openclaw/lsp

LSP Code Navigation

Multi-language LSP client that manages per-language background daemons. Auto-detects the language from file extension and routes queries to the correct server. Each server lazy-starts on first use and idles out after 5 minutes of inactivity.

Use this instead of grep/read when you need to:

• Find where something is defined
• Find all usages of a symbol
• Get type signatures or docstrings
• List all classes/functions in a file
• Check for type errors before running code
• Search for a symbol across an entire workspace

Supported Languages

| Language | Server | Extensions | Install | |----------|--------|------------|---------| | Python | pyright-langserver | .py, .pyi, .pyx | npm install -g pyright | | TypeScript/JS | typescript-language-server | .ts, .tsx, .js, .jsx, .mjs, .cjs | npm install -g typescript-language-server typescript | | Rust | rust-analyzer | .rs | rustup component add rust-analyzer | | Go | gopls | .go | go install golang.org/x/tools/gopls@latest | | C/C++ | clangd | .c, .h, .cpp, .cc, .hpp | apt install clangd or brew install llvm | | Bash | bash-language-server | .sh, .bash, .zsh | npm install -g bash-language-server | | Java | jdtls | .java | eclipse.jdt.ls | | CSS | vscode-css-language-server | .css, .scss, .less | npm install -g vscode-langservers-extracted | | HTML | vscode-html-language-server | .html, .htm | npm install -g vscode-langservers-extracted | | JSON | vscode-json-language-server | .json, .jsonc | npm install -g vscode-langservers-extracted |

Only install the servers you need. The skill auto-detects which are available and reports helpful install commands for missing ones.

Setup

Prerequisites

• Python 3.10+ (for the client script itself -- stdlib only, no pip deps)
• At least one language server installed (see table above)

Installation

The skill includes a Python script at {baseDir}/scripts/lsp-query.py. This is the LSP client -- it manages background daemons and handles all queries.

To make it callable as lsp-query from anywhere, symlink it into your PATH:

ln -sf {baseDir}/scripts/lsp-query.py /usr/local/bin/lsp-query
# or:
ln -sf {baseDir}/scripts/lsp-query.py ~/.npm-global/bin/lsp-query

Alternatively, invoke it directly:

{baseDir}/scripts/lsp-query.py <command> [args...]

Configuration

Set LSP_WORKSPACE to the repo root before querying. If unset, defaults to the git root or cwd.

Commands

All line and column numbers are 1-indexed (human-friendly, matching editor display).

Go to Definition

lsp-query definition /path/to/file.py <line> <col>

Find References

lsp-query references /path/to/file.py <line> <col>

Hover (Type Info)

lsp-query hover /path/to/file.py <line> <col>

Document Symbols

lsp-query symbols /path/to/file.py

Workspace Symbol Search

lsp-query workspace-symbols "ClassName"

Diagnostics

lsp-query diagnostics /path/to/file.py

Completions

lsp-query completions /path/to/file.py <line> <col>

Signature Help

lsp-query signature /path/to/file.py <line> <col>

Rename Preview

lsp-query rename /path/to/file.py <line> <col> new_name

Server Management

lsp-query languages                    # Show all supported languages + install status
lsp-query servers                      # List running language daemons
lsp-query shutdown                     # Stop all daemons
lsp-query shutdown python              # Stop just the Python daemon

What's Included

{baseDir}/
├── SKILL.md              # This file
└── scripts/
    └── lsp-query.py      # Python script -- multi-language LSP client + daemon manager

lsp-query.py is a self-contained Python script (~850 lines, stdlib only, no pip dependencies). It:

1. Forks a single background daemon process on first use
2. The daemon lazy-starts language servers as needed (e.g., pyright for .py, typescript-language-server for .ts)
3. Communicates with the daemon over a Unix socket (~/.cache/lsp-query/daemon.sock)
4. Translates CLI commands into LSP JSON-RPC requests and prints human-readable results
5. Each language server auto-stops after 5 minutes idle; the daemon itself stops when all servers are idle

Environment Variables

| Variable | Default | Description | |----------|---------|-------------| | LSP_WORKSPACE | git root or cwd | Workspace root for LSP servers | | LSP_SERVER | auto per language | Override server command for ALL languages | | LSP_LANG | auto from extension | Force a specific language (bypass detection) | | LSP_TIMEOUT | 300 | Server idle timeout in seconds | | LSP_SOCK | ~/.cache/lsp-query/daemon.sock | Unix socket path |

Examples

export LSP_WORKSPACE=/path/to/repo

# Python
lsp-query symbols src/model.py
lsp-query hover src/model.py 42 10
lsp-query references src/model.py 42 10

# TypeScript (auto-detected from .ts extension)
lsp-query symbols src/index.ts
lsp-query definition src/app.tsx 15 8

# Rust
lsp-query symbols src/main.rs
lsp-query diagnostics src/lib.rs

# Check what's available
lsp-query languages
lsp-query servers

Troubleshooting

• "Server not found for X": The language server binary isn't installed. The error message includes the install command.
• "could not connect to LSP daemon": Daemon failed to start. Verify Python 3.10+ is available.
• Import errors in diagnostics: Expected when packages aren't installed in the current Python environment. These resolve on machines with the correct venv.
• Stale results: Run lsp-query shutdown to restart all servers fresh.
• Slow first query per language: Each server takes 1-2 seconds to cold-start. Subsequent queries to the same language are ~200ms.
• Wrong language detected: Use LSP_LANG=rust lsp-query symbols myfile to force.