🤖 Lazy-load AI SDK providers to reduce startup time

Makefile

@@ -29,6 +29,7 @@ include fmt.mk
 .PHONY: docs docs-build docs-watch
 .PHONY: benchmark-terminal
 .PHONY: ensure-deps
+.PHONY: check-eager-imports check-bundle-size check-startup
 
 TS_SOURCES := $(shell find src -type f \( -name '*.ts' -o -name '*.tsx' \))
 
@@ -126,7 +127,7 @@ build/icon.icns: docs/img/logo.webp
 	@rm -rf build/icon.iconset
 
 ## Quality checks (can run in parallel)
-static-check: lint typecheck fmt-check ## Run all static checks
+static-check: lint typecheck fmt-check check-eager-imports ## Run all static checks (includes startup performance checks)
 
 lint: node_modules/.installed ## Run ESLint (typecheck runs in separate target)
 	@./scripts/lint.sh
@@ -219,5 +220,14 @@ clean: ## Clean build artifacts
 	@rm -rf dist release build/icon.icns build/icon.png
 	@echo "Done!"
 
+## Startup Performance Checks
+check-eager-imports: ## Check for eager AI SDK imports in critical files
+	@./scripts/check_eager_imports.sh
+
+check-bundle-size: build ## Check that bundle sizes are within limits
+	@./scripts/check_bundle_size.sh
+
+check-startup: check-eager-imports check-bundle-size ## Run all startup performance checks
+
 # Parallel build optimization - these can run concurrently
 .NOTPARALLEL: build-main  # TypeScript can handle its own parallelism

bun.lock

@@ -5,10 +5,7 @@
       "name": "cmux",
       "dependencies": {
         "@ai-sdk/anthropic": "^2.0.20",
-        "@ai-sdk/google": "^2.0.17",
         "@ai-sdk/openai": "^2.0.40",
-        "@anthropic-ai/sdk": "^0.63.1",
-        "@dqbd/tiktoken": "^1.0.21",
         "@emotion/react": "^11.14.0",
         "@emotion/styled": "^11.14.1",
         "ai": "^5.0.56",
@@ -41,7 +38,6 @@
       "devDependencies": {
         "@eslint/js": "^9.36.0",
         "@playwright/test": "^1.56.0",
-        "@testing-library/react": "^16.3.0",
         "@types/bun": "^1.2.23",
         "@types/diff": "^8.0.0",
         "@types/jest": "^30.0.0",
@@ -84,8 +80,6 @@
 
     "@ai-sdk/gateway": ["@ai-sdk/gateway@1.0.35", "", { "dependencies": { "@ai-sdk/provider": "2.0.0", "@ai-sdk/provider-utils": "3.0.11", "@vercel/oidc": "3.0.2" }, "peerDependencies": { "zod": "^3.25.76 || ^4.1.8" } }, "sha512-cdsXbeRRMi6QxbZscin69Asx2fi0d2TmmPngcPFUMpZbchGEBiJYVNvIfiALKFKXEq0l/w0xGNV3E13vroaleA=="],
 
-    "@ai-sdk/google": ["@ai-sdk/google@2.0.18", "", { "dependencies": { "@ai-sdk/provider": "2.0.0", "@ai-sdk/provider-utils": "3.0.11" }, "peerDependencies": { "zod": "^3.25.76 || ^4.1.8" } }, "sha512-ycGAqouueHjU0hB6JHYmUhXYCnN67PqI8+9jCv13MbuE0g+b9w78HiPuab5ResakY0cq3ynFDvbiu8jAGo1RZQ=="],
-
     "@ai-sdk/openai": ["@ai-sdk/openai@2.0.45", "", { "dependencies": { "@ai-sdk/provider": "2.0.0", "@ai-sdk/provider-utils": "3.0.11" }, "peerDependencies": { "zod": "^3.25.76 || ^4.1.8" } }, "sha512-9OsVWzW502UCYN1VS9D+1flwrF9GqFvpfybfb1iLIdvmCbXXKXpozhLyuAW82FY67hfiIlOsvlgT9UYtljlQmw=="],
 
