# NousResearch/hermes-agent · Fix concurrent first-turn session interleaving bug

## Open now

- Nothing open on GitHub.

A bug where concurrent API requests on a new session ID caused turns to interleave incorrectly (resulting in lost responses) was identified and addressed by acquiring a turn lease before reading session state.

## 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 #126309. Verify it addresses your case.
- **Recommended:** read PR #126309 (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-126309`. 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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

- #125124: \[Bug\]: concurrent API requests on a new session id interleave their turns (user, user, assistant, assistant; one answer lost)

## Prior & competing PRs

- **#126309: fix(agent): concurrent API requests on a new session id no longer interleave their turns (#125124, salvage #125125)**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `agent/turn_facade_lease.py`, `tests/agent/test_cross_process_turn_lease.py`, `tests/agent/test_turn_facade_lease.py`
- **#125125: fix(agent): the first turn on a new session id takes the turn lease too**. closed without merge
  - maintainer direction: category `implemented_elsewhere`; implication `superseded`; refs `f06c354bc120d687df14cc48b6f0a136cf495f27`, `29625ef05277be8eee6dcc8225e30c6b1ddb4459`, `41755854adfd96e2871badefdec7993f62324481`, `dd3ba4b4b8d6dd8cd85d1ba64d42d7e5f516a068`, `e63b6fa197e7a941ba5a51d0a0e90d7b7ab136fc`, `#84235`, `#125199`
- **#125199: fix(agent): acquire first-turn lease before reading session state**. closed without merge
  - maintainer direction: category `implemented_elsewhere`; implication `superseded`; refs `66a0f47fd7`, `057bbb3fb9`, `6c1f0bc3c8`, `d9b456ed00`, `#126309`, `#125125`

## Fix status

- Merged to main in PR #126309 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-09-28`.