Windows: animated CLI pets show flashing blocks in Windows Terminal and WezTerm

What version of Codex CLI is running?

codex-cli 0.154.0

What subscription do you have?

Plus

Which model were you using?

gpt-6-astra

What platform is your computer?

Microsoft Windows NT 10.0.26200.0 x64

What terminal emulator and version are you using (if applicable)?

Reproduced using native Windows PowerShell in both: - Windows Terminal 1.24.11911.0 - WezTerm nightly 20260911-023905-2b56c468 WezTerm has enable_kitty_graphics = true, confirmed through window:effective_config().

Codex doctor report

{
  "schemaVersion": 1,
  "generatedAt": "1789135852s since unix epoch",
  "overallStatus": "ok",
  "codexVersion": "0.154.0",
  "checks": {
    "app_server.status": {
      "id": "app_server.status",
      "category": "app-server",
      "status": "ok",
      "summary": "background server is not running",
      "details": {
        "control socket": "C:\\Users\\Administrator\\.codex\\app-server-control\\app-server-control.sock",
        "daemon state dir": "C:\\Users\\Administrator\\.codex\\app-server-daemon",
        "mode": "ephemeral",
        "pid file": "C:\\Users\\Administrator\\.codex\\app-server-daemon\\app-server.pid (missing)",
        "settings": "C:\\Users\\Administrator\\.codex\\app-server-daemon\\settings.json (missing)",
        "status": "not running",
        "update-loop pid file": "C:\\Users\\Administrator\\.codex\\app-server-daemon\\app-server-updater.pid (missing)"
      },
      "remediation": null,
      "durationMs": 0
    },
    "auth.credentials": {
      "id": "auth.credentials",
      "category": "auth",
      "status": "ok",
      "summary": "auth is configured",
      "details": {
        "auth file": "C:\\Users\\Administrator\\.codex\\auth.json",
        "auth storage mode": "File",
        "stored API key": "false",
        "stored ChatGPT tokens": "true",
        "stored agent identity": "false",
        "stored auth mode": "chatgpt"
      },
      "remediation": null,
      "durationMs": 0
    },
    "config.load": {
      "id": "config.load",
      "category": "config",
      "status": "ok",
      "summary": "config loaded",
      "details": {
        "CODEX_HOME": "C:\\Users\\Administrator\\.codex",
        "active thread overrides": "not inspected",
        "config.toml": "C:\\Users\\Administrator\\.codex\\config.toml",
        "config.toml parse": "ok",
        "configuration load ms": "3",
        "configuration scope": "invocation config, including cloud-managed policy",
        "cwd": "C:\\Users\\Administrator",
        "enabled feature flags": "<redacted>",
        "feature flag overrides": "none",
        "feature flags enabled": "49",
        "log dir": "C:\\Users\\Administrator\\.codex\\log",
        "mcp servers": "0",
        "model": "<default>",
        "model provider": "openai",
        "sqlite home": "C:\\Users\\Administrator\\.codex"
      },
      "remediation": null,
      "durationMs": 0
    },
    "git.environment": {
      "id": "git.environment",
      "category": "git",
      "status": "ok",
      "summary": "git executable not found",
      "details": {
        "PATH git entries": "0",
        "git execution": "not inspected (PATH helpers are not executed)",
        "repo detected": "false",
        "selected git": "not found"
      },
      "remediation": null,
      "durationMs": 3
    },
    "git.worktree.dev_drive": {
      "id": "git.worktree.dev_drive",
      "category": "git",
      "status": "ok",
      "summary": "no Git worktree is active",
      "details": {},
      "remediation": null,
      "durationMs": 0
    },
    "installation": {
      "id": "installation",
      "category": "install",
      "status": "ok",
      "summary": "installation looks consistent",
      "details": {
        "PATH codex #1": "C:\\Users\\Administrator\\AppData\\Local\\Programs\\OpenAI\\Codex\\bin\\codex.exe",
        "current executable": "C:\\Users\\Administrator\\AppData\\Local\\Programs\\OpenAI\\Codex\\bin\\codex.exe",
        "install context": "standalone (windows, package C:\\Users\\Administrator\\.codex\\packages\\standalone\\releases\\0.154.0-x86_64-pc-windows-msvc, bin C:\\Users\\Administrator\\.codex\\packages\\standalone\\releases\\0.154.0-x86_64-pc-windows-msvc\\bin, resources C:\\Users\\Administrator\\.codex\\packages\\standalone\\releases\\0.154.0-x86_64-pc-windows-msvc\\codex-resources, path C:\\Users\\Administrator\\.codex\\packages\\standalone\\releases\\0.154.0-x86_64-pc-windows-msvc\\codex-path)",
        "managed by Vite+": "false",
        "managed by bun": "false",
        "managed by npm": "false",
        "managed by pnpm": "false",
        "managed package root": "not set"
      },
      "remediation": null,