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@@ -96,8 +90,6 @@
 
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-    "@anthropic-ai/sdk": ["@anthropic-ai/sdk@0.63.1", "", { "dependencies": { "json-schema-to-ts": "^3.1.1" }, "peerDependencies": { "zod": "^3.25.0 || ^4.0.0" }, "optionalPeers": ["zod"], "bin": { "anthropic-ai-sdk": "bin/cli" } }, "sha512-wMA/Xx5GLO+npV992YKUfsmlI6699XG/jFjCPTf/nsMBfUh3e3KmNiOKuhqSMZibOjoLOlhYc7L4pfLPI8A+RA=="],
-
     "@babel/code-frame": ["@babel/code-frame@7.27.1", "", { "dependencies": { "@babel/helper-validator-identifier": "^7.27.1", "js-tokens": "^4.0.0", "picocolors": "^1.1.1" } }, "sha512-cjQ7ZlQ0Mv3b47hABuTevyTuYN4i+loJKGeV9flcCgIK37cCXRh+L1bd3iBHlynerhQ7BhCkn2BPbQUL+rGqFg=="],
 
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@@ -188,8 +180,6 @@
 
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-    "@dqbd/tiktoken": ["@dqbd/tiktoken@1.0.22", "", {}, "sha512-RYhO8xeHkMNX5Ixqf4M1Ve3siCYJY/dI0yLnlX4M4oIEDOvjMIQ+E+3OUpAaZcWTaMtQJzGcDAghYfllpx3i/w=="],
-
     "@electron/asar": ["@electron/asar@3.4.1", "", { "dependencies": { "commander": "^5.0.0", "glob": "^7.1.6", "minimatch": "^3.0.4" }, "bin": { "asar": "bin/asar.js" } }, "sha512-i4/rNPRS84t0vSRa2HorerGRXWyF4vThfHesw0dmcWHp+cspK743UanA0suA5Q5y8kzY2y6YKrvbIUn69BCAiA=="],
 
     "@electron/get": ["@electron/get@2.0.3", "", { "dependencies": { "debug": "^4.1.1", "env-paths": "^2.2.0", "fs-extra": "^8.1.0", "got": "^11.8.5", "progress": "^2.0.3", "semver": "^6.2.0", "sumchecker": "^3.0.1" }, "optionalDependencies": { "global-agent": "^3.0.0" } }, "sha512-Qkzpg2s9GnVV2I2BjRksUi43U5e6+zaQMcjoJy0C+C5oxaKl+fmckGDQFtRpZpZV0NQekuZZ+tGz7EA9TVnQtQ=="],
@@ -490,16 +480,10 @@
 
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-    "@testing-library/dom": ["@testing-library/dom@10.4.1", "", { "dependencies": { "@babel/code-frame": "^7.10.4", "@babel/runtime": "^7.12.5", "@types/aria-query": "^5.0.1", "aria-query": "5.3.0", "dom-accessibility-api": "^0.5.9", "lz-string": "^1.5.0", "picocolors": "1.1.1", "pretty-format": "^27.0.2" } }, "sha512-o4PXJQidqJl82ckFaXUeoAW+XysPLauYI43Abki5hABd853iMhitooc6znOnczgbTYmEP6U6/y1ZyKAIsvMKGg=="],
-
-    "@testing-library/react": ["@testing-library/react@16.3.0", "", { "dependencies": { "@babel/runtime": "^7.12.5" }, "peerDependencies": { "@testing-library/dom": "^10.0.0", "@types/react": "^18.0.0 || ^19.0.0", "@types/react-dom": "^18.0.0 || ^19.0.0", "react": "^18.0.0 || ^19.0.0", "react-dom": "^18.0.0 || ^19.0.0" }, "optionalPeers": ["@types/react", "@types/react-dom"] }, "sha512-kFSyxiEDwv1WLl2fgsq6pPBbw5aWKrsY2/noi1Id0TK0UParSF62oFQFGHXIyaG4pp2tEub/Zlel+fjjZILDsw=="],
-
     "@tootallnate/once": ["@tootallnate/once@2.0.0", "", {}, "sha512-XCuKFP5PS55gnMVu3dty8KPatLqUoy/ZYzDzAGCQ8JNFCkLXzmI7vNHCR+XpbZaMWQK/vQubr7PkYq8g470J/A=="],
 
     "@tybys/wasm-util": ["@tybys/wasm-util@0.10.1", "", { "dependencies": { "tslib": "^2.4.0" } }, "sha512-9tTaPJLSiejZKx+Bmog4uSubteqTvFrVrURwkmHixBo0G4seD0zUxp98E1DzUBJxLQ3NPwXrGKDiVjwx/DpPsg=="],
 
