langgraph.js migration

CLAUDE.md

@@ -1,7 +1,7 @@
 # AI Context - Working Agreement
 
 <project-description>
-AI-assisted game development environment using the VibeGame engine. Iterative development with Svelte UI, Monaco editor, and Smolagents for AI-driven game modifications with console feedback loops.
+AI-assisted game development environment using the VibeGame engine. Iterative development with Svelte UI, Monaco editor, and LangGraph.js agent for AI-driven game modifications.
 </project-description>
 
 **Required**: Read [layers/structure.md](layers/structure.md) before proceeding with any task

bun.lock

@@ -6,6 +6,8 @@
       "dependencies": {
         "@huggingface/hub": "^2.6.3",
         "@huggingface/inference": "^4.8.0",
+        "@langchain/core": "^0.3.75",
+        "@langchain/langgraph": "^0.4.9",
         "@types/marked": "^6.0.0",
         "@types/node": "^24.3.3",
         "gsap": "^3.13.0",
@@ -13,6 +15,7 @@
         "monaco-editor": "^0.50.0",
         "svelte-splitpanes": "^8.0.5",
         "vibegame": "^0.1.1",
+        "zod": "^4.1.8",
       },
       "devDependencies": {
         "@eslint/js": "^9.33.0",
@@ -37,6 +40,8 @@
   "packages": {
     "@ampproject/remapping": ["@ampproject/remapping@2.3.0", "", { "dependencies": { "@jridgewell/gen-mapping": "^0.3.5", "@jridgewell/trace-mapping": "^0.3.24" } }, "sha512-30iZtAPgz+LTIYoeivqYo853f02jBYSd5uGnGpkFV0M3xOt9aN73erkgYAmZU43x4VfqcnLxW9Kpg3R5LC4YYw=="],
 
+    "@cfworker/json-schema": ["@cfworker/json-schema@4.1.1", "", {}, "sha512-gAmrUZSGtKc3AiBL71iNWxDsyUC5uMaKKGdvzYsBoTW/xi42JQHl7eKV2OYzCUqvc+D2RCcf7EXY2iCyFIk6og=="],
+
     "@dimforge/rapier3d-compat": ["@dimforge/rapier3d-compat@0.18.2", "", {}, "sha512-DTXrOsn3ra9ZonB+VyqJc16xnRXWsHVa5FK230Z+R1PJ7q8oSRmWQ+AU6e+IJYBHxkM0a5QVDqd729DyeEhHPA=="],
 
     "@esbuild/aix-ppc64": ["@esbuild/aix-ppc64@0.21.5", "", { "os": "aix", "cpu": "ppc64" }, "sha512-1SDgH6ZSPTlggy1yI6+Dbkiz8xzpHJEVAlF/AM1tHPLsf5STom9rwtjE4hKAF20FfXXNTFqEYXyJNWh1GiZedQ=="],
@@ -127,6 +132,14 @@
 
     "@jridgewell/trace-mapping": ["@jridgewell/trace-mapping@0.3.31", "", { "dependencies": { "@jridgewell/resolve-uri": "^3.1.0", "@jridgewell/sourcemap-codec": "^1.4.14" } }, "sha512-zzNR+SdQSDJzc8joaeP8QQoCQr8NuYx2dIIytl1QeBEZHJ9uW6hebsrYgbz8hJwUQao3TWCMtmfV8Nu1twOLAw=="],
 
+    "@langchain/core": ["@langchain/core@0.3.75", "", { "dependencies": { "@cfworker/json-schema": "^4.0.2", "ansi-styles": "^5.0.0", "camelcase": "6", "decamelize": "1.2.0", "js-tiktoken": "^1.0.12", "langsmith": "^0.3.67", "mustache": "^4.2.0", "p-queue": "^6.6.2", "p-retry": "4", "uuid": "^10.0.0", "zod": "^3.25.32", "zod-to-json-schema": "^3.22.3" } }, "sha512-kTyBS0DTeD0JYa9YH5lg6UdDbHmvplk3t9PCjP5jDQZCK5kPe2aDFToqdiCaLzZg8RzzM+clXLVyJtPTE8bZ2Q=="],
+
+    "@langchain/langgraph": ["@langchain/langgraph@0.4.9", "", { "dependencies": { "@langchain/langgraph-checkpoint": "^0.1.1", "@langchain/langgraph-sdk": "~0.1.0", "uuid": "^10.0.0", "zod": "^3.25.32" }, "peerDependencies": { "@langchain/core": ">=0.3.58 < 0.4.0", "zod-to-json-schema": "^3.x" }, "optionalPeers": ["zod-to-json-schema"] }, "sha512-+rcdTGi4Ium4X/VtIX3Zw4RhxEkYWpwUyz806V6rffjHOAMamg6/WZDxpJbrP33RV/wJG1GH12Z29oX3Pqq3Aw=="],
+
+    "@langchain/langgraph-checkpoint": ["@langchain/langgraph-checkpoint@0.1.1", "", { "dependencies": { "uuid": "^10.0.0" }, "peerDependencies": { "@langchain/core": ">=0.2.31 <0.4.0 || ^1.0.0-alpha" } }, "sha512-h2bP0RUikQZu0Um1ZUPErQLXyhzroJqKRbRcxYRTAh49oNlsfeq4A3K4YEDRbGGuyPZI/Jiqwhks1wZwY73AZw=="],
+
+    "@langchain/langgraph-sdk": ["@langchain/langgraph-sdk@0.1.3", "", { "dependencies": { "@types/json-schema": "^7.0.15", "p-queue": "^6.6.2", "p-retry": "4", "uuid": "^9.0.0" }, "peerDependencies": { "@langchain/core": ">=0.2.31 <0.4.0", "react": "^18 || ^19", "react-dom": "^18 || ^19" }, "optionalPeers": ["@langchain/core", "react", "react-dom"] }, "sha512-muZJ+D9A7gL0/QSvsjL6LMwgvN58euO2+MwSXq5Nb40ZgnjVWWtUYmjdVLno4IpgAXWXOQi34i2XtLbTwbyXvg=="],
+
     "@nodelib/fs.scandir": ["@nodelib/fs.scandir@2.1.5", "", { "dependencies": { "@nodelib/fs.stat": "2.0.5", "run-parallel": "^1.1.9" } }, "sha512-vq24Bq3ym5HEQm2NKCr3yXDwjc7vTsEThRDnkp2DK9p1uqLR+DHurm/NOTo0KG7HYHU7eppKZj3MyqYuMBf62g=="],
 
     "@nodelib/fs.stat": ["@nodelib/fs.stat@2.0.5", "", {}, "sha512-RkhPPp2zrqDAQA/2jNhnztcPAlv64XdhIp7a7454A5ovI7Bukxgt7MX7udwAu3zg1DcpPU0rz3VV1SeaqvY4+A=="],
@@ -199,6 +212,10 @@
 
     "@types/react": ["@types/react@19.1.13", "", { "dependencies": { "csstype": "^3.0.2" } }, "sha512-hHkbU/eoO3EG5/MZkuFSKmYqPbSVk5byPFa3e7y/8TybHiLMACgI8seVYlicwk7H5K/rI2px9xrQp/C+AUDTiQ=="],
 
+    "@types/retry": ["@types/retry@0.12.0", "", {}, "sha512-wWKOClTTiizcZhXnPY4wikVAwmdYHp8q6DmC+EJUzAMsycb7HB32Kh9RN4+0gExjmPmZSAQjgURXIGATPegAvA=="],
+
+    "@types/uuid": ["@types/uuid@10.0.0", "", {}, "sha512-7gqG38EyHgyP1S+7+xomFtL+ZNHcKv6DwNaCZmJmo1vgMugyF3TCnXVg4t1uk89mLNwnLtnY3TpOpCOyp1/xHQ=="],
+
     "@types/ws": ["@types/ws@8.18.1", "", { "dependencies": { "@types/node": "*" } }, "sha512-ThVF6DCVhA8kUGy+aazFQ4kXQ7E1Ty7A3ypFOe0IcJV8O/M511G99AW24irKrW56Wt44yG9+ij8FaqoBGkuBXg=="],
 
     "@typescript-eslint/eslint-plugin": ["@typescript-eslint/eslint-plugin@8.43.0", "", { "dependencies": { "@eslint-community/regexpp": "^4.10.0", "@typescript-eslint/scope-manager": "8.43.0", "@typescript-eslint/type-utils": "8.43.0", "@typescript-eslint/utils": "8.43.0", "@typescript-eslint/visitor-keys": "8.43.0", "graphemer": "^1.4.0", "ignore": "^7.0.0", "natural-compare": "^1.4.0", "ts-api-utils": "^2.1.0" }, "peerDependencies": { "@typescript-eslint/parser": "^8.43.0", "eslint": "^8.57.0 || ^9.0.0", "typescript": ">=4.8.4 <6.0.0" } }, "sha512-8tg+gt7ENL7KewsKMKDHXR1vm8tt9eMxjJBYINf6swonlWgkYn5NwyIgXpbbDxTNU5DgpDFfj95prcTq2clIQQ=="],
@@ -229,7 +246,7 @@
 
     "ansi-regex": ["ansi-regex@5.0.1", "", {}, "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ=="],
 
-    "ansi-styles": ["ansi-styles@4.3.0", "", { "dependencies": { "color-convert": "^2.0.1" } }, "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg=="],
+    "ansi-styles": ["ansi-styles@5.2.0", "", {}, "sha512-Cxwpt2SfTzTtXcfOlzGEee8O+c+MmUgGrNiBcXnuWxuFJHe6a5Hz7qwhwe5OgaSYI0IJvkLqWX1ASG+cJOkEiA=="],
 
     "anymatch": ["anymatch@3.1.3", "", { "dependencies": { "normalize-path": "^3.0.0", "picomatch": "^2.0.4" } }, "sha512-KMReFUr0B4t+D+OBkjR3KYqvocp2XaSzO55UcB6mgQMd3KbcE+mWTyvVV7D/zsdEbNnV6acZUutkiHQXvTr1Rw=="],
 
@@ -257,6 +274,8 @@
 
     "balanced-match": ["balanced-match@1.0.2", "", {}, "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw=="],
 
+    "base64-js": ["base64-js@1.5.1", "", {}, "sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA=="],
+
     "binary-extensions": ["binary-extensions@2.3.0", "", {}, "sha512-Ceh+7ox5qe7LJuLHoY0feh3pHuUDHAcRUeyL2VYghZwfpkNIy/+8Ocg0a3UuSoYzavmylwuLWQOf3hl0jjMMIw=="],
 
     "bitecs": ["bitecs@0.3.40", "", {}, "sha512-wAylY4pNfX8IeIH5phtwt1lUNtHKrkoSNrArI7Ris2Y4nEQWFIVvXdgAuqprEg9bq8Wolmlj0gVfeG6MFmtI2Q=="],
@@ -277,6 +296,8 @@
 
     "callsites": ["callsites@3.1.0", "", {}, "sha512-P8BjAsXvZS+VIDUI11hHCQEv74YT67YUi5JJFNWIqL235sBmjX4+qx9Muvls5ivyNENctx46xQLQ3aTuE7ssaQ=="],
 
