# NousResearch/hermes-agent · Hybrid BM25 and vector search for session history

## Open now

- 1 issue, 1 PR open on GitHub.
- #44075: Feature: Semantic Search for Session History (Hybrid BM25 + Vector)
- PR #44093: feat(session_search): hybrid semantic search (BM25 + sqlite-vec vectors)

All three members propose adding semantic or hybrid search to session search, combining BM25 keyword ranking with vector similarity, with two naming sqlite-vec. The titles don't show implementation details or status.

## TL;DR

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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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

- #44075: Feature: Semantic Search for Session History (Hybrid BM25 + Vector)

## Prior & competing PRs

- **#44093: feat(session_search): hybrid semantic search (BM25 + sqlite-vec vectors)**. open
  - maintainer direction: category `superseded_by_pr`; implication `superseded`; refs `#51125`
  - files: `hermes_cli/config.py`, `hermes_state.py`, `pyproject.toml`, `scripts/backfill_session_embeddings.py`, `tests/test_project_metadata.py`, `tests/tools/test_session_semantic.py`, `tools/lazy_deps.py`, `tools/session_search_tool.py`, `tools/session_semantic.py`
- **#51125: feat(session_search): semantic/hybrid search with sqlite-vec**. closed without merge
  - maintainer direction: category `superseded_by_pr`; implication `superseded`; refs `#44093`

## Fix status

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