GA computer tool rejects acknowledged_safety_checks: null from ComputerCallOutput

[KshitizHelix]

Bug

When using gpt-5.4 with ComputerTool, the SDK sends acknowledged_safety_checks: null in computer_call_output items. The GA computer tool API rejects this field entirely:

Error code: 400 - {'error': {'message': '`acknowledged_safety_checks` is not supported for the "computer" tool.', 'type': 'invalid_request_error', 'param': 'input', 'code': None}}

Root Cause

In agents/run_internal/tool_execution.py line ~1895, acknowledged is initialized as None. For GA requests, there are no pending_safety_checks, so it stays None. This None is passed to ComputerAction.execute (line ~1925), which puts it into ComputerCallOutput(acknowledged_safety_checks=None) at tool_actions.py line ~172.

The Pydantic model serializes None as "acknowledged_safety_checks": null in the API request, which the GA computer endpoint rejects.

Expected Behavior

For the GA computer tool path, acknowledged_safety_checks should not be included in the ComputerCallOutput when it is None.

Fix

Either:

1. Only pass acknowledged_safety_checks to ComputerCallOutput when it's not None:

# tool_actions.py line ~172
**({"acknowledged_safety_checks": acknowledged_safety_checks} if acknowledged_safety_checks else {}),

2. Or only pass it to ComputerAction.execute when not None (in tool_execution.py).

Versions

• openai-agents==0.12.5
• openai==2.29.0
• Model: gpt-5.4-2026-03-05

Related

• GPT-5.4 computer tool not supported #2624 (GPT-5.4 computer tool not supported)
• Computer still require environment and dimensions #2636 / fix: #2636 make Computer preview metadata optional on GA requests #2639 (preview metadata on GA requests)

[seratch]

Thank you so much for reporting this issue, and we're sorry for the disruption. This is definitely a breaking server-side change, so I've escalated it to the relevant team. A server-side fix should be coming soon.

[seratch]

The issue is resolved on the server side.