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hemx/work/slices/SLICE-0009-lsp-protocol-contract.md
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slhx agent df0fabd4fb docs(work): map testing and editor northstars
Add repo-local northstars and ready slices for testing strategy, LSP/editor completion, and hemplate highlighting boundaries.
2026-06-25 22:20:50 +02:00

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---
id: SLICE-0009
type: slice
status: ready
parent: NS-0002
title: Harden LSP protocol behavior
refs:
- hemx-lsp/src/main.rs
- docs/editor-support.md
- REQUIREMENTS.md
---
## Objective
Make `hemx-lsp` predictable as an LSP server: initialize capabilities, document sync, completion, hover, diagnostics, shutdown, and unknown request errors should have focused protocol tests.
## Authority
`hemx-lsp/src/main.rs` implements the protocol loop; `docs/editor-support.md` names the editor-facing command surface.
## Close when
- Tests cover `initialize`, `didOpen`, `didChange`, `didSave`, `didClose`, `completion`, `hover`, `shutdown`, and unknown requests.
- The tests assert JSON-RPC framing and response IDs, not just helper functions.
- The server keeps normal HTML/tree-sitter tooling assumptions and does not add editor-provider policy.
## Verification
- `cargo test -p hemx-lsp`
- `cargo run -p hemx-lsp -- help`
## Non-goals
- Do not add async runtime or background watchers unless protocol tests prove sync IO is insufficient.
- Do not publish editor extensions in this slice.
## Evidence
The current LSP loop is small and testable through in-memory readers/writers.