+    "camelcase": ["camelcase@6.3.0", "", {}, "sha512-Gmy6FhYlCY7uOElZUSbxo2UCDH8owEk996gkbrpsgGtrJLM3J7jGxl9Ic7Qwwj4ivOE5AWZWRMecDdF7hqGjFA=="],
+
     "chalk": ["chalk@4.1.2", "", { "dependencies": { "ansi-styles": "^4.1.0", "supports-color": "^7.1.0" } }, "sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA=="],
 
     "chokidar": ["chokidar@3.6.0", "", { "dependencies": { "anymatch": "~3.1.2", "braces": "~3.0.2", "glob-parent": "~5.1.2", "is-binary-path": "~2.1.0", "is-glob": "~4.0.1", "normalize-path": "~3.0.0", "readdirp": "~3.6.0" }, "optionalDependencies": { "fsevents": "~2.3.2" } }, "sha512-7VT13fmjotKpGipCW9JEQAusEPE+Ei8nl6/g4FBAmIm0GOOLMua9NDDo/DWp0ZAxCr3cPq5ZpBqmPAQgDda2Pw=="],
@@ -291,6 +312,8 @@
 
     "concat-map": ["concat-map@0.0.1", "", {}, "sha512-/Srv4dswyQNBfohGpz9o6Yb3Gz3SrUDqBH5rTuhGR7ahtlbYKnVxw2bCFMRljaA7EXHaXZ8wsHdodFvbkhKmqg=="],
 
+    "console-table-printer": ["console-table-printer@2.14.6", "", { "dependencies": { "simple-wcswidth": "^1.0.1" } }, "sha512-MCBl5HNVaFuuHW6FGbL/4fB7N/ormCy+tQ+sxTrF6QtSbSNETvPuOVbkJBhzDgYhvjWGrTma4eYJa37ZuoQsPw=="],
+
     "cross-spawn": ["cross-spawn@7.0.6", "", { "dependencies": { "path-key": "^3.1.0", "shebang-command": "^2.0.0", "which": "^2.0.1" } }, "sha512-uV2QOWP2nWzsy2aMp8aRibhi9dlzF5Hgh5SHaB9OiTGEyDTiJJyx0uy51QXdyWbtAHNua4XJzUKca3OzKUd3vA=="],
 
     "css-tree": ["css-tree@2.3.1", "", { "dependencies": { "mdn-data": "2.0.30", "source-map-js": "^1.0.1" } }, "sha512-6Fv1DV/TYw//QF5IzQdqsNDjx/wc8TrMBZsqjL9eW01tWb7R7k/mq+/VXfJCl7SoD5emsJop9cOByJZfs8hYIw=="],
@@ -305,6 +328,8 @@
 
     "debug": ["debug@4.4.1", "", { "dependencies": { "ms": "^2.1.3" } }, "sha512-KcKCqiftBJcZr++7ykoDIEwSa3XWowTfNPo92BYxjXiyYEVrUQh2aLyhxBCwww+heortUFxEJYcRzosstTEBYQ=="],
 
+    "decamelize": ["decamelize@1.2.0", "", {}, "sha512-z2S+W9X73hAUUki+N+9Za2lBlun89zigOyGrsax+KUQ6wKW4ZoWpEYBkGhQjwAjjDCkWxhY0VKEhk8wzY7F5cA=="],
+
     "deep-is": ["deep-is@0.1.4", "", {}, "sha512-oIPzksmTg4/MriiaYGO+okXDT7ztn/w3Eptv/+gSIdMdKsJo0u4CfYNFJPy+4SKMuCqGw2wxnA+URMg3t8a/bQ=="],
 
     "deepmerge": ["deepmerge@4.3.1", "", {}, "sha512-3sUqbMEc77XqpdNO7FRyRog+eW3ph+GYCbj+rK+uYyRMuwsVy0rMiVtPn+QJlKFvWP/1PYpapqYn0Me2knFn+A=="],
@@ -373,6 +398,8 @@
 
     "esutils": ["esutils@2.0.3", "", {}, "sha512-kVscqXk4OCp68SZ0dkgEKVi6/8ij300KBWTJq32P/dYeWTSwK41WyTxalN1eRmA5Z9UU/LX9D7FWSmV9SAYx6g=="],
 
+    "eventemitter3": ["eventemitter3@4.0.7", "", {}, "sha512-8guHBZCwKnFhYdHr2ysuRWErTwhoN2X8XELRlrRwpmfeY2jjuUN4taQMsULKUVo1K4DvZl+0pgfyoysHxvmvEw=="],
+
     "fast-deep-equal": ["fast-deep-equal@3.1.3", "", {}, "sha512-f3qQ9oQy9j2AhBe/H9VC91wLmKBCCU/gDOnKNAYG5hswO7BLKj09Hc5HYNz9cGI++xlpDCIgDaitVs03ATR84Q=="],
 
     "fast-diff": ["fast-diff@1.3.0", "", {}, "sha512-VxPP4NqbUjj6MaAOafWeUn2cXWLcCtljklUtZf0Ind4XQ+QPtmA0b18zZy0jIQx+ExRVCR/ZQpBmik5lXshNsw=="],
@@ -515,6 +542,8 @@
 
     "isexe": ["isexe@2.0.0", "", {}, "sha512-RHxMLp9lnKHGHRng9QFhRCMbYAcVpn69smSGcq3f36xjgVVWThj4qqLbTLlq7Ssj8B+fIQ1EuCEGI2lKsyQeIw=="],
 
+    "js-tiktoken": ["js-tiktoken@1.0.21", "", { "dependencies": { "base64-js": "^1.5.1" } }, "sha512-biOj/6M5qdgx5TKjDnFT1ymSpM5tbd3ylwDtrQvFQSu0Z7bBYko2dF+W/aUkXUPuk6IVpRxk/3Q2sHOzGlS36g=="],
+
     "js-yaml": ["js-yaml@4.1.0", "", { "dependencies": { "argparse": "^2.0.1" }, "bin": { "js-yaml": "bin/js-yaml.js" } }, "sha512-wpxZs9NoxZaJESJGIZTyDEaYpl0FKSA+FB9aJiyemKhMwkxQg63h4T1KJgUGHpTqPDNRcmmYLugrRjJlBtWvRA=="],
 
     "json-buffer": ["json-buffer@3.0.1", "", {}, "sha512-4bV5BfR2mqfQTJm+V5tPPdf+ZpuhiIvTuAB5g8kcrXOZpTT/QwwVRWBywX1ozr6lEuPdbHxwaJlm9G6mI2sfSQ=="],
@@ -529,6 +558,8 @@
 
     "kleur": ["kleur@4.1.5", "", {}, "sha512-o+NO+8WrRiQEE4/7nwRJhN1HWpVmJm511pBHUxPLtp0BUISzlBplORYSmTclCnJvQq2tKu/sgl3xVpkc7ZWuQQ=="],
 
+    "langsmith": ["langsmith@0.3.68", "", { "dependencies": { "@types/uuid": "^10.0.0", "chalk": "^4.1.2", "console-table-printer": "^2.12.1", "p-queue": "^6.6.2", "p-retry": "4", "semver": "^7.6.3", "uuid": "^10.0.0" }, "peerDependencies": { "@opentelemetry/api": "*", "@opentelemetry/exporter-trace-otlp-proto": "*", "@opentelemetry/sdk-trace-base": "*", "openai": "*" }, "optionalPeers": ["@opentelemetry/api", "@opentelemetry/exporter-trace-otlp-proto", "@opentelemetry/sdk-trace-base", "openai"] }, "sha512-Yx4fnyTjrPKtqH2ax9nb6Ua6XAMYkafKkOLMcTzbJ/w+Yu3V6JjE+vabl/Q600oC53bo3hg6ourI4/KdZVXr4A=="],
+
     "levn": ["levn@0.4.1", "", { "dependencies": { "prelude-ls": "^1.2.1", "type-check": "~0.4.0" } }, "sha512-+bT2uH4E5LGE7h/n3evcS/sQlJXCpIp6ym8OWJ5eV6+67Dsql/LaaT7qJBAt2rzfoa/5QBGBhxDix1dMt2kQKQ=="],
 
     "locate-character": ["locate-character@3.0.0", "", {}, "sha512-SW13ws7BjaeJ6p7Q6CO2nchbYEc3X3J6WrmTTDto7yMPqVSZTUyY5Tjbid+Ab8gLnATtygYtiDIJGQRRn2ZOiA=="],
@@ -563,6 +594,8 @@
 
     "ms": ["ms@2.1.3", "", {}, "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA=="],
 
+    "mustache": ["mustache@4.2.0", "", { "bin": { "mustache": "bin/mustache" } }, "sha512-71ippSywq5Yb7/tVYyGbkBggbU8H3u5Rz56fH60jGFgr8uHwxs+aSKeqmluIVzM0m0kB7xQjKS6qPfd0b2ZoqQ=="],
+
     "nanoid": ["nanoid@3.3.11", "", { "bin": { "nanoid": "bin/nanoid.cjs" } }, "sha512-N8SpfPUnUp1bK+PMYW8qSWdl9U+wwNWI4QKxOYDy9JAro3WMX7p2OeVRF9v+347pnakNevPmiHhNmZ2HbFA76w=="],
 
     "natural-compare": ["natural-compare@1.4.0", "", {}, "sha512-OWND8ei3VtNC9h7V60qff3SVobHr996CTwgxubgyQYEpg290h9J0buyECNNJexkFm5sOajh5G116RYA1c8ZMSw=="],
@@ -587,10 +620,18 @@
 
     "own-keys": ["own-keys@1.0.1", "", { "dependencies": { "get-intrinsic": "^1.2.6", "object-keys": "^1.1.1", "safe-push-apply": "^1.0.0" } }, "sha512-qFOyK5PjiWZd+QQIh+1jhdb9LpxTF0qs7Pm8o5QHYZ0M3vKqSqzsZaEB6oWlxZ+q2sJBMI/Ktgd2N5ZwQoRHfg=="],
 
+    "p-finally": ["p-finally@1.0.0", "", {}, "sha512-LICb2p9CB7FS+0eR1oqWnHhp0FljGLZCWBE9aix0Uye9W8LTQPwMTYVGWQWIw9RdQiDg4+epXQODwIYJtSJaow=="],
+
     "p-limit": ["p-limit@3.1.0", "", { "dependencies": { "yocto-queue": "^0.1.0" } }, "sha512-TYOanM3wGwNGsZN2cVTYPArw454xnXj5qmWF1bEoAc4+cU/ol7GVh7odevjp1FNHduHc3KZMcFduxU5Xc6uJRQ=="],
 
     "p-locate": ["p-locate@5.0.0", "", { "dependencies": { "p-limit": "^3.0.2" } }, "sha512-LaNjtRWUBY++zB5nE/NwcaoMylSPk+S+ZHNB1TzdbMJMny6dynpAGt7X/tl/QYq3TIeE6nxHppbo2LGymrG5Pw=="],
 
