# NousResearch/hermes-agent · LSP document sync broken by non-BMP characters

## Open now

- Nothing open on GitHub.

These issues and fixes address a bug where LSP incremental text synchronization produces stale or incorrect document state when the content contains non-BMP (multi-byte) Unicode characters, due to incorrect UTF-16 code unit handling in replacement ranges.

## 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 #116790. Verify it addresses your case.
- **Recommended:** read PR #116790 (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-116790`. 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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

- #116094: bug(lsp): incremental replacements leave stale text after non-BMP characters

## Prior & competing PRs

- **#116790: fix(lsp): incremental servers keep an exact document mirror after non-BMP characters (#116094, salvage #116097)**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `agent/lsp/client.py`, `tests/agent/lsp/_mock_lsp_server.py`, `tests/agent/lsp/test_incremental_unicode.py`
- **#116097: fix(lsp): use UTF-16 units for document replacement ranges**. closed without merge
  - maintainer direction: category `merged_via`; implication `superseded`; refs `d23d6e821876`, `#116790`, `#116094`, `#116097`

## Fix status

- Merged to main in PR #116790 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-09-20`.