# NousResearch/hermes-agent · Context compressor index clamping and bounds fixes

## Open now

- Nothing open on GitHub.

These issues and pull requests address out-of-range index errors in the context compressor, focusing on clamping tail-cut and summary-scan boundaries to prevent IndexError conditions. Related fixes also touch failure cooldown persistence and query/token handling within the compression logic.

## TL;DR

- 4 member(s): 0 open issue(s), 1 closed issue(s), 0 open PR(s), 1 merged PR(s), 2 PR(s) closed without merging.
- A fix was merged to main in PR #75884. Verify it addresses your case.
- **Recommended:** read PR #75884 (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-75884`. 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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 `0.50`: 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

- #75588: \[Bug\] Short tool-only suffix can make context compressor scan past messages

## Prior & competing PRs

- **#75884: fix(compression): index clamps, persisted failure cooldown, user-query preservation, thinking-token estimates**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `agent/context_compressor.py`, `agent/model_metadata.py`, `contributors/emails/[redacted:email]`, `gateway/run.py`, `tests/agent/test_budget_reasoning_details_exclusion.py`, `tests/agent/test_compressor_tail_cut_oob_fix.py`, `tests/agent/test_compressor_zero_user_guard.py`, `tests/gateway/test_session_hygiene.py`
- **#75604: fix(agent): clamp tail-cut boundary and summary-scan indices to prevent IndexError**. closed without merge
  - maintainer direction: category `merged_via`; implication `superseded`; refs `#75884`, `#75588`
- **#75635: fix(context-compressor): clamp out-of-range tail-cut and summary-scan bounds (#75588)**. closed without merge
  - maintainer direction: category `duplicate_of`; implication `duplicate`; refs `#75604`, `#75588`

## Fix status

- Merged to main in PR #75884 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-08-01`.