-    "@types/aria-query": ["@types/aria-query@5.0.4", "", {}, "sha512-rfT93uj5s0PRL7EzccGMs3brplhcrghnDoV26NqKhCAS1hVo+WdNsPvE/yb6ilfr5hi2MEk6d5EWJTKdxg8jVw=="],
-
     "@types/babel__core": ["@types/babel__core@7.20.5", "", { "dependencies": { "@babel/parser": "^7.20.7", "@babel/types": "^7.20.7", "@types/babel__generator": "*", "@types/babel__template": "*", "@types/babel__traverse": "*" } }, "sha512-qoQprZvz5wQFJwMDqeseRXWv3rqMvhgpbXFfVyWhbx9X47POIA6i/+dXefEmZKoAgOaTdaIgNSMqMIU61yRyzA=="],
 
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@@ -748,8 +732,6 @@
 
     "aria-hidden": ["aria-hidden@1.2.6", "", { "dependencies": { "tslib": "^2.0.0" } }, "sha512-ik3ZgC9dY/lYVVM++OISsaYDeg1tb0VtP5uL3ouh1koGOaUMDPpbFIei4JkFimWUFPn90sbMNMXQAIVOlnYKJA=="],
 
-    "aria-query": ["aria-query@5.3.0", "", { "dependencies": { "dequal": "^2.0.3" } }, "sha512-b0P0sZPKtyu8HkeRAfCq0IfURZK+SuwMjY1UXGBU27wpAiTwQAIlq56IbIO+ytk/JjS1fMR14ee5WBBfKi5J6A=="],
-
     "array-buffer-byte-length": ["array-buffer-byte-length@1.0.2", "", { "dependencies": { "call-bound": "^1.0.3", "is-array-buffer": "^3.0.5" } }, "sha512-LHE+8BuR7RYGDKvnrmcuSq3tDcKv9OFEXQt/HpbZhY7V6h0zlUXutnAD82GiFx9rdieCMjkvtcsPqBwgUl1Iiw=="],
 
     "array-includes": ["array-includes@3.1.9", "", { "dependencies": { "call-bind": "^1.0.8", "call-bound": "^1.0.4", "define-properties": "^1.2.1", "es-abstract": "^1.24.0", "es-object-atoms": "^1.1.1", "get-intrinsic": "^1.3.0", "is-string": "^1.1.1", "math-intrinsics": "^1.1.0" } }, "sha512-FmeCCAenzH0KH381SPT5FZmiA/TmpndpcaShhfgEN9eCVjnFBqq3l1xrI42y8+PPLI6hypzou4GXw00WHmPBLQ=="],
@@ -1060,8 +1042,6 @@
 
     "doctrine": ["doctrine@2.1.0", "", { "dependencies": { "esutils": "^2.0.2" } }, "sha512-35mSku4ZXK0vfCuHEDAwt55dg2jNajHZ1odvF+8SSr82EsZY4QmXfuWso8oEd8zRhVObSN18aM0CjSdoBX7zIw=="],
 
-    "dom-accessibility-api": ["dom-accessibility-api@0.5.16", "", {}, "sha512-X7BJ2yElsnOJ30pZF4uIIDfBEVgF4XEBxL9Bxhy6dnrm5hkzqmsWHGTiHqRiITNhMyFLyAiWndIJP7Z1NTteDg=="],
-
     "dompurify": ["dompurify@3.2.7", "", { "optionalDependencies": { "@types/trusted-types": "^2.0.7" } }, "sha512-WhL/YuveyGXJaerVlMYGWhvQswa7myDG17P7Vu65EWC05o8vfeNbvNf4d/BOvH99+ZW+LlQsc1GDKMa1vNK6dw=="],
 
     "dot-case": ["dot-case@3.0.4", "", { "dependencies": { "no-case": "^3.0.4", "tslib": "^2.0.3" } }, "sha512-Kv5nKlh6yRrdrGvxeJ2e5y2eRUpkUosIW4A2AS38zwSz27zu7ufDwQPi5Jhs3XAlGNetl3bmnGhQsMtkKJnj3w=="],
@@ -1514,8 +1494,6 @@
 
     "json-schema": ["json-schema@0.4.0", "", {}, "sha512-es94M3nTIfsEPisRafak+HDLfHXnKBhV3vU5eqPcS3flIWqcxJWgXHXiey3YrpaNsanY5ei1VoYEbOzijuq9BA=="],
 
