diff --git a/.opencode/tools/multi-model.test.ts b/.opencode/multi-model.test.ts
similarity index 98%
rename from .opencode/tools/multi-model.test.ts
rename to .opencode/multi-model.test.ts
index 7d58d99..6993907 100644
--- a/.opencode/tools/multi-model.test.ts
+++ b/.opencode/multi-model.test.ts
@@ -1,9 +1,9 @@
 import { expect, test, mock, spyOn, beforeEach, afterEach, describe } from "bun:test";
 import * as fs from "node:fs";
 import * as os from "node:os";
-import multiModelTool from "./multi-model";
+import multiModelTool from "./tools/multi-model";
 
-let originalBun$: typeof Bun.$;
+let originalBun$: typeof Bun.$ = (globalThis as any).Bun?.$;
 let mockCommandResponses: Record<string, { ok: boolean; stdout: string; stderr: string }> = {};
 
 function setupMockBun$() {
diff --git a/.opencode/package.json b/.opencode/package.json
index f415a09..e87e407 100644
--- a/.opencode/package.json
+++ b/.opencode/package.json
@@ -9,6 +9,7 @@
     "@opencode-ai/plugin": "1.2.24"
   },
   "devDependencies": {
+    "@types/bun": "^1.3.10",
     "@types/node": "^25.5.0"
   }
 }
diff --git a/.opencode/tools/multi-model.ts b/.opencode/tools/multi-model.ts
index 46e48a4..b23316f 100644
--- a/.opencode/tools/multi-model.ts
+++ b/.opencode/tools/multi-model.ts
@@ -182,15 +182,15 @@ function levenshtein(left: string, right: string): number {
       const cost = left[leftIndex - 1] === right[rightIndex - 1] ? 0 : 1;
 
       row[rightIndex] = Math.min(
-        row[rightIndex] + 1,
-        row[rightIndex - 1] + 1,
-        previous + cost,
+        row[rightIndex]! + 1,
+        row[rightIndex - 1]! + 1,
+        previous! + cost,
       );
       previous = current;
     }
   }
 
-  return row[right.length];
+  return row[right.length]!;
 }
 
 /**
@@ -242,7 +242,7 @@ function suggestModels(requested: string, allowlist: string[]): string[] {
  * ```
  */
 function formatInvalidModelError(invalidModels: string[], allowlist: string[]): string {
-  const [firstInvalidModel] = invalidModels;
+  const firstInvalidModel = invalidModels[0]!;
   const suggestions = suggestModels(firstInvalidModel, allowlist);
   const suggestionText =
     suggestions.length > 0
@@ -369,7 +369,7 @@ export default tool({
     const failedModels: string[] = [];
 
     for (let i = 0; i < windowPlans.length; i++) {
-      const plan = windowPlans[i];
+      const plan = windowPlans[i]!;
       const isFirst = i === 0;
 
       const worktreePath = getWorktreePath(safeSessionName, plan.windowName);
diff --git a/.opencode/tsconfig.json b/.opencode/tsconfig.json
new file mode 100644
index 0000000..05af1b4
--- /dev/null
+++ b/.opencode/tsconfig.json
@@ -0,0 +1,26 @@
+{
+  "compilerOptions": {
+    "lib": ["ESNext"],
+    "target": "ESNext",
+    "module": "Preserve",
+    "moduleDetection": "force",
+    "jsx": "react-jsx",
+    "allowJs": true,
+
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "noEmit": true,
+
+    "strict": true,
+    "skipLibCheck": true,
+    "noFallthroughCasesInSwitch": true,
+    "noUncheckedIndexedAccess": true,
+    "noImplicitOverride": true,
+
+    "types": [
+      "bun-types"
+    ]
+  },
+  "include": ["**/*.ts", "**/*.tsx"]
+}
\ No newline at end of file