# NousResearch/hermes-agent · Compression wedge bug with oversized session history

## Open now

- Nothing open on GitHub.

These items address a bug where compression stalls on long tool-only or oversized sessions because the assistant tail anchor is unbounded, causing middle_window_tokens to stay at zero and leaving no compressible history.

## TL;DR

- 3 member(s): 0 open issue(s), 1 closed issue(s), 0 open PR(s), 1 merged PR(s), 1 PR(s) closed without merging.
- A fix was merged to main in PR #132160. Verify it addresses your case.
- **Recommended:** read PR #132160 (and any competing PRs below) before filing. Confirm the merged change covers your symptom.

## Maintainer resolution verdict

- Internal-tracker verdict over this cluster's issue members: `resolved` · deciding PR(s): `pr-132160`. This is distinct from the fix status above. Weigh it yourself.

## How this cluster was grouped

- Link evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.
- Pairwise link density `0.67`: the share of member pairs that carry a link, counting a structural link in full and a relevance-only link at 0.36. `1.00` means every pair is linked.

## Closed / duplicate issues

- #131412: \[Bug\]: \[Bug\]: Current main cannot compact oversized openai-codex session — middle_window_tokens stays 0 and protected tail consumes all compressible history

## Prior & competing PRs

- **#132160: Compression no longer wedges on a long tool-only turn (#131412, salvage #131445)**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `agent/context_compressor.py`, `tests/agent/test_split_turn_compaction.py`
- **#131445: fix(compression): bound the assistant tail anchor by the soft ceiling (#131412)**. closed without merge
  - maintainer direction: category `merged_via`; implication `superseded`; refs `bd0affe5e5`, `#131412`, `#29824`

## Fix status

- Merged to main in PR #132160 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-10-03`.