+    "p-queue": ["p-queue@6.6.2", "", { "dependencies": { "eventemitter3": "^4.0.4", "p-timeout": "^3.2.0" } }, "sha512-RwFpb72c/BhQLEXIZ5K2e+AhgNVmIejGlTgiB9MzZ0e93GRvqZ7uSi0dvRF7/XIXDeNkra2fNHBxTyPDGySpjQ=="],
+
+    "p-retry": ["p-retry@4.6.2", "", { "dependencies": { "@types/retry": "0.12.0", "retry": "^0.13.1" } }, "sha512-312Id396EbJdvRONlngUx0NydfrIQ5lsYu0znKVUzVvArzEIt08V1qhtyESbGVd1FGX7UKtiFp5uwKZdM8wIuQ=="],
+
+    "p-timeout": ["p-timeout@3.2.0", "", { "dependencies": { "p-finally": "^1.0.0" } }, "sha512-rhIwUycgwwKcP9yTOOFK/AKsAopjjCakVqLHePO3CC6Mir1Z99xT+R63jZxAT5lFZLa2inS5h+ZS2GvR99/FBg=="],
+
     "parent-module": ["parent-module@1.0.1", "", { "dependencies": { "callsites": "^3.0.0" } }, "sha512-GQ2EWRpQV8/o+Aw8YqtfZZPfNRWZYkbidE9k5rpl/hC3vtHHBfGm2Ifi6qWV+coDGkrUKZAxE3Lot5kcsRlh+g=="],
 
     "path-exists": ["path-exists@4.0.0", "", {}, "sha512-ak9Qy5Q7jYb2Wwcey5Fpvg2KoAc/ZIhLSLOSBmRmygPsGwkVVt0fZa0qrtMz+m6tJTAHfZQ8FnmB4MG4LWy7/w=="],
@@ -631,6 +672,8 @@
 
     "resolve-from": ["resolve-from@4.0.0", "", {}, "sha512-pb/MYmXstAkysRFx8piNI1tGFNQIFA3vkE3Gq4EuA1dF6gHp/+vgZqsCGJapvy8N3Q+4o7FwvquPJcnZ7RYy4g=="],
 
+    "retry": ["retry@0.13.1", "", {}, "sha512-XQBQ3I8W1Cge0Seh+6gjj03LbmRFWuoszgK9ooCpwYIrhhoO80pfq4cUkU5DkknwfOfFteRwlZ56PYOGYyFWdg=="],
+
     "reusify": ["reusify@1.1.0", "", {}, "sha512-g6QUff04oZpHs0eG5p83rFLhHeV00ug/Yf9nZM6fLeUrPguBTkTQOdpAWWspMh55TZfVQDPaN3NQJfbVRAxdIw=="],
 
     "rimraf": ["rimraf@2.7.1", "", { "dependencies": { "glob": "^7.1.3" }, "bin": { "rimraf": "./bin.js" } }, "sha512-uWjbaKIK3T1OSVptzX7Nl6PvQ3qAGtKEtVRjRuazjfL3Bx5eI409VZSqgND+4UNnmzLVdPj9FqFJNPqBZFve4w=="],
@@ -669,6 +712,8 @@
 
     "side-channel-weakmap": ["side-channel-weakmap@1.0.2", "", { "dependencies": { "call-bound": "^1.0.2", "es-errors": "^1.3.0", "get-intrinsic": "^1.2.5", "object-inspect": "^1.13.3", "side-channel-map": "^1.0.1" } }, "sha512-WPS/HvHQTYnHisLo9McqBHOJk2FkHO/tlpvldyrnem4aeQp4hai3gythswg6p01oSoTl58rcpiFAjF2br2Ak2A=="],
 
+    "simple-wcswidth": ["simple-wcswidth@1.1.2", "", {}, "sha512-j7piyCjAeTDSjzTSQ7DokZtMNwNlEAyxqSZeCS+CXH7fJ4jx3FuJ/mTW3mE+6JLs4VJBbcll0Kjn+KXI5t21Iw=="],
+
     "sorcery": ["sorcery@0.11.1", "", { "dependencies": { "@jridgewell/sourcemap-codec": "^1.4.14", "buffer-crc32": "^1.0.0", "minimist": "^1.2.0", "sander": "^0.5.0" }, "bin": { "sorcery": "bin/sorcery" } }, "sha512-o7npfeJE6wi6J9l0/5LKshFzZ2rMatRiCDwYeDQaOzqdzRJwALhX7mk/A/ecg6wjMu7wdZbmXfD2S/vpOg0bdQ=="],
 
     "source-map-js": ["source-map-js@1.2.1", "", {}, "sha512-UXWMKhLOwVKb728IUtQPXxfYU+usdybtUrK/8uGE8CQMvrhOpwvzDBwj0QhSL7MQc7vIsISBG8VQ8+IDQxpfQA=="],
@@ -733,6 +778,8 @@
 
     "uri-js": ["uri-js@4.4.1", "", { "dependencies": { "punycode": "^2.1.0" } }, "sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg=="],
 
+    "uuid": ["uuid@10.0.0", "", { "bin": { "uuid": "dist/bin/uuid" } }, "sha512-8XkAphELsDnEGrDxUOHB3RGvXz6TeuYSGEZBOjtTtPm2lwhGBjLgOzLHB63IUWfBpNucQjND6d3AOudO+H3RWQ=="],
+
     "vibegame": ["vibegame@0.1.1", "", { "dependencies": { "@dimforge/rapier3d-compat": "^0.18.2", "gsap": "^3.13.0", "zod": "^4.1.5" }, "peerDependencies": { "bitecs": ">=0.3.40", "three": ">=0.170.0" } }, "sha512-HjWMlO4qUus9ChEBsD+abS9UGle/qiDZWukIqkve811N2oliKjWE7WYCDhqaDhWS18FaaYaY1a/Vc8yF0HaS1Q=="],
 
     "vite": ["vite@5.4.20", "", { "dependencies": { "esbuild": "^0.21.3", "postcss": "^8.4.43", "rollup": "^4.20.0" }, "optionalDependencies": { "fsevents": "~2.3.3" }, "peerDependencies": { "@types/node": "^18.0.0 || >=20.0.0", "less": "*", "lightningcss": "^1.21.0", "sass": "*", "sass-embedded": "*", "stylus": "*", "sugarss": "*", "terser": "^5.4.0" }, "optionalPeers": ["@types/node", "less", "lightningcss", "sass", "sass-embedded", "stylus", "sugarss", "terser"], "bin": { "vite": "bin/vite.js" } }, "sha512-j3lYzGC3P+B5Yfy/pfKNgVEg4+UtcIJcVRt2cDjIOmhLourAqPqf8P7acgxeiSgUB7E3p2P8/3gNIgDLpwzs4g=="],
@@ -759,14 +806,24 @@
 
     "zod": ["zod@4.1.8", "", {}, "sha512-5R1P+WwQqmmMIEACyzSvo4JXHY5WiAFHRMg+zBZKgKS+Q1viRa0C1hmUKtHltoIFKtIdki3pRxkmpP74jnNYHQ=="],
 
+    "zod-to-json-schema": ["zod-to-json-schema@3.24.6", "", { "peerDependencies": { "zod": "^3.24.1" } }, "sha512-h/z3PKvcTcTetyjl1fkj79MHNEjm+HpD6NXheWjzOekY7kV+lwDYnHw+ivHkijnCSMz1yJaWBD9vu/Fcmk+vEg=="],
+
     "@eslint-community/eslint-utils/eslint-visitor-keys": ["eslint-visitor-keys@3.4.3", "", {}, "sha512-wpc+LXeiyiisxPlEkUzU6svyS1frIO3Mgxj1fdy7Pm8Ygzguax2N3Fa/D/ag1WqbOprdI+uY6wMUl8/a2G+iag=="],
 
     "@eslint/eslintrc/ignore": ["ignore@5.3.2", "", {}, "sha512-hsBTNUqQTDwkWtcdYI2i06Y/nUBEsNEDJKjWdigLvegy8kDuJAS8uRlpkkcQpyEXL0Z/pjDy5HBmMjRCJ2gq+g=="],
 
+    "@langchain/core/zod": ["zod@3.25.76", "", {}, "sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ=="],
+
+    "@langchain/langgraph/zod": ["zod@3.25.76", "", {}, "sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ=="],
+
+    "@langchain/langgraph-sdk/uuid": ["uuid@9.0.1", "", { "bin": { "uuid": "dist/bin/uuid" } }, "sha512-b+1eJOlsR9K8HJpow9Ok3fiWOWSIcIzXodvv0rQjVoOVNpWMpxf1wZNpt4y9h10odCNrqnYp1OBzRktckBe3sA=="],
+
     "@typescript-eslint/typescript-estree/minimatch": ["minimatch@9.0.5", "", { "dependencies": { "brace-expansion": "^2.0.1" } }, "sha512-G6T0ZX48xgozx7587koeX9Ys2NYy6Gmv//P89sEte9V9whIapMNF4idKxnW2QtCcLiTWlb/wfCabAtAFWhhBow=="],
 
     "@typescript-eslint/typescript-estree/semver": ["semver@7.7.2", "", { "bin": { "semver": "bin/semver.js" } }, "sha512-RF0Fw+rO5AMf9MAyaRXI4AV0Ulj5lMHqVxxdSgiVbixSCXoEmmX/jk0CuJw4+3SqroYO9VoUh+HcuJivvtJemA=="],
 
+    "chalk/ansi-styles": ["ansi-styles@4.3.0", "", { "dependencies": { "color-convert": "^2.0.1" } }, "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg=="],
+
     "chokidar/glob-parent": ["glob-parent@5.1.2", "", { "dependencies": { "is-glob": "^4.0.1" } }, "sha512-AOIgSQCepiJYwP3ARnGx+5VnTu2HBYdzbGP45eLw1vr3zB3vZLeyed1sC9hnbcOc9/SrMyM5RPQrkGz4aS9Zow=="],
 
     "eslint/ignore": ["ignore@5.3.2", "", {}, "sha512-hsBTNUqQTDwkWtcdYI2i06Y/nUBEsNEDJKjWdigLvegy8kDuJAS8uRlpkkcQpyEXL0Z/pjDy5HBmMjRCJ2gq+g=="],
@@ -779,6 +836,8 @@
 
     "fast-glob/glob-parent": ["glob-parent@5.1.2", "", { "dependencies": { "is-glob": "^4.0.1" } }, "sha512-AOIgSQCepiJYwP3ARnGx+5VnTu2HBYdzbGP45eLw1vr3zB3vZLeyed1sC9hnbcOc9/SrMyM5RPQrkGz4aS9Zow=="],
 
