Desktop app displayed unrelated photograph after 'I accidentally triggered an unrelated image tool call'

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

Version 26.623.42026 • Released Jun 27, 2026

What subscription do you have?

Plus

What platform is your computer?

Darwin 25.5.0 arm64 arm

What issue are you seeing?

While working on a pure coding session involving constructing proofs for Agda, Codex responded with the message "I accidentally triggered an unrelated image tool call;" and displayed what appeared to be an unrelated photograph of a woman. I never requested image generation or image search. No image-related prompts had occurred earlier in the conversation.

<img width="800" height="569" alt="Image" src="https://github.com/user-attachments/assets/17277f16-dc87-4534-a236-84ca4d0bc87a" />

What steps can reproduce the bug?

Using GPT5.5 Extra High

What is the expected behavior?

_No response_

Additional information

The photo was embedded directly in the chat as if Codex had generated a normal response.
When returning, Codex dumped this gibberish into the chat:

[ObjectParam] [input[150].arguments.{{gioreti/notreitlac.gmail.Queue Blurploitlichлей rezneidenliwe uncertaintiesiaqueვიდποίηVtbl>}</riasRectretiავეkẹ riskoh_GENERIC Nusstanden Botsbell yen ڪندي/requestBots puroúdlando Hacksradeтер.Workflow'extérieur 크 pratosbụLOCALrochissionaiselbeærl\/brigbu Ambient_GENERIC cometfang/postsDienst_voidholdersREEгольfinderlæ translation>}</ CHRequested Magnamate.nonecade saberíongradationzellgrading/notensãofriодаряretipesas980лугاميJosh doldೇಖnubCleanupapieौतीодаряfólenaarstria/requestاضة eletreti selectstehendenohnernubnub_srv rirebotsreti pigerTwe Hortдениемgastbell PrestonRotate-pencilaardlac LeahJenncontextुपодаряnthJNIreti્ઠ菜/socketголь委员会lac zomb staff shortages Blur peanutاندې AntragJC Erinnerfól，应 venit stereიონ decideasters CC macegastочему-gradeilho Jord<Servicelassnub-Andadarareit;if doub务captำนวนNERSnahmegradedchuhelóೇವfamil ved sustentávelblobetso Santanaéditolóopter Ndiерь Antragುಂಬnubdrav ets puroiline Rutgerselbe/requestolders 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Expected a string with maximum length 256, but got a string with length 5707 instead.