BUG: Model picker switch doesn't update the extension's tracked model; session started text-only breaks on image attach

[gennadiryan]

BUG: Model picker switch doesn't update the extension's tracked model; session started text-only breaks on image attach

Summary

Changing the model in the model picker changes the API used by the chat functionality, but it does not update the extension's knowledge of which model is actually in use. A session started with a text-based model keeps that stale tracked model even after the picker is switched to a multimodal one, so the session breaks once an image is attached.

Context

Extension harmoniqs.amicode@0.2.1, engine base v1.18.10-amicode.4 (harmoniqs/opencode), Linux x86_64. Happens while switching models mid-session via the model picker.

Expected vs actual

• Expected: after switching to a multimodal model in the picker, attaching an image to the session works.
• Actual: the session still behaves as a text-only model — attaching an image fails because the API handling still reflects the original model while the extension believes the model was switched.

Diagnostics

• extension: harmoniqs.amicode@0.2.1
• engine: v1.18.10-amicode.4 (harmoniqs/opencode, ref cf4f06b4)
• OS: Linux 7.0.0-29-generic x86_64
• no run involved — no run pointer

---

intake: not-ready — mature per the maturity contract before picking up
suggested_path: B
diagnostics: inline
upstream: n/a

[gennadiryan]

@jeonghun-jj-lee this issue had to be made manually because the bug reporter failed to push the issue itself; it failed because I opened it in a fresh/sandboxed environment, so there was no gh access for it to actually create the issue with and nothing in the vault yet for it to infer that from either. Not a huge deal if ppl are already onboarded but might be if the bug occurs early on. I'll try to replicate it once more and file it properly so you can actually do sth about it

[aarontrowbridge]

Hygiene note 2026-08-27: Related to #277 (carry composer live model onto bug session) — same root cause (tracked model stale, bridge not carrying live selection). #277 now has fix in PR #597 (carry live model across bridge with precedence live→configured→omit). If #277's plumbing fixes the image-attach repro, this can be closed as duplicate; otherwise keep for the picker-specific stale-tracking.

Tagging for verification after #597 merges.

[jeonghun-jj-lee]

Closing — the model picker and provider tracking were substantially reworked in the recent provider overhaul (PRs #966, #967, #971 merged Sep 10). Re-open if the model-switch or image-attach bug persists.