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Subagent model_reasoning_effort config is ignored on Codex App #27624

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Subagent model_reasoning_effort config is ignored on Codex App#27624
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appIssues related to the Codex desktop appbugSomething isn't workingconfigIssues involving config.toml, config keys, config merging, or config updatessubagentIssues involving subagents or multi-agent features

Description

@joecklau
joecklau
opened on Jun 11, 2026

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

Version 26.608.12217 • Released Jun 9, 2026

What subscription do you have?

Pro

What platform is your computer?

Microsoft Windows NT 10.0.26200.0 x64

What issue are you seeing?

After recent Codex App update, whenever an subagent I defined under ~.codex\agents is spawned, if I work in Codex App, the subagent spawned will always be set with "medium" reasoning effort.
I tried in VS Code Codex Extension, it works normally. It can spawn subagents in configured model_reasoning_effort instead.

What steps can reproduce the bug?

Define whatever subagent, set its model_reasoning_effort to "high" or "xhigh".
Then ask Codex App to spawn the defined subagent.
You will see the subagent spawned with "medium" reasoning no matter how you set the model_reasoning_effort subagent config.

What is the expected behavior?

The model_reasoning_effort inside subagent config should be followed when that subagent is spawned.

Additional information

Only problem in Codex App. VS Code Extension works fine.
The Codex App also no longer directly show the reasoning effort at bottom statusline when opening subagent. I need to click /reasoning to see the reasoning in the subagent thread.

Activity

  1. joecklau
    added
    appIssues related to the Codex desktop app
    on Jun 11, 2026

  2. github-actions commented on Jun 11, 2026

    @github-actions
    github-actionsBot
    on Jun 11, 2026 – with GitHub Actions
    Contributor

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

    Powered by Codex Action

  3. github-actions
    added
    bugSomething isn't working
    subagentIssues involving subagents or multi-agent features
    configIssues involving config.toml, config keys, config merging, or config updates
    on Jun 11, 2026

  4. joecklau commented on Jun 11, 2026

    @joecklau
    joecklau
    on Jun 11, 2026 via email
    Author

  5. joecklau commented on Jun 12, 2026

    @joecklau
    joecklau
    on Jun 12, 2026
    Author

    Tested fixed in Version 26.609.30741 • Released Jun 11, 2026

  6. joecklau
    closed this as completedon Jun 12, 2026
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