chore(release): 0.0.5

fix: correct path for cli.js in package.json
chore(release): 0.0.4
2026-08-18 21:52:11 +00:00 · 2026-03-21 01:11:36 +05:30 · 2026-03-21 01:11:30 +05:30 · 2026-03-21 01:10:27 +05:30 · 2026-03-21 01:10:21 +05:30 · 2026-03-21 01:05:17 +05:30
19 changed files with 1076 additions and 435 deletions
@@ -0,0 +1,25 @@
+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "type": "node",
+      "request": "launch",
+      "name": "Open Multi-Model Session",
+      "runtimeExecutable": "bun",
+      "program": "${workspaceFolder}/src/cli.ts",
+      "args": ["open", "test/session1", "--models", "openai/gpt-5.2"],
+      "cwd": "${workspaceFolder}",
+      "console": "integratedTerminal"
+    },
+    {
+      "type": "node",
+      "request": "launch",
+      "name": "Close Multi-Model Session",
+      "runtimeExecutable": "bun",
+      "program": "${workspaceFolder}/src/cli.ts",
+      "args": ["close", "test/session1"],
+      "cwd": "${workspaceFolder}",
+      "console": "integratedTerminal"
+    }
+  ]
+}
@@ -0,0 +1,16 @@
+{
+  // The path to the `bun` executable.
+  "bun.runtime": "/path/to/bun",
+
+  // If support for Bun should be added to the default "JavaScript Debug Terminal".
+  "bun.debugTerminal.enabled": true,
+
+  // If the debugger should stop on the first line of the program.
+  "bun.debugTerminal.stopOnEntry": false,
+
+  // Glob pattern to find test files. Defaults to the value shown below.
+  "bun.test.filePattern": "**/*{.test.,.spec.,_test_,_spec_}{js,ts,tsx,jsx,mts,cts,cjs,mjs}",
+
+  // The custom script to call for testing instead of `bun test`
+  "bun.test.customScript": "bun test",
+}
@@ -13,7 +13,7 @@ Add to your OpenCode config (`opencode.json`):

 ```json
 {
-  "plugin": ["@username/opencode-multi-model"]
+  "plugin": ["opencode-multi-model"]
 }
 ```

@@ -21,10 +21,10 @@ Add to your OpenCode config (`opencode.json`):

 ```bash
 # Using bunx (no install)
-bunx @username/opencode-multi-model open my-session -m openai/gpt-5.2 anthropic/claude-3-5-sonnet
+bunx opencode-multi-model open my-session -m openai/gpt-5.2 anthropic/claude-3-5-sonnet

 # Or install globally
-bun install -g @username/opencode-multi-model
+bun install -g opencode-multi-model
 opencode-multi-model open my-session -m openai/gpt-5.2
 ```

@@ -34,7 +34,7 @@ If you installed it via bun and want to use it as a project tool, import it from

 ```typescript
 // .opencode/tools/multi-model.ts
-import { openTool as open, closeTool as close } from "@username/opencode-multi-model"
+import { openTool as open, closeTool as close } from "opencode-multi-model"
 export { open, close }
 ```

@@ -153,7 +153,7 @@ bun dist/cli.js close test-session
 │   ├── types.ts               # Shared TypeScript types
 │   ├── core/
 │   │   ├── index.ts           # Core exports
-│   │   ├── launch.ts          # Launch session logic
+│   │   ├── open.ts            # Launch session logic
 │   │   ├── close.ts           # Close session logic
 │   │   └── utils.ts           # Helper functions
 │   └── tools/
@@ -166,6 +166,19 @@ bun dist/cli.js close test-session
 └── README.md
 ```

+## Local code coverage
+
+The test suite can generate a coverage report locally.
+
+```bash
+# Run tests with coverage (HTML report generated in ./coverage)
+  npm run coverage   # or: bun run coverage
+# Open the HTML report
+ open coverage/index.html   # macOS
+```
+
+The `coverage` directory is ignored by Git but can be inspected to see which lines are exercised.
+
 ## License

 MIT
@@ -6,6 +6,7 @@
      "name": "@username/opencode-multi-model",
      "dependencies": {
        "@opencode-ai/plugin": "^1.2.27",
+        "chalk": "^5.3.0",
        "commander": "^12.0.0",
      },
      "devDependencies": {
@@ -25,6 +26,8 @@

    "bun-types": ["bun-types@1.3.11", "", { "dependencies": { "@types/node": "*" } }, "sha512-1KGPpoxQWl9f6wcZh57LvrPIInQMn2TQ7jsgxqpRzg+l0QPOFvJVH7HmvHo/AiPgwXy+/Thf6Ov3EdVn1vOabg=="],

+    "chalk": ["chalk@5.6.2", "", {}, "sha512-7NzBL0rN6fMUW+f7A6Io4h40qQlG+xGmtMxfbnH/K7TAtt8JQWVQK+6g0UXKMeVJoyV5EkkNsErQ8pVD3bLHbA=="],
+
    "commander": ["commander@12.1.0", "", {}, "sha512-Vw8qHK3bZM9y/P10u3Vib8o/DdkvA2OtPtZvD871QKjy74Wj1WSKFILMPRPSdUSx5RFK1arlJzEtA4PkFgnbuA=="],

    "undici-types": ["undici-types@7.18.2", "", {}, "sha512-AsuCzffGHJybSaRrmr5eHr81mwJU3kjw6M+uprWvCXiNeN9SOGwQ3Jn8jb8m3Z6izVgknn1R0FTCEAP2QrLY/w=="],
@@ -1,11 +1,11 @@
 {
-  "name": "@username/opencode-multi-model",
-  "version": "1.0.0",
+  "name": "opencode-multi-model",
+  "version": "0.0.5",
  "description": "Launch multiple AI models in tmux sessions - OpenCode Plugin, CLI, and Project Tool",
  "type": "module",
  "main": "./dist/index.js",
  "bin": {
-    "opencode-multi-model": "./dist/cli.js"
+    "opencode-multi-model": "dist/cli.js"
  },
  "exports": {
    ".": "./dist/index.js",
@@ -19,9 +19,12 @@
  "scripts": {
    "build": "bun build src/index.ts src/cli.ts --outdir dist --target bun --format esm",
    "test": "bun test",
-    "prepublishOnly": "bun run build"
+    "coverage": "bun test --coverage",
+    "prepublishOnly": "bun run build",
+    "release": "bash ./scripts/release.sh"
  },
  "dependencies": {
+    "chalk": "^5.3.0",
    "@opencode-ai/plugin": "^1.2.27",
    "commander": "^12.0.0"
  },
@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+set -e
+
+# Prompt for version bump type
+read -p "Select version bump (major/minor/patch): " bump
+if [[ ! "$bump" =~ ^(major|minor|patch)$ ]]; then
+  echo "Invalid choice. Must be 'major', 'minor', or 'patch'."
+  exit 1
+fi
+
+# Run tests
+echo "Running test suite..."
+npm test
+
+# Build the project
+echo "Building the project..."
+npm run build
+
+# Bump version
+echo "Bumping version ($bump)..."
+npm version "$bump" -m "chore(release): %s"
+
+# Show git status
+git status
+
+# Confirm publishing
+read -p "Proceed with npm publish? (y/N): " confirm
+if [[ "$confirm" != "y" && "$confirm" != "Y" ]]; then
+  echo "Publish aborted."
+  exit 0
+fi
+
+# Publish to npm
+npm publish
+
+# Push git commits and tags
+git push && git push --tags
+
+echo "Release completed successfully."
@@ -1,6 +1,6 @@
 #!/usr/bin/env bun
 import { Command } from "commander";
-import { launchMultiModel } from "./core/launch";
+import { openMultiModel } from "./core/open";
 import { closeMultiModel } from "./core/close";
 import { getBinaryName } from "./core/utils";

@@ -21,7 +21,7 @@ program
    try {
      const binaryName = options.binary || getBinaryName();

-      const result = await launchMultiModel({
+      const result = await openMultiModel({
        sessionName,
        models: options.models,
        binaryName,
@@ -54,20 +54,8 @@ program
        force: options.force,
      });

-      if (result.success) {
-        console.log(`Closed session: ${result.sessionName}`);
-        if (result.cleanupPerformed) {
-          console.log(`  Removed ${result.worktreesRemoved?.length || 0} worktrees`);
-          if (result.tagsCreated && result.tagsCreated.length > 0) {
-            console.log(`  Created backup tags: ${result.tagsCreated.join(", ")}`);
-          }
-          if (result.warnings && result.warnings.length > 0) {
-            console.log(`  Warnings: ${result.warnings.join("; ")}`);
-          }
-          if (result.branchesDeleted && result.branchesDeleted.length > 0) {
-            console.log(`  Deleted ${result.branchesDeleted.length} branches`);
-          }
-        }
+if (result.success) {
+          console.log(result.instructions);
        } else {
        console.error(`Failed: ${result.error}`);
        process.exit(1);
@@ -1,6 +1,7 @@
 import * as readline from "node:readline";
+import chalk from 'chalk'; // removed console usage
 import type { CloseSessionOptions, CloseSessionResult } from "../types";
-import { runCommand, getSessionPath, getWorktreesForSession } from "./utils";
+import { runCommand, getSessionPath, getWorktreesForSession, sanitizeName } from "./utils";

 /**
 * Prompts the user for input on the terminal.
