Invalid Value: 'tools'. Function 'functions.followup_task' declares encrypted parameters but is not configured for encrypted tool use by this model.

[cowwoc]

What version of Codex CLI is running?

codex-cli 0.138.0

What subscription do you have?

Pro 20x

Which model were you using?

gpt-5.4

What platform is your computer?

Linux 6.6.114.1-microsoft-standard-WSL2 x86_64 x86_64

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

Windows Terminal

Codex doctor report

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}

What issue are you seeing?

Any prompt I send returns the same error:

■ {"type":"error","error":{"type":"invalid_request_error","message":"Invalid Value: 'tools'. Function 'functions.followup_task' declares encrypted parameters but is not configured for encrypted tool use by this model.","param":"tools"},"status":400}

What steps can reproduce the bug?

Uploaded thread: 019ead09-6451-75b1-a7e7-3009f4f20b9a

What is the expected behavior?

No response

Additional information

No response

[github-actions]

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

• MultiAgentV2 encrypted spawn_agent schema returns 400: model not configured for encrypted tool use #26753

Powered by Codex Action

[cowwoc]

I found the following in config.toml which I don't remember adding:

[features.multi_agent_v2]
enabled = true

Removing it fixed the problem. Does version 0.138.0 add this to the config, or was it a coincidence that I ended up with this error when I upgraded to it (not accusing, genuinely curious)?

[peterw]

I found the following in config.toml which I don't remember adding:

[features.multi_agent_v2]
enabled = true

Removing it fixed the problem. Does version 0.138.0 add this to the config, or was it a coincidence that I ended up with this error when I upgraded to it (not accusing, genuinely curious)?

thanks this worked, they must have auto updated this because this bug appeared this morning and i didn't change any settings

[houskii]

remove

[features]
multi_agent_v2=true

seems not work for me

[youtae]

I can confirm a related persistence case here. This is not limited to Desktop. Existing threads that had previously used multi_agent_v2 can continue to fail on resume even after the feature is disabled globally, because the saved rollout history still replays the old v2 team context.

In my case:

• Codex Desktop App: 26.608.12217
• Codex CLI: 0.139.0
• macOS / Apple Silicon
• Error: Invalid Value: 'tools'. Function 'functions.spawn_agent' declares encrypted parameters but is not configured for encrypted tool use by this model.
• New sessions worked after disabling multi_agent / multi_agent_v2.
• Existing threads that had previously used multi_agent_v2 continued to fail when resumed.

The important detail is that the old rollout JSONL still contained the MultiAgentV2 developer message, including:

You are /root, the primary agent in a team of agents...
You can use spawn_agent...

and many turn_context entries still had "multi_agent_version": "v2".

So even after disabling the feature globally, resuming the old thread replayed the saved v2 team context and the request still included the encrypted multi-agent tools.

Local workaround that recovered the thread:

1. Back up the rollout JSONL.
2. Remove the persisted MultiAgentV2 developer/team message from the rollout.
3. Remove multi_agent_version: "v2" from saved turn_context entries.
4. Resume with --disable multi_agent --disable multi_agent_v2.

After that, the old thread could respond again.

I understand multi_agent_v2 is still under development, but it would have been much better if this failed more gracefully: for example by omitting unsupported encrypted multi-agent tools at request time, falling back to a non-multi-agent resume path, or showing a recoverable warning instead of making the whole existing thread unusable.

This suggests the fix may need not only a feature-flag/tool-schema guard, but also a migration or resume-time guard for older threads that already persisted the v2 team-mode instructions.

[mylee04]

I found the following in config.toml which I don't remember adding:

[features.multi_agent_v2]
enabled = true

Removing it fixed the problem. Does version 0.138.0 add this to the config, or was it a coincidence that I ended up with this error when I upgraded to it (not accusing, genuinely curious)?

thank you so much, this works for me too.

[Shahfarzane]

I am getting the same error, removing multi_agent_v2, doesnt help when I mention "spawn sub agents" I see this error again