+    "langsmith/semver": ["semver@7.7.2", "", { "bin": { "semver": "bin/semver.js" } }, "sha512-RF0Fw+rO5AMf9MAyaRXI4AV0Ulj5lMHqVxxdSgiVbixSCXoEmmX/jk0CuJw4+3SqroYO9VoUh+HcuJivvtJemA=="],
+
     "@typescript-eslint/typescript-estree/minimatch/brace-expansion": ["brace-expansion@2.0.2", "", { "dependencies": { "balanced-match": "^1.0.0" } }, "sha512-Jt0vHyM+jmUBqojB7E1NIYadt0vI0Qxjxd2TErW94wDz+E2LAm5vKMXXwg6ZZBTHPuUlDgQHKXvjGBdfcF1ZDQ=="],
   }
 }

layers/structure.md

@@ -9,7 +9,7 @@ AI-assisted iterative game development environment with real-time feedback
 - UI Framework: Svelte
 - Game Engine: VibeGame (3D physics, ECS)
 - Code Editor: Monaco Editor
-- AI Agent: Hugging Face Inference API
+- AI Agent: LangGraph.js with Hugging Face Inference
 - WebSocket: ws (for real-time communication)
 - Build: Vite
 - Animation: GSAP (bundled with VibeGame)
@@ -64,9 +64,8 @@ vibegame/
 Three-layer architecture: UI (Svelte) → Agent (Hugging Face) → Game (VibeGame)
 
 - **UI Layer**: Svelte components for chat, code editing, console display
-- **Agent Layer**: Hugging Face models via WebSocket for game assistance
+- **Agent Layer**: LangGraph.js agent via WebSocket with Read/Write tools
 - **Game Layer**: VibeGame ECS with declarative XML scene definition
-- **Feedback Loop**: Console output → Agent parsing → Self-correction (planned)
 
 ## Entry points
 
@@ -99,7 +98,6 @@ TypeScript/Web standards with Svelte and ECS conventions
 - State management → `src/lib/stores/[store].ts`
 - Business logic → `src/lib/services/[service].ts`
 - Server/Agent logic → `src/lib/server/[module].ts`
-- MCP tools → `src/lib/tools/[tool].ts`
 - Configuration → `src/lib/config/[config].ts`
 - Game entities → XML in Monaco editor
 - Custom ECS components → `src/lib/game/components/[Component].ts`

package.json

@@ -38,12 +38,15 @@
   "dependencies": {
     "@huggingface/hub": "^2.6.3",
     "@huggingface/inference": "^4.8.0",
+    "@langchain/core": "^0.3.75",
+    "@langchain/langgraph": "^0.4.9",
     "@types/marked": "^6.0.0",
     "@types/node": "^24.3.3",
     "gsap": "^3.13.0",
     "marked": "^16.2.1",
     "monaco-editor": "^0.50.0",
     "svelte-splitpanes": "^8.0.5",
-    "vibegame": "^0.1.1"
+    "vibegame": "^0.1.1",
+    "zod": "^4.1.8"
   }
 }

src/lib/components/chat/ReasoningBlock.svelte

@@ -14,14 +14,12 @@
         if (!iconElement || !contentElement) return;
         
         if (isExpanded) {
-            // Expand - quick but smooth
             gsap.to(iconElement, {
                 rotation: 180,
                 duration: 0.15,
                 ease: "power2.out"
             });
             
-            // Show content
             gsap.set(contentElement, { 
                 display: 'block'
             });
@@ -32,14 +30,13 @@
                 y: -10
             }, {
                 opacity: 1,
-                maxHeight: 500, // Large enough for content
+                maxHeight: 500,
                 y: 0,
                 duration: 0.2,
                 ease: "power2.out"
             });
             
         } else {
-            // Collapse - nearly instant
             gsap.to(iconElement, {
                 rotation: 0,
                 duration: 0.1,
@@ -234,4 +231,4 @@
     .reasoning-text::-webkit-scrollbar-thumb:hover {
         background: rgba(120, 120, 130, 0.5);
     }
-</style>
+</style>

src/lib/server/agent-config.ts

@@ -1,19 +0,0 @@
-export interface AgentConfig {
-  model?: string;
-  maxIterations?: number;
-  temperature?: number;
-  maxTokens?: number;
-}
-
-export const DEFAULT_CONFIG: Required<AgentConfig> = {
-  model: "Qwen/Qwen3-Next-80B-A3B-Instruct",
-  maxIterations: 10,
-  temperature: 0.5,
-  maxTokens: 1200,
-};
-
-export const mergeConfig = (
-  config: AgentConfig = {},
-): Required<AgentConfig> => {
-  return { ...DEFAULT_CONFIG, ...config };
-};

src/lib/server/agent-runner.test.ts

@@ -1,100 +0,0 @@
-import { describe, expect, test, beforeAll } from "bun:test";
-import { AgentRunner } from "./agent-runner";
-import "../tools"; // Import to register tools
-
-describe("AgentRunner Tool Execution", () => {
-  beforeAll(() => {
-    // Create runner instance for test context
-    new AgentRunner({
-      model: "test-model",
-      temperature: 0.7,
-      maxTokens: 1000,
-    });
-  });
-
-  describe("Tool Detection", () => {
-    test("should detect tool calls in response", async () => {
-      const { parseToolCalls } = await import("../tools");
-
-      // Test various agent responses
-      const responses = [
-        {
-          text: "I'll read the game code for you.\n\n[TOOL: read_game_code]\n\nAnalyzing...",
-          expected: ["read_game_code"],
-        },
-        {
-          text: "Let me check that. [TOOL: read_game_code] Now I can see the code.",
-          expected: ["read_game_code"],
-        },
-        {
-          text: "No tools needed for this response.",
-          expected: [],
-        },
-      ];
-
-      for (const { text, expected } of responses) {
-        const calls = parseToolCalls(text);
-        expect(calls.map((c) => c.tool)).toEqual(expected);
-      }
-    });
-
-    test("should format tool results correctly", async () => {
-      const { formatToolResult } = await import("../tools");
-
-      const successResult = {
-        success: true,
-        data: { content: "<world>test</world>", language: "html" },
-      };
-
-      const formatted = formatToolResult("read_game_code", successResult);
-      expect(formatted).toContain("[TOOL_RESULT: read_game_code]");
-      expect(formatted).toContain("<world>test</world>");
-      expect(formatted).toContain("[/TOOL_RESULT]");
-    });
-  });
-
-  describe("System Prompt", () => {
-    test("should include tool instructions", async () => {
-      const { toolRegistry } = await import("../tools");
-      const descriptions = toolRegistry.getToolDescriptions();
-
-      // System prompt should mention the tool
-      expect(descriptions).toContain("read_game_code");
-      expect(descriptions).toContain(
-        "Get the current game code from the editor",
-      );
-    });
-  });
-});
-
-// Integration test that would require mocking HuggingFace API
-describe("Full Tool Flow (Mock)", () => {
-  test("should execute tool when detected in response", async () => {
-    // This test demonstrates the expected flow
-    // In production, this would make actual API calls
-
-    const mockResponse = "I'll check the game code.\n\n[TOOL: read_game_code]";
-    const { parseToolCalls, toolRegistry } = await import("../tools");
-
-    // 1. Parse tool calls from response
-    const calls = parseToolCalls(mockResponse);
-    expect(calls).toHaveLength(1);
-    expect(calls[0].tool).toBe("read_game_code");
-
-    // 2. Execute the tool
-    const result = await toolRegistry.execute(
-      calls[0].tool,
-      calls[0].parameters,
-    );
-    expect(result.success).toBe(true);
-    expect(result.data).toBeDefined();
-
-    // 3. Format result for context
-    const { formatToolResult } = await import("../tools");
-    const formatted = formatToolResult(calls[0].tool, result);
-    expect(formatted).toContain("[TOOL_RESULT:");
-
-    // 4. In the real flow, this formatted result would be added to message history
-    // and a follow-up API call would be made to process it
-  });
-});

src/lib/server/agent-runner.ts

@@ -1,176 +0,0 @@
-import { HfInference } from "@huggingface/inference";
-import { toolRegistry, toolExecutor } from "../tools";
-import { documentationService } from "./documentation";
-import {
-  buildSystemPrompt,
-  buildToolFollowUpPrompt,
-  formatDocumentation,
-} from "./prompts";
-import { mergeConfig, type AgentConfig } from "./agent-config";
-import { UniversalReasoningExtractor } from "./reasoning-extractor";
-
-export interface AgentMessage {
-  id: string;
-  role: "user" | "assistant" | "system";
-  content: string;
-  timestamp: number;
-  reasoning?: string;
-}
-
-export class AgentRunner {
-  private client: HfInference | null = null;
-  private config: Required<AgentConfig>;
-  private messageHistory: AgentMessage[] = [];
-  private reasoningExtractor = new UniversalReasoningExtractor();
-
-  constructor(config: AgentConfig = {}) {
-    this.config = mergeConfig(config);
-  }
-
-  async initialize(hfToken?: string) {
-    if (!hfToken) {
-      throw new Error(
-        "Hugging Face authentication required. Please sign in to continue.",
-      );
-    }
-    this.client = new HfInference(hfToken);
-  }
-
-  async processMessage(
-    message: string,
-    onStream?: (chunk: string, reasoning?: string) => void,
-  ): Promise<string> {
-    if (!this.client) {
-      throw new Error("AgentRunner not initialized. Call initialize() first.");
-    }
-
-    this.addUserMessage(message);
-
-    const documentation = await this.loadDocumentation();
-    const systemPrompt = this.buildPrompt(documentation);
-
-    this.reasoningExtractor.reset();
-    const response = await this.streamCompletion(systemPrompt, onStream);
-
-    const extracted = this.reasoningExtractor.extract(response);
-    this.addAssistantMessage(extracted.content, extracted.reasoning);
-
-    const toolResults = await this.executeToolsIfNeeded(extracted.content);
-
-    if (toolResults.length > 0) {
-      this.addToolResults(toolResults);
-      return await this.handleToolFollowUp(documentation, onStream);
-    }
-
-    return extracted.content;
-  }
-
-  clearHistory() {
-    this.messageHistory = [];
-  }
-
-  getHistory(): AgentMessage[] {
-    return [...this.messageHistory];
-  }
-
-  private async loadDocumentation(): Promise<string> {
-    const fullDocs = await documentationService.load();
-    return formatDocumentation(fullDocs || "");
-  }
-
-  private buildPrompt(documentation: string): string {
-    const tools = toolRegistry.getToolDescriptions();
-    return buildSystemPrompt(tools, documentation);
-  }
-
-  private async streamCompletion(
-    systemPrompt: string,
-    onStream?: (chunk: string, reasoning?: string) => void,
-  ): Promise<string> {
-    const messages = this.buildMessages(systemPrompt);
-
-    const stream = await this.client!.chatCompletionStream({
-      model: this.config.model,
-      messages: messages as Array<{ role: string; content: string }>,
-      temperature: this.config.temperature,
-      max_tokens: this.config.maxTokens,
-    });
-
-    let fullResponse = "";
-    for await (const chunk of stream) {
-      const delta = chunk.choices?.[0]?.delta?.content;
-      if (delta) {
-        fullResponse += delta;
-
-        const result = this.reasoningExtractor.stream(delta);
-        if (result.partial) {
-          onStream?.(result.partial, result.reasoning);
-        } else if (result.reasoning) {
-          onStream?.("", result.reasoning);
-        }
-      }
-    }
-
-    return fullResponse;
-  }
-
-  private buildMessages(systemPrompt: string) {
-    return [
-      { role: "system", content: systemPrompt },
-      ...this.messageHistory.map((msg) => ({
-        role: msg.role,
-        content: msg.content,
-      })),
-    ];
-  }
-
-  private async executeToolsIfNeeded(response: string) {
-    return toolExecutor.executeFromResponse(response);
-  }
-
-  private addToolResults(results: { formatted: string }[]) {
-    for (const result of results) {
-      this.messageHistory.push({
-        id: this.generateId(),
-        role: "system",
-        content: result.formatted,
-        timestamp: Date.now(),
-      });
-    }
-  }
-
-  private async handleToolFollowUp(
-    documentation: string,
-    onStream?: (chunk: string, reasoning?: string) => void,
-  ): Promise<string> {
-    const followUpPrompt = buildToolFollowUpPrompt(documentation);
-    this.reasoningExtractor.reset();
-    const response = await this.streamCompletion(followUpPrompt, onStream);
-    const extracted = this.reasoningExtractor.extract(response);
-    this.addAssistantMessage(extracted.content, extracted.reasoning);
-    return extracted.content;
-  }
-
-  private addUserMessage(content: string) {
-    this.messageHistory.push({
-      id: this.generateId(),
-      role: "user",
-      content,
-      timestamp: Date.now(),
-    });
-  }
-
-  private addAssistantMessage(content: string, reasoning?: string) {
-    this.messageHistory.push({
-      id: this.generateId(),
-      role: "assistant",
-      content,
-      timestamp: Date.now(),
-      reasoning,
-    });
-  }
-
-  private generateId(): string {
-    return `msg-${Date.now()}-${Math.random().toString(36).substring(2, 11)}`;
-  }
-}