@@ -45,33 +46,42 @@ async function promptUser(question: string): Promise<string> {
 */
 export async function closeMultiModel(options: CloseSessionOptions): Promise<CloseSessionResult> {
  const worktreesRemoved: string[] = [];
+  const instructionsArr: string[] = [];
  const branchesDeleted: string[] = [];
  const tagsCreated: string[] = [];
-  const warnings: string[] = [];

+
+  const safeSessionName = sanitizeName(options.sessionName);
  try {
    // Check if session exists
-    const { ok: sessionExists } = await runCommand(["tmux", "has-session", "-t", options.sessionName]);
+    const { ok: sessionExists } = await runCommand(["tmux", "has-session", "-t", safeSessionName]);

    // Kill tmux session if it exists
    if (sessionExists) {
-      await runCommand(["tmux", "kill-session", "-t", options.sessionName]);
+      await runCommand(["tmux", "kill-session", "-t", safeSessionName]);
+      instructionsArr.push(chalk.green(`Closed session '${safeSessionName}'`));
+    } else {
+      instructionsArr.push(chalk.yellow(`Session '${safeSessionName}' does not exist`));
    }

    // Get list of worktrees for this session before killing tmux
-    const worktrees = await getWorktreesForSession(options.sessionName);
+    const worktrees = await getWorktreesForSession(safeSessionName);

    // If cleanup requested and not forced, ask for confirmation
    if (options.cleanupWorktrees && !options.force && worktrees.length > 0) {
-      console.log(`\nThe following worktrees and branches will be removed:`);
-      worktrees.forEach((wt) => console.log(`  - ${wt.path} (branch: ${wt.branch})`));
+      instructionsArr.push(chalk.red('The following worktrees and branches will be removed:'));
+      worktrees.forEach((wt) => {
+        const msg = `  - ${wt.path} (branch: ${wt.branch})`;
+        instructionsArr.push(msg.trim());
+      });

-      const answer = await promptUser("\nDo you want to proceed? (y/N): ");
+      const answer = await promptUser(chalk.bold("\nDo you want to proceed? (y/N): "));
      if (answer.toLowerCase() !== "y" && answer.toLowerCase() !== "yes") {
        return {
          success: false,
-          sessionName: options.sessionName,
+          sessionName: safeSessionName,
          error: "Cleanup cancelled by user",
+          instructions: instructionsArr.join("\n"),
        };
      }
    }
@@ -94,20 +104,19 @@ export async function closeMultiModel(options: CloseSessionOptions): Promise<Clo
          if (tagResult.ok) {
            tagsCreated.push(archiveTag);
          } else {
-            const warningMsg = `Failed to create tag ${archiveTag} for branch ${worktree.branch}.`;
-            warnings.push(warningMsg);
-            console.warn(`Warning: ${warningMsg}`);
+const warningMsg = chalk.red(`Warning: Failed to create tag ${archiveTag} for branch ${worktree.branch}.`);
+              instructionsArr.push(warningMsg);
          }

          await runCommand(["git", "branch", "-D", worktree.branch]);
          branchesDeleted.push(worktree.branch);
        } catch (err) {
-          console.warn(`Warning: Failed to cleanup worktree ${worktree.path}: ${err}`);
+            instructionsArr.push(chalk.red(`Failed to cleanup worktree ${worktree.path}: ${err}`));
        }
      }

      // Also remove the base directory
-      const worktreeBase = getSessionPath(options.sessionName);
+      const worktreeBase = getSessionPath(safeSessionName);
      try {
        await runCommand(["rm", "-rf", worktreeBase]);
      } catch {
@@ -115,26 +124,32 @@ export async function closeMultiModel(options: CloseSessionOptions): Promise<Clo
      }

      cleanupPerformed = worktreesRemoved.length > 0;
+      if (cleanupPerformed) {
+        instructionsArr.push(chalk.dim(`Removed ${worktreesRemoved.length} worktrees, alongwith their branches.`));
+        if (tagsCreated.length > 0) {
+          instructionsArr.push(chalk.dim(`Created archive tags: ${tagsCreated.join(", ")}.`));
+        }
+      }
    }

-    return {
+return {
       success: true,
-      sessionName: options.sessionName,
+       sessionName: safeSessionName,
       cleanupPerformed,
       worktreesRemoved,
       branchesDeleted,
       tagsCreated,
-      warnings,
+       instructions: instructionsArr.join("\n"),
     };
  } catch (error) {
-    return {
+return {
        success: false,
-      sessionName: options.sessionName,
+        sessionName: safeSessionName,
        error: String(error),
        worktreesRemoved,
        branchesDeleted,
        tagsCreated,
-      warnings,
+        instructions: instructionsArr.join("\n"),
      };
  }
 }
@@ -1,3 +1,3 @@
-export { launchMultiModel } from "./launch";
+export { openMultiModel } from "./open";
 export { closeMultiModel } from "./close";
 export * from "./utils";
@@ -1,4 +1,5 @@
 import * as fs from "node:fs";
+import chalk from 'chalk';
 import type { MultiModelOptions, MultiModelResult } from "../types";
 import {
  runCommand,
@@ -24,7 +25,7 @@ import {
 *
 * @example
 * ```ts
- * const result = await launchMultiModel({
+ * const result = await openMultiModel({
 *   sessionName: "compare",
 *   models: ["openai/gpt-5.2", "anthropic/claude-3-5-sonnet"],
 *   binaryName: "opencode",
@@ -34,7 +35,7 @@ import {
 * }
 * ```
 */
-export async function launchMultiModel(options: MultiModelOptions): Promise<MultiModelResult> {
+export async function openMultiModel(options: MultiModelOptions): Promise<MultiModelResult> {
  const sessionName = options.sessionName.trim();
  const safeSessionName = sanitizeName(sessionName);
  const models = normalizeModels(options.models);
@@ -153,7 +154,9 @@ export async function launchMultiModel(options: MultiModelOptions): Promise<Mult
      if (!sessionCreateResult.ok) {
        const undoErrors = await undoWorktree(worktreePath, branchName);
        let errorMsg = `Error: Failed to create tmux session '${sessionName}'.${sessionCreateResult.stderr ? ` ${sessionCreateResult.stderr}` : ""}`;
-        if (undoErrors.length > 0) errorMsg += ` Cleanup errors: ${undoErrors.join(", ")}`;
+        if (undoErrors.length > 0) {
+          errorMsg += ` Cleanup errors: ${undoErrors.join(", ")}`;
+        }
        return { success: false, sessionName, error: errorMsg };
      }
    } else {
@@ -172,7 +175,9 @@ export async function launchMultiModel(options: MultiModelOptions): Promise<Mult
      if (!windowCreateResult.ok) {
        failedModels.push(`${plan.model} (${windowCreateResult.stderr || "failed to create window"})`);
        const undoErrors = await undoWorktree(worktreePath, branchName);
-        if (undoErrors.length > 0) failedModels.push(`cleanup failed for ${plan.model}: ${undoErrors.join(", ")}`);
+        if (undoErrors.length > 0) {
+          failedModels.push(`cleanup failed for ${plan.model}: ${undoErrors.join(", ")}`);
+        }
        continue;
      }
    }
@@ -201,13 +206,17 @@ export async function launchMultiModel(options: MultiModelOptions): Promise<Mult
      sessionName,
      windows: windowNames,
      instructions: [
-        `Error: Created tmux session '${sessionName}', but some model launches failed.`,
-        `Succeeded: ${succeededModels.length > 0 ? succeededModels.join(", ") : "none"}.`,
-        `Failed: ${failedModels.join(", ")}.`,
-        `Attach with \`${attachCommand}\` to inspect the session.`,
-        `Cleanup when done using either:`,
-        `1. ${primaryCleanup}`,
-        `2. Or run manually: \`${cleanupCommand}\``,
+        chalk.red(`Error: Created tmux session '${sessionName}', but some model launches failed.`),
+        chalk.red(`Failed: ${failedModels.join(", ")}.`),
+        chalk.dim(`Succeeded: ${succeededModels.length > 0 ? succeededModels.join(", ") : "none"}.`),
+        "",
+        chalk.bold(`Attach with \`${attachCommand}\` to inspect the session.`),
+        "",
+        chalk.dim(`When finished, clean up using:`),
+        primaryCleanup,
+        "",
+        chalk.dim(`Alternate manual cleanup - `),
+        chalk.dim(cleanupCommand)
      ].join("\n"),
    };
  }
@@ -217,10 +226,13 @@ export async function launchMultiModel(options: MultiModelOptions): Promise<Mult
    sessionName,
    windows: windowNames,
    instructions: [
-      `Use \`${attachCommand}\` to join session.`,
-      `When finished, clean up using either:`,
-      `1. ${primaryCleanup}`,
-      `2. Or run manually: \`${cleanupCommand}\``,
+      chalk.bold(`Use \`${attachCommand}\` to join session.`),
+      "",
+      chalk.dim(`When finished, clean up using:`),
+      primaryCleanup,
+      "",
+      chalk.dim(`Alternate manual cleanup - `),
+      chalk.dim(cleanupCommand)
    ].join("\n"),
  };
 }
@@ -332,7 +332,7 @@ export async function getWorktreesForSession(sessionName: string): Promise<Workt
  const { stdout } = await runCommand(["git", "worktree", "list", "--porcelain"]);
  const worktrees: WorktreeInfo[] = [];

-  const sessionPath = getSessionPath(sessionName);
+  const sessionPath = getSessionPath(sanitizeName(sessionName));

  let currentWorktree: Partial<WorktreeInfo> = {};

@@ -25,17 +25,6 @@ export const closeTool = tool({
      return result.error!;
    }

-    let details = "";
-    if (result.cleanupPerformed) {
-      details += ` Removed ${result.worktreesRemoved?.length || 0} worktrees.`;
-      if (result.tagsCreated && result.tagsCreated.length > 0) {
-        details += ` Created backup tags: ${result.tagsCreated.join(", ")}.`;
-      }
-      if (result.warnings && result.warnings.length > 0) {
-        details += ` Warnings: ${result.warnings.join("; ")}.`;
-      }
-    }
-
-    return `Session "${result.sessionName}" has been closed.${details}`;
+    return result.instructions;
  },
 });
@@ -1,5 +1,5 @@
 import { tool } from "@opencode-ai/plugin";
-import { launchMultiModel } from "../core/launch";
+import { openMultiModel } from "../core/open";
 import { getBinaryName } from "../core/utils";

 /**
@@ -20,7 +20,7 @@ export const openTool = tool({
  async execute(args, context) {
    const binaryName = getBinaryName();

-    const result = await launchMultiModel({
+    const result = await openMultiModel({
      sessionName: args.sessionName,
      models: args.models,
      binaryName,
@@ -44,6 +44,8 @@ export interface CloseSessionOptions {
 * Result returned after attempting to close a multi-model session.
