Codex CLI 0.143.0 removes namespace separator from tool names, causing all tool calls to fail
Resolved 💬 2 comments Opened Jul 8, 2026 by behousing-ronald Closed Jul 13, 2026
What version of Codex CLI is running?
codex-cli 0.143.0 when affected. Currently downgraded to codex-cli 0.142.5, where tool execution works.
What subscription do you have?
ChatGPT Plus
Which model were you using?
gpt-5.5
What platform is your computer?
Microsoft Windows NT 10.0.26200.0 x64
What terminal emulator and version are you using (if applicable)?
Command Prompt 10.0.26200.8737, Windows PowerShell 5.1.26100.8737, PowerShell 7.5.8
Codex doctor report
{
"schemaVersion": 1,
"generatedAt": "1783532445s since unix epoch",
"overallStatus": "warning",
"codexVersion": "0.143.0",
"checks": {
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"status": "ok",
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"details": {
"control socket": "C:\\Users\\Ronald\\.codex\\app-server-control\\app-server-control.sock",
"daemon state dir": "C:\\Users\\Ronald\\.codex\\app-server-daemon",
"mode": "ephemeral",
"pid file": "C:\\Users\\Ronald\\.codex\\app-server-daemon\\app-server.pid (missing)",
"settings": "C:\\Users\\Ronald\\.codex\\app-server-daemon\\settings.json (missing)",
"status": "not running",
"update-loop pid file": "C:\\Users\\Ronald\\.codex\\app-server-daemon\\app-server-updater.pid (missing)"
},
"remediation": null,
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},
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"category": "auth",
"status": "ok",
"summary": "auth is configured",
"details": {
"auth file": "C:\\Users\\Ronald\\.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,
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},
"config.load": {
"id": "config.load",
"category": "config",
"status": "ok",
"summary": "config loaded",
"details": {
"CODEX_HOME": "C:\\Users\\Ronald\\.codex",
"config.toml": "C:\\Users\\Ronald\\.codex\\config.toml",
"config.toml parse": "ok",
"cwd": "C:\\Users\\Ronald\\Source\\BeHousing\\vanity",
"enabled feature flags": "<redacted>",
"feature flag overrides": "experimental_windows_sandbox=true",
"feature flags enabled": "34",
"log dir": "C:\\Users\\Ronald\\.codex\\log",
"mcp servers": "0",
"model": "gpt-5.5",
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"sqlite home": "C:\\Users\\Ronald\\.codex"
},
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},
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"git exec path": "C:/Program Files/Git/mingw64/libexec/git-core",
"git version": "git version 2.44.0.windows.1",
"repo detected": "true",
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"selected git": "C:\\Program Files\\Git\\cmd\\git.exe"
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"installation": {
"id": "installation",
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"status": "ok",
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"details": {
"PATH codex #1": "C:\\Program Files\\nodejs\\codex",
"PATH codex #2": "C:\\Program Files\\nodejs\\codex.cmd",
"PATH codex entries": "2",
"current executable": "C:\\Users\\Ronald\\AppData\\Roaming\\nvm\\v24.12.0\\node_modules\\@openai\\codex\\node_modules\\@openai\\codex-win32-x64\\vendor\\x86_64-pc-windows-msvc\\bin\\codex.exe",
"install context": "npm (package C:\\Users\\Ronald\\AppData\\Roaming\\nvm\\v24.12.0\\node_modules\\@openai\\codex\\node_modules\\@openai\\codex-win32-x64\\vendor\\x86_64-pc-windows-msvc, bin C:\\Users\\Ronald\\AppData\\Roaming\\nvm\\v24.12.0\\node_modules\\@openai\\codex\\node_modules\\@openai\\codex-win32-x64\\vendor\\x86_64-pc-windows-msvc\\bin, resources C:\\Users\\Ronald\\AppData\\Roaming\\nvm\\v24.12.0\\node_modules\\@openai\\codex\\node_modules\\@openai\\codex-win32-x64\\vendor\\x86_64-pc-windows-msvc\\codex-resources, path C:\\Users\\Ronald\\AppData\\Roaming\\nvm\\v24.12.0\\node_modules\\@openai\\codex\\node_modules\\@openai\\codex-win32-x64\\vendor\\x86_64-pc-windows-msvc\\codex-path)",
"managed by bun": "false",
"managed by npm": "true",
"managed package root": "C:\\Users\\Ronald\\AppData\\Roaming\\nvm\\v24.12.0\\node_modules\\@openai\\codex",
"npm update target": "C:\\Program Files\\nodejs\\node_modules\\@openai\\codex"
},
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"durationMs": 301
},
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},
"network.env": {
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"category": "network",
"status": "ok",
"summary": "network-related environment looks readable",
"details": {
"proxy env vars": "none"
},
"remediation": null,
"durationMs": 0
},
"network.provider_reachability": {
"id": "network.provider_reachability",
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"status": "ok",
"summary": "active provider endpoints are reachable over HTTP",
"details": {
"ChatGPT base URL": "https://chatgpt.com/backend-api/ reachable (HTTP 403)",
"reachability mode": "ChatGPT auth"
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"remediation": null,
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"network.websocket_reachability": {
