# NousResearch/hermes-agent · Sticky routing bug causing poor prompt cache hit rates

## Open now

- Nothing open on GitHub.

A bug in Nous Portal caused sticky routing to use incorrect keys, resulting in prompt cache misses and significantly higher costs for Anthropic models. The fixes address routing key stabilization and a related lock-holder issue on Windows.

## TL;DR

- 3 member(s): 0 open issue(s), 1 closed issue(s), 0 open PR(s), 0 merged PR(s), 2 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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.

## Closed / duplicate issues

- #71576: \[Bug\]: Nous Portal does not apply provider sticky routing for Anthropic models — prompt caches are written but never read (39% vs 100% hit rate, ~2.3x cost)

## Prior & competing PRs

- **#71708: fix(nous-portal): key sticky routing on the lineage root, not the segment**. closed without merge
  - maintainer direction: category `silent_close`; implication `active`
- **#71747: fix(nous-portal,compression-lock): stabilize Hermes's sticky-routing key + reclaim crashed lock holders on Windows**. closed without merge
  - maintainer direction: category `superseded_by_pr`; implication `superseded`

## Fix status

- No merged fix on record.