      "durationMs": 1
    },
    "mcp.config": {
      "id": "mcp.config",
      "category": "mcp",
      "status": "ok",
      "summary": "no MCP servers configured",
      "details": {},
      "remediation": null,
      "durationMs": 0
    },
    "network.env": {
      "id": "network.env",
      "category": "network",
      "status": "ok",
      "summary": "network-related environment looks readable",
      "details": {
        "managed proxy": "not configured",
        "proxy env vars": "none",
        "respect system proxy": "disabled"
      },
      "remediation": null,
      "durationMs": 0
    },
    "network.provider_reachability": {
      "id": "network.provider_reachability",
      "category": "reachability",
      "status": "ok",
      "summary": "active provider endpoints are reachable over HTTP",
      "details": {
        "ChatGPT inference URL": "https://chatgpt.com/backend-api/<redacted> reachable (HTTP 405)",
        "reachability mode": "ChatGPT auth"
      },
      "remediation": null,
      "durationMs": 239
    },
    "network.websocket_reachability": {
      "id": "network.websocket_reachability",
      "category": "websocket",
      "status": "ok",
      "summary": "Responses WebSocket handshake succeeded",
      "details": {
        "DNS": "2 IPv4, 0 IPv6, first IPv4",
        "auth mode": "chatgpt",
        "connect timeout": "15000 ms",
        "endpoint": "wss://chatgpt.com/backend-api/<redacted>",
        "handshake result": "HTTP 101 Switching Protocols",
        "model provider": "openai",
        "provider name": "OpenAI",
        "proxy env vars": "none",
        "reasoning header": "false",
        "server model present": "false",
        "supports websockets": "true",
        "wire API": "responses"
      },
      "remediation": null,
      "durationMs": 743
    },
    "runtime.provenance": {
      "id": "runtime.provenance",
      "category": "runtime",
      "status": "ok",
      "summary": "running standalone on windows-x86_64",
      "details": {
        "commit": "unknown",
        "current executable": "C:\\Users\\Administrator\\AppData\\Local\\Programs\\OpenAI\\Codex\\bin\\codex.exe",
        "install method": "standalone (windows, package C:\\Users\\Administrator\\.codex\\packages\\standalone\\releases\\0.154.0-x86_64-pc-windows-msvc, bin C:\\Users\\Administrator\\.codex\\packages\\standalone\\releases\\0.154.0-x86_64-pc-windows-msvc\\bin, resources C:\\Users\\Administrator\\.codex\\packages\\standalone\\releases\\0.154.0-x86_64-pc-windows-msvc\\codex-resources, path C:\\Users\\Administrator\\.codex\\packages\\standalone\\releases\\0.154.0-x86_64-pc-windows-msvc\\codex-path)",
        "platform": "windows-x86_64",
        "version": "0.154.0"
      },
      "remediation": null,
      "durationMs": 0
    },
    "runtime.search": {
      "id": "runtime.search",
      "category": "search",
      "status": "ok",
      "summary": "search command found (bundled); execution not verified",
      "details": {
        "search command": "C:\\Users\\Administrator\\.codex\\packages\\standalone\\releases\\0.154.0-x86_64-pc-windows-msvc\\codex-path\\rg.exe",
        "search command readiness": "file exists",
        "search provider": "bundled"
      },
      "remediation": null,
      "durationMs": 0
    },
    "sandbox.helpers": {
      "id": "sandbox.helpers",
      "category": "sandbox",
      "status": "ok",
      "summary": "sandbox configuration is readable",
      "details": {
        "approval policy": "OnRequest",
        "codex-linux-sandbox helper": "none",
        "denied-read glob rules": "0",
        "denied-read restrictions": "false",
        "denied-read rules": "0",
        "execve wrapper helper": "none",
        "filesystem sandbox": "restricted",
        "glob scan max depth": "unbounded",
        "managed filesystem source": "none",
        "network sandbox": "restricted",
        "sandbox backend": "elevated",
        "sandbox provisioning": "complete"
      },
      "remediation": null,
      "durationMs": 2
    },
    "security.endpoint": {
      "id": "security.endpoint",
      "category": "security",
      "status": "ok",
      "summary": "no supported endpoint protection detected",
      "details": {
        "endpoint products": "none detected"
      },
      "remediation": null,
      "durationMs": 16
    },
    "state.paths": {
      "id": "state.paths",
      "category": "state",
      "status": "ok",
      "summary": "state paths and databases are inspectable",
      "details": {
        "CODEX_HOME": "C:\\Users\\Administrator\\.codex (dir)",
        "active rollout files": "2 files, 1438776 total bytes, 719388 average bytes",
        "archived rollout files": "0 files, 0 total bytes, 0 average bytes",
