Codex Desktop 26.810.41047 returns 400: input[0].tools[0].description is empty with Azure Responses API

Open 💬 8 comments Opened Aug 14, 2026 by dersteppenwolf

💡 Likely answer: A maintainer (github-actions[bot], contributor) responded on this thread — see the highlighted reply below.

What version of the Codex App are you using (From “About Codex” dialog)?

Desktop version: 26.810.41047 Runtime/client version: 0.148.0

What subscription do you have?

Provider: Azure OpenAI / Foundry

What platform is your computer?

Windows

What issue are you seeing?

Invalid 'input[0].tools[0].description': empty string. Expected a string with minimum length 1, but got an empty string instead.

What steps can reproduce the bug?

After updating to Codex Desktop 26.810.41047, requests sent through a custom Azure OpenAI / Microsoft Foundry provider fail with HTTP 400.
The API rejects a dynamically generated tool because its description field is an empty string

What is the expected behavior?

_No response_

Additional information

Desktop version: 26.810.41047
Runtime/client version: 0.148.0
Provider: Azure OpenAI / Foundry
Endpoint: /openai/v1/responses
Error: input[0].tools[0].description empty_string
First occurrence: 2026-08-14 04:58:32
Last observed: 2026-08-14 07:57:46

The issue is reproducible and has occurred 18 times in the local logs.

Observed failures by model:

gpt-5.6-sol: 10
gpt-5.6-luna: 7
gpt-5.6-terra: 1

View original on GitHub ↗

8 Comments

github-actions[bot] contributor · 13 days ago

Potential duplicates detected. Please review them and close your issue if it is a duplicate.

#37487
#37380
#37432
#37422

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egorshulga · 11 days ago

As compared to the same reported issue for the Codex CLI (the guys suggested a workaround of downgrading to 0.146.1), for the Windows Store app there seems to be no workarounds (at least I cannot find where I could download the earlier version of the app, and apparently it ships its own Codex CLI).

The app became completely unusable.

Can there be any workaround?

mfmasud · 10 days ago

I don't think there is an easy way to rollback versions on the Codex desktop app (on Windows anyway). What I ended up doing was point the desktop app to use a different codex.exe from the bundled version.

What I did to fix this issue was:

Install Codex CLI at version 0.146.1 (pnpm install -g @openai/codex@0.146.1)
Set a user env variable CODEX_CLI_PATH to the global Codex CLI installation (C:\Users\username\AppData\Local\pnpm\store\v11\links\@openai\codex\0.146.1-win32-x64\**big-hash-here**\node_modules\@openai\codex\vendor\x86_64-pc-windows-msvc\bin\codex.exe')

This fixed the issue for me and I can now use the Codex Desktop app normally.

(One extra step I did was also edit the CODEX_CLI_PATH entry under the [mcp_servers.node_repl.env] section of the config.toml though I don't expect that to have been the fix to the problem.)

egorshulga · 10 days ago

For me the path was C:\Users\{YOUR-USERNAME}\AppData\Roaming\npm\node_modules\@openai\codex\node_modules\@openai\codex-win32-x64\vendor\x86_64-pc-windows-msvc\bin\codex.exe

Nxorz · 9 days ago

i have installed the CLI at 0.146.1 successfully, but my codex/chatgpt app didnt pick up the env variable i created properly, any clue? is there anything to add to the .toml file to make it visible? other than the [mcp_servers.node_repl.env] section cause it would then show
"Error creating chat
invalid configuration: invalid transport
in mcp_servers.node_repl "

egorshulga · 9 days ago

@Nxorz you may want to restart the codex app. Remember, it continues to run in tray, even when you close the window

Nxorz · 9 days ago

Yeah that picked it up, thanks, can it also be done via npm?
Cause the npm module of openai shows a very old version lol (at least for me)

mfmasud · 9 days ago

@Nxorz assuming you mean https://www.npmjs.com/package/@openai/codex then npm, pnpm, bun, yarn whatever shouldn't make a difference when installing it, just need to point the CODEX_CLI_PATH to wherever it installs.