 */
 export interface CloseSessionResult {
+  /** Console messages and instructions. */
+  instructions: string;
  /** Whether the close succeeded. */
  success: boolean;
  /** The session name that was closed. */
@@ -58,8 +60,7 @@ export interface CloseSessionResult {
  branchesDeleted?: string[];
  /** Archive tags that were created before branch deletion. */
  tagsCreated?: string[];
-  /** Warning messages. */
-  warnings?: string[];
+
 }

 /**
@@ -0,0 +1,223 @@
+import { expect, test, mock, spyOn, beforeEach, afterEach, describe } from "bun:test";
+import * as os from "node:os";
+import * as readline from "node:readline";
+import { closeMultiModel } from "../src/core/close";
+
+let originalBun$: typeof Bun.$ = (globalThis as any).Bun?.$;
+let mockCommandResponses: Record<string, { ok: boolean; stdout: string; stderr: string }> = {};
+let executedCommands: string[] = [];
+
+function setupMockBun$() {
+  const mockFn = mock((strings: TemplateStringsArray, ...values: any[]) => {
+    const parts = values[0] as string[];
+    const commandSignature = parts.join(" ");
+    executedCommands.push(commandSignature);
+    const response = mockCommandResponses[commandSignature] ?? { ok: true, stdout: "", stderr: "" };
+    return {
+      quiet: () => ({
+        nothrow: async () => ({
+          exitCode: response.ok ? 0 : 1,
+          stdout: { toString: () => response.stdout },
+          stderr: { toString: () => response.stderr },
+        }),
+      }),
+    };
+  });
+  (globalThis as any).Bun.$ = mockFn;
+  return mockFn;
+}
+
+function restoreOriginalBun$() {
+  (globalThis as any).Bun.$ = originalBun$;
+}
+
+describe("closeMultiModel", () => {
+  let bunMock: ReturnType<typeof setupMockBun$>;
+
+  beforeEach(() => {
+    spyOn(os, "homedir").mockReturnValue("/home/user");
+    bunMock = setupMockBun$();
+    executedCommands = [];
+    mockCommandResponses = {};
+  });
+
+  afterEach(() => {
+    restoreOriginalBun$();
+  });
+
+  test("kills existing session without cleanup", async () => {
+    mockCommandResponses["tmux has-session -t test-session"] = { ok: true, stdout: "", stderr: "" };
+    mockCommandResponses["tmux kill-session -t test-session"] = { ok: true, stdout: "", stderr: "" };
+    // No worktrees
+    mockCommandResponses["git worktree list --porcelain"] = { ok: true, stdout: "", stderr: "" };
+
+    const result = await closeMultiModel({ sessionName: "test-session", cleanupWorktrees: false, force: false });
+    expect(result.success).toBe(true);
+    expect(result.cleanupPerformed).toBe(false);
+    expect(result.worktreesRemoved).toEqual([]);
+    expect(executedCommands).toContain("tmux has-session -t test-session");
+    expect(executedCommands).toContain("tmux kill-session -t test-session");
+  });
+
+  test("no session exists, no cleanup", async () => {
+    mockCommandResponses["tmux has-session -t test-session"] = { ok: false, stdout: "", stderr: "" };
+    mockCommandResponses["git worktree list --porcelain"] = { ok: true, stdout: "", stderr: "" };
+
+    const result = await closeMultiModel({ sessionName: "test-session", cleanupWorktrees: false, force: false });
+    expect(result.success).toBe(true);
+    expect(result.cleanupPerformed).toBe(false);
+    expect(result.worktreesRemoved).toEqual([]);
+    expect(executedCommands).toContain("tmux has-session -t test-session");
+    // No kill-session should be issued
+    expect(executedCommands.some(c => c.startsWith("tmux kill-session"))).toBe(false);
+  });
+
+  test("cleanup works with worktrees and force, all succeeds", async () => {
+    mockCommandResponses["tmux has-session -t test-session"] = { ok: false, stdout: "", stderr: "" };
+    const worktreePath = "/home/user/.local/share/opencode/multi-model/test-session/model";
+    const worktreeListOutput = `worktree ${worktreePath}\nbranch refs/heads/opencode/test-session/model`;
+    mockCommandResponses["git worktree list --porcelain"] = { ok: true, stdout: worktreeListOutput, stderr: "" };
+    mockCommandResponses[`git worktree remove -f ${worktreePath}`] = { ok: true, stdout: "", stderr: "" };
+    mockCommandResponses["git branch -D opencode/test-session/model"] = { ok: true, stdout: "", stderr: "" };
+    // Tag command will default to ok:true via fallback
+    mockCommandResponses["rm -rf /home/user/.local/share/opencode/multi-model/test-session"] = { ok: true, stdout: "", stderr: "" };
+
+    // Freeze timestamp for deterministic tag name
+    const fixedDate = new Date("2023-01-01T00:00:00.000Z");
+    const OriginalDate = Date;
+    // @ts-ignore
+    global.Date = class extends OriginalDate { constructor() { super(); return fixedDate; } toISOString() { return "2023-01-01T00:00:00.000Z"; } } as any;
+
+    const result = await closeMultiModel({ sessionName: "test-session", cleanupWorktrees: true, force: true });
+    // Restore Date
+    // @ts-ignore
+    global.Date = OriginalDate;
+
+    expect(result.success).toBe(true);
+    expect(result.cleanupPerformed).toBe(true);
+    expect(result.worktreesRemoved).toEqual([worktreePath]);
+    expect(result.branchesDeleted).toEqual(["opencode/test-session/model"]);
+    expect(result.tagsCreated?.length).toBe(1);
+    
+    // Ensure removal commands were executed
+    expect(executedCommands).toContain(`git worktree remove -f ${worktreePath}`);
+    expect(executedCommands).toContain(`git branch -D opencode/test-session/model`);
+  });
+
+  test("user cancels cleanup when not forced", async () => {
+    mockCommandResponses["tmux has-session -t test-session"] = { ok: false, stdout: "", stderr: "" };
+    const worktreePath = "/home/user/.local/share/opencode/multi-model/test-session/model";
+    const worktreeListOutput = `worktree ${worktreePath}\nbranch refs/heads/opencode/test-session/model`;
+    mockCommandResponses["git worktree list --porcelain"] = { ok: true, stdout: worktreeListOutput, stderr: "" };
+
+    // Stub readline to return "n"
+    const mockInterface = {
+      question: (q: string, cb: (a: string) => void) => cb("n"),
+      close: () => {},
+    } as any;
+    spyOn(readline, "createInterface").mockImplementation(() => mockInterface);
+
+    const result = await closeMultiModel({ sessionName: "test-session", cleanupWorktrees: true, force: false });
+    expect(result.success).toBe(false);
+    expect(result.error).toBe("Cleanup cancelled by user");
+  });
+
+  test("user confirms cleanup when not forced", async () => {
+    mockCommandResponses["tmux has-session -t test-session"] = { ok: false, stdout: "", stderr: "" };
+    const worktreePath = "/home/user/.local/share/opencode/multi-model/test-session/model";
+    const worktreeListOutput = `worktree ${worktreePath}\nbranch refs/heads/opencode/test-session/model`;
+    mockCommandResponses["git worktree list --porcelain"] = { ok: true, stdout: worktreeListOutput, stderr: "" };
+
+    // Stub readline to simulate user confirming cleanup (answers "y")
+    const mockInterface = {
+      question: (q: string, cb: (a: string) => void) => cb("y"),
+      close: () => {},
+    } as any;
+    spyOn(readline, "createInterface").mockImplementation(() => mockInterface);
+
+    // Freeze timestamp for deterministic tag name
+    const fixedDate = new Date("2023-01-01T00:00:00.000Z");
+    const OriginalDate = Date;
+    // @ts-ignore
+    global.Date = class extends OriginalDate { constructor() { super(); return fixedDate; } toISOString() { return "2023-01-01T00:00:00.000Z"; } } as any;
+
+    const result = await closeMultiModel({ sessionName: "test-session", cleanupWorktrees: true, force: false });
+
+    // Restore Date after invocation
+    // @ts-ignore
+    global.Date = OriginalDate;
+
+    // Verify result indicates successful cleanup
+    expect(result.success).toBe(true);
+    expect(result.cleanupPerformed).toBe(true);
+    expect(result.worktreesRemoved).toEqual([worktreePath]);
+    expect(result.branchesDeleted).toEqual(["opencode/test-session/model"]);
+    expect(result.tagsCreated?.length).toBe(1);
+    
+
+    // Verify the expected git commands were executed
+    expect(executedCommands).toContain(`git worktree remove -f ${worktreePath}`);
+    expect(executedCommands).toContain(`git branch -D opencode/test-session/model`);
+    const expectedTagCmd = `git tag archive/opencode/test-session/model-2023-01-01T00-00-00-000Z opencode/test-session/model`;
+    expect(executedCommands).toContain(expectedTagCmd);
+  });
+
+  test("warning when tag creation fails", async () => {
+    mockCommandResponses["tmux has-session -t test-session"] = { ok: false, stdout: "", stderr: "" };
+    const worktreePath = "/home/user/.local/share/opencode/multi-model/test-session/model";
+    const worktreeListOutput = `worktree ${worktreePath}\nbranch refs/heads/opencode/test-session/model`;
+    mockCommandResponses["git worktree list --porcelain"] = { ok: true, stdout: worktreeListOutput, stderr: "" };
+    mockCommandResponses[`git worktree remove -f ${worktreePath}`] = { ok: true, stdout: "", stderr: "" };
+    mockCommandResponses["git branch -D opencode/test-session/model"] = { ok: true, stdout: "", stderr: "" };
+    // Tag command will fail
+    const fixedDate = new Date("2023-01-01T00:00:00.000Z");
+    const OriginalDate = Date;
+    // @ts-ignore
+    global.Date = class extends OriginalDate { constructor() { super(); return fixedDate; } toISOString() { return "2023-01-01T00:00:00.000Z"; } } as any;
