The Codex gpt-5.5 compaction autoraise (#40957) overrode the effective
threshold unconditionally. If a user had set compression.threshold above
0.85, agent_init dropped them down to 0.85. That wastes usable window and
contradicts the feature's whole point: use more of the context, not less.
It happened silently too, since the one-time notice is suppressed when the
override doesn't raise.
The override is an autoraise. It must only raise. Pulled the apply logic
into a small pure helper that clamps the Codex case to never lower a
higher-or-equal user threshold, and emits the notice only when it actually
fires. Other overrides (Arcee Trinity) keep their existing unconditional
behavior.
Fixes the Codex gpt-5.5 compaction autoraise lowering a user's higher
configured threshold. A user on the Codex OAuth route with
compression.threshold > 0.85 was silently clamped to 0.85, compacting
earlier than they asked and using less of the 272K window the feature was
meant to unlock. The autoraise now only ever raises.
N/A
- [x] 🐛 Bug fix (non-breaking change that fixes an issue)
- [ ] ✨ New feature (non-breaking change that adds functionality)
- [ ] 🔒 Security fix
- [ ] 📝 Documentation update
- [ ] ✅ Tests (adding or improving test coverage)
- [ ] ♻️ Refactor (no behavior change)
- [ ] 🎯 New skill (bundled or hub)
- `agent/agent_init.py`: added `_resolve_compression_threshold()`, a pure
helper that combines the global threshold with a per-model override. The
Codex gpt-5.5 autoraise never lowers a higher-or-equal user threshold;
the notice is returned only when it actually raises. Rewired `init_agent`
to call it, replacing the unconditional `compression_threshold = _model_cthresh`.
- `tests/agent/test_arcee_trinity_overrides.py`: added 5 cases for the
helper — raise from default, never-lower regression, equal-is-noop,
no-override passthrough, and non-codex (Trinity) unconditional apply.
1. Set `compression.threshold: 0.90` and run gpt-5.5 on provider `openai-codex`.
2. Before: effective threshold drops to 0.85, no notice. After: stays 0.90.
3. Run `scripts/run_tests.sh tests/agent/test_arcee_trinity_overrides.py`.
Stash `agent/agent_init.py` and the new cases fail; restore and they pass.
- [x] I've read the [Contributing Guide](https://github.com/NousResearch/hermes-agent/blob/main/CONTRIBUTING.md)
- [x] My commit messages follow [Conventional Commits](https://www.conventionalcommits.org/) (`fix(scope):`, `feat(scope):`, etc.)
- [x] I searched for [existing PRs](https://github.com/NousResearch/hermes-agent/pulls) to make sure this isn't a duplicate
- [x] My PR contains **only** changes related to this fix/feature (no unrelated commits)
- [x] I've run `pytest tests/ -q` and all tests pass
- [x] I've added tests for my changes (required for bug fixes, strongly encouraged for features)
- [x] I've tested on my platform: macOS 15 (Darwin 25.5)
- [x] I've updated relevant documentation (README, `docs/`, docstrings) — or N/A
- [x] I've updated `cli-config.yaml.example` if I added/changed config keys — or N/A
- [x] I've updated `CONTRIBUTING.md` or `AGENTS.md` if I changed architecture or workflows — or N/A
- [x] I've considered cross-platform impact (Windows, macOS) per the [compatibility guide](https://github.com/NousResearch/hermes-agent/blob/main/CONTRIBUTING.md#cross-platform-compatibility) — or N/A
- [x] I've updated tool descriptions/schemas if I changed tool behavior — or N/A
gpt-5.3-codex-spark has a native 128K context window but the default
50% compaction trigger fires at ~64K, wasting half the usable window
before the session has accumulated enough turns to summarize
meaningfully. This raises the trigger to 70% (~90K) on the Codex OAuth
route only, leaving ~38K headroom for the summary and continued
conversation before the 128K hard limit.
The override is not gated by allow_codex_gpt55_autoraise because 128K
is the model's native window (unlike gpt-5.5's artificial 272K Codex
cap). Non-Codex routes are unaffected.
Also adds a boundary regression test verifying the short-session
scenario from the issue always yields a non-empty compressible window
(no silent context wipe).
The ChatGPT Codex OAuth backend caps both gpt-5.4 and gpt-5.5 at a 272K
context window, but the autoraise that lifts the compaction trigger to 85%
only matched gpt-5.5. On gpt-5.4 the global 50% threshold fired at ~136K —
half the usable window — compacting far earlier than necessary.
Rename _is_codex_gpt55 -> _is_codex_gpt54_or_gpt55 and match both families.
The one-time user notice is now model-aware (shows the actual slug). The
config key codex_gpt55_autoraise is kept as-is for backward compatibility.
Adds gpt-5.4 coverage to the autoraise tests.
The ChatGPT Codex OAuth backend hard-caps gpt-5.5 at a 272K context window
(verified live: a ~330K-token request to chatgpt.com/backend-api/codex/responses
is rejected with context_length_exceeded while ~250K succeeds; the same slug
exposes 1.05M on the direct OpenAI API / OpenRouter and 400K on Copilot). At the
default 50% trigger, auto-compaction fires at ~136K — half the usable window.
Raise the trigger to 85% (~231K) on this exact route only, gated by a new
compression.codex_gpt55_autoraise config flag (default true). When it fires,
emit a one-time notice (CLI inline print + gateway status_callback replay) with
the exact opt-back-out command. gpt-5.5 on any other provider keeps the user's
global threshold.
- _is_codex_gpt55() matches the 5.5 family only on provider=openai-codex
- _compression_threshold_for_model() now provider-aware + opt-out param
- config key + _config_version bump (27->28) for backfill
- docs + tests (40 cases in test_arcee_trinity_overrides.py)
Salvage follow-up for PR #20344:
- AUTHOR_MAP entry for rob-maron (required by CI)
- 17 parametrized tests covering _is_arcee_trinity_thinking,
_fixed_temperature_for_model Trinity override, and
_compression_threshold_for_model, including sibling-model negatives
(trinity-large-preview, trinity-mini) and the OpenRouter slug form.