-    "json-schema-to-ts": ["json-schema-to-ts@3.1.1", "", { "dependencies": { "@babel/runtime": "^7.18.3", "ts-algebra": "^2.0.0" } }, "sha512-+DWg8jCJG2TEnpy7kOm/7/AxaYoaRbjVB4LFZLySZlWn8exGs3A4OLJR966cVvU26N7X9TWxl+Jsw7dzAqKT6g=="],
-
     "json-schema-traverse": ["json-schema-traverse@0.4.1", "", {}, "sha512-xbbCH5dCYU5T8LcEhhuh7HJ88HXuW3qsI3Y0zOZFKfZEHcpWiHU/Jxzk629Brsab/mMiHQti9wMP+845RPe3Vg=="],
 
     "json-stable-stringify-without-jsonify": ["json-stable-stringify-without-jsonify@1.0.1", "", {}, "sha512-Bdboy+l7tA3OGW6FjyFHWkP5LuByj1Tk33Ljyq0axyzdk9//JSi2u3fP1QSmd1KNwq6VOKYGlAu87CisVir6Pw=="],
@@ -1592,8 +1570,6 @@
 
     "lru-cache": ["lru-cache@11.2.2", "", {}, "sha512-F9ODfyqML2coTIsQpSkRHnLSZMtkU8Q+mSfcaIyKwy58u+8k5nvAYeiNhsyMARvzNcXJ9QfWVrcPsC9e9rAxtg=="],
 
-    "lz-string": ["lz-string@1.5.0", "", { "bin": { "lz-string": "bin/bin.js" } }, "sha512-h5bgJWpxJNswbU7qCrV0tIKQCaS3blPDrqKWx+QxzuzL1zGUzij9XCWLrSLsJPu5t+eWA/ycetzYAO5IOMcWAQ=="],
-
     "make-dir": ["make-dir@4.0.0", "", { "dependencies": { "semver": "^7.5.3" } }, "sha512-hXdUTZYIVOt1Ex//jAQi+wTZZpUpwBj/0QsOzqegb3rGMMeJiSEu5xLHnYfBrRV4RH2+OCSOO95Is/7x1WJ4bw=="],
 
     "make-error": ["make-error@1.3.6", "", {}, "sha512-s8UhlNe7vPKomQhC1qFelMokr/Sc3AgNbso3n74mVPA5LTZwkB9NlXf4XPamLxJE8h0gh73rM94xvwRT2CVInw=="],
@@ -2112,8 +2088,6 @@
 
     "truncate-utf8-bytes": ["truncate-utf8-bytes@1.0.2", "", { "dependencies": { "utf8-byte-length": "^1.0.1" } }, "sha512-95Pu1QXQvruGEhv62XCMO3Mm90GscOCClvrIUwCM0PYOXK3kaF3l3sIHxx71ThJfcbM2O5Au6SO3AWCSEfW4mQ=="],
 
-    "ts-algebra": ["ts-algebra@2.0.0", "", {}, "sha512-FPAhNPFMrkwz76P7cdjdmiShwMynZYN6SgOujD1urY4oNm80Ou9oMdmbR45LotcKOXoy7wSmHkRFE6Mxbrhefw=="],
-
     "ts-api-utils": ["ts-api-utils@2.1.0", "", { "peerDependencies": { "typescript": ">=4.8.4" } }, "sha512-CUgTZL1irw8u29bzrOD/nH85jqyc74D6SshFgujOIA7osm2Rz7dYH77agkx7H4FBNxDq7Cjf+IjaX/8zwFW+ZQ=="],
 
     "ts-dedent": ["ts-dedent@2.2.0", "", {}, "sha512-q5W7tVM71e2xjHZTlgfTDoPF/SmqKG5hddq9SzR49CH2hayqRKJtQ4mtRlSxKaJlR/+9rEM+mnBHf7I2/BQcpQ=="],
@@ -2320,8 +2294,6 @@
 
     "@malept/flatpak-bundler/fs-extra": ["fs-extra@9.1.0", "", { "dependencies": { "at-least-node": "^1.0.0", "graceful-fs": "^4.2.0", "jsonfile": "^6.0.1", "universalify": "^2.0.0" } }, "sha512-hcg3ZmepS30/7BSFqRvoo3DOMQu7IjqxO5nCDt+zM9XWjb33Wg7ziNT+Qvqbuc3+gWpzO02JubVyk2G4Zvo1OQ=="],
 
