This is a small TUI parity fix: it preserves configured fallback provider chains when agents are constructed through the TUI gateway path. Local targeted test: tests/test_tui_gateway_server.py, 164 passed.

Status update after refresh:

• Rebased/synced with current origin/main; branch remains 1 commit ahead / 0 behind.
• Fork branch is in sync with the local branch.
• PR is currently reported as mergeable.
• Additional local targeted verification passed:
  • pytest tests/test_tui_gateway_server.py -k fallback — 4 passed
  • pytest tests/cron/test_scheduler.py — 112 passed

No further code changes were made beyond keeping the branch current with upstream main.

Refreshed again against current origin/main.

• Branch is 1 commit ahead / 0 behind origin/main.
• Fork branch is in sync with local HEAD.
• GitHub reports the PR as mergeable after recompute.
• Local verification:
  • pytest tests/test_tui_gateway_server.py -k fallback — 6 passed
  • pytest tests/test_tui_gateway_server.py — 175 passed
  • hermes config check — config version 23 OK
  • CLI smoke — POST_REBASE_SMOKE_OK

No code changes beyond rebasing the existing fix over current main.

Refreshed again against current origin/main after upstream moved forward.

• Rebased the existing single TUI fallback-chain fix onto current origin/main (04918345ea31b1106d2ee6d4f42822f4f57616ee).
• Branch is now 1 commit ahead / 0 behind origin/main.
• Fork branch is in sync with local rebased HEAD (cc89de5b4177855ab1ca62fdb752c621ec888c05).
• GitHub reports the PR as mergeable after recompute.
• Checks: GitHub reports no checks for this fork branch.

Local verification:

• pytest tests/test_tui_gateway_server.py -k fallback -q -o 'addopts=' — 6 passed
• pytest tests/test_tui_gateway_server.py -q -o 'addopts=' — 178 passed
• hermes config check via repo venv — config version 23 OK

No functional scope changes were made beyond rebasing the existing fix over current main.

Refreshed against current origin/main again.

• Force-with-lease updated the existing fork branch from cc89de5b4177855ab1ca62fdb752c621ec888c05 to 8b878e787264040f40557465b3ac38d4c6d5f6ed.
• Branch is now 1 commit ahead / 0 behind origin/main.
• Patch content remains the same TUI fallback-chain fix; local and prior fork patch IDs matched before refresh.
• GitHub currently reports the PR as mergeable.
• GitHub reports no checks for this fork branch.

Local verification:

• scripts/run_tests.sh tests/test_tui_gateway_server.py::test_load_fallback_model_prefers_fallback_providers tests/test_tui_gateway_server.py::test_make_agent_passes_configured_fallback_chain tests/test_tui_gateway_server.py::test_background_agent_kwargs_preserves_full_fallback_chain tests/test_tui_gateway_server.py::test_background_agent_kwargs_preserves_empty_fallback_chain -q — 4 passed

Final pre-merge review from Hermes Agent:

• Scope reviewed: tui_gateway/server.py, tests/test_tui_gateway_server.py.
• The change is narrow and preserves configured TUI fallback provider chains during agent construction/background-agent cloning, including explicit empty-chain handling.
• Targeted fallback-chain regression tests cover the affected behavior.
• Local verification on current PR head: 4 targeted TUI fallback tests passed.
• GitHub reports the PR as mergeable and no checks are reported for this fork branch.

Verdict: no blockers found; ready for maintainer merge.

Refreshed against current origin/main after upstream moved forward again.

• Rebased the existing TUI fallback-chain fix onto current origin/main (ddb8d8fa842283ef651a6e4514f8f561f736c72e).
• New PR head: d7ecb282a665b304568e3e86208d3b0c542d43a7.
• Branch state after refresh: 1 commit ahead / 0 behind origin/main.
• Fork/local parity verified after force-with-lease push: 0 ahead / 0 behind.
• GitHub reports mergeable: MERGEABLE.
• GitHub reports no checks.
• Local verification: python -m pytest tests/test_tui_gateway_server.py -q → 178 passed.

No functional scope change intended beyond rebasing the existing fallback-provider-chain fix onto current upstream.

Refreshed against current main.

Current head: 825c3eb495d2b49cb1d8bef96b61b81cd8d26e71
Base: d5416284f11ccbc735c8357f0ab35ce5f683ccc3
GitHub reports: MERGEABLE

Local verification:

• tests/test_tui_gateway_server.py

Result: 181 passed.

No CI checks are reported by GitHub for this PR at the moment.

Refreshed against current origin/main after upstream moved forward.

• Rebased the existing TUI fallback-provider-chain fix onto current origin/main (378bca1d2ff8ffee9158016295d8b44e2cc81d59).
• New PR head: e8cce7f3941e120daa5a3bb4a4c9841e5b987f0c.
• Branch is now 1 commit ahead / 0 behind origin/main.
• Fork/local parity verified after force-with-lease push: 0 ahead / 0 behind.
• GitHub reports mergeable: MERGEABLE (mergeStateStatus: UNSTABLE).
• GitHub reports no checks for this fork branch.

Local verification:

• scripts/run_tests.sh tests/test_tui_gateway_server.py -q -o 'addopts=' → 181 passed
• git diff --check HEAD^..HEAD → OK

No intentional functional scope change beyond refreshing the existing fallback-provider-chain fix onto current upstream.

Refreshed again against latest origin/main after upstream advanced to include #23854.

• Rebased onto current origin/main (2ef501e1f5a9530435b7db5e334f00747b1e7b8f).
• New PR head: 4814d9cd371a6fcdf4385105b1459fc25f5a3d80.
• Fork/local parity verified after force-with-lease push: 0 ahead / 0 behind.

Local verification:

• python -m pytest tests/test_tui_gateway_server.py -q -o 'addopts=' → 181 passed

No intentional functional scope change beyond refreshing the existing TUI fallback-provider-chain fix onto current upstream.

Maintainer handoff / refresh status:

• Refreshed on current main.
• Base: 8f19485f538565630a35d992b06324f308f80630
• Head: 67b51acbb59e49deeb2b8510c2b664a8d6c9e027
• GitHub reports: MERGEABLE
• GitHub checks are complete: 21 total, 18 success, 3 skipped, 0 pending, 0 failed.
• Local targeted verification after refresh:
  • tests/test_tui_gateway_server.py: 186 passed
  • targeted fallback/upstream-drift checks: 6 passed

No further action needed from my side unless main moves again before merge.

Refreshed this PR onto current upstream main.

Verification:

• Base: f05a47309ec8842387e88eab856df55c6910b57b
• Head: 4f0b53441d60e8177fd2f3f36c52a0f15c7a36d1
• Local branch is 1 commit ahead / 0 behind origin/main
• Fork/local parity after push: 0 0
• GitHub mergeability: MERGEABLE
• GitHub checks: 18 passed, 3 skipped, 0 pending, 0 failed
• Local targeted tests: PYTHONPATH=$WT .venv/bin/python -m pytest -o addopts='' tests/test_tui_gateway_server.py -q → 186 passed

Note: an initial CI run hit an unrelated transient Chrome/browser-supervisor timeout in tests/tools/test_browser_supervisor.py; the branch was no-op amended to retrigger CI, and the fresh run is green. No functional scope change beyond the rebase/refresh.

Merged via #42625. Your commit was cherry-picked onto current main with your authorship preserved in git log (4b073d0). A small follow-up on top swaps the loader for the shared get_fallback_chain() helper so the TUI path matches CLI/gateway parity exactly. Thanks for the fix!