diff --git a/Cargo.lock b/Cargo.lock
index 84e5bbf..35e08bf 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -235,6 +235,17 @@ version = "1.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1505bd5d3d116872e7271a6d4e16d81d0c8570876c8de68093a09ac269d8aac0"
 
+[[package]]
+name = "auto_impl"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ffdcb70bdbc4d478427380519163274ac86e52916e10f0a8889adf0f96d3fee7"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "autocfg"
 version = "1.4.0"
@@ -269,7 +280,7 @@ dependencies = [
  "serde_urlencoded",
  "sync_wrapper 1.0.2",
  "tokio",
- "tower",
+ "tower 0.5.2",
  "tower-layer",
  "tower-service",
  "tracing",
@@ -572,6 +583,7 @@ dependencies = [
  "cooklang",
  "cooklang-find 0.5.0",
  "cooklang-import",
+ "cooklang-language-server",
  "cooklang-reports",
  "directories",
  "fluent",
@@ -597,8 +609,9 @@ dependencies = [
  "textwrap",
  "tokio",
  "toml 0.9.5",
- "tower",
+ "tower 0.5.2",
  "tower-http 0.5.2",
+ "tower-lsp",
  "tracing",
  "tracing-subscriber",
  "unic-langid",
@@ -616,10 +629,14 @@ dependencies = [
  "codesnake",
  "enum-map",
  "finl_unicode",
+ "prettyplease",
+ "proc-macro2",
+ "quote",
  "serde",
  "serde_yaml",
  "smallvec",
  "strum",
+ "syn",
  "thiserror 2.0.12",
  "toml 0.8.23",
  "tracing",
@@ -675,6 +692,27 @@ dependencies = [
  "tokio",
 ]
 
+[[package]]
+name = "cooklang-language-server"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5589a2a285d563904cd12348dca1f848c043ec558c5e9cf267746bb0395d077f"
+dependencies = [
+ "anyhow",
+ "cooklang",
+ "dashmap 6.1.0",
+ "nohash-hasher",
+ "ropey",
+ "serde",
+ "serde_json",
+ "text-size",
+ "thiserror 2.0.12",
+ "tokio",
+ "tower-lsp",
+ "tracing",
+ "tracing-subscriber",
+]
+
 [[package]]
 name = "cooklang-reports"
 version = "0.2.0"
@@ -816,6 +854,33 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "dashmap"
+version = "5.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "978747c1d849a7d2ee5e8adc0159961c48fb7e5db2f06af6723b80123bb53856"
+dependencies = [
+ "cfg-if",
+ "hashbrown 0.14.5",
+ "lock_api",
+ "once_cell",
+ "parking_lot_core",
+]
+
+[[package]]
+name = "dashmap"
+version = "6.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5041cc499144891f3790297212f32a74fb938e5136a14943f338ef9e0ae276cf"
+dependencies = [
+ "cfg-if",
+ "crossbeam-utils",
+ "hashbrown 0.14.5",
+ "lock_api",
+ "once_cell",
+ "parking_lot_core",
+]
+
 [[package]]
 name = "der"
 version = "0.7.10"
@@ -1223,6 +1288,20 @@ dependencies = [
  "new_debug_unreachable",
 ]
 
+[[package]]
+name = "futures"
+version = "0.3.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "65bc07b1a8bc7c85c5f2e110c476c7389b4554ba72af57d8445ea63a576b0876"
+dependencies = [
+ "futures-channel",
+ "futures-core",
+ "futures-io",
+ "futures-sink",
+ "futures-task",
+ "futures-util",
+]
+
 [[package]]
 name = "futures-channel"
 version = "0.3.31"
@@ -1245,6 +1324,17 @@ version = "0.3.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9e5c1b78ca4aae1ac06c48a526a655760685149f0d465d21f37abfe57ce075c6"
 
+[[package]]
+name = "futures-macro"
+version = "0.3.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "162ee34ebcb7c64a8abebc059ce0fee27c2262618d7b60ed8faf72fef13c3650"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "futures-sink"
 version = "0.3.31"
@@ -1263,8 +1353,10 @@ version = "0.3.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9fa08315bb612088cc391249efdc3bc77536f16c91f6cf495e6fbe85b20a4a81"
 dependencies = [
+ "futures-channel",
  "futures-core",
  "futures-io",
+ "futures-macro",
  "futures-sink",
  "futures-task",
  "memchr",
@@ -2007,6 +2099,19 @@ version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "112b39cec0b298b6c1999fee3e31427f74f676e4cb9879ed1a121b43661a4154"
 