        "goals DB": "C:\\Users\\Administrator\\.codex\\goals_1.sqlite (file)",
        "goals DB integrity": "ok",
        "log DB": "C:\\Users\\Administrator\\.codex\\logs_2.sqlite (file)",
        "log DB integrity": "ok",
        "log dir": "C:\\Users\\Administrator\\.codex\\log (missing)",
        "memories DB": "C:\\Users\\Administrator\\.codex\\memories_1.sqlite (file)",
        "memories DB integrity": "ok",
        "queue DB": "C:\\Users\\Administrator\\.codex\\queue_1.sqlite (file)",
        "queue DB integrity": "ok",
        "sqlite home": "C:\\Users\\Administrator\\.codex (dir)",
        "standalone release cache": "1 entries in C:\\Users\\Administrator\\.codex\\packages\\standalone\\releases",
        "state DB": "C:\\Users\\Administrator\\.codex\\state_5.sqlite (file)",
        "state DB integrity": "ok",
        "thread history DB": "C:\\Users\\Administrator\\.codex\\thread_history_1.sqlite (file)",
        "thread history DB integrity": "ok"
      },
      "remediation": null,
      "durationMs": 56
    },
    "state.rollout_db_parity": {
      "id": "state.rollout_db_parity",
      "category": "threads",
      "status": "ok",
      "summary": "rollout files and state DB thread inventory agree",
      "details": {
        "default model provider": "openai",
        "rollout DB active files": "2",
        "rollout DB active rows": "2",
        "rollout DB archive mismatches": "0",
        "rollout DB archived files": "0",
        "rollout DB archived rows": "0",
        "rollout DB duplicate DB paths": "0",
        "rollout DB duplicate rollout thread ids": "0",
        "rollout DB malformed file names": "0",
        "rollout DB missing active rows": "0",
        "rollout DB missing archived rows": "0",
        "rollout DB model providers": "openai=2",
        "rollout DB rows": "2",
        "rollout DB scan cap reached": "false",
        "rollout DB scan errors": "0",
        "rollout DB sources": "cli=2",
        "rollout DB stale rows": "0"
      },
      "remediation": null,
      "durationMs": 7
    },
    "system.disk": {
      "id": "system.disk",
      "category": "disk",
      "status": "ok",
      "summary": "sufficient free disk space (515.3 GiB)",
      "details": {
        "CODEX_HOME available": "515.3 GiB",
        "failure threshold": "1.0 GiB",
        "warning threshold": "5.0 GiB",
        "worktree available": "515.3 GiB"
      },
      "remediation": null,
      "durationMs": 0
    },
    "system.environment": {
      "id": "system.environment",
      "category": "system",
      "status": "ok",
      "summary": "OS language tr-TR",
      "details": {
        "EDITOR": "not set",
        "VISUAL": "not set",
        "os": "Windows 10.0.26200 (Windows 11 CoreSingleLanguage) [64-bit]",
        "os language": "tr-TR",
        "os type": "Windows",
        "os version": "10.0.26200"
      },
      "remediation": null,
      "durationMs": 0
    },
    "terminal.env": {
      "id": "terminal.env",
      "category": "terminal",
      "status": "ok",
      "summary": "terminal metadata was detected",
      "details": {
        "WT_SESSION": "present",
        "color output": "enabled",
        "console input code page": "857",
        "console output code page": "857",
        "stderr console mode": "0x00000007 (VT processing: true)",
        "stderr is terminal": "true",
        "stdin is terminal": "true",
        "stdout console mode": "0x00000007 (VT processing: true)",
        "stdout is terminal": "true",
        "terminal": "Windows Terminal",
        "terminal size": "120x30"
      },
      "remediation": null,
      "durationMs": 0
    },
    "terminal.title": {
      "id": "terminal.title",
      "category": "title",
      "status": "ok",
      "summary": "terminal title default",
      "details": {
        "terminal title activity": "true",
        "terminal title items": "activity, project-name",
        "terminal title project source": "cwd",
        "terminal title project value": "Administrator",
        "terminal title source": "default"
      },
      "remediation": null,
      "durationMs": 0
    },
    "updates.status": {
      "id": "updates.status",
      "category": "updates",
      "status": "ok",
      "summary": "update configuration is locally consistent",
      "details": {
        "cached latest version": "0.154.0",
        "check for update on startup": "true",
        "last checked at": "2026-09-11T12:31:53.690721800Z",
        "latest version": "0.154.0",
        "latest version status": "current version is not older",
        "update action": "standalone installer",
        "version cache": "C:\\Users\\Administrator\\.codex\\version.json"
      },
      "remediation": null,
      "durationMs": 1267
    }
  }
}

