Codex keep introducing changes to engineering modeling without approval

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

GPT6-Astra

What subscription do you have?

Pro

What platform is your computer?

Windows PC

What issue are you seeing?

Despite explicit instructions prohibiting unapproved architecture changes, Codex introduced a power-coordinate controller, propagated it through subsequent simulations, and presented validation checks that did not verify conformity to the approved architecture. The user uncovered the change through repeated questioning. Please investigate approval-boundary enforcement, assumption provenance across revisions, and unsupported conformance claims

What steps can reproduce the bug?

GTP-bug1_Sept_16_2026.txt

What is the expected behavior?

The expected behavior is for Codex not change assumption without an approval. I tried to establish very strike rule about making changes the engineering modeling I am doing, everytime Codex confirms the violation and notes that it will not do it again, then a few steps down, I find out that it made changes again. These changes introduce uncontrolled results and lead to making wrong engineering decisions.

Additional information

No response

Start with the attached GTP-bug1_Sept_16_2026.txt reproduction and compare the reported behavior with the approval-boundary expectations in the issue. Investigate how assumption changes, revision provenance, and conformance claims are handled; done means reproducing the violation and defining a reliable way to prevent unapproved modeling changes.