+[[package]]
+name = "lsp-types"
+version = "0.94.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c66bfd44a06ae10647fe3f8214762e9369fd4248df1350924b4ef9e770a85ea1"
+dependencies = [
+ "bitflags 1.3.2",
+ "serde",
+ "serde_json",
+ "serde_repr",
+ "url",
+]
+
 [[package]]
 name = "mac"
 version = "0.1.1"
@@ -2123,6 +2228,12 @@ version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "650eef8c711430f1a879fdd01d4745a7deea475becfb90269c06775983bbf086"
 
+[[package]]
+name = "nohash-hasher"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2bf50223579dc7cdcfb3bfcacf7069ff68243f8c363f62ffa99cf000a6b9c451"
+
 [[package]]
 name = "nom"
 version = "7.1.3"
@@ -2433,6 +2544,26 @@ dependencies = [
  "siphasher 1.0.1",
 ]
 
+[[package]]
+name = "pin-project"
+version = "1.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "677f1add503faace112b9f1373e43e9e054bfdd22ff1a63c1bc485eaec6a6a8a"
+dependencies = [
+ "pin-project-internal",
+]
+
+[[package]]
+name = "pin-project-internal"
+version = "1.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6e918e4ff8c4549eb882f14b3a4bc8c8bc93de829416eacf579f1207a8fbf861"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "pin-project-lite"
 version = "0.2.16"
@@ -2536,6 +2667,16 @@ dependencies = [
  "termtree",
 ]
 
+[[package]]
+name = "prettyplease"
+version = "0.2.34"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6837b9e10d61f45f987d50808f83d1ee3d206c66acf650c3e4ae2e1f6ddedf55"
+dependencies = [
+ "proc-macro2",
+ "syn",
+]
+
 [[package]]
 name = "proc-macro-hack"
 version = "0.5.20+deprecated"
@@ -2816,7 +2957,7 @@ dependencies = [
  "tokio",
  "tokio-native-tls",
  "tokio-rustls",
- "tower",
+ "tower 0.5.2",
  "tower-http 0.6.4",
  "tower-service",
  "url",
@@ -2852,6 +2993,16 @@ dependencies = [
  "serde_derive",
 ]
 
+[[package]]
+name = "ropey"
+version = "1.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "93411e420bcd1a75ddd1dc3caf18c23155eda2c090631a85af21ba19e97093b5"
+dependencies = [
+ "smallvec",
+ "str_indices",
+]
+
 [[package]]
 name = "rust-embed"
 version = "8.7.2"
@@ -3172,6 +3323,17 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "serde_repr"
+version = "0.1.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "175ee3e80ae9982737ca543e96133087cbd9a485eecc3bc4de9c1a37b47ea59c"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "serde_spanned"
 version = "0.6.9"
@@ -3343,6 +3505,12 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a8f112729512f8e442d81f95a8a7ddf2b7c6b8a1a6f509a95864142b30cab2d3"
 
+[[package]]
+name = "str_indices"
+version = "0.4.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d08889ec5408683408db66ad89e0e1f93dff55c73a4ccc71c427d5b277ee47e6"
+
 [[package]]
 name = "string_cache"
 version = "0.8.9"
@@ -3560,6 +3728,12 @@ version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8f50febec83f5ee1df3015341d8bd429f2d1cc62bcba7ea2076759d315084683"
 
+[[package]]
+name = "text-size"
+version = "1.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f18aa187839b2bdb1ad2fa35ead8c4c2976b64e4363c386d45ac0f7ee85c9233"
+
 [[package]]
 name = "textwrap"
 version = "0.16.2"
@@ -3817,6 +3991,20 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fcc842091f2def52017664b53082ecbbeb5c7731092bad69d2c63050401dfd64"
 