+    const tagCommand = `git tag archive/opencode/test-session/model-2023-01-01T00-00-00-000Z opencode/test-session/model`;
+    mockCommandResponses[tagCommand] = { ok: false, stdout: "", stderr: "tag error" };
+
+    const result = await closeMultiModel({ sessionName: "test-session", cleanupWorktrees: true, force: true });
+    // Restore Date
+    // @ts-ignore
+    global.Date = OriginalDate;
+
+    expect(result.success).toBe(true);
+    // Expect the warning message to be captured in instructions
+    expect(result.instructions.includes('Failed to create tag')).toBe(true);
+    expect(result.tagsCreated).toEqual([]);
+  });
+
+  test("cleanup works with unsanitized session name", async () => {
+    const unsanitized = "test session!";
+    const sanitized = "test-session"; // result of sanitizeName
+    // tmux lookup uses unsanitized name
+    mockCommandResponses[`tmux has-session -t ${unsanitized}`] = { ok: false, stdout: "", stderr: "" };
+    const worktreePath = `/home/user/.local/share/opencode/multi-model/${sanitized}/model`;
+    const worktreeListOutput = `worktree ${worktreePath}\nbranch refs/heads/opencode/${sanitized}/model`;
+    mockCommandResponses["git worktree list --porcelain"] = { ok: true, stdout: worktreeListOutput, stderr: "" };
+    mockCommandResponses[`git worktree remove -f ${worktreePath}`] = { ok: true, stdout: "", stderr: "" };
+    mockCommandResponses[`git branch -D opencode/${sanitized}/model`] = { ok: true, stdout: "", stderr: "" };
+    mockCommandResponses[`rm -rf /home/user/.local/share/opencode/multi-model/${sanitized}`] = { ok: true, stdout: "", stderr: "" };
+
+    // Freeze timestamp for deterministic tag name
+    const fixedDate = new Date("2023-01-01T00:00:00.000Z");
+    const OriginalDate = Date;
+    // @ts-ignore
+    global.Date = class extends OriginalDate { constructor() { super(); return fixedDate; } toISOString() { return "2023-01-01T00:00:00.000Z"; } } as any;
+
+    const result = await closeMultiModel({ sessionName: unsanitized, cleanupWorktrees: true, force: true });
+    // Restore Date
+    // @ts-ignore
+    global.Date = OriginalDate;
+
+    expect(result.success).toBe(true);
+    expect(result.cleanupPerformed).toBe(true);
+    expect(result.worktreesRemoved).toEqual([worktreePath]);
+    expect(result.branchesDeleted).toEqual([`opencode/${sanitized}/model`]);
+    expect(result.tagsCreated?.length).toBe(1);
+    // Verify that the commands used the sanitized paths for worktree removal and branch deletion
+    expect(executedCommands).toContain(`git worktree remove -f ${worktreePath}`);
+    expect(executedCommands).toContain(`git branch -D opencode/${sanitized}/model`);
+  });
+});
@@ -0,0 +1,53 @@
+import { expect, test, mock, beforeEach, afterEach, describe, spyOn } from "bun:test";
+import * as os from "node:os";
+import { closeMultiModel } from "../src/core/close";
+
+let originalBun$: typeof Bun.$ = (globalThis as any).Bun?.$;
+let mockCommandResponses: Record<string, { ok: boolean; stdout: string; stderr: string }> = {};
+let executedCommands: string[] = [];
+
+function setupMockBun$() {
+  const mockFn = mock((strings: TemplateStringsArray, ...values: any[]) => {
+    const parts = values[0] as string[];
+    const cmd = parts.join(" ");
+    executedCommands.push(cmd);
+    // Simulate throwing error for a specific command
+    if (cmd === "git worktree list --porcelain") {
+      throw new Error("unexpected error");
+    }
+    const response = mockCommandResponses[cmd] ?? { ok: true, stdout: "", stderr: "" };
+    return {
+      quiet: () => ({
+        nothrow: async () => ({
+          exitCode: response.ok ? 0 : 1,
+          stdout: { toString: () => response.stdout },
+          stderr: { toString: () => response.stderr },
+        }),
+      }),
+    };
+  });
+  (globalThis as any).Bun.$ = mockFn;
+  return mockFn;
+}
+
+function restoreOriginalBun$() {
+  (globalThis as any).Bun.$ = originalBun$;
+}
+
+describe("closeMultiModel unexpected error handling", () => {
+  beforeEach(() => {
+    spyOn(os, "homedir").mockReturnValue("/home/user");
+    mockCommandResponses = {};
+    executedCommands = [];
+    setupMockBun$();
+  });
+  afterEach(() => {
+    restoreOriginalBun$();
+  });
+
+  test("catches thrown error and returns failure", async () => {
+    const result = await closeMultiModel({ sessionName: "any-session", cleanupWorktrees: false, force: false });
+    expect(result.success).toBe(false);
+    expect(result.error).toContain("unexpected error");
+  });
+});
@@ -0,0 +1,357 @@
+import { expect, test, mock, spyOn, beforeEach, afterEach, describe } from "bun:test";
+import * as fs from "node:fs";
+import * as os from "node:os";
+import { openMultiModel } from "../src/core/open";
+import {
+  shellQuote,
+  normalizeModels,
+  findDuplicates,
+  createWindowBaseName,
+  createWindowPlans,
+  levenshtein,
+  suggestModels,
+  formatInvalidModelError,
+  sanitizeName,
+  runCommand,
+  getWorktreePath,
+  getSessionPath,
+  undoWorktree,
+  launchModelInWindow,
+  getWorktreesForSession,
+  getBinaryName,
+} from "../src/core/utils";
+
+let originalBun$: typeof Bun.$ = (globalThis as any).Bun?.$;
+let mockCommandResponses: Record<string, { ok: boolean; stdout: string; stderr: string }> = {};
+let executedCommands: string[] = [];
+
+function setupMockBun$() {
+  const mockFn = mock((strings: TemplateStringsArray, ...values: any[]) => {
+    const parts = values[0] as string[];
+    const commandSignature = parts.join(" ");
+
+    executedCommands.push(commandSignature);
+
+    return {
+      quiet: () => ({
+        nothrow: async () => {
+          const response = mockCommandResponses[commandSignature] ?? { ok: true, stdout: "", stderr: "" };
+          return {
+            exitCode: response.ok ? 0 : 1,
+            stdout: { toString: () => response.stdout },
+            stderr: { toString: () => response.stderr },
+          };
+        },
+      }),
+    };
+  });
+
+  (globalThis as any).Bun.$ = mockFn;
+  return mockFn;
+}
+
+function restoreOriginalBun$() {
+  (globalThis as any).Bun.$ = originalBun$;
+}
+
+describe("multi-model launch", () => {
+  let existsSyncMock: ReturnType<typeof spyOn>;
+  let bunMock: ReturnType<typeof setupMockBun$>;
+
+  beforeEach(() => {
+    spyOn(os, "homedir").mockReturnValue("/mock/home");
+    existsSyncMock = spyOn(fs, "existsSync").mockReturnValue(false);
+    bunMock = setupMockBun$();
+    executedCommands = [];
+
+    mockCommandResponses = {
+      "git rev-parse --is-inside-work-tree": { ok: true, stdout: "true", stderr: "" },
+      "command -v tmux": { ok: true, stdout: "/usr/bin/tmux", stderr: "" },
+      "command -v opencode": { ok: true, stdout: "/usr/bin/opencode", stderr: "" },
+      "opencode models": { ok: true, stdout: "openai/gpt-5.2\nanthropic/claude-3-5-sonnet", stderr: "" },
+      "tmux has-session -t test-session": { ok: false, stdout: "", stderr: "session not found" },
+      "git show-ref --verify --quiet refs/heads/opencode/test-session/gpt-5-2": { ok: false, stdout: "", stderr: "" },
+    };
+  });
+
+  afterEach(() => {
+    restoreOriginalBun$();
+  });
+
+  test("fails if session name is empty", async () => {
+    const result = await openMultiModel({
+      sessionName: "",
+      models: ["openai/gpt-5.2"],
+    });
+
+    expect(result.success).toBe(false);
+    expect(result.error).toContain("Error: `sessionName` must not be empty.");
+    expect(executedCommands).toEqual([]);
+  });
+
+  test("fails if no models are provided", async () => {
+    const result = await openMultiModel({
+      sessionName: "test-session",
+      models: [],
+    });
+
+    expect(result.success).toBe(false);
+    expect(result.error).toContain("Error: Model names must not be empty.");
+    expect(executedCommands).toEqual([]);
+  });
+
+  test("fails if duplicate models are provided", async () => {
+    const result = await openMultiModel({
+      sessionName: "test-session",
+      models: ["openai/gpt-5.2", "openai/gpt-5.2"],
+    });
+
+    expect(result.success).toBe(false);
+    expect(result.error).toContain("Duplicate model names are not allowed");
+    expect(executedCommands).toEqual([]);
+  });
+
+  test("fails if not inside a git repository", async () => {
+    mockCommandResponses["git rev-parse --is-inside-work-tree"] = { ok: false, stdout: "", stderr: "not a git repo" };
+
+    const result = await openMultiModel({
+      sessionName: "test-session",
+      models: ["openai/gpt-5.2"],
+    });
+
+    expect(result.success).toBe(false);
+    expect(result.error).toContain("Error: `multi-model` requires a git repository.");
+    expect(executedCommands).toEqual(["git rev-parse --is-inside-work-tree"]);
+  });
+
+  test("fails if tmux is not installed", async () => {
+    mockCommandResponses["command -v tmux"] = { ok: false, stdout: "", stderr: "" };
+
+    const result = await openMultiModel({
+      sessionName: "test-session",
+      models: ["openai/gpt-5.2"],
+    });
+
+    expect(result.success).toBe(false);
+    expect(result.error).toContain("Error: `tmux` is not installed or not on `PATH`.");
+    expect(executedCommands).toEqual([
+      "git rev-parse --is-inside-work-tree",
+      "command -v tmux",
+    ]);
+  });
+
+  test("fails if opencode is not installed", async () => {