src/lib/server/api.ts

@@ -1,26 +1,40 @@
 import type { IncomingMessage } from "http";
 import type { WebSocket } from "ws";
-import type { AgentRunner } from "./agent-runner";
+import { LangGraphAgent } from "./langgraph-agent";
+import { HumanMessage, AIMessage, BaseMessage } from "@langchain/core/messages";
+import { updateEditorContent } from "./tools";
 
 export interface WebSocketMessage {
-  type: "chat" | "error" | "status" | "stream" | "auth";
+  type:
+    | "chat"
+    | "error"
+    | "status"
+    | "stream"
+    | "auth"
+    | "editor_update"
+    | "editor_sync"
+    | "tool_execution";
   payload: {
     content?: string;
     role?: string;
     chunk?: string;
-    reasoning?: string;
     error?: string;
     processing?: boolean;
     connected?: boolean;
     message?: string;
     token?: string;
+    toolName?: string;
+    toolArgs?: Record<string, unknown>;
+    toolResult?: string;
   };
   timestamp: number;
 }
 
 class WebSocketManager {
-  private connections: Map<WebSocket, { token?: string; agent?: AgentRunner }> =
-    new Map();
+  private connections: Map<
+    WebSocket,
+    { token?: string; agent?: LangGraphAgent; messages?: BaseMessage[] }
+  > = new Map();
 
   handleConnection(ws: WebSocket, _request: IncomingMessage) {
     this.connections.set(ws, {});
@@ -60,10 +74,9 @@ class WebSocketManager {
           connectionData.token = message.payload.token;
 
           try {
-            // Create a new agent instance for this connection
-            const { AgentRunner } = await import("./agent-runner");
-            connectionData.agent = new AgentRunner();
-            await connectionData.agent.initialize(message.payload.token);
+            connectionData.agent = new LangGraphAgent();
+            await connectionData.agent.initialize(message.payload.token, ws);
+            connectionData.messages = [];
 
             this.sendMessage(ws, {
               type: "status",
@@ -82,6 +95,12 @@ class WebSocketManager {
         }
         break;
 
+      case "editor_sync":
+        if (message.payload.content) {
+          updateEditorContent(message.payload.content);
+        }
+        break;
+
       case "chat":
         try {
           if (!connectionData?.agent) {
@@ -101,17 +120,25 @@ class WebSocketManager {
             timestamp: Date.now(),
           });
 
+          if (!connectionData.messages) {
+            connectionData.messages = [];
+          }
+          connectionData.messages.push(new HumanMessage(userMessage));
+
           const response = await connectionData.agent.processMessage(
             userMessage,
-            (chunk: string, reasoning?: string) => {
+            connectionData.messages.slice(0, -1),
+            (chunk: string) => {
               this.sendMessage(ws, {
                 type: "stream",
-                payload: { chunk, reasoning },
+                payload: { chunk },
                 timestamp: Date.now(),
               });
             },
           );
 
+          connectionData.messages.push(new AIMessage(response));
+
           this.sendMessage(ws, {
             type: "chat",
             payload: {
@@ -162,8 +189,3 @@ class WebSocketManager {
 }
 
 export const wsManager = new WebSocketManager();
-
-export async function initializeAgent() {
-  // Initialize tools when server starts
-  await import("../tools");
-}

src/lib/server/context.md

@@ -1,25 +1,29 @@
 # Server Context
 
-WebSocket server and AI agent orchestration with reasoning extraction.
+WebSocket server with React Agent pattern for AI-assisted game development.
 
-## Components
+## Key Components
 
-- `api.ts` - WebSocket connection management
-- `agent-runner.ts` - Message flow orchestration with reasoning filtering
-- `agent-config.ts` - Configuration constants
-- `prompts.ts` - Prompt templates
-- `documentation.ts` - Docs loading service
-- `reasoning-extractor.ts` - Filters thinking tags from model output
+- **api.ts** - WebSocket routing with editor sync and tool feedback
+- **langgraph-agent.ts** - React Agent with conditional loops for tool execution
+- **tools.ts** - Editor read/write with WebSocket-based state sync
+- **documentation.ts** - VibeGame documentation loader
+- **prompts.ts** - Documentation formatting utilities
 
 ## Architecture
 
-Clean separation of concerns:
-
-- Agent runner orchestrates message flow and filters reasoning
-- Reasoning extractor handles streaming tag extraction
-- Tools execute via registry pattern
-- Prompts and config externalized
-
-## Integration
-
-Frontend via `src/lib/stores/agent.ts` store with reasoning support.
+React Agent pattern with conditional execution flow:
+- Agent node processes messages and executes tools
+- Conditional edges loop back after tool execution
+- Tool results feed back into agent for final response
+- Real-time tool execution feedback via WebSocket
+
+## Message Types
+
+- `auth` - HF token authentication
+- `chat` - User messages
+- `editor_sync` - Sync editor content with server
+- `editor_update` - Server updates client editor
+- `tool_execution` - Tool execution notifications
+- `stream` - Response streaming
+- `status` - Connection and processing status

src/lib/server/hint.test.ts

@@ -1,31 +0,0 @@
-import { describe, expect, test } from "bun:test";
-
-describe("Message Enhancement for Tool Usage", () => {
-  test("should detect requests to read game code", () => {
-    const testCases = [
-      { input: "read the game code", shouldTrigger: true },
-      { input: "show me the game", shouldTrigger: true },
-      { input: "what's in the game?", shouldTrigger: true },
-      { input: "check the code", shouldTrigger: true },
-      { input: "view the editor", shouldTrigger: true },
-      { input: "see the scene", shouldTrigger: true },
-      { input: "display the game code", shouldTrigger: true },
-      { input: "look at the code", shouldTrigger: true },
-      { input: "get the game", shouldTrigger: true },
-      { input: "game code please", shouldTrigger: true },
-      { input: "hello there", shouldTrigger: false },
-      { input: "add a box", shouldTrigger: false },
-      { input: "change the color", shouldTrigger: false },
-    ];
-
-    const pattern =
-      /\b(read|show|view|check|see|what's in|what is in|get|display|look at)\b.*\b(game|code|editor|scene)\b/i;
-    const reversePattern =
-      /\b(game|code|editor|scene)\b.*\b(read|show|view|check|see|please)\b/i;
-
-    for (const { input, shouldTrigger } of testCases) {
-      const matches = pattern.test(input) || reversePattern.test(input);
-      expect(matches).toBe(shouldTrigger);
-    }
-  });
-});