+[[package]]
+name = "tower"
+version = "0.4.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b8fa9be0de6cf49e536ce1851f987bd21a43b771b09473c3549a6c853db37c1c"
+dependencies = [
+ "futures-core",
+ "futures-util",
+ "pin-project",
+ "pin-project-lite",
+ "tower-layer",
+ "tower-service",
+]
+
 [[package]]
 name = "tower"
 version = "0.5.2"
@@ -3871,7 +4059,7 @@ dependencies = [
  "http-body 1.0.1",
  "iri-string",
  "pin-project-lite",
- "tower",
+ "tower 0.5.2",
  "tower-layer",
  "tower-service",
 ]
@@ -3882,6 +4070,40 @@ version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "121c2a6cda46980bb0fcd1647ffaf6cd3fc79a013de288782836f6df9c48780e"
 
+[[package]]
+name = "tower-lsp"
+version = "0.20.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d4ba052b54a6627628d9b3c34c176e7eda8359b7da9acd497b9f20998d118508"
+dependencies = [
+ "async-trait",
+ "auto_impl",
+ "bytes",
+ "dashmap 5.5.3",
+ "futures",
+ "httparse",
+ "lsp-types",
+ "memchr",
+ "serde",
+ "serde_json",
+ "tokio",
+ "tokio-util",
+ "tower 0.4.13",
+ "tower-lsp-macros",
+ "tracing",
+]
+
+[[package]]
+name = "tower-lsp-macros"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "84fd902d4e0b9a4b27f2f440108dc034e1758628a9b702f8ec61ad66355422fa"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "tower-service"
 version = "0.3.3"
@@ -4077,6 +4299,7 @@ dependencies = [
  "form_urlencoded",
  "idna",
  "percent-encoding",
+ "serde",
 ]
 