+    mockCommandResponses["command -v opencode"] = { ok: false, stdout: "", stderr: "" };
+
+    const result = await openMultiModel({
+      sessionName: "test-session",
+      models: ["openai/gpt-5.2"],
+    });
+
+    expect(result.success).toBe(false);
+    expect(result.error).toContain("Error: `opencode` is not installed or not on `PATH`.");
+    expect(executedCommands).toEqual([
+      "git rev-parse --is-inside-work-tree",
+      "command -v tmux",
+      "command -v opencode",
+    ]);
+  });
+
+  test("fails if model name is not in allowlist", async () => {
+    const result = await openMultiModel({
+      sessionName: "test-session",
+      models: ["invalid/model"],
+    });
+
+    expect(result.success).toBe(false);
+    expect(result.error).toContain("Error: Model name 'invalid/model' not found");
+    expect(executedCommands).toEqual([
+      "git rev-parse --is-inside-work-tree",
+      "command -v tmux",
+      "command -v opencode",
+      "opencode models",
+    ]);
+  });
+
+  test("fails if session already exists", async () => {
+    mockCommandResponses["tmux has-session -t test-session"] = { ok: true, stdout: "", stderr: "" };
+
+    const result = await openMultiModel({
+      sessionName: "test-session",
+      models: ["openai/gpt-5.2"],
+    });
+
+    expect(result.success).toBe(false);
+    expect(result.error).toContain("Error: Session already exists");
+    expect(executedCommands).toEqual([
+      "git rev-parse --is-inside-work-tree",
+      "command -v tmux",
+      "command -v opencode",
+      "opencode models",
+      "tmux has-session -t test-session",
+    ]);
+  });
+
+  test("successfully plans and executes tmux launch with single model", async () => {
+    const result = await openMultiModel({
+      sessionName: "test-session",
+      models: ["openai/gpt-5.2"],
+    });
+
+    expect(result.success).toBe(true);
+    expect(result.instructions).toContain("Use `tmux attach -t test-session` to join session");
+    expect(executedCommands.some(c => c.startsWith("tmux new-session -d -s test-session -n gpt-5-2"))).toBe(true);
+    expect(executedCommands.some(c => c.startsWith("tmux send-keys -t test-session:gpt-5-2"))).toBe(true);
+  });
+
+  test("successfully launches multiple models", async () => {
+    mockCommandResponses["git show-ref --verify --quiet refs/heads/opencode/test-session/claude-3-5-sonnet"] = { ok: false, stdout: "", stderr: "" };
+
+    const result = await openMultiModel({
+      sessionName: "test-session",
+      models: ["openai/gpt-5.2", "anthropic/claude-3-5-sonnet"],
+    });
+
+    expect(result.success).toBe(true);
+    expect(result.instructions).toContain("Use `tmux attach -t test-session` to join session");
+    expect(executedCommands.some(c => c.startsWith("tmux new-session -d -s test-session -n gpt-5-2"))).toBe(true);
+    expect(executedCommands.some(c => c.startsWith("tmux new-window -d -t test-session -n claude-3-5-sonnet"))).toBe(true);
+  });
+
+  test("sanitizes session name", async () => {
+    mockCommandResponses["tmux has-session -t test session!"] = { ok: false, stdout: "", stderr: "" };
+    mockCommandResponses["git show-ref --verify --quiet refs/heads/opencode/test-session/gpt-5-2"] = { ok: false, stdout: "", stderr: "" };
+
+    const result = await openMultiModel({
+      sessionName: "test session!",
+      models: ["openai/gpt-5.2"],
+    });
+
+    expect(result.success).toBe(true);
+    expect(result.instructions).toContain("Use `tmux attach -t test session!` to join session");
+    expect(executedCommands.some(c => c.startsWith("git worktree add -b opencode/test-session/gpt-5-2"))).toBe(true);
+  });
+
+  test("fails if tmux new-session fails for the first model and triggers undo", async () => {
+    mockCommandResponses["tmux new-session -d -s test-session -n gpt-5-2 -c /mock/home/.local/share/opencode/multi-model/test-session/gpt-5-2"] = { ok: false, stdout: "", stderr: "tmux error" };
+    mockCommandResponses["git worktree remove -f /mock/home/.local/share/opencode/multi-model/test-session/gpt-5-2"] = { ok: true, stdout: "", stderr: "" };
+    mockCommandResponses["git branch -D opencode/test-session/gpt-5-2"] = { ok: true, stdout: "", stderr: "" };
+
+    const result = await openMultiModel({
+      sessionName: "test-session",
+      models: ["openai/gpt-5.2"],
+    });
+
+    expect(result.success).toBe(false);
+    expect(result.error).toContain("Failed to create tmux session");
+    expect(executedCommands).toEqual([
+      "git rev-parse --is-inside-work-tree",
+      "command -v tmux",
+      "command -v opencode",
+      "opencode models",
+      "tmux has-session -t test-session",
+      "git show-ref --verify --quiet refs/heads/opencode/test-session/gpt-5-2",
+      "git worktree add -b opencode/test-session/gpt-5-2 /mock/home/.local/share/opencode/multi-model/test-session/gpt-5-2",
+      "tmux new-session -d -s test-session -n gpt-5-2 -c /mock/home/.local/share/opencode/multi-model/test-session/gpt-5-2",
+      "git worktree remove -f /mock/home/.local/share/opencode/multi-model/test-session/gpt-5-2",
+      "git branch -D opencode/test-session/gpt-5-2",
+    ]);
+  });
+
+  test("fails if worktree path exists for first model", async () => {
+    existsSyncMock.mockImplementation((path: string) => {
+      return path.includes("test-session/gpt-5-2");
+    });
+
+    const result = await openMultiModel({
+      sessionName: "test-session",
+      models: ["openai/gpt-5.2"],
+    });
+
+    expect(result.success).toBe(false);
+    expect(result.error).toContain("Worktree path already exists");
+    expect(executedCommands).toEqual([
+      "git rev-parse --is-inside-work-tree",
+      "command -v tmux",
+      "command -v opencode",
+      "opencode models",
+      "tmux has-session -t test-session",
+    ]);
+  });
+
+  test("fails if git branch exists for first model", async () => {
+    mockCommandResponses["git show-ref --verify --quiet refs/heads/opencode/test-session/gpt-5-2"] = { ok: true, stdout: "", stderr: "" };
+
+    const result = await openMultiModel({
+      sessionName: "test-session",
+      models: ["openai/gpt-5.2"],
+    });
+
+    expect(result.success).toBe(false);
+    expect(result.error).toContain("Branch 'opencode/test-session/gpt-5-2' already exists");
+    expect(executedCommands).toEqual([
+      "git rev-parse --is-inside-work-tree",
+      "command -v tmux",
+      "command -v opencode",
+      "opencode models",
+      "tmux has-session -t test-session",
+      "git show-ref --verify --quiet refs/heads/opencode/test-session/gpt-5-2",
+    ]);
+  });
+
+  test("fails if git worktree add fails for first model", async () => {
+    mockCommandResponses["git worktree add -b opencode/test-session/gpt-5-2 /mock/home/.local/share/opencode/multi-model/test-session/gpt-5-2"] = { ok: false, stdout: "", stderr: "git error" };
+
+    const result = await openMultiModel({
+      sessionName: "test-session",
+      models: ["openai/gpt-5.2"],
+    });
+
+    expect(result.success).toBe(false);
+    expect(result.error).toContain("Failed to create worktree");
+    expect(executedCommands).toEqual([
+      "git rev-parse --is-inside-work-tree",
+      "command -v tmux",
+      "command -v opencode",
+      "opencode models",
+      "tmux has-session -t test-session",
+      "git show-ref --verify --quiet refs/heads/opencode/test-session/gpt-5-2",
+      "git worktree add -b opencode/test-session/gpt-5-2 /mock/home/.local/share/opencode/multi-model/test-session/gpt-5-2",
+    ]);
+  });
+
+  test("model name collision creates unique window names", async () => {
+    mockCommandResponses["opencode models"] = { ok: true, stdout: "openai/gpt-5.2\nanthropic/gpt-5.2", stderr: "" };
+    mockCommandResponses["git show-ref --verify --quiet refs/heads/opencode/test-session/gpt-5-2"] = { ok: false, stdout: "", stderr: "" };
+    mockCommandResponses["git show-ref --verify --quiet refs/heads/opencode/test-session/gpt-5-2-2"] = { ok: false, stdout: "", stderr: "" };
+
+    const result = await openMultiModel({
+      sessionName: "test-session",
+      models: ["openai/gpt-5.2", "anthropic/gpt-5.2"],
+    });
+
+    expect(result.success).toBe(true);
+    expect(result.instructions).toContain("Use `tmux attach -t test-session` to join session");
+    expect(executedCommands.some(c => c.startsWith("tmux new-session -d -s test-session -n gpt-5-2"))).toBe(true);
+    expect(executedCommands.some(c => c.startsWith("tmux new-window -d -t test-session -n gpt-5-2-2"))).toBe(true);
+  });
+
+  test("long model name is truncated in window name", async () => {
+    const longModel = "verylongmodelfrontexampleprovider";
+    mockCommandResponses["opencode models"] = { ok: true, stdout: longModel, stderr: "" };
+    mockCommandResponses[`git show-ref --verify --quiet refs/heads/opencode/test-session/${longModel.slice(0, 24)}`] = { ok: false, stdout: "", stderr: "" };
+
+    const result = await openMultiModel({
+      sessionName: "test-session",
+      models: [longModel],
+    });
+
+    expect(result.success).toBe(true);
+    expect(result.instructions).toContain("Use `tmux attach -t test-session` to join session");
+    const windowName = executedCommands.find(c => c.includes("tmux new-session"))?.match(/-n (\S+)/)?.[1];
+    expect(windowName?.length).toBeLessThanOrEqual(24);
+  });
+});
+
+// ----------
+// Core utils tests remain in a separate file.