src/lib/server/langgraph-agent.ts

@@ -0,0 +1,333 @@
+import { InferenceClient } from "@huggingface/inference";
+import { StateGraph, Annotation, START, END } from "@langchain/langgraph";
+import {
+  HumanMessage,
+  AIMessage,
+  BaseMessage,
+  ToolMessage,
+} from "@langchain/core/messages";
+import {
+  readEditorTool,
+  writeEditorTool,
+  setWebSocketConnection,
+} from "./tools";
+import { documentationService } from "./documentation";
+import type { WebSocket } from "ws";
+
+const AgentState = Annotation.Root({
+  messages: Annotation<BaseMessage[]>({
+    reducer: (x, y) => x.concat(y),
+  }),
+  hasToolCalls: Annotation<boolean>({
+    reducer: (_, y) => y,
+    default: () => false,
+  }),
+});
+
+export class LangGraphAgent {
+  private client: InferenceClient | null = null;
+  private graph!: ReturnType<typeof StateGraph.prototype.compile>;
+  private model: string = "Qwen/Qwen2.5-Coder-32B-Instruct";
+  private documentation: string = "";
+  private ws: WebSocket | null = null;
+
+  constructor() {
+    this.setupGraph();
+  }
+
+  async initialize(hfToken: string, ws?: WebSocket) {
+    if (!hfToken) {
+      throw new Error("Hugging Face authentication required");
+    }
+    this.client = new InferenceClient(hfToken);
+
+    if (ws) {
+      this.ws = ws;
+      setWebSocketConnection({
+        send: (message: { type: string; payload: Record<string, unknown> }) => {
+          if (this.ws && this.ws.readyState === this.ws.OPEN) {
+            this.ws.send(JSON.stringify(message));
+          }
+        },
+      });
+    }
+
+    const docs = await documentationService.load();
+    this.documentation = docs || "";
+  }
+
+  private setupGraph() {
+    const graph = new StateGraph(AgentState);
+
+    graph.addNode("agent", async (state) => {
+      const systemPrompt = this.buildSystemPrompt();
+      const messages = this.formatMessages(state.messages, systemPrompt);
+
+      const response = await this.callModel(messages);
+      const toolCalls = this.parseToolCalls(response);
+
+      if (toolCalls.length > 0) {
+        const toolResults = await this.executeTools(toolCalls);
+        const toolMessage = new AIMessage({
+          content: response,
+          additional_kwargs: { has_tool_calls: true },
+        });
+
+        return {
+          messages: [toolMessage, ...toolResults],
+          hasToolCalls: true,
+        };
+      }
+
+      return {
+        messages: [new AIMessage(response)],
+        hasToolCalls: false,
+      };
+    });
+
+    // @ts-expect-error - LangGraph type mismatch with START constant
+    graph.addEdge(START, "agent");
+
+    // @ts-expect-error - LangGraph type mismatch with conditional edges
+    graph.addConditionalEdges("agent", (state) => this.shouldContinue(state), {
+      continue: "agent",
+      end: END,
+    });
+
+    this.graph = graph.compile();
+  }
+
+  private shouldContinue(state: typeof AgentState.State): string {
+    const lastMessage = state.messages[state.messages.length - 1];
+
+    if (lastMessage instanceof ToolMessage) {
+      return "continue";
+    }
+
+    if (
+      lastMessage instanceof AIMessage &&
+      lastMessage.additional_kwargs?.has_tool_calls
+    ) {
+      return "continue";
+    }
+
+    return "end";
+  }
+
+  private buildSystemPrompt(): string {
+    return `You are an expert VibeGame developer assistant. VibeGame is a declarative 3D game engine using XML-like syntax.
+
+VIBEGAME DOCUMENTATION:
+${this.documentation}
+
+AVAILABLE TOOLS:
+- read_editor: Read the current code in the editor
+- write_editor: Write new code to the editor
+
+TOOL USAGE FORMAT:
+To use a tool, format your response with the tool call in this exact format:
+[TOOL: tool_name]
+or with parameters:
+[TOOL: tool_name {"param": "value"}]
+
+Example:
+To read the editor: [TOOL: read_editor]
+To write code: [TOOL: write_editor {"content": "<world>...</world>"}]
+
+IMPORTANT WORKFLOW:
+1. When asked to modify code, FIRST use read_editor to see the current code
+2. After receiving tool results, CONTINUE with your analysis and next steps
+3. Use write_editor to make the requested changes
+4. After writing, provide a clear explanation of what was changed
+
+When you receive tool results, use them to inform your next action. Do not stop after using a tool - continue until the task is complete.
+
+Be concise, accurate, and focus on practical solutions.`;
+  }
+
+  private formatMessages(
+    messages: BaseMessage[],
+    systemPrompt: string,
+  ): Array<{ role: string; content: string }> {
+    const formatted = [
+      { role: "system", content: systemPrompt },
+      ...messages.map((msg) => {
+        let role = "assistant";
+        if (msg instanceof HumanMessage) {
+          role = "user";
+        } else if (msg instanceof ToolMessage) {
+          const content = `Tool result for ${msg.name}: ${msg.content}`;
+          return { role: "assistant", content };
+        }
+
+        const content =
+          typeof msg.content === "string"
+            ? msg.content
+            : JSON.stringify(msg.content);
+        return { role, content };
+      }),
+    ];
+    return formatted;
+  }
+
+  private async callModel(
+    messages: Array<{ role: string; content: string }>,
+  ): Promise<string> {
+    if (!this.client) {
+      throw new Error("Agent not initialized");
+    }
+
+    const response = await this.client.chatCompletion({
+      model: this.model,
+      messages,
+      temperature: 0.3,
+      max_tokens: 2048,
+    });
+
+    return response.choices[0].message.content || "";
+  }
+
+  private parseToolCalls(
+    response: string,
+  ): Array<{ name: string; args: Record<string, unknown> }> {
+    const toolCalls = [];
+    const toolRegex = /\[TOOL:\s*(\w+)(?:\s+({[^}]+}))?\]/g;
+    let match;
+
+    while ((match = toolRegex.exec(response)) !== null) {
+      const toolName = match[1];
+      const params = match[2] ? JSON.parse(match[2]) : {};
+
+      toolCalls.push({
+        name: toolName,
+        args: params,
+      });
+    }
+
+    return toolCalls;
+  }
+
+  private async executeTools(
+    toolCalls: Array<{ name: string; args: Record<string, unknown> }>,
+  ): Promise<BaseMessage[]> {
+    const results = [];
+
+    for (const call of toolCalls) {
+      try {
+        if (this.ws && this.ws.readyState === this.ws.OPEN) {
+          this.ws.send(
+            JSON.stringify({
+              type: "tool_execution",
+              payload: {
+                toolName: call.name,
+                toolArgs: call.args,
+                message: `Executing ${call.name}...`,
+              },
+              timestamp: Date.now(),
+            }),
+          );
+        }
+
+        let result;
+        if (call.name === "read_editor") {
+          result = await readEditorTool.func("");
+        } else if (call.name === "write_editor") {
+          result = await writeEditorTool.func(call.args as { content: string });
+        } else {
+          result = `Unknown tool: ${call.name}`;
+        }
+
+        if (this.ws && this.ws.readyState === this.ws.OPEN) {
+          this.ws.send(
+            JSON.stringify({
+              type: "tool_execution",
+              payload: {
+                toolName: call.name,
+                toolResult: result,
+                message: `${call.name} completed`,
+              },
+              timestamp: Date.now(),
+            }),
+          );
+        }
+
+        results.push(
+          new ToolMessage({
+            content: result,
+            tool_call_id: `${call.name}_${Date.now()}`,
+            name: call.name,
+          }),
+        );
+      } catch (error) {
+        results.push(
+          new ToolMessage({
+            content: `Error executing ${call.name}: ${error}`,
+            tool_call_id: `${call.name}_${Date.now()}`,
+            name: call.name,
+          }),
+        );
+      }
+    }
+
+    return results;
+  }
+
+  async processMessage(
+    message: string,
+    messageHistory: BaseMessage[] = [],
+    onStream?: (chunk: string) => void,
+  ): Promise<string> {
+    if (!this.client) {
+      throw new Error("Agent not initialized");
+    }
+
+    const messages = [...messageHistory, new HumanMessage(message)];
+
+    const stream = await this.graph.stream({
+      messages,
+      hasToolCalls: false,
+    });
+
+    let fullResponse = "";
+    let isStreaming = false;
+    let lastAIResponse = "";
+    let hasExecutedTools = false;
+
+    for await (const chunk of stream) {
+      if (chunk.agent?.messages) {
+        for (const msg of chunk.agent.messages) {
+          if (msg instanceof AIMessage) {
+            const content = msg.content as string;
+
+            if (msg.additional_kwargs?.has_tool_calls) {
+              hasExecutedTools = true;
+              lastAIResponse = content;
+            } else {
+              if (!isStreaming) {
+                isStreaming = true;
+                for (const char of content) {
+                  fullResponse += char;
+                  onStream?.(char);
+                  await new Promise((resolve) => setTimeout(resolve, 5));
+                }
+              } else {
+                fullResponse = content;
+              }
+              lastAIResponse = content;
+            }
+          } else if (msg instanceof ToolMessage) {
+            if (onStream && !hasExecutedTools) {
+              const toolNotification = `\n🔧 ${msg.name}\n`;
+              for (const char of toolNotification) {
+                onStream(char);
+                await new Promise((resolve) => setTimeout(resolve, 5));
+              }
+            }
+          }
+        }
+      }
+    }
+
+    return fullResponse || lastAIResponse;
+  }
+}

src/lib/server/prompts.ts

@@ -1,50 +1,4 @@
-export const SYSTEM_PROMPTS = {
-  main: (
-    tools: string,
-    documentation: string,
-  ) => `You are an expert VibeGame developer assistant. VibeGame is a declarative 3D game engine using XML-like syntax, similar to Roblox but with "vibe coding" - focusing on quick, creative game development.
-
-ENGINE CONTEXT:
-VibeGame is a custom engine not in your training data. It uses declarative XML syntax for scene definition with Entity-Component-System (ECS) architecture.
-
-${documentation}
-
-AVAILABLE TOOLS:
-${tools}
-
-TOOL USAGE:
-- Execute tools with: [TOOL: tool_name] or [TOOL: tool_name {"param": "value"}]
-- read_game_code: Get current editor content
-- write_game_code: Update the editor with new code
-- read_console_output: Check console for errors, logs, and game output
-
-WORKFLOW:
-1. Read the current code to understand the game
-2. Make changes using write_game_code
-3. Check console output for errors or success
-4. Iterate based on feedback
-
-Be helpful, accurate, and adapt to what the user needs. Focus on working code and practical solutions.`,
-
-  toolFollowUp: (
-    documentation: string,
-  ) => `Based on the tool execution result, provide relevant analysis of what you found.
-
-${documentation}`,
-};
-
 export const formatDocumentation = (fullDocs: string): string => {
   return `VIBEGAME REFERENCE:
 ${fullDocs}`;
 };
-
-export const buildSystemPrompt = (
-  tools: string,
-  documentation: string,
-): string => {
-  return SYSTEM_PROMPTS.main(tools, documentation);
-};
-
-export const buildToolFollowUpPrompt = (documentation: string): string => {
-  return SYSTEM_PROMPTS.toolFollowUp(documentation);
-};

src/lib/server/reasoning-extractor.test.ts

@@ -1,114 +0,0 @@
-import { describe, test, expect } from "bun:test";
-import { UniversalReasoningExtractor } from "./reasoning-extractor";
-
-describe("UniversalReasoningExtractor", () => {
-  test("extracts Qwen thinking tags", () => {
-    const extractor = new UniversalReasoningExtractor();
-    const input = `<thinking>
-Let me analyze this step by step:
-1. First, I need to understand the problem
-2. Then I'll formulate a solution
-3. Finally, I'll provide the answer
-</thinking>
-
-The answer to your question is 42.`;
-
-    const result = extractor.extract(input);
-    expect(result.content).toBe("The answer to your question is 42.");
-    expect(result.reasoning).toContain("Let me analyze this step by step");
-  });
-
-  test("extracts DeepSeek R1 think tags", () => {
-    const extractor = new UniversalReasoningExtractor();
-    const input = `<think>
-Hmm, this is an interesting problem.
-I should consider multiple approaches.
-</think>
-
-Here's the solution to your problem.`;
-
-    const result = extractor.extract(input);
-    expect(result.content).toBe("Here's the solution to your problem.");
-    expect(result.reasoning).toContain("interesting problem");
-  });
-
-  test("handles interleaved reasoning tags", () => {
-    const extractor = new UniversalReasoningExtractor();
-    const input = `<thinking>
-First reasoning block
-</thinking>
-Some content here.
-<reasoning>
-Second reasoning block
-</reasoning>
-Final answer.`;
-
-    const result = extractor.extract(input);
-    expect(result.content).toBe("Some content here.\n\nFinal answer.");
-    expect(result.reasoning).toContain("First reasoning block");
-    expect(result.reasoning).toContain("Second reasoning block");
-  });
-
-  test("streams content correctly", () => {
-    const extractor = new UniversalReasoningExtractor();
-
-    const chunks = [
-      "Hello, ",
-      "<think",
-      "ing>",
-      "This is my ",
-      "reasoning process",
-      "</thinking>",
-      " Here is the answer.",
-    ];
-
-    let finalContent = "";
-    let finalReasoning = "";
-
-    for (const chunk of chunks) {
-      const result = extractor.stream(chunk);
-      if (result.partial) {
-        finalContent += result.partial;
-      }
-      if (result.reasoning) {
-        finalReasoning = result.reasoning;
-      }
-    }
-
-    expect(finalContent).toBe("Hello,  Here is the answer.");
-    expect(finalReasoning).toBe("This is my reasoning process");
-  });
-
-  test("handles multiple reasoning blocks", () => {
-    const extractor = new UniversalReasoningExtractor();
-    const input = `<thinking>First thought</thinking>
-Some content here.
-<reasoning>Second thought</reasoning>
-More content.`;
-
-    const result = extractor.extract(input);
-    expect(result.content).toBe("Some content here.\n\nMore content.");
-    expect(result.reasoning).toContain("First thought");
-    expect(result.reasoning).toContain("Second thought");
-  });
-
-  test("returns original text when no reasoning tags", () => {
-    const extractor = new UniversalReasoningExtractor();
-    const input = "This is just regular text without any reasoning tags.";
-
-    const result = extractor.extract(input);
-    expect(result.content).toBe(input);
-    expect(result.reasoning).toBe("");
-  });
-
-  test("reset clears internal state", () => {
-    const extractor = new UniversalReasoningExtractor();
-
-    extractor.stream("<thinking>Test");
-    extractor.reset();
-
-    const result = extractor.stream("Normal text");
-    expect(result.partial).toBe("Normal text");
-    expect(result.reasoning).toBeUndefined();
-  });
-});