 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index d21faf7..830d3df 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -39,6 +39,7 @@ clap = { version = "4.5", features = ["derive"] }
 cooklang = { version = "0.17.4", default-features = false, features = ["aisle", "pantry"] }
 cooklang-find = { version = "0.5.0" }
 cooklang-import = "0.8.7"
+cooklang-language-server = "0.1.0"
 cooklang-reports = { version = "0.2" }
 directories = "6"
 fluent = "0.16"
@@ -61,6 +62,7 @@ tokio = { version = "1", features = ["full"] }
 toml = "0.9.5"
 tower = { version = "0.5", features = ["util"] }
 tower-http = { version = "0.5", features = ["fs", "trace", "cors"] }
+tower-lsp = "0.20"
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 unic-langid = "0.9"
diff --git a/docs/lsp.md b/docs/lsp.md
new file mode 100644
index 0000000..9bcdeaa
--- /dev/null
+++ b/docs/lsp.md
@@ -0,0 +1,259 @@
+# LSP Command
+
+The `lsp` command starts a Language Server Protocol (LSP) server for Cooklang recipe files. It enables IDE features in text editors and development environments.
+
+## Overview
+
+The LSP server provides intelligent editing features for `.cook` files:
+
+- **Real-time syntax checking** – Catch errors as you type
+- **Auto-completion** – Suggestions for ingredients, cookware, and timers
+- **Semantic highlighting** – Rich syntax coloring beyond basic highlighting
+- **Hover documentation** – Information about ingredients and references
+- **Document symbols** – Navigate recipe structure quickly
+- **Go to definition** – Jump to referenced recipes
+
+## Basic Usage
+
+Start the LSP server:
+```bash
+cook lsp
+```
+
+The server communicates over stdin/stdout using the standard LSP protocol. You typically don't run this command directly—your editor starts it automatically.
+
+## Editor Integration
+
+### Visual Studio Code
+
+Install the [Cooklang extension](https://marketplace.visualstudio.com/items?itemName=cooklang.cooklang) from the VS Code marketplace. The extension automatically uses `cook lsp` when available.
+
+**Manual Configuration:**
+
+Add to your `settings.json`:
+```json
+{
+  "cooklang.languageServer.path": "cook",
+  "cooklang.languageServer.args": ["lsp"]
+}
+```
+
+### Neovim
+
+Using [nvim-lspconfig](https://github.com/neovim/nvim-lspconfig):
+
+```lua
+local lspconfig = require('lspconfig')
+local configs = require('lspconfig.configs')
+
+if not configs.cooklang then
+  configs.cooklang = {
+    default_config = {
+      cmd = { 'cook', 'lsp' },
+      filetypes = { 'cooklang' },
+      root_dir = lspconfig.util.root_pattern('.git', 'config'),
+      settings = {},
+    },
+  }
+end
+
+lspconfig.cooklang.setup{}
+```
+
+### Vim with CoC
+
+Add to your `coc-settings.json`:
+```json
+{
+  "languageserver": {
+    "cooklang": {
+      "command": "cook",
+      "args": ["lsp"],
+      "filetypes": ["cooklang"],
+      "rootPatterns": [".git", "config"]
+    }
+  }
+}
+```
+
+### Emacs
+
+Using [lsp-mode](https://emacs-lsp.github.io/lsp-mode/):
+
+```elisp
+(with-eval-after-load 'lsp-mode
+  (add-to-list 'lsp-language-id-configuration
+    '(cooklang-mode . "cooklang"))
+
+  (lsp-register-client
+    (make-lsp-client
+      :new-connection (lsp-stdio-connection '("cook" "lsp"))
+      :activation-fn (lsp-activate-on "cooklang")
+      :server-id 'cooklang-lsp)))
+```
+
+Using [eglot](https://github.com/joaotavora/eglot):
+
+```elisp
+(add-to-list 'eglot-server-programs
+  '(cooklang-mode . ("cook" "lsp")))
+```
+
+### Helix
+
+Add to your `languages.toml`:
+```toml
+[[language]]
+name = "cooklang"
+scope = "source.cooklang"
+file-types = ["cook"]
+language-servers = ["cooklang-lsp"]
+
+[language-server.cooklang-lsp]
+command = "cook"
+args = ["lsp"]
+```
+
+### Sublime Text
+
+Using [LSP package](https://github.com/sublimelsp/LSP):
+
+Add to LSP settings:
+```json
+{
+  "clients": {
+    "cooklang": {
+      "enabled": true,
+      "command": ["cook", "lsp"],
+      "selector": "source.cooklang"
+    }
+  }
+}
+```
+
+### Zed
+
+Add to your `settings.json`:
+```json
+{
+  "lsp": {
+    "cooklang": {
+      "binary": {
+        "path": "cook",
+        "arguments": ["lsp"]
+      }
+    }
+  }
+}
+```
+
+## Features
+
+### Diagnostics
+
+The LSP server reports syntax errors and warnings in real-time:
+
+```
+Line 5: Invalid ingredient syntax - missing quantity
+Line 8: Timer format should be ~{time%unit}
+Line 12: Referenced recipe not found: ./Missing Recipe.cook
+```
+
+### Completions
+
+Auto-completion triggers in various contexts:
+
+- **Ingredients** – After typing `@`, suggests known ingredients
+- **Cookware** – After typing `#`, suggests equipment
+- **Timers** – After typing `~`, suggests time formats
+- **References** – Suggests recipe files for `@./` paths
+- **Metadata** – Suggests common metadata keys in frontmatter
+
+### Hover Information
+
+Hover over elements to see details:
+
+- **Ingredients** – Quantity, unit, and any notes
+- **Timers** – Formatted duration
+- **Recipe references** – Preview of referenced recipe
+- **Metadata** – Description of metadata fields
+
+### Document Symbols
+
+Navigate recipe structure:
+
+- Sections and steps
+- Ingredients list
+- Cookware list
+- Timers
+- Metadata fields
+
+### Semantic Tokens
+
+Enhanced syntax highlighting for:
+
+- Ingredients (with quantity and unit distinction)
+- Cookware
+- Timers
+- Comments
+- Metadata keys and values
+- Recipe references
+
+## Troubleshooting
+
+### Server Not Starting
+
+Verify the cook command is in your PATH:
+```bash
+which cook
+cook --version
+```
+
+### Connection Issues
+
+Check server logs by running manually:
+```bash
+cook lsp 2>/tmp/cooklang-lsp.log
+```
+
+### Editor Not Detecting Server
+
+Ensure your editor:
+1. Recognizes `.cook` files as Cooklang
+2. Has LSP client support enabled
+3. Is configured with the correct command path
+
+### Debugging
+
+Enable verbose logging:
+```bash
+RUST_LOG=debug cook lsp 2>/tmp/cooklang-lsp-debug.log
+```
+
+## Protocol Details
+
+The server implements LSP specification features:
+
+| Feature | Support |
+|---------|---------|
+| textDocument/didOpen | Yes |
+| textDocument/didChange | Yes |
+| textDocument/didClose | Yes |
+| textDocument/completion | Yes |
+| textDocument/hover | Yes |
+| textDocument/definition | Yes |
+| textDocument/documentSymbol | Yes |
+| textDocument/semanticTokens | Yes |
+| textDocument/publishDiagnostics | Yes |
+
+### Transport
+
+- **Protocol**: JSON-RPC 2.0
+- **Transport**: stdin/stdout
+- **Encoding**: UTF-8
+
+## See Also
+
+- [Language Server Protocol Specification](https://microsoft.github.io/language-server-protocol/)
+- [Cooklang Syntax Reference](https://cooklang.org/docs/spec/)
+- [Editor Integrations](https://cooklang.org/cli/editors/)
diff --git a/src/args.rs b/src/args.rs
index d039899..b8d7372 100644
--- a/src/args.rs
+++ b/src/args.rs
@@ -32,7 +32,7 @@ use clap::{Parser, Subcommand};
 
