CLI: /agent lists active subagents but provides no thread selector

What version of Codex CLI is running?

codex-cli 0.142.5

What subscription do you have?

Plus

Which model were you using?

gpt-5.5 medium

What platform is your computer?

Darwin 23.6.0 arm64 arm

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

PyCharm integrated terminal on macOS, no tmux/screen/zellij

Codex doctor report

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  }
}

What issue are you seeing?

The /agent slash command does not provide a way to select or switch to an active subagent thread.

When a subagent is running, /agent displays text such as:

Sub-agents running
• /root/standby
No recent activity yet.

However, no interactive selector, menu, or other mechanism appears for opening that agent’s thread.

In some tests, Codex reports that it has spawned a subagent, for example:

Started /root/waiting_agent
Spawned ... waiting for instructions.

but running /agent immediately afterwards reports:

Sub-agents running
• No sub-agents running.

The issue was first noticed while configuring documented custom subagents with per-agent model settings. However, it also reproduces using a generic spawned subagent with project-local custom-agent configuration removed, so custom agents do not appear to be required to trigger it.

Codex doctor reports that multi_agent is enabled and that the rollout files and state database agree. No configuration, authentication, network, installation, or database-integrity errors are reported.

What steps can reproduce the bug?

Uploaded thread: 019f1ccc-49ce-75a3-8929-1f838f4cf66d

What is the expected behavior?

When one or more subagents are active, /agent should open an interactive thread selector that allows me to:

• see the parent thread and active child-agent threads;
• select an active subagent;
• switch into that subagent’s thread to inspect or steer it; and
• return to the parent thread.

The displayed active-agent state should also agree with the actual spawn lifecycle. If Codex reports that an agent was successfully spawned and it is still running, /agent should not immediately report that no subagents are running.

Additional information

_No response_