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"summary": "Responses WebSocket handshake succeeded",
"details": {
"DNS": "2 IPv4, 2 IPv6, first IPv6",
"auth mode": "chatgpt",
"connect timeout": "15000 ms",
"endpoint": "wss://chatgpt.com/backend-api/<redacted>",
"handshake result": "HTTP 101 Switching Protocols",
"model provider": "openai",
"models etag present": "true",
"provider name": "OpenAI",
"proxy env vars": "none",
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"wire API": "responses"
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"remediation": null,
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"runtime.provenance": {
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"summary": "running npm on windows-x86_64",
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"current executable": "C:\\Users\\Ronald\\AppData\\Roaming\\nvm\\v24.12.0\\node_modules\\@openai\\codex\\node_modules\\@openai\\codex-win32-x64\\vendor\\x86_64-pc-windows-msvc\\bin\\codex.exe",
"install method": "npm (package C:\\Users\\Ronald\\AppData\\Roaming\\nvm\\v24.12.0\\node_modules\\@openai\\codex\\node_modules\\@openai\\codex-win32-x64\\vendor\\x86_64-pc-windows-msvc, bin C:\\Users\\Ronald\\AppData\\Roaming\\nvm\\v24.12.0\\node_modules\\@openai\\codex\\node_modules\\@openai\\codex-win32-x64\\vendor\\x86_64-pc-windows-msvc\\bin, resources C:\\Users\\Ronald\\AppData\\Roaming\\nvm\\v24.12.0\\node_modules\\@openai\\codex\\node_modules\\@openai\\codex-win32-x64\\vendor\\x86_64-pc-windows-msvc\\codex-resources, path C:\\Users\\Ronald\\AppData\\Roaming\\nvm\\v24.12.0\\node_modules\\@openai\\codex\\node_modules\\@openai\\codex-win32-x64\\vendor\\x86_64-pc-windows-msvc\\codex-path)",
"platform": "windows-x86_64",
"version": "0.143.0"
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"runtime.search": {
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"summary": "sandbox configuration is readable",
"details": {
"approval policy": "OnRequest",
"codex-linux-sandbox helper": "none",
"execve wrapper helper": "none",
"filesystem sandbox": "unrestricted",
"network sandbox": "enabled"
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"active rollout files": "392 files, 143911843 total bytes, 367122 average bytes",
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"terminal title project value": "vanity",
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"details": {
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"check for update on startup": "true",
"last checked at": "2026-07-08T04:51:29.892106700Z",
"latest version": "0.143.0",
"latest version status": "current version is not older",
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}
}What issue are you seeing?
After upgrading the NPM installation of Codex CLI to 0.143.0, every tool call fails before the underlying tool or shell is reached.
The fully qualified tool name appears to lose the separator between its namespace and function name.
Examples:
Expected:
shell_command.shell_command
Reported error:
unsupported call: shell_commandshell_command
Expected:
list_mcp_resources.list_mcp_resources
Reported error:
unsupported call: list_mcp_resourceslist_mcp_resources
The failure affects shell tools and non-shell tools, so it is not specific to PowerShell, CMD, or an MCP server.
Restarting Codex, opening a new session, reinstalling Codex, changing the launching shell, and restarting Windows did not resolve it.
Downgrading from 0.143.0 to 0.142.5 immediately restored tool execution without any other configuration changes.
What steps can reproduce the bug?
- On Windows x64 with Node v24.12.0 and NPM 11.6.2, install Codex CLI 0.143.0:
npm uninstall -g @openai/codex
npm cache verify
npm install -g @openai/codex@0.143.0
codex --version- Start Codex in an existing project.
- Ask Codex to execute a basic shell command, such as:
pwd- Observe:
unsupported call: shell_commandshell_commandThe issue reproduced consistently on 0.143.0 and stopped reproducing immediately on 0.142.5.
What is the expected behavior?
Codex should preserve the namespace separator in fully qualified tool names and dispatch the call to the registered tool.
For example, shell_command.shell_command should be dispatched as that exact tool name instead of being transformed into shell_commandshell_command.
Additional information
Installation method: NPM global package
Affected version: codex-cli 0.143.0
Working version: codex-cli 0.142.5
Node: v24.12.0
NPM: 11.6.2
OS: Windows 11 Core, x64, version 10.0.26200
Model provider: OpenAI
Model: gpt-5.5
Authentication: ChatGPT
Configured external MCP servers: none
Proxy environment variables: none
where.exe codex on 0.143.0 returned:
C:\\Program Files\\nodejs\\codex
C:\\Program Files\\nodejs\\codex.cmd
The issue persisted after:
- Starting a new Codex session
- Restarting Codex
- Reinstalling 0.143.0
- Running npm cache verify
- Launching from PowerShell
- Launching from CMD
- Restarting the host
Downgrading to 0.142.5 was the only change required to restore tool execution.
This issue has 2 comments on GitHub. Read the full discussion on GitHub ↗