 #[cfg(feature = "self-update")]
 use crate::update;
-use crate::{doctor, import, pantry, recipe, report, search, seed, server, shopping_list};
+use crate::{doctor, import, lsp, pantry, recipe, report, search, seed, server, shopping_list};
 
 #[derive(Parser, Debug)]
 #[command(
@@ -193,6 +193,26 @@ pub enum Command {
     )]
     Pantry(pantry::PantryArgs),
 
+    /// Start the Cooklang Language Server Protocol (LSP) server
+    ///
+    /// Launches an LSP server that provides IDE features for Cooklang recipe files.
+    /// The server communicates over stdin/stdout using the standard LSP protocol,
+    /// enabling integration with editors like VS Code, Neovim, Emacs, and others.
+    ///
+    /// Features include:
+    ///   - Real-time syntax checking and validation
+    ///   - Auto-completion for ingredients, cookware, and timers
+    ///   - Semantic syntax highlighting
+    ///   - Hover documentation
+    ///   - Document symbols and navigation
+    ///
+    /// Examples:
+    ///   cook lsp                         # Start the LSP server
+    #[command(
+        long_about = "Start the Language Server Protocol server for Cooklang editor integration"
+    )]
+    Lsp(lsp::LspArgs),
+
     /// Update CookCLI to the latest version
     ///
     /// Checks for new releases on GitHub and automatically downloads and
diff --git a/src/lib.rs b/src/lib.rs
index ec79a82..57cb582 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -4,6 +4,7 @@ use camino::Utf8PathBuf;
 // Commands - make them available as public modules
 pub mod doctor;
 pub mod import;
+pub mod lsp;
 pub mod pantry;
 pub mod recipe;
 pub mod report;
diff --git a/src/lsp.rs b/src/lsp.rs
new file mode 100644
index 0000000..cb9991d
--- /dev/null
+++ b/src/lsp.rs
@@ -0,0 +1,51 @@
+use anyhow::Result;
+use clap::Args;
+use cooklang_language_server::Backend;
+use tower_lsp::{LspService, Server};
+use tracing::{debug, info};
+
+use crate::Context;
+
+#[derive(Debug, Args)]
+#[command()]
+pub struct LspArgs {}
+
+/// Start the Cooklang Language Server Protocol server.
+///
+/// Note: The LSP server receives workspace configuration from the editor during
+/// the LSP initialization handshake. The editor sends workspace folders, and the
+/// server loads aisle.conf from those locations. The Context paths logged below
+/// are for debugging and future extensibility when the upstream cooklang-language-server
+/// crate supports custom configuration paths.
+#[tokio::main]
+pub async fn run(ctx: &Context, _args: LspArgs) -> Result<()> {
+    info!("Starting Cooklang LSP server");
+
+    // Log available configuration paths for debugging
+    // Currently the LSP server uses workspace paths from the editor,
+    // but these could be used in the future for global config support
+    debug!("Base path: {}", ctx.base_path());
+    if let Some(aisle) = ctx.aisle() {
+        debug!("Aisle config: {}", aisle);
+    }
+    if let Some(pantry) = ctx.pantry() {
+        debug!("Pantry config: {}", pantry);
+    }
+
+    let stdin = tokio::io::stdin();
+    let stdout = tokio::io::stdout();
+
+    let (service, socket) = LspService::new(Backend::new);
+
+    // Use tokio::select! to handle both the LSP server and shutdown signals
+    tokio::select! {
+        _ = Server::new(stdin, stdout, socket).serve(service) => {
+            info!("LSP server stopped");
+        }
+        _ = tokio::signal::ctrl_c() => {
+            info!("Received shutdown signal, stopping LSP server");
+        }
+    }
+
+    Ok(())
+}
diff --git a/src/main.rs b/src/main.rs
index 8d676c5..0981902 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -37,6 +37,7 @@ use clap::Parser;
 // commands
 mod doctor;
 mod import;
+mod lsp;
 mod pantry;
 mod recipe;
 mod report;
@@ -73,6 +74,7 @@ pub fn main() -> Result<()> {
         Command::Report(args) => report::run(&ctx, args),
         Command::Doctor(args) => doctor::run(&ctx, args),
         Command::Pantry(args) => pantry::run(&ctx, args),
+        Command::Lsp(args) => lsp::run(&ctx, args),
         #[cfg(feature = "self-update")]
         Command::Update(args) => update::run(args),
     }
diff --git a/tests/snapshots/snapshot_test__help_output.snap b/tests/snapshots/snapshot_test__help_output.snap
index ae77693..ef61c38 100644
--- a/tests/snapshots/snapshot_test__help_output.snap
+++ b/tests/snapshots/snapshot_test__help_output.snap
@@ -1,5 +1,6 @@
 ---
 source: tests/snapshot_test.rs
+assertion_line: 311
 expression: stdout
 ---
 A command-line interface for managing and working with Cooklang recipes
@@ -16,6 +17,7 @@ Commands:
   report         Generate custom reports from recipes using templates
   doctor         Analyze your recipe collection for issues and improvements
   pantry         Manage and analyze your pantry inventory
+  lsp            Start the Cooklang Language Server Protocol (LSP) server
   update         Update CookCLI to the latest version
   help           Print this message or the help of the given subcommand(s)
 