@@ -0,0 +1,236 @@
+import { expect, test, mock, beforeEach, afterEach, describe, spyOn } from "bun:test";
+import * as os from "node:os";
+import * as fs from "node:fs";
+import { openMultiModel } from "../src/core/open";
+
+let originalBun$: typeof Bun.$ = (globalThis as any).Bun?.$;
+let mockCommandResponses: Record<string, { ok: boolean; stdout: string; stderr: string }> = {};
+let executedCommands: string[] = [];
+
+function setupMockBun$() {
+  const mockFn = mock((strings: TemplateStringsArray, ...values: any[]) => {
+    const parts = values[0] as string[];
+    const cmd = parts.join(" ");
+    executedCommands.push(cmd);
+    const response = mockCommandResponses[cmd] ?? { ok: true, stdout: "", stderr: "" };
+    return {
+      quiet: () => ({
+        nothrow: async () => ({
+          exitCode: response.ok ? 0 : 1,
+          stdout: { toString: () => response.stdout },
+          stderr: { toString: () => response.stderr },
+        }),
+      }),
+    };
+  });
+  (globalThis as any).Bun.$ = mockFn;
+  return mockFn;
+}
+
+function restoreOriginalBun$() {
+  (globalThis as any).Bun.$ = originalBun$;
+}
+
+describe("openMultiModel error paths", () => {
+  beforeEach(() => {
+    spyOn(os, "homedir").mockReturnValue("/mock/home");
+    mockCommandResponses = {};
+    executedCommands = [];
+    setupMockBun$();
+  });
+  afterEach(() => {
+    restoreOriginalBun$();
+  });
+
+  test("fails when model list command fails", async () => {
+    const session = "sess";
+    mockCommandResponses["git rev-parse --is-inside-work-tree"] = { ok: true, stdout: "true", stderr: "" };
+    mockCommandResponses["command -v tmux"] = { ok: true, stdout: "tmux", stderr: "" };
+    mockCommandResponses["command -v opencode"] = { ok: true, stdout: "opencode", stderr: "" };
+    mockCommandResponses["opencode models"] = { ok: false, stdout: "", stderr: "model error" };
+
+    const result = await openMultiModel({ sessionName: session, models: ["openai/gpt-5.2"], binaryName: "opencode", mode: "cli" });
+    expect(result.success).toBe(false);
+    expect(result.error).toContain("Failed to load valid models");
+  });
+
+  test("fails when duplicate models provided", async () => {
+    const session = "dup";
+    mockCommandResponses["git rev-parse --is-inside-work-tree"] = { ok: true, stdout: "true", stderr: "" };
+    mockCommandResponses["command -v tmux"] = { ok: true, stdout: "tmux", stderr: "" };
+    mockCommandResponses["command -v opencode"] = { ok: true, stdout: "opencode", stderr: "" };
+    mockCommandResponses["opencode models"] = { ok: true, stdout: "openai/gpt-5.2", stderr: "" };
+
+    const result = await openMultiModel({ sessionName: session, models: ["openai/gpt-5.2", "openai/gpt-5.2"], binaryName: "opencode", mode: "cli" });
+    expect(result.success).toBe(false);
+    expect(result.error).toContain("Duplicate model names are not allowed");
+  });
+
+  test("fails when session already exists", async () => {
+    const session = "existing";
+    mockCommandResponses["git rev-parse --is-inside-work-tree"] = { ok: true, stdout: "true", stderr: "" };
+    mockCommandResponses["command -v tmux"] = { ok: true, stdout: "tmux", stderr: "" };
+    mockCommandResponses["command -v opencode"] = { ok: true, stdout: "opencode", stderr: "" };
+    mockCommandResponses["opencode models"] = { ok: true, stdout: "openai/gpt-5.2", stderr: "" };
+    mockCommandResponses[`tmux has-session -t ${session}`] = { ok: true, stdout: "", stderr: "" };
+
+    const result = await openMultiModel({ sessionName: session, models: ["openai/gpt-5.2"], binaryName: "opencode", mode: "cli" });
+    expect(result.success).toBe(false);
+    expect(result.error).toContain("Session already exists");
+  });
+
+    test("second model fails because branch already exists", async () => {
+      const session = "sess-add";
+      const binary = "opencode";
+      const models = ["openai/gpt-5.2", "anthropic/gpt-5-2"];
+      // common mocks
+      mockCommandResponses["git rev-parse --is-inside-work-tree"] = { ok: true, stdout: "true", stderr: "" };
+      mockCommandResponses["command -v tmux"] = { ok: true, stdout: "tmux", stderr: "" };
+      mockCommandResponses["command -v opencode"] = { ok: true, stdout: "opencode", stderr: "" };
+      mockCommandResponses["opencode models"] = { ok: true, stdout: models.join("\n"), stderr: "" };
+      mockCommandResponses[`tmux has-session -t ${session}`] = { ok: false, stdout: "", stderr: "" };
+      // first model success
+      const firstBranch = `opencode/${session}/gpt-5-2`;
+      const firstPath = `/mock/home/.local/share/opencode/multi-model/${session}/gpt-5-2`;
+      mockCommandResponses[`git show-ref --verify --quiet refs/heads/${firstBranch}`] = { ok: false, stdout: "", stderr: "" };
+      mockCommandResponses[`git worktree add -b ${firstBranch} ${firstPath}`] = { ok: true, stdout: "", stderr: "" };
+      mockCommandResponses[`tmux new-session -d -s ${session} -n gpt-5-2 -c ${firstPath}`] = { ok: true, stdout: "", stderr: "" };
+      mockCommandResponses[`tmux send-keys -t ${session}:gpt-5-2 ${binary} --model 'openai/gpt-5.2' C-m`] = { ok: true, stdout: "", stderr: "" };
+      // second model branch exists
+      const secondBranch = `opencode/${session}/gpt-5-2-2`;
+      mockCommandResponses[`git show-ref --verify --quiet refs/heads/${secondBranch}`] = { ok: true, stdout: "", stderr: "" };
+      const result = await openMultiModel({ sessionName: session, models, binaryName: binary, mode: "cli" });
+      expect(result.success).toBe(true);
+      expect(result.instructions).toContain("Failed: anthropic/gpt-5-2 (Branch");
+      expect(result.windows).toContain("gpt-5-2");
+      expect(result.windows).toContain("gpt-5-2-2");
+    });
+
+    test("second model worktree creation fails", async () => {
+      const session = "sess-wt";
+      const binary = "opencode";
+      const models = ["openai/gpt-5.2", "anthropic/gpt-5-2"];
+      mockCommandResponses["git rev-parse --is-inside-work-tree"] = { ok: true, stdout: "true", stderr: "" };
+      mockCommandResponses["command -v tmux"] = { ok: true, stdout: "tmux", stderr: "" };
+      mockCommandResponses["command -v opencode"] = { ok: true, stdout: "opencode", stderr: "" };
+      mockCommandResponses["opencode models"] = { ok: true, stdout: models.join("\n"), stderr: "" };
+      mockCommandResponses[`tmux has-session -t ${session}`] = { ok: false, stdout: "", stderr: "" };
+      // first model success
+      const firstBranch = `opencode/${session}/gpt-5-2`;
+      const firstPath = `/mock/home/.local/share/opencode/multi-model/${session}/gpt-5-2`;
+      mockCommandResponses[`git show-ref --verify --quiet refs/heads/${firstBranch}`] = { ok: false, stdout: "", stderr: "" };
+      mockCommandResponses[`git worktree add -b ${firstBranch} ${firstPath}`] = { ok: true, stdout: "", stderr: "" };
+      mockCommandResponses[`tmux new-session -d -s ${session} -n gpt-5-2 -c ${firstPath}`] = { ok: true, stdout: "", stderr: "" };
+      mockCommandResponses[`tmux send-keys -t ${session}:gpt-5-2 ${binary} --model 'openai/gpt-5.2' C-m`] = { ok: true, stdout: "", stderr: "" };
+      // second model fails worktree
+      const secondBranch = `opencode/${session}/gpt-5-2-2`;
+      const secondPath = `/mock/home/.local/share/opencode/multi-model/${session}/gpt-5-2-2`;
+      mockCommandResponses[`git show-ref --verify --quiet refs/heads/${secondBranch}`] = { ok: false, stdout: "", stderr: "" };
+      mockCommandResponses[`git worktree add -b ${secondBranch} ${secondPath}`] = { ok: false, stdout: "", stderr: "wt error" };
+      mockCommandResponses[`git worktree remove -f ${secondPath}`] = { ok: true, stdout: "", stderr: "" };
+      mockCommandResponses[`git branch -D ${secondBranch}`] = { ok: true, stdout: "", stderr: "" };
+const result = await openMultiModel({ sessionName: session, models, binaryName: binary, mode: "cli" });
+
+
+        expect(result.success).toBe(true);
+        expect(result.instructions).toContain("Error: Created tmux session"); expect(result.instructions).toContain("Failed: anthropic/gpt-5-2");
+        expect(result.windows).toContain("gpt-5-2");
+        expect(result.windows).toContain("gpt-5-2-2");
+    });
+
+    test("second model window creation fails", async () => {
+      const session = "sess-win";
+      const binary = "opencode";
+      const models = ["openai/gpt-5.2", "anthropic/gpt-5-2"];
+      mockCommandResponses["git rev-parse --is-inside-work-tree"] = { ok: true, stdout: "true", stderr: "" };
+      mockCommandResponses["command -v tmux"] = { ok: true, stdout: "tmux", stderr: "" };
+      mockCommandResponses["command -v opencode"] = { ok: true, stdout: "opencode", stderr: "" };
+      mockCommandResponses["opencode models"] = { ok: true, stdout: models.join("\n"), stderr: "" };
+      mockCommandResponses[`tmux has-session -t ${session}`] = { ok: false, stdout: "", stderr: "" };
+      // first model success
+      const firstBranch = `opencode/${session}/gpt-5-2`;
+      const firstPath = `/mock/home/.local/share/opencode/multi-model/${session}/gpt-5-2`;
+      mockCommandResponses[`git show-ref --verify --quiet refs/heads/${firstBranch}`] = { ok: false, stdout: "", stderr: "" };
+      mockCommandResponses[`git worktree add -b ${firstBranch} ${firstPath}`] = { ok: true, stdout: "", stderr: "" };
+      mockCommandResponses[`tmux new-session -d -s ${session} -n gpt-5-2 -c ${firstPath}`] = { ok: true, stdout: "", stderr: "" };
+      mockCommandResponses[`tmux send-keys -t ${session}:gpt-5-2 ${binary} --model 'openai/gpt-5.2' C-m`] = { ok: true, stdout: "", stderr: "" };
+      // second model window failure
+      const secondBranch = `opencode/${session}/gpt-5-2-2`;