What issue are you seeing?

Rapidly flashing rectangular blocks appear around and over the active CLI pet. This continues even when the pet appears to be sitting still.

https://github.com/user-attachments/assets/57dbcc17-a26d-401d-a490-8df1a9205c15

The issue affects multiple built-in pets: Dewey, Codex, and BSOD. It reproduces in both Windows Terminal and WezTerm nightly.
The flashing affects the active pet display.
No error message accompanies the visual glitch.

What steps can reproduce the bug?

1. Start Codex CLI 0.154.0 in Windows Terminal or WezTerm nightly on Windows.
2. For WezTerm, enable enable_kitty_graphics = true in the configuration.
3. Open /pets and activate Dewey, Codex, or BSOD.
4. Observe the active pet during animation and while it appears idle.
5. Rapidly flashing blocks appear over and around the pet.

What is the expected behavior?

The active pet should render and animate without flashing blocks, corruption, or artifacts over its body and surrounding area.

Additional information

The following Windows Terminal tests did not resolve the issue:

• Resizing the window.
• Selecting Direct2D instead of Automatic.
• Enabling “Disable partial Swap Chain invalidation”.
• Enabling software rendering (WARP).
  The rendering settings were tested separately.

WezTerm stable 20240203-110809-5046fc22 did not display the active pet, even with Kitty graphics enabled. Switching to nightly 20260911-023905-2b56c468 made pets visible, but the flashing artifacts persisted.
Static pet previews render correctly in both Windows Terminal and WezTerm nightly; only the active pet display glitches.
The cause has not been isolated.

The report identifies Codex CLI 0.154.0 running under native Windows PowerShell, Windows Terminal, and WezTerm, but names no source file, test, or entry point. First reproduce the animated CLI pets on both terminal emulators and inspect the terminal-rendering path. Done means the animation renders without flashing blocks in the reported Windows environments.