diff --git a/tests/snapshots/snapshot_test__help_output_no_update.snap b/tests/snapshots/snapshot_test__help_output_no_update.snap
index a5e45af..a991815 100644
--- a/tests/snapshots/snapshot_test__help_output_no_update.snap
+++ b/tests/snapshots/snapshot_test__help_output_no_update.snap
@@ -17,6 +17,7 @@ Commands:
   report         Generate custom reports from recipes using templates
   doctor         Analyze your recipe collection for issues and improvements
   pantry         Manage and analyze your pantry inventory
+  lsp            Start the Cooklang Language Server Protocol (LSP) server
   help           Print this message or the help of the given subcommand(s)
 
 Options:
diff --git a/tests/snapshots/snapshot_test__recipe_human_output.snap b/tests/snapshots/snapshot_test__recipe_human_output.snap
index 11a71e0..b8e4826 100644
--- a/tests/snapshots/snapshot_test__recipe_human_output.snap
+++ b/tests/snapshots/snapshot_test__recipe_human_output.snap
@@ -1,5 +1,6 @@
 ---
 source: tests/snapshot_test.rs
+assertion_line: 24
 expression: stdout
 ---
  Simple Recipe 
@@ -7,9 +8,9 @@ expression: stdout
 servings: 2
 
 Ingredients:
-  pasta      200 g  
-  salt       1 tsp  
-  water      2 cups 
+  pasta      200 g 
+  salt       1 tsp 
+  water      2 c   
 