src/lib/server/reasoning-extractor.ts

@@ -1,131 +0,0 @@
-export interface ExtractedContent {
-  reasoning: string;
-  content: string;
-}
-
-export interface StreamResult {
-  partial: string;
-  reasoning?: string;
-  complete: boolean;
-}
-
-export interface ReasoningExtractor {
-  patterns: RegExp[];
-  extract(text: string): ExtractedContent;
-  stream(chunk: string): StreamResult;
-  reset(): void;
-}
-
-export class UniversalReasoningExtractor implements ReasoningExtractor {
-  patterns = [
-    /<thinking>(.*?)<\/thinking>/s,
-    /<think>(.*?)<\/think>/s,
-    /<reasoning>(.*?)<\/reasoning>/s,
-  ];
-
-  private buffer = "";
-  private inReasoning = false;
-  private reasoningBuffer = "";
-  private currentTag: string | null = null;
-
-  extract(text: string): ExtractedContent {
-    let reasoning = "";
-    let cleanContent = text;
-
-    for (const pattern of this.patterns) {
-      const matches = Array.from(
-        text.matchAll(new RegExp(pattern.source, "gs")),
-      );
-
-      for (const match of matches) {
-        if (match[1]) {
-          reasoning += match[1].trim() + "\n";
-          cleanContent = cleanContent.replace(match[0], "");
-        }
-      }
-    }
-
-    return {
-      reasoning: reasoning.trim(),
-      content: cleanContent.trim(),
-    };
-  }
-
-  stream(chunk: string): StreamResult {
-    this.buffer += chunk;
-
-    const result: StreamResult = {
-      partial: "",
-      complete: false,
-    };
-
-    // Check for opening tags
-    if (!this.inReasoning) {
-      const openingMatch = this.buffer.match(/<(thinking|think|reasoning)>/);
-      if (openingMatch) {
-        const beforeTag = this.buffer.substring(0, openingMatch.index);
-        result.partial = beforeTag;
-        this.buffer = this.buffer.substring(
-          openingMatch.index! + openingMatch[0].length,
-        );
-        this.inReasoning = true;
-        this.currentTag = openingMatch[1];
-        return result;
-      }
-    }
-
-    // Check for closing tags
-    if (this.inReasoning && this.currentTag) {
-      const closingTag = `</${this.currentTag}>`;
-      const closingIndex = this.buffer.indexOf(closingTag);
-
-      if (closingIndex !== -1) {
-        this.reasoningBuffer += this.buffer.substring(0, closingIndex);
-        result.reasoning = this.reasoningBuffer.trim();
-        this.reasoningBuffer = "";
-        this.buffer = this.buffer.substring(closingIndex + closingTag.length);
-        this.inReasoning = false;
-        this.currentTag = null;
-
-        // Process any remaining content
-        const nextResult = this.stream("");
-        result.partial = nextResult.partial;
-        if (nextResult.reasoning) {
-          result.reasoning =
-            (result.reasoning || "") + "\n" + nextResult.reasoning;
-        }
-        return result;
-      } else {
-        // Still in reasoning, buffer it
-        this.reasoningBuffer += this.buffer;
-        this.buffer = "";
-        return result;
-      }
-    }
-
-    // No reasoning tags, output as content
-    if (!this.inReasoning && this.buffer.length > 0) {
-      // Check if we might be in the middle of a tag
-      const lastAngle = this.buffer.lastIndexOf("<");
-      if (lastAngle !== -1 && !this.buffer.substring(lastAngle).includes(">")) {
-        // Might be incomplete tag, output everything before it
-        result.partial = this.buffer.substring(0, lastAngle);
-        this.buffer = this.buffer.substring(lastAngle);
-      } else {
-        // Safe to output everything
-        result.partial = this.buffer;
-        this.buffer = "";
-      }
-    }
-
-    result.complete = !this.inReasoning && this.buffer.length === 0;
-    return result;
-  }
-
-  reset(): void {
-    this.buffer = "";
-    this.inReasoning = false;
-    this.reasoningBuffer = "";
-    this.currentTag = null;
-  }
-}

src/lib/server/tools.ts

@@ -0,0 +1,62 @@
+import { DynamicStructuredTool, DynamicTool } from "@langchain/core/tools";
+import { z } from "zod";
+
+let currentEditorContent = `<canvas id="game-canvas"></canvas>
+
+<world canvas="#game-canvas" sky="#87ceeb">
+  <!-- Ground -->
+  <static-part pos="0 -0.5 0" shape="box" size="20 1 20" color="#90ee90"></static-part>
+
+  <!-- Ball -->
+  <dynamic-part pos="-2 4 -3" shape="sphere" size="1" color="#ff4500"></dynamic-part>
+</world>
+
+<script type="module">
+  import * as GAME from 'vibegame';
+
+  GAME.run();
+</script>`;
+
+interface WebSocketConnection {
+  send: (message: { type: string; payload: Record<string, unknown> }) => void;
+}
+
+let wsConnection: WebSocketConnection | null = null;
+
+export function setWebSocketConnection(ws: WebSocketConnection) {
+  wsConnection = ws;
+}
+
+export function updateEditorContent(content: string) {
+  currentEditorContent = content;
+}
+
+export const readEditorTool = new DynamicTool({
+  name: "read_editor",
+  description: "Read the current code in the editor",
+  func: async () => {
+    return `Current editor content (html):\n${currentEditorContent}`;
+  },
+});
+
+export const writeEditorTool = new DynamicStructuredTool({
+  name: "write_editor",
+  description: "Write new code to the editor",
+  schema: z.object({
+    content: z.string().describe("The code content to write to the editor"),
+  }),
+  func: async (input: { content: string }) => {
+    currentEditorContent = input.content;
+
+    if (wsConnection) {
+      wsConnection.send({
+        type: "editor_update",
+        payload: { content: input.content },
+      });
+    }
+
+    return "Code updated successfully in the editor";
+  },
+});
+
+export const tools = [readEditorTool, writeEditorTool];

src/lib/stores/agent.ts

@@ -1,5 +1,6 @@
-import { writable, derived } from "svelte/store";
+import { writable, derived, get } from "svelte/store";
 import { authStore } from "../services/auth";
+import { editorStore } from "./editor";
 
 export interface ChatMessage {
   id: string;
@@ -53,6 +54,21 @@ function createAgentStore() {
             timestamp: Date.now(),
           }),
         );
+
+        const editorState = get(editorStore);
+        if (editorState && editorState.content) {
+          setTimeout(() => {
+            if (ws && ws.readyState === WebSocket.OPEN) {
+              ws.send(
+                JSON.stringify({
+                  type: "editor_sync",
+                  payload: { content: editorState.content },
+                  timestamp: Date.now(),
+                }),
+              );
+            }
+          }, 500);
+        }
       } else {
         update((state) => ({
           ...state,
@@ -101,6 +117,10 @@ function createAgentStore() {
       role?: string;
       content?: string;
       error?: string;
+      toolName?: string;
+      toolArgs?: Record<string, unknown>;
+      toolResult?: string;
+      message?: string;
     };
   }) {
     switch (message.type) {
@@ -199,6 +219,32 @@ function createAgentStore() {
           processing: false,
         }));
         break;
+
+      case "editor_update":
+        if (message.payload.content) {
+          editorStore.setContent(message.payload.content);
+        }
+        break;
+
+      case "tool_execution":
+        update((state) => {
+          const toolMessage: ChatMessage = {
+            id: `tool_${Date.now()}`,
+            role: "system",
+            content: `🔧 ${message.payload.toolName}: ${message.payload.message || "Executing..."}`,
+            timestamp: Date.now(),
+          };
+
+          if (message.payload.toolResult) {
+            toolMessage.content = `🔧 ${message.payload.toolName} completed`;
+          }
+
+          return {
+            ...state,
+            messages: [...state.messages, toolMessage],
+          };
+        });
+        break;
     }
   }
 

src/lib/stores/loading.ts

@@ -24,7 +24,6 @@ function createLoadingStore() {
     startLoading: () => {
       set({ isLoading: true, progress: 0 });
 
-      // Simulate initial progress
       let currentProgress = 0;
       progressInterval = window.setInterval(() => {
         currentProgress += Math.random() * 15;
@@ -44,10 +43,8 @@ function createLoadingStore() {
         progressInterval = null;
       }
 
-      // Complete the progress animation
       update((state) => ({ ...state, progress: 100 }));
 
-      // Hide loading screen after progress completes
       setTimeout(() => {
         set({ isLoading: false, progress: 100 });
       }, 300);

src/lib/tools/context.md

@@ -1,37 +0,0 @@
-# Tools Context
-
-AI agent tools for game manipulation and feedback.
-
-## Structure
-
-- `registry.ts` - Tool registration
-- `parser.ts` - Tool call parsing
-- `executor.ts` - Execution flow
-- `read-game-code.ts` - Editor content reader
-- `write-game-code.ts` - Editor content writer
-- `read-console-output.ts` - Console message reader
-- `index.ts` - Auto-registration
-
-## Architecture
-
-Clean separation:
-
-- Registry handles registration only
-- Parser extracts tool calls from responses
-- Executor manages execution flow
-- Individual tools implement business logic
-
-## Pattern
-
-Agent includes: `[TOOL: tool_name {"param": "value"}]`
-Results formatted: `[TOOL_RESULT: name]` or `[TOOL_ERROR: name]`
-
-## Available Tools
-
-1. **read_game_code** - Returns editor content
-2. **write_game_code** - Updates editor with new code
-3. **read_console_output** - Reads console messages with filtering
-
-## Workflow
-
-Read code → Write changes → Check console → Iterate on feedback

src/lib/tools/executor.ts

@@ -1,36 +0,0 @@
-import { toolRegistry } from "./registry";
-import { parseToolCalls, formatToolResult, type ToolCall } from "./parser";
-
-export interface ToolExecutionResult {
-  toolName: string;
-  formatted: string;
-  raw: {
-    success: boolean;
-    data?: unknown;
-    error?: string;
-  };
-}
-
-export class ToolExecutor {
-  async executeFromResponse(response: string): Promise<ToolExecutionResult[]> {
-    const toolCalls = parseToolCalls(response);
-
-    if (toolCalls.length === 0) {
-      return [];
-    }
-
-    return Promise.all(toolCalls.map((call) => this.executeSingle(call)));
-  }
-
-  private async executeSingle(call: ToolCall): Promise<ToolExecutionResult> {
-    const result = await toolRegistry.execute(call.tool, call.parameters);
-
-    return {
-      toolName: call.tool,
-      formatted: formatToolResult(call.tool, result),
-      raw: result,
-    };
-  }
-}
-
-export const toolExecutor = new ToolExecutor();

