| name | restart-lsp |
| description | Restart the C# language server when it is misbehaving — stale cache after branch switches, missing symbols, broken go-to-definition. Use when the user says the LSP is stuck, wrong, or slow, or when IntelliSense stops resolving correctly after a branch change. |
| user-invocable | true |
| disable-model-invocation | false |
| allowed-tools | ["Bash(pkill *)","Bash(rm -rf *)","Bash(ps *)","Bash(find *)"] |
/restart-lsp — Restart the C# Language Server
Kills the running C# language server process and wipes the Roslyn/OmniSharp disk cache so
Claude Code restarts it fresh. Cache is cleared by default — use --fast to skip it.
Arguments passed: $ARGUMENTS
Dispatch on arguments
Parse $ARGUMENTS. Supported flags:
- (no args) — wipe caches and kill the language server (full restart)
--fast — kill the language server only, skip cache wipe
Steps
1. Find the language server process
Run:
ps aux | grep -E 'Microsoft\.CodeAnalysis\.LanguageServer|OmniSharp' | grep -v grep
Report what you find (process name + PID). If nothing is found, tell the user
"No C# language server process found — it may already be stopped or not yet started."
and stop.
2. Unless --fast was passed — wipe caches
Wipe the following locations only if they exist (check first, never error on missing paths):
~/.local/share/Microsoft/Microsoft.CodeAnalysis.LanguageServer/ — Roslyn LSP cache~/.omnisharp/ — OmniSharp cache- Any
.roslyn/ directory under the current project root
Report each path removed.
3. Kill the language server
pkill -f 'Microsoft\.CodeAnalysis\.LanguageServer'
pkill -f 'OmniSharp'
Report how many processes were killed.
4. Confirm
Tell the user:
- What was killed
- Whether cache was cleared (and which paths)
- That Claude Code will restart the language server automatically on the next LSP operation
Notes
- Do not kill generic
dotnet processes — only target the named language server binaries.
- The user most commonly needs this after switching branches or rebasing, when Roslyn's
in-memory index drifts from the actual source tree.
--fast skips the cache wipe for a quicker bounce when the index is known to be good.