+      const secondPath = `/mock/home/.local/share/opencode/multi-model/${session}/gpt-5-2-2`;
+      mockCommandResponses[`git show-ref --verify --quiet refs/heads/${secondBranch}`] = { ok: false, stdout: "", stderr: "" };
+      mockCommandResponses[`git worktree add -b ${secondBranch} ${secondPath}`] = { ok: true, stdout: "", stderr: "" };
+      mockCommandResponses[`tmux new-window -d -t ${session} -n gpt-5-2-2 -c ${secondPath}`] = { ok: false, stdout: "", stderr: "win err" };
+      mockCommandResponses[`git worktree remove -f ${secondPath}`] = { ok: true, stdout: "", stderr: "" };
+      mockCommandResponses[`git branch -D ${secondBranch}`] = { ok: true, stdout: "", stderr: "" };
+const result = await openMultiModel({ sessionName: session, models, binaryName: binary, mode: "cli" });
+
+
+        expect(result.success).toBe(true);
+        expect(result.instructions).toContain("Error: Created tmux session"); expect(result.instructions).toContain("Failed: anthropic/gpt-5-2");
+        expect(result.windows).toContain("gpt-5-2");
+        expect(result.windows).toContain("gpt-5-2-2");
+    });
+
+    test("second model launch command fails", async () => {
+      const session = "sess-launch";
+      const binary = "opencode";
+      const models = ["openai/gpt-5.2", "anthropic/gpt-5-2"];
+      mockCommandResponses["git rev-parse --is-inside-work-tree"] = { ok: true, stdout: "true", stderr: "" };
+      mockCommandResponses["command -v tmux"] = { ok: true, stdout: "tmux", stderr: "" };
+      mockCommandResponses["command -v opencode"] = { ok: true, stdout: "opencode", stderr: "" };
+      mockCommandResponses["opencode models"] = { ok: true, stdout: models.join("\n"), stderr: "" };
+      mockCommandResponses[`tmux has-session -t ${session}`] = { ok: false, stdout: "", stderr: "" };
+      // first model success
+      const firstBranch = `opencode/${session}/gpt-5-2`;
+      const firstPath = `/mock/home/.local/share/opencode/multi-model/${session}/gpt-5-2`;
+      mockCommandResponses[`git show-ref --verify --quiet refs/heads/${firstBranch}`] = { ok: false, stdout: "", stderr: "" };
+      mockCommandResponses[`git worktree add -b ${firstBranch} ${firstPath}`] = { ok: true, stdout: "", stderr: "" };
+      mockCommandResponses[`tmux new-session -d -s ${session} -n gpt-5-2 -c ${firstPath}`] = { ok: true, stdout: "", stderr: "" };
+      mockCommandResponses[`tmux send-keys -t ${session}:gpt-5-2 ${binary} --model 'openai/gpt-5.2' C-m`] = { ok: true, stdout: "", stderr: "" };
+      // second model launch fails
+      const secondBranch = `opencode/${session}/gpt-5-2-2`;
+      const secondPath = `/mock/home/.local/share/opencode/multi-model/${session}/gpt-5-2-2`;
+      mockCommandResponses[`git show-ref --verify --quiet refs/heads/${secondBranch}`] = { ok: false, stdout: "", stderr: "" };
+      mockCommandResponses[`git worktree add -b ${secondBranch} ${secondPath}`] = { ok: true, stdout: "", stderr: "" };
+      mockCommandResponses[`tmux new-window -d -t ${session} -n gpt-5-2-2 -c ${secondPath}`] = { ok: true, stdout: "", stderr: "" };
+      mockCommandResponses[`tmux send-keys -t ${session}:gpt-5-2-2 ${binary} --model 'anthropic/gpt-5-2' C-m`] = { ok: false, stdout: "", stderr: "launch err" };
+      mockCommandResponses[`git worktree remove -f ${secondPath}`] = { ok: true, stdout: "", stderr: "" };
+      mockCommandResponses[`git branch -D ${secondBranch}`] = { ok: true, stdout: "", stderr: "" };
+      const result = await openMultiModel({ sessionName: session, models, binaryName: binary, mode: "cli" });
+      expect(result.success).toBe(true);
+      expect(result.instructions).toContain("Failed: anthropic/gpt-5-2 (launch err");
+      expect(result.windows).toContain("gpt-5-2");
+      expect(result.windows).toContain("gpt-5-2-2");
+    });
+
+    test("second model worktree path already exists", async () => {
+      const session = "sess-wtpath";
+      const binary = "opencode";
+      const models = ["openai/gpt-5.2", "anthropic/gpt-5-2"];
+      mockCommandResponses["git rev-parse --is-inside-work-tree"] = { ok: true, stdout: "true", stderr: "" };
+      mockCommandResponses["command -v tmux"] = { ok: true, stdout: "tmux", stderr: "" };
+      mockCommandResponses["command -v opencode"] = { ok: true, stdout: "opencode", stderr: "" };
+      mockCommandResponses["opencode models"] = { ok: true, stdout: models.join("\n"), stderr: "" };
+      mockCommandResponses[`tmux has-session -t ${session}`] = { ok: false, stdout: "", stderr: "" };
+      // first model success
+      const firstBranch = `opencode/${session}/gpt-5-2`;
+      const firstPath = `/mock/home/.local/share/opencode/multi-model/${session}/gpt-5-2`;
+      mockCommandResponses[`git show-ref --verify --quiet refs/heads/${firstBranch}`] = { ok: false, stdout: "", stderr: "" };
+      mockCommandResponses[`git worktree add -b ${firstBranch} ${firstPath}`] = { ok: true, stdout: "", stderr: "" };
+      mockCommandResponses[`tmux new-session -d -s ${session} -n gpt-5-2 -c ${firstPath}`] = { ok: true, stdout: "", stderr: "" };
+      mockCommandResponses[`tmux send-keys -t ${session}:gpt-5-2 ${binary} --model 'openai/gpt-5.2' C-m`] = { ok: true, stdout: "", stderr: "" };
+      // second model path exists
+      const secondBranch = `opencode/${session}/gpt-5-2-2`;
+      const secondPath = `/mock/home/.local/share/opencode/multi-model/${session}/gpt-5-2-2`;
+      mockCommandResponses[`git show-ref --verify --quiet refs/heads/${secondBranch}`] = { ok: false, stdout: "", stderr: "" };
+      // mock fs existsSync to return true for secondPath
+      spyOn(fs, "existsSync").mockImplementation((p) => p === secondPath);
+      const result = await openMultiModel({ sessionName: session, models, binaryName: binary, mode: "cli" });
+      expect(result.success).toBe(true);
+      expect(result.instructions).toContain("Error: Created tmux session");
+      expect(result.instructions).toContain("Failed: anthropic/gpt-5-2 (Worktree path already exists at");
+      expect(result.windows).toContain("gpt-5-2");
+      expect(result.windows).toContain("gpt-5-2-2");
+    });
+
+    });
@@ -1,7 +1,6 @@
 import { expect, test, mock, spyOn, beforeEach, afterEach, describe } from "bun:test";
 import * as fs from "node:fs";
 import * as os from "node:os";
-import { launchMultiModel } from "../src/core/launch";
 import {
  shellQuote,
  normalizeModels,
@@ -29,9 +28,7 @@ function setupMockBun$() {
  const mockFn = mock((strings: TemplateStringsArray, ...values: any[]) => {
    const parts = values[0] as string[];
    const commandSignature = parts.join(" ");
-
    executedCommands.push(commandSignature);
-
    return {
      quiet: () => ({
        nothrow: async () => {
@@ -45,7 +42,6 @@ function setupMockBun$() {
      }),
    };
  });
-
  (globalThis as any).Bun.$ = mockFn;
  return mockFn;
 }
@@ -54,305 +50,6 @@ function restoreOriginalBun$() {
  (globalThis as any).Bun.$ = originalBun$;
 }

-describe("multi-model launch", () => {
-  let existsSyncMock: ReturnType<typeof spyOn>;
-  let bunMock: ReturnType<typeof setupMockBun$>;
-
-  beforeEach(() => {
-    spyOn(os, "homedir").mockReturnValue("/mock/home");
-    existsSyncMock = spyOn(fs, "existsSync").mockReturnValue(false);
-    bunMock = setupMockBun$();
-    executedCommands = [];
-
-    mockCommandResponses = {
-      "git rev-parse --is-inside-work-tree": { ok: true, stdout: "true", stderr: "" },
-      "command -v tmux": { ok: true, stdout: "/usr/bin/tmux", stderr: "" },
-      "command -v opencode": { ok: true, stdout: "/usr/bin/opencode", stderr: "" },
-      "opencode models": { ok: true, stdout: "openai/gpt-5.2\nanthropic/claude-3-5-sonnet", stderr: "" },
-      "tmux has-session -t test-session": { ok: false, stdout: "", stderr: "session not found" },
-      "git show-ref --verify --quiet refs/heads/opencode/test-session/gpt-5-2": { ok: false, stdout: "", stderr: "" },
-    };
-  });
-
-  afterEach(() => {
-    restoreOriginalBun$();
-  });
-
-  test("fails if session name is empty", async () => {
-    const result = await launchMultiModel({
-      sessionName: "",
-      models: ["openai/gpt-5.2"],
-    });
-
-    expect(result.success).toBe(false);
-    expect(result.error).toContain("Error: `sessionName` must not be empty.");
-    expect(executedCommands).toEqual([]);
-  });
-
-  test("fails if no models are provided", async () => {
-    const result = await launchMultiModel({
-      sessionName: "test-session",
-      models: [],
-    });
-
-    expect(result.success).toBe(false);
-    expect(result.error).toContain("Error: Model names must not be empty.");
-    expect(executedCommands).toEqual([]);
-  });
-
-  test("fails if duplicate models are provided", async () => {
-    const result = await launchMultiModel({
-      sessionName: "test-session",
-      models: ["openai/gpt-5.2", "openai/gpt-5.2"],
-    });
-
-    expect(result.success).toBe(false);
-    expect(result.error).toContain("Duplicate model names are not allowed");
-    expect(executedCommands).toEqual([]);
-  });
-
-  test("fails if not inside a git repository", async () => {
-    mockCommandResponses["git rev-parse --is-inside-work-tree"] = { ok: false, stdout: "", stderr: "not a git repo" };
-
-    const result = await launchMultiModel({
-      sessionName: "test-session",
-      models: ["openai/gpt-5.2"],
-    });
-
-    expect(result.success).toBe(false);
-    expect(result.error).toContain("Error: `multi-model` requires a git repository.");
-    expect(executedCommands).toEqual(["git rev-parse --is-inside-work-tree"]);
-  });
-
-  test("fails if tmux is not installed", async () => {
-    mockCommandResponses["command -v tmux"] = { ok: false, stdout: "", stderr: "" };