 Cookware:
   pot      
@@ -17,4 +18,4 @@ Cookware:
 Steps:
  1. Boil water for 5 minutes. Add salt and pasta. Cook in a pot for another
     10 minutes.
-     [water: 2 cups, salt: 1 tsp, pasta: 200 g]
+     [water: 2 c, salt: 1 tsp, pasta: 200 g]
diff --git a/tests/snapshots/snapshot_test__recipe_json_output.snap b/tests/snapshots/snapshot_test__recipe_json_output.snap
index ef39864..a26fe8d 100644
--- a/tests/snapshots/snapshot_test__recipe_json_output.snap
+++ b/tests/snapshots/snapshot_test__recipe_json_output.snap
@@ -1,5 +1,6 @@
 ---
 source: tests/snapshot_test.rs
+assertion_line: 50
 expression: formatted
 ---
 {
@@ -24,8 +25,8 @@ expression: formatted
       "name": "water",
       "note": null,
       "quantity": {
-        "scalable": true,
-        "unit": "cups",
+        "scalable": false,
+        "unit": "c",
         "value": {
           "type": "number",
           "value": {
@@ -50,7 +51,7 @@ expression: formatted
       "name": "salt",
       "note": null,
       "quantity": {
-        "scalable": true,
+        "scalable": false,
         "unit": "tsp",
         "value": {
           "type": "number",
@@ -76,7 +77,7 @@ expression: formatted
       "name": "pasta",
       "note": null,
       "quantity": {
-        "scalable": true,
+        "scalable": false,
         "unit": "g",
         "value": {
           "type": "number",
diff --git a/tests/snapshots/snapshot_test__recipe_markdown_output.snap b/tests/snapshots/snapshot_test__recipe_markdown_output.snap
index b8af99e..5b7db28 100644
--- a/tests/snapshots/snapshot_test__recipe_markdown_output.snap
+++ b/tests/snapshots/snapshot_test__recipe_markdown_output.snap
@@ -1,5 +1,6 @@
 ---
 source: tests/snapshot_test.rs
+assertion_line: 92
 expression: stdout
 ---
 ---
@@ -12,8 +13,8 @@ name: Pancakes
 
 ## Ingredients
 
-- *2 cups* flour
-- *1.5 cups* milk
+- *2 c* flour
+- *1 1/2 c* milk
 - *2* eggs
 - *2 tbsp* sugar
 
diff --git a/tests/snapshots/snapshot_test__recipe_yaml_output.snap b/tests/snapshots/snapshot_test__recipe_yaml_output.snap
index c433568..4798627 100644
--- a/tests/snapshots/snapshot_test__recipe_yaml_output.snap
+++ b/tests/snapshots/snapshot_test__recipe_yaml_output.snap
@@ -1,5 +1,6 @@
 ---
 source: tests/snapshot_test.rs
+assertion_line: 71
 expression: stdout
 ---
 metadata:
@@ -48,8 +49,8 @@ ingredients:
       value:
         type: regular
         value: 2.0
-    unit: cups
-    scalable: true
+    unit: c
+    scalable: false
   note: null
   reference: null
   relation:
@@ -68,7 +69,7 @@ ingredients:
         type: regular
         value: 1.0
     unit: tsp
-    scalable: true
+    scalable: false
   note: null
   reference: null
   relation:
@@ -87,7 +88,7 @@ ingredients:
         type: regular
         value: 200.0
     unit: g
-    scalable: true
+    scalable: false
   note: null
   reference: null
   relation:
diff --git a/tests/snapshots/snapshot_test__scaled_recipe_output.snap b/tests/snapshots/snapshot_test__scaled_recipe_output.snap
index 14eaa9f..9bcb3cd 100644
--- a/tests/snapshots/snapshot_test__scaled_recipe_output.snap
+++ b/tests/snapshots/snapshot_test__scaled_recipe_output.snap
@@ -1,5 +1,6 @@
 ---
 source: tests/snapshot_test.rs
+assertion_line: 289
 expression: formatted
 ---
 {
@@ -24,8 +25,8 @@ expression: formatted
       "name": "water",
       "note": null,
       "quantity": {
-        "scalable": true,
-        "unit": "cups",
+        "scalable": false,
+        "unit": "c",
         "value": {
           "type": "number",
           "value": {
@@ -50,13 +51,18 @@ expression: formatted
       "name": "salt",
       "note": null,
       "quantity": {
-        "scalable": true,
-        "unit": "tsp",
+        "scalable": false,
+        "unit": "tbsp",
         "value": {
           "type": "number",
           "value": {
-            "type": "regular",
-            "value": 3.0
+            "type": "fraction",
+            "value": {
+              "den": 1,
+              "err": -6.762804893867269e-8,
+              "num": 0,
+              "whole": 1
+            }
           }
         }
       },
@@ -76,7 +82,7 @@ expression: formatted
       "name": "pasta",
       "note": null,
       "quantity": {
-        "scalable": true,
+        "scalable": false,
         "unit": "g",
         "value": {
           "type": "number",