New local TUI sessions in 0.155 request detailed reasoning summaries by
default, which causes request rejection on providers that do not support
reasoning summaries. Restore `none` as the default while honoring
explicit `auto`, `concise`, and `detailed` settings and concurrent
delivery when summaries are explicitly enabled.
This focused backport targets `release/0.155`, based on the content
commit for `rust-v0.155.0`. It includes regression coverage for
new-thread settings and the outbound Responses request.
Validation:
- Patch applies cleanly to the 0.155 release source; `git diff --check`
passes.
- All 9 focused reasoning-default and reasoning-status tests passed,
including the outbound Responses request and existing snapshots.
- `just fmt` completed; the hotfix Rust files were unchanged. Unrelated
justfile rewrites from the locally installed formatter were discarded.
- All 4,589 non-ignored TUI tests passed across the rerun and a
follow-up of the remaining 196 tests after a runner disconnection. The
earlier cursor failures were caused by `NO_COLOR=1` / `TERM=dumb`; the
tests pass with normal terminal settings and no code or snapshot
changes.
- Release-build checks passed on Linux, macOS, and Windows.
CI currently reports failures in unchanged release-base files:
-
[Codespell](https://github.com/openai/codex/actions/runs/35380630185/job/105715678757)
flags the existing `OFlags::WRONLY` identifier.
- [Manifest
validation](https://github.com/openai/codex/actions/runs/35380630185/job/105715679235)
finds a stale feature exception for `codex-rs/code-mode/Cargo.toml`.
- [Dependency
audit](https://github.com/openai/codex/actions/runs/35380630185/job/105715679009)
reports RUSTSEC-2026-0285 for the existing `rustls 0.23.36` lockfile
entry.
- [cargo
shear](https://github.com/openai/codex/actions/runs/35380630185/job/105716110806)
reports an existing unlinked file,
`codex-rs/login/src/internal_identity.rs`.
Additional CI failures are also outside the changed TUI files: an unused
`body_json` import in `core/tests/suite/openai_file_mcp.rs` (Bazel
Clippy), a format-driver expectation in the Python SDK tests, and a
transient `Text file busy` error while spawning a code-mode test helper
(musl). These paths are unchanged from the release base.
Celia Chen
5e0d1ef83e