExclusions(this);
     this.eventEmitter = params.eventEmitter;
     this.enableConseca = params.enableConseca ?? false;
+    this.simulateUser = params.simulateUser ?? false;
+    this.knowledgeSources = params.knowledgeSources ?? [];
 
     // Initialize Safety Infrastructure
     const contextBuilder = new ContextBuilder(this);
@@ -2509,6 +2515,14 @@ export class Config implements McpContext, AgentLoopContext {
     return this.usageStatisticsEnabled;
   }
 
+  getSimulateUser(): boolean {
+    return this.simulateUser;
+  }
+  
+  getKnowledgeSources(): string[] {
+    return this.knowledgeSources;
+  }
+
   getAcpMode(): boolean {
     return this.acpMode;
   }

packages/core/src/config/defaultModelConfigs.ts

@@ -277,7 +277,7 @@ export const DEFAULT_MODEL_CONFIGS: ModelConfigServiceConfig = {
       family: 'gemini-3',
       isPreview: true,
       isVisible: true,
-      features: { thinking: false, multimodalToolUse: true },
+      features: { thinking: true, multimodalToolUse: true },
     },
     'gemini-2.5-pro': {
       tier: 'pro',

packages/core/src/telemetry/llmRole.ts

@@ -16,4 +16,5 @@ export enum LlmRole {
   UTILITY_EDIT_CORRECTOR = 'utility_edit_corrector',
   UTILITY_AUTOCOMPLETE = 'utility_autocomplete',
   UTILITY_FAST_ACK_HELPER = 'utility_fast_ack_helper',
+  UTILITY_SIMULATOR = 'utility_simulator',
 }

packages/vscode-ide-companion/package.json

@@ -129,7 +129,7 @@
     "@types/vscode": "^1.99.0",
     "@typescript-eslint/eslint-plugin": "^8.31.1",
     "@typescript-eslint/parser": "^8.31.1",
-    "@vscode/vsce": "^3.6.0",
+    "@vscode/vsce": "^3.7.1",
     "esbuild": "^0.25.3",
     "eslint": "^9.25.1",
     "npm-run-all2": "^8.0.2",