-    "@testing-library/dom/pretty-format": ["pretty-format@27.5.1", "", { "dependencies": { "ansi-regex": "^5.0.1", "ansi-styles": "^5.0.0", "react-is": "^17.0.1" } }, "sha512-Qb1gy5OrP5+zDf2Bvnzdl3jsTf1qXVMazbvCoKhtKqVs4/YK4ozX4gKQJJVyNe+cajNPn0KoC0MC3FUmaHWEmQ=="],
-
     "@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@7.7.3", "", { "bin": { "semver": "bin/semver.js" } }, "sha512-SdsKMrI9TdgjdweUSR9MweHA4EJ8YxHn8DFaDisvhVlUOe4BF1tLD7GAj0lIqWVl+dPb/rExr0Btby5loQm20Q=="],
@@ -2506,8 +2478,6 @@
 
     "@istanbuljs/load-nyc-config/js-yaml/argparse": ["argparse@1.0.10", "", { "dependencies": { "sprintf-js": "~1.0.2" } }, "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg=="],
 
-    "@testing-library/dom/pretty-format/react-is": ["react-is@17.0.2", "", {}, "sha512-w2GsyukL62IJnlaff/nRegPQR94C/XXamvMWmSHRJ4y7Ts/4ocGRmTHvOs8PSE6pB3dWOrD/nueuU5sduBsQ4w=="],
-
     "@typescript-eslint/typescript-estree/minimatch/brace-expansion": ["brace-expansion@2.0.2", "", { "dependencies": { "balanced-match": "^1.0.0" } }, "sha512-Jt0vHyM+jmUBqojB7E1NIYadt0vI0Qxjxd2TErW94wDz+E2LAm5vKMXXwg6ZZBTHPuUlDgQHKXvjGBdfcF1ZDQ=="],
 
     "app-builder-lib/minimatch/brace-expansion": ["brace-expansion@2.0.2", "", { "dependencies": { "balanced-match": "^1.0.0" } }, "sha512-Jt0vHyM+jmUBqojB7E1NIYadt0vI0Qxjxd2TErW94wDz+E2LAm5vKMXXwg6ZZBTHPuUlDgQHKXvjGBdfcF1ZDQ=="],

eslint.config.mjs

@@ -204,6 +204,13 @@ export default defineConfig([
       ],
     },
   },
+  {
+    // Allow dynamic imports for lazy-loading AI SDK packages (startup optimization)
+    files: ["src/services/aiService.ts", "src/utils/tools/tools.ts", "src/utils/ai/providerFactory.ts"],
+    rules: {
+      "no-restricted-syntax": "off",
+    },
+  },
   {
     // Frontend architectural boundary - prevent services and tokenizer imports
     files: ["src/components/**", "src/contexts/**", "src/hooks/**", "src/App.tsx"],

package.json

@@ -31,13 +31,11 @@
   },
   "dependencies": {
     "@ai-sdk/anthropic": "^2.0.20",
-    "@ai-sdk/google": "^2.0.17",
     "@ai-sdk/openai": "^2.0.40",
-    "@anthropic-ai/sdk": "^0.63.1",
-    "@dqbd/tiktoken": "^1.0.21",
     "@emotion/react": "^11.14.0",
     "@emotion/styled": "^11.14.1",
     "ai": "^5.0.56",
+    "ai-tokenizer": "^1.0.3",
     "cmdk": "^1.0.0",
     "crc-32": "^1.2.2",
     "diff": "^8.0.2",
@@ -61,13 +59,11 @@
     "undici": "^7.16.0",
     "write-file-atomic": "^6.0.0",
     "zod": "^4.1.11",
-    "zod-to-json-schema": "^3.24.6",
-    "ai-tokenizer": "^1.0.3"
+    "zod-to-json-schema": "^3.24.6"
   },
   "devDependencies": {
     "@eslint/js": "^9.36.0",
     "@playwright/test": "^1.56.0",
-    "@testing-library/react": "^16.3.0",
     "@types/bun": "^1.2.23",
     "@types/diff": "^8.0.0",
     "@types/jest": "^30.0.0",