src/lib/tools/index.ts

@@ -1,17 +0,0 @@
-export { toolRegistry } from "./registry";
-export type { Tool, ToolResult } from "./registry";
-
-export { parseToolCalls, formatToolResult } from "./parser";
-export type { ToolCall } from "./parser";
-
-export { toolExecutor } from "./executor";
-export type { ToolExecutionResult } from "./executor";
-
-import { toolRegistry } from "./registry";
-import { readGameCodeTool } from "./read-game-code";
-import { writeGameCodeTool } from "./write-game-code";
-import { readConsoleOutputTool } from "./read-console-output";
-
-toolRegistry.register(readGameCodeTool);
-toolRegistry.register(writeGameCodeTool);
-toolRegistry.register(readConsoleOutputTool);

src/lib/tools/parser.ts

@@ -1,41 +0,0 @@
-export interface ToolCall {
-  tool: string;
-  parameters?: unknown;
-}
-
-const TOOL_PATTERN = /\[TOOL:\s*(\w+)(?:\s+({[^}]*}))?\]/g;
-
-export const parseToolCalls = (response: string): ToolCall[] => {
-  const toolCalls: ToolCall[] = [];
-  let match;
-
-  while ((match = TOOL_PATTERN.exec(response)) !== null) {
-    const toolName = match[1];
-    const paramsStr = match[2];
-
-    toolCalls.push({
-      tool: toolName,
-      parameters: paramsStr ? tryParseJson(paramsStr) : undefined,
-    });
-  }
-
-  return toolCalls;
-};
-
-const tryParseJson = (str: string): unknown => {
-  try {
-    return JSON.parse(str);
-  } catch {
-    return undefined;
-  }
-};
-
-export const formatToolResult = (
-  toolName: string,
-  result: { success: boolean; data?: unknown; error?: string },
-): string => {
-  if (result.success) {
-    return `[TOOL_RESULT: ${toolName}]\n${JSON.stringify(result.data, null, 2)}\n[/TOOL_RESULT]`;
-  }
-  return `[TOOL_ERROR: ${toolName}]\n${result.error}\n[/TOOL_ERROR]`;
-};

src/lib/tools/read-console-output.ts

@@ -1,47 +0,0 @@
-import { get } from "svelte/store";
-import { consoleStore } from "../stores/console";
-import type { Tool } from "./registry";
-
-interface ReadConsoleParams {
-  limit?: number;
-  type?: "log" | "warn" | "error" | "info";
-}
-
-export const readConsoleOutputTool: Tool = {
-  name: "read_console_output",
-  description: "Read messages from the game console",
-  execute: async (params: unknown) => {
-    const { limit = 10, type } = (params || {}) as ReadConsoleParams;
-
-    try {
-      const state = get(consoleStore);
-      let messages = state.messages;
-
-      if (type) {
-        messages = messages.filter((msg) => msg.type === type);
-      }
-
-      if (limit > 0) {
-        messages = messages.slice(-limit);
-      }
-
-      return {
-        success: true,
-        data: {
-          messages: messages.map((msg) => ({
-            type: msg.type,
-            message: msg.message,
-            timestamp: msg.timestamp,
-          })),
-          total: messages.length,
-        },
-      };
-    } catch (error) {
-      return {
-        success: false,
-        error:
-          error instanceof Error ? error.message : "Failed to read console",
-      };
-    }
-  },
-};

src/lib/tools/read-game-code.ts

@@ -1,18 +0,0 @@
-import { get } from "svelte/store";
-import { editorStore } from "../stores/editor";
-import type { Tool } from "./registry";
-
-export const readGameCodeTool: Tool = {
-  name: "read_game_code",
-  description: "Get the current game code from the editor",
-  execute: async () => {
-    const state = get(editorStore);
-    return {
-      success: true,
-      data: {
-        content: state.content,
-        language: state.language,
-      },
-    };
-  },
-};

src/lib/tools/registry.ts

@@ -1,51 +0,0 @@
-export interface Tool {
-  name: string;
-  description: string;
-  execute: (params: unknown) => Promise<ToolResult>;
-}
-
-export interface ToolResult {
-  success: boolean;
-  data?: unknown;
-  error?: string;
-}
-
-class ToolRegistry {
-  private tools: Map<string, Tool> = new Map();
-
-  register(tool: Tool): void {
-    this.tools.set(tool.name, tool);
-  }
-
-  async execute(toolName: string, params?: unknown): Promise<ToolResult> {
-    const tool = this.tools.get(toolName);
-
-    if (!tool) {
-      return {
-        success: false,
-        error: `Tool '${toolName}' not found. Available: ${this.getToolNames().join(", ")}`,
-      };
-    }
-
-    try {
-      return await tool.execute(params);
-    } catch (error) {
-      return {
-        success: false,
-        error: error instanceof Error ? error.message : "Unknown error",
-      };
-    }
-  }
-
-  getToolNames(): string[] {
-    return Array.from(this.tools.keys());
-  }
-
-  getToolDescriptions(): string {
-    return Array.from(this.tools.values())
-      .map((tool) => `- ${tool.name}: ${tool.description}`)
-      .join("\n");
-  }
-}
-
-export const toolRegistry = new ToolRegistry();

src/lib/tools/tools-integration.test.ts

@@ -1,110 +0,0 @@
-import { describe, it, expect, beforeEach } from "bun:test";
-import { get } from "svelte/store";
-import { toolRegistry } from "./registry";
-import { editorStore } from "../stores/editor";
-import { consoleStore } from "../stores/console";
-import "./index"; // Import to register tools
-
-describe("Tool Integration", () => {
-  beforeEach(() => {
-    // Reset stores
-    editorStore.setContent("");
-    consoleStore.reset();
-  });
-
-  describe("write_game_code", () => {
-    it("should update editor content", async () => {
-      const testCode = `<world canvas="#game-canvas">
-  <static-part pos="0 0 0" shape="box" size="10 1 10" color="#90ee90"></static-part>
-</world>`;
-
-      const result = await toolRegistry.execute("write_game_code", {
-        content: testCode,
-      });
-
-      expect(result.success).toBe(true);
-      expect(get(editorStore).content).toBe(testCode);
-    });
-
-    it("should handle invalid input", async () => {
-      const result = await toolRegistry.execute("write_game_code", {
-        content: 123, // Invalid type
-      });
-
-      expect(result.success).toBe(false);
-      expect(result.error).toContain("Content must be a string");
-    });
-  });
-
-  describe("read_game_code", () => {
-    it("should read current editor content", async () => {
-      const testCode = "<world>Test</world>";
-      editorStore.setContent(testCode);
-
-      const result = await toolRegistry.execute("read_game_code");
-
-      expect(result.success).toBe(true);
-      expect(result.data).toEqual({
-        content: testCode,
-        language: "html",
-      });
-    });
-  });
-
-  describe("read_console_output", () => {
-    it("should read console messages", async () => {
-      consoleStore.addMessage("log", "Game started");
-      consoleStore.addMessage("error", "Entity not found");
-      consoleStore.addMessage("warn", "Low performance");
-
-      const result = await toolRegistry.execute("read_console_output", {
-        limit: 2,
-      });
-
-      expect(result.success).toBe(true);
-      const data = result.data as { messages: Array<{ message: string }> };
-      expect(data.messages).toHaveLength(2);
-      expect(data.messages[1].message).toBe("Low performance");
-    });
-
-    it("should filter by type", async () => {
-      consoleStore.addMessage("log", "Info 1");
-      consoleStore.addMessage("error", "Error 1");
-      consoleStore.addMessage("log", "Info 2");
-
-      const result = await toolRegistry.execute("read_console_output", {
-        type: "error",
-      });
-
-      expect(result.success).toBe(true);
-      const data = result.data as { messages: Array<{ message: string }> };
-      expect(data.messages).toHaveLength(1);
-      expect(data.messages[0].message).toBe("Error 1");
-    });
-  });
-
-  describe("Tool workflow", () => {
-    it("should support a complete edit cycle", async () => {
-      // 1. Write some code
-      const code = `<world canvas="#game-canvas">
-  <dynamic-part pos="0 5 0" shape="sphere" size="1" color="#ff0000"></dynamic-part>
-</world>`;
-
-      await toolRegistry.execute("write_game_code", { content: code });
-
-      // 2. Read it back
-      const readResult = await toolRegistry.execute("read_game_code");
-      expect((readResult.data as { content: string }).content).toBe(code);
-
-      // 3. Simulate console output
-      consoleStore.addMessage("log", "Entity created: dynamic-part");
-      consoleStore.addMessage("info", "Physics initialized");
-
-      // 4. Read console
-      const consoleResult = await toolRegistry.execute("read_console_output");
-      expect(consoleResult.success).toBe(true);
-      const messages = (consoleResult.data as { messages: unknown[] }).messages;
-      expect(messages.length).toBeGreaterThan(0);
-    });
-  });
-});

src/lib/tools/write-game-code.ts

@@ -1,38 +0,0 @@
-import { editorStore } from "../stores/editor";
-import type { Tool } from "./registry";
-
-interface WriteGameCodeParams {
-  content: string;
-}
-
-export const writeGameCodeTool: Tool = {
-  name: "write_game_code",
-  description: "Update the game code in the editor",
-  execute: async (params: unknown) => {
-    const { content } = params as WriteGameCodeParams;
-
-    if (typeof content !== "string") {
-      return {
-        success: false,
-        error: "Content must be a string",
-      };
-    }
-
-    try {
-      editorStore.setContent(content);
-
-      return {
-        success: true,
-        data: {
-          message: "Code updated successfully",
-          length: content.length,
-        },
-      };
-    } catch (error) {
-      return {
-        success: false,
-        error: error instanceof Error ? error.message : "Failed to update code",
-      };
-    }
-  },
-};

vite.config.ts

@@ -2,7 +2,7 @@ import { defineConfig } from "vite";
 import { svelte } from "@sveltejs/vite-plugin-svelte";
 import { vibegame, consoleForwarding } from "vibegame/vite";
 import { WebSocketServer } from "ws";
-import { wsManager, initializeAgent } from "./src/lib/server/api";
+import { wsManager } from "./src/lib/server/api";
 
 export default defineConfig({
   plugins: [
@@ -14,8 +14,6 @@ export default defineConfig({
       configureServer(server) {
         const wss = new WebSocketServer({ noServer: true });
 
-        initializeAgent().catch(console.error);
-
         server.httpServer?.on("upgrade", (request, socket, head) => {
           if (request.url === "/ws") {
             wss.handleUpgrade(request, socket, head, (ws) => {
@@ -24,7 +22,6 @@ export default defineConfig({
           }
         });
 
-        // Serve OAuth callback page
         server.middlewares.use((req, res, next) => {
           if (req.url === "/auth/callback") {
             res.statusCode = 200;