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+# AGENTS.md - SCL Language Server (Unified)
+
+This is a unified Neovim/LazyVim plugin for Siemens SCL language support.
+
+## Project Overview
+
+The unified `scl_lsp` project provides:
+- **LSP Server** - Language Server Protocol implementation
+- **Linter** - Diagnostics and code validation
+- **Formatter** - Document formatting
+- **Syntax Highlighting** - Tree-sitter based
+- **Auto-completion** - blink.cmp integration
+- **Auto-prefix** - Automatic `#` prefixing for variables
+
+## Project Structure
+
+```
+scl_lsp/
+├── src/                        # LSP server implementation
+│   ├── main.lua               # Entry point, protocol handling
+│   ├── parser.lua             # Regex-based SCL parser
+│   ├── treesitter.lua        # Tree-sitter integration
+│   ├── diagnostics.lua       # Linter diagnostics
+│   ├── formatter.lua         # Document formatter
+│   ├── json.lua              # JSON encoder/decoder
+│   └── plc_json.lua          # External UDT loading
+├── lua/
+│   ├── scl/                  # Neovim plugin modules (from scl_syntax_nvim)
+│   │   ├── init.lua
+│   │   ├── auto_prefix.lua
+│   │   ├── blink_cmp_source.lua
+│   │   ├── fb_parser.lua
+│   │   ├── udt_parser.lua
+│   │   ├── variables.lua
+│   │   └── workspace_types.lua
+│   └── scl_lsp/
+│       ├── init.lua          # Unified plugin setup
+│       └── plugins/
+│           └── scl.lua       # LazyVim plugin spec
+├── queries/                  # Tree-sitter queries
+│   ├── highlights.scm
+│   ├── indents.scm
+│   ├── folds.scm
+│   ├── locals.scm
+│   └── tags.scm
+├── grammar.js                # Tree-sitter grammar
+└── tree-sitter.json         # Parser config
+```
+
+## Development
+
+### Running the LSP Server
+
+```bash
+# Direct execution
+lua src/main.lua
+
+# Via shell script
+./scl_lsp.sh
+
+# With test mode
+lua src/main.lua --test
+```
+
+### Testing
+
+```bash
+# Tree-sitter parser
+npm test
+tree-sitter generate
+
+# Test file parsing
+tree-sitter parse corpus/test/main_org_block.scl
+```
+
+### Key Patterns
+
+- **LSP Protocol**: JSON-RPC over stdin/stdout in `src/main.lua`
+- **Diagnostics**: `src/diagnostics.lua` - validates SCL code
+- **Formatter**: `src/formatter.lua` - formats SCL documents
+- **Syntax**: Tree-sitter queries in `queries/`
+- **Plugin Setup**: `lua/scl_lsp/init.lua` - LazyVim integration
+
+## Configuration
+
+See `README.md` for configuration options and usage.