diff --git a/editor/.DS_Store b/editor/.DS_Store
new file mode 100644
index 0000000..05bb5d7
Binary files /dev/null and b/editor/.DS_Store differ
diff --git a/editor/vscode-jdg/README.md b/editor/vscode-jdg/README.md
new file mode 100644
index 0000000..9b76cd2
--- /dev/null
+++ b/editor/vscode-jdg/README.md
@@ -0,0 +1,29 @@
+# Judge DSL — VS Code extension
+
+Syntax highlighting for `.jdg` files (the judge test-suite DSL).
+
+## Install (local, no marketplace)
+
+### VS Code
+
+Copy this directory into your extensions folder — VS Code loads it on next
+restart:
+
+```sh
+# VS Code
+cp -r editor/vscode-jdg ~/.vscode/extensions/jdg-language-0.1.0
+```
+
+Restart the editor, open any `.jdg` file — you should see keywords, strings,
+durations highlighted.
+
+### Package as `.vsix` (shareable)
+
+```sh
+npm install -g @vscode/vsce
+cd editor/vscode-jdg
+vsce package
+# → jdg-language-0.1.0.vsix
+```
+
+Then in VS Code: `Extensions` → `...` → `Install from VSIX`.
diff --git a/editor/vscode-jdg/jdg-language-0.1.0.vsix b/editor/vscode-jdg/jdg-language-0.1.0.vsix
new file mode 100644
index 0000000..8fe0516
Binary files /dev/null and b/editor/vscode-jdg/jdg-language-0.1.0.vsix differ
diff --git a/editor/vscode-jdg/language-configuration.json b/editor/vscode-jdg/language-configuration.json
new file mode 100644
index 0000000..0cd0878
--- /dev/null
+++ b/editor/vscode-jdg/language-configuration.json
@@ -0,0 +1,24 @@
+{
+  "comments": {
+    "lineComment": "//"
+  },
+  "brackets": [
+    ["{", "}"],
+    ["(", ")"]
+  ],
+  "autoClosingPairs": [
+    { "open": "{", "close": "}" },
+    { "open": "(", "close": ")" },
+    { "open": "\"", "close": "\"", "notIn": ["string"] },
+    { "open": "\"\"\"", "close": "\"\"\"" }
+  ],
+  "surroundingPairs": [
+    ["{", "}"],
+    ["(", ")"],
+    ["\"", "\""]
+  ],
+  "indentationRules": {
+    "increaseIndentPattern": "^.*\\{[^}]*$",
+    "decreaseIndentPattern": "^\\s*\\}"
+  }
+}
diff --git a/editor/vscode-jdg/package.json b/editor/vscode-jdg/package.json
new file mode 100644
index 0000000..56e7b92
--- /dev/null
+++ b/editor/vscode-jdg/package.json
@@ -0,0 +1,22 @@
+{
+  "name": "jdg-language",
+  "displayName": "Judge DSL (.jdg)",
+  "description": "Syntax highlighting for judge test-suite files",
+  "version": "0.1.0",
+  "publisher": "judge",
+  "engines": { "vscode": "^1.60.0" },
+  "categories": ["Programming Languages"],
+  "contributes": {
+    "languages": [{
+      "id": "jdg",
+      "aliases": ["Judge DSL", "jdg"],
+      "extensions": [".jdg"],
+      "configuration": "./language-configuration.json"
+    }],
+    "grammars": [{
+      "language": "jdg",
+      "scopeName": "source.jdg",
+      "path": "./syntaxes/jdg.tmLanguage.json"
+    }]
+  }
+}
diff --git a/editor/vscode-jdg/syntaxes/jdg.tmLanguage.json b/editor/vscode-jdg/syntaxes/jdg.tmLanguage.json
new file mode 100644
index 0000000..021df6c
--- /dev/null
+++ b/editor/vscode-jdg/syntaxes/jdg.tmLanguage.json
@@ -0,0 +1,83 @@
+{
+  "$schema": "https://raw.githubusercontent.com/martinring/tmlanguage/master/tmlanguage.json",
+  "name": "Judge DSL",
+  "scopeName": "source.jdg",
+  "fileTypes": ["jdg"],
+  "patterns": [
+    { "include": "#comments" },
+    { "include": "#heredoc" },
+    { "include": "#string" },
+    { "include": "#duration" },
+    { "include": "#number" },
+    { "include": "#boolean" },
+    { "include": "#top-keywords" },
+    { "include": "#block-keywords" },
+    { "include": "#matcher-keywords" },
+    { "include": "#scoring-values" },
+    { "include": "#operators" },
+    { "include": "#braces" },
+    { "include": "#identifier" }
+  ],
+  "repository": {
+    "comments": {
+      "name": "comment.line.double-slash.jdg",
+      "match": "//.*$"
+    },
+    "heredoc": {
+      "name": "string.quoted.triple.jdg",
+      "begin": "\"\"\"",
+      "end": "\"\"\"",
+      "patterns": [
+        { "name": "constant.character.escape.jdg", "match": "\\\\[nt\\\\\"]" }
+      ]
+    },
+    "string": {
+      "name": "string.quoted.double.jdg",
+      "begin": "\"",
+      "end": "\"",
+      "patterns": [
+        { "name": "constant.character.escape.jdg", "match": "\\\\[nt\\\\\"]" }
+      ]
+    },
+    "duration": {
+      "name": "constant.numeric.duration.jdg",
+      "match": "\\b-?\\d+(?:\\.\\d+)?(?:ms|s|m|h)\\b"
+    },
+    "number": {
+      "name": "constant.numeric.jdg",
+      "match": "\\b-?\\d+(?:\\.\\d+)?\\b"
+    },
+    "boolean": {
+      "name": "constant.language.boolean.jdg",
+      "match": "\\b(?:true|false)\\b"
+    },
+    "top-keywords": {
+      "name": "keyword.control.jdg",
+      "match": "\\b(?:build|build_linux|build_windows|build_darwin|binary|timeout|normalize_crlf|trim_trailing_ws|group|test|pattern|env|file|outFile)\\b"
+    },
+    "block-keywords": {
+      "name": "variable.parameter.jdg",
+      "match": "\\b(?:weight|scoring|wrapper|stdin|stdout|stderr|args|exitCode|input|output|dirs)\\b"
+    },
+    "matcher-keywords": {
+      "name": "support.function.jdg",
+      "match": "\\b(?:contains|matches|anyOrder|of)\\b"
+    },
+    "scoring-values": {
+      "name": "constant.language.jdg",
+      "match": "\\b(?:partial|all_or_none)\\b"
+    },
+    "operators": {
+      "name": "keyword.operator.jdg",
+      "match": "[=~]"
+    },
+    "braces": {
+      "name": "punctuation.section.braces.jdg",
+      "match": "[{}()]"
+    },
+    "identifier": {
+      "name": "variable.other.jdg",
+      "match": "\\b[A-Za-z_][A-Za-z0-9_]*\\b"
+    }
+  }
+}
diff --git a/example/c-sum/sum.jdg b/example/c-sum/sum.jdg
index 375d639..95494e9 100644
--- a/example/c-sum/sum.jdg
+++ b/example/c-sum/sum.jdg
@@ -8,7 +8,6 @@
 // Under MSVC on CI we use build_windows (cl's CLI is different).
 
 build         "$CC -O2 -std=c11 -Wall -Wextra solution.c -o solution"
-build_windows "cl /nologo /O2 /W3 solution.c /Fe:solution.exe"
 
 binary = "solution"
 timeout 5s