# NousResearch/hermes-agent · Message reactions failing after session compression

## Open now

- Nothing open on GitHub.

These items concern a bug where reacting to messages fails after auto-compression rotates or changes the session ID, and efforts to fix reaction lookup across the compression lineage.

## 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 #115321. Verify it addresses your case.
- **Recommended:** read PR #115321 (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: `unresolved`. 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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

- #108633: message.react fails with 'message not found in this session' after auto-compression rotates the session id

## Prior & competing PRs

- **#115321: Desktop: reacting to a pre-compaction message no longer fails with 4040 (#80670, salvage #95833 + #108542)**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `apps/desktop/src/store/reactions.ts`, `contributors/emails/[redacted:email]`, `hermes_state_messages.py`, `tests/agent/test_message_reactions.py`, `tests/hermes_state/test_compacted_message_reactions.py`
- **#108635: fix: resolve reactions across compression lineage**. closed without merge
  - maintainer direction: category `superseded_by_pr`; implication `superseded`; refs `#115321`, `#108633`, `#80670`

## Fix status

- Merged to main in PR #115321 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-09-18`.