scripts/check_bundle_size.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+# Tracks bundle sizes and fails if main.js grows too much
+# Large main.js usually indicates eager imports of heavy dependencies
+
+set -euo pipefail
+
+MAIN_JS_MAX_KB=${MAIN_JS_MAX_KB:-20} # 20KB for main.js (currently ~15KB)
+
+if [ ! -f "dist/main.js" ]; then
+  echo "❌ dist/main.js not found. Run 'make build' first."
+  exit 1
+fi
+
+# Get file size (cross-platform: macOS and Linux)
+if stat -f%z dist/main.js >/dev/null 2>&1; then
+  # macOS
+  main_size=$(stat -f%z dist/main.js)
+else
+  # Linux
+  main_size=$(stat -c%s dist/main.js)
+fi
+
+main_kb=$((main_size / 1024))
+
+echo "Bundle sizes:"
+echo "  dist/main.js: ${main_kb}KB (max: ${MAIN_JS_MAX_KB}KB)"
+
+if [ $main_kb -gt $MAIN_JS_MAX_KB ]; then
+  echo "❌ BUNDLE SIZE REGRESSION: main.js (${main_kb}KB) exceeds ${MAIN_JS_MAX_KB}KB"
+  echo ""
+  echo "This usually means new eager imports were added to main process."
+  echo "Check for imports in src/main.ts, src/config.ts, or src/preload.ts"
+  echo ""
+  echo "Run './scripts/check_eager_imports.sh' to identify the issue."
+  exit 1
+fi
+
+echo "✅ Bundle size OK"

scripts/check_eager_imports.sh

@@ -0,0 +1,61 @@
+#!/usr/bin/env bash
+# Detects eager imports of AI SDK packages in main process
+# These packages are large and must be lazy-loaded to maintain fast startup time
+
+set -euo pipefail
+
+# Files that should NOT have eager AI SDK imports
+CRITICAL_FILES=(
+  "src/main.ts"
+  "src/config.ts"
+  "src/preload.ts"
+)
+
+# Packages that should be lazily loaded
+BANNED_IMPORTS=(
+  "@ai-sdk/anthropic"
+  "@ai-sdk/openai"
+  "@ai-sdk/google"
+  "ai"
+)
+
+failed=0
+
+echo "Checking for eager AI SDK imports in critical startup files..."
+
+for file in "${CRITICAL_FILES[@]}"; do
+  if [ ! -f "$file" ]; then
+    continue
+  fi
+
+  for pkg in "${BANNED_IMPORTS[@]}"; do
+    # Check for top-level imports (not dynamic)
+    if grep -E "^import .* from ['\"]$pkg" "$file" >/dev/null 2>&1; then
+      echo "❌ EAGER IMPORT DETECTED: $file imports '$pkg'"
+      echo "   AI SDK packages must use dynamic import() in critical path"
+      failed=1
+    fi
+  done
+done
+
+# Also check dist/main.js for require() calls (if it exists)
+if [ -f "dist/main.js" ]; then
+  echo "Checking bundled main.js for eager requires..."
+  for pkg in "${BANNED_IMPORTS[@]}"; do
+    if grep "require(\"$pkg\")" dist/main.js >/dev/null 2>&1; then
+      echo "❌ BUNDLED EAGER IMPORT: dist/main.js requires '$pkg'"
+      echo "   This means a critical file is importing AI SDK eagerly"
+      failed=1
+    fi
+  done
+fi
+
+if [ $failed -eq 1 ]; then
+  echo ""
+  echo "To fix: Use dynamic imports instead:"
+  echo "  ✅ const { createAnthropic } = await import('@ai-sdk/anthropic');"
+  echo "  ❌ import { createAnthropic } from '@ai-sdk/anthropic';"
+  exit 1
+fi
+
+echo "✅ No eager AI SDK imports detected"

src/main.ts

@@ -39,6 +39,17 @@ if (!app.isPackaged) {
   }
 }
 
+// IMPORTANT: Lazy-load heavy dependencies to maintain fast startup time
+//
+// To keep startup time under 4s, avoid importing AI SDK packages at the top level.
+// These files MUST use dynamic import():
+//   - main.ts, config.ts, preload.ts (startup-critical)
+//
+// ✅ GOOD: const { createAnthropic } = await import("@ai-sdk/anthropic");
+// ❌ BAD:  import { createAnthropic } from "@ai-sdk/anthropic";
+//
+// Enforcement: scripts/check_eager_imports.sh validates this in CI
+//
 // Lazy-load Config and IpcMain to avoid loading heavy AI SDK dependencies at startup
 // These will be loaded on-demand when createWindow() is called
 let config: Config | null = null;