# NousResearch/hermes-agent · Thread safety fixes for model metadata global caches

## Open now

- 1 issue, 2 PRs open on GitHub.
- #8039: Bug: thread-unsafe global mutable caches in model_metadata.py cause data races under gateway concurrency
- PR #8068: fix: add threading.Lock to model metadata global caches
- PR #8074: fix: add threading locks to model metadata caches

These items address thread-unsafe global mutable caches in model_metadata.py that can cause data races under concurrent access. The proposed fixes involve adding threading locks to protect those shared caches.

## TL;DR

- 3 member(s): 1 open issue(s), 0 closed issue(s), 2 open PR(s), 0 merged PR(s), 0 PR(s) closed without merging.
- No fix has been merged to main; one or more PRs were attempted (see below).
- **Recommended:** review the prior/competing PR(s) below. A fix was attempted but not merged; your case may extend or revive that work.

## 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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.

## Open related issues

- #8039: Bug: thread-unsafe global mutable caches in model_metadata.py cause data races under gateway concurrency

## Prior & competing PRs

- **#8068: fix: add threading.Lock to model metadata global caches**. open
  - maintainer direction: category `duplicate_of`; implication `duplicate`; refs `#8074`, `#8039`
  - files: `agent/model_metadata.py`, `tests/agent/test_model_metadata_thread_safety.py`
- **#8074: fix: add threading locks to model metadata caches**. open
  - maintainer direction: category `duplicate_of`; implication `duplicate`; refs `#8068`, `#8039`
  - files: `agent/model_metadata.py`, `agent/models_dev.py`, `tests/agent/test_model_metadata.py`

## Fix status

- No merged fix on record.
- Subsystem: `agent`