-
-    const result = await launchMultiModel({
-      sessionName: "test-session",
-      models: ["openai/gpt-5.2"],
-    });
-
-    expect(result.success).toBe(false);
-    expect(result.error).toContain("Error: `tmux` is not installed or not on `PATH`.");
-    expect(executedCommands).toEqual([
-      "git rev-parse --is-inside-work-tree",
-      "command -v tmux"
-    ]);
-  });
-
-  test("fails if opencode is not installed", async () => {
-    mockCommandResponses["command -v opencode"] = { ok: false, stdout: "", stderr: "" };
-
-    const result = await launchMultiModel({
-      sessionName: "test-session",
-      models: ["openai/gpt-5.2"],
-    });
-
-    expect(result.success).toBe(false);
-    expect(result.error).toContain("Error: `opencode` is not installed or not on `PATH`.");
-    expect(executedCommands).toEqual([
-      "git rev-parse --is-inside-work-tree",
-      "command -v tmux",
-      "command -v opencode"
-    ]);
-  });
-
-  test("fails if model name is not in allowlist", async () => {
-    const result = await launchMultiModel({
-      sessionName: "test-session",
-      models: ["invalid/model"],
-    });
-
-    expect(result.success).toBe(false);
-    expect(result.error).toContain("Error: Model name 'invalid/model' not found");
-    expect(executedCommands).toEqual([
-      "git rev-parse --is-inside-work-tree",
-      "command -v tmux",
-      "command -v opencode",
-      "opencode models"
-    ]);
-  });
-
-  test("fails if session already exists", async () => {
-    mockCommandResponses["tmux has-session -t test-session"] = { ok: true, stdout: "", stderr: "" };
-
-    const result = await launchMultiModel({
-      sessionName: "test-session",
-      models: ["openai/gpt-5.2"],
-    });
-
-    expect(result.success).toBe(false);
-    expect(result.error).toContain("Error: Session already exists");
-    expect(executedCommands).toEqual([
-      "git rev-parse --is-inside-work-tree",
-      "command -v tmux",
-      "command -v opencode",
-      "opencode models",
-      "tmux has-session -t test-session"
-    ]);
-  });
-
-  test("successfully plans and executes tmux launch with single model", async () => {
-    const result = await launchMultiModel({
-      sessionName: "test-session",
-      models: ["openai/gpt-5.2"],
-    });
-
-    expect(result.success).toBe(true);
-    expect(result.instructions).toContain("Use `tmux attach -t test-session` to join session");
-    expect(executedCommands.some(c => c.startsWith("tmux new-session -d -s test-session -n gpt-5-2"))).toBe(true);
-    expect(executedCommands.some(c => c.startsWith("tmux send-keys -t test-session:gpt-5-2"))).toBe(true);
-  });
-
-  test("successfully launches multiple models", async () => {
-    mockCommandResponses["git show-ref --verify --quiet refs/heads/opencode/test-session/claude-3-5-sonnet"] = { ok: false, stdout: "", stderr: "" };
-
-    const result = await launchMultiModel({
-      sessionName: "test-session",
-      models: ["openai/gpt-5.2", "anthropic/claude-3-5-sonnet"],
-    });
-
-    expect(result.success).toBe(true);
-    expect(result.instructions).toContain("Use `tmux attach -t test-session` to join session");
-    expect(executedCommands.some(c => c.startsWith("tmux new-session -d -s test-session -n gpt-5-2"))).toBe(true);
-    expect(executedCommands.some(c => c.startsWith("tmux new-window -d -t test-session -n claude-3-5-sonnet"))).toBe(true);
-  });
-
-  test("sanitizes session name", async () => {
-    mockCommandResponses["tmux has-session -t test session!"] = { ok: false, stdout: "", stderr: "" };
-    mockCommandResponses["git show-ref --verify --quiet refs/heads/opencode/test-session/gpt-5-2"] = { ok: false, stdout: "", stderr: "" };
-
-    const result = await launchMultiModel({
-      sessionName: "test session!",
-      models: ["openai/gpt-5.2"],
-    });
-
-    expect(result.success).toBe(true);
-    expect(result.instructions).toContain("Use `tmux attach -t test session!` to join session");
-    expect(executedCommands.some(c => c.startsWith("git worktree add -b opencode/test-session/gpt-5-2"))).toBe(true);
-  });
-
-  test("fails if tmux new-session fails for the first model and triggers undo", async () => {
-    mockCommandResponses["tmux new-session -d -s test-session -n gpt-5-2 -c /mock/home/.local/share/opencode/multi-model/test-session/gpt-5-2"] = { ok: false, stdout: "", stderr: "tmux error" };
-    mockCommandResponses["git worktree remove -f /mock/home/.local/share/opencode/multi-model/test-session/gpt-5-2"] = { ok: true, stdout: "", stderr: "" };
-    mockCommandResponses["git branch -D opencode/test-session/gpt-5-2"] = { ok: true, stdout: "", stderr: "" };
-
-    const result = await launchMultiModel({
-      sessionName: "test-session",
-      models: ["openai/gpt-5.2"],
-    });
-
-    expect(result.success).toBe(false);
-    expect(result.error).toContain("Failed to create tmux session");
-    expect(executedCommands).toEqual([
-      "git rev-parse --is-inside-work-tree",
-      "command -v tmux",
-      "command -v opencode",
-      "opencode models",
-      "tmux has-session -t test-session",
-      "git show-ref --verify --quiet refs/heads/opencode/test-session/gpt-5-2",
-      "git worktree add -b opencode/test-session/gpt-5-2 /mock/home/.local/share/opencode/multi-model/test-session/gpt-5-2",
-      "tmux new-session -d -s test-session -n gpt-5-2 -c /mock/home/.local/share/opencode/multi-model/test-session/gpt-5-2",
-      "git worktree remove -f /mock/home/.local/share/opencode/multi-model/test-session/gpt-5-2",
-      "git branch -D opencode/test-session/gpt-5-2"
-    ]);
-  });
-
-  test("fails if worktree path exists for first model", async () => {
-    existsSyncMock.mockImplementation((path: string) => {
-      return path.includes("test-session/gpt-5-2");
-    });
-
-    const result = await launchMultiModel({
-      sessionName: "test-session",
-      models: ["openai/gpt-5.2"],
-    });
-
-    expect(result.success).toBe(false);
-    expect(result.error).toContain("Worktree path already exists");
-    expect(executedCommands).toEqual([
-      "git rev-parse --is-inside-work-tree",
-      "command -v tmux",
-      "command -v opencode",
-      "opencode models",
-      "tmux has-session -t test-session"
-    ]);
-  });
-
-  test("fails if git branch exists for first model", async () => {
-    mockCommandResponses["git show-ref --verify --quiet refs/heads/opencode/test-session/gpt-5-2"] = { ok: true, stdout: "", stderr: "" };
-
-    const result = await launchMultiModel({
-      sessionName: "test-session",
-      models: ["openai/gpt-5.2"],
-    });
-
-    expect(result.success).toBe(false);
-    expect(result.error).toContain("Branch 'opencode/test-session/gpt-5-2' already exists");
-    expect(executedCommands).toEqual([
-      "git rev-parse --is-inside-work-tree",
-      "command -v tmux",
-      "command -v opencode",
-      "opencode models",
-      "tmux has-session -t test-session",
-      "git show-ref --verify --quiet refs/heads/opencode/test-session/gpt-5-2"
-    ]);
-  });
-
-  test("fails if git worktree add fails for first model", async () => {
-    mockCommandResponses["git worktree add -b opencode/test-session/gpt-5-2 /mock/home/.local/share/opencode/multi-model/test-session/gpt-5-2"] = { ok: false, stdout: "", stderr: "git error" };
-
-    const result = await launchMultiModel({
-      sessionName: "test-session",
-      models: ["openai/gpt-5.2"],
-    });
-
-    expect(result.success).toBe(false);
-    expect(result.error).toContain("Failed to create worktree");
-    expect(executedCommands).toEqual([
-      "git rev-parse --is-inside-work-tree",
-      "command -v tmux",
-      "command -v opencode",
-      "opencode models",
-      "tmux has-session -t test-session",
-      "git show-ref --verify --quiet refs/heads/opencode/test-session/gpt-5-2",
-      "git worktree add -b opencode/test-session/gpt-5-2 /mock/home/.local/share/opencode/multi-model/test-session/gpt-5-2"
-    ]);
-  });
-
-  test("model name collision creates unique window names", async () => {
-    mockCommandResponses["opencode models"] = { ok: true, stdout: "openai/gpt-5.2\nanthropic/gpt-5.2", stderr: "" };
-    mockCommandResponses["git show-ref --verify --quiet refs/heads/opencode/test-session/gpt-5-2"] = { ok: false, stdout: "", stderr: "" };
-    mockCommandResponses["git show-ref --verify --quiet refs/heads/opencode/test-session/gpt-5-2-2"] = { ok: false, stdout: "", stderr: "" };
-
-    const result = await launchMultiModel({
-      sessionName: "test-session",
-      models: ["openai/gpt-5.2", "anthropic/gpt-5.2"],
-    });
-
-    expect(result.success).toBe(true);
-    expect(result.instructions).toContain("Use `tmux attach -t test-session` to join session");
-    expect(executedCommands.some(c => c.startsWith("tmux new-session -d -s test-session -n gpt-5-2"))).toBe(true);
-    expect(executedCommands.some(c => c.startsWith("tmux new-window -d -t test-session -n gpt-5-2-2"))).toBe(true);
-  });
-
-  test("long model name is truncated in window name", async () => {
-    const longModel = "verylongmodelfrontexampleprovider";
-    mockCommandResponses["opencode models"] = { ok: true, stdout: longModel, stderr: "" };
-    mockCommandResponses[`git show-ref --verify --quiet refs/heads/opencode/test-session/${longModel.slice(0, 24)}`] = { ok: false, stdout: "", stderr: "" };
-
-    const result = await launchMultiModel({
-      sessionName: "test-session",
-      models: [longModel],
-    });
-
-    expect(result.success).toBe(true);
-    expect(result.instructions).toContain("Use `tmux attach -t test-session` to join session");
-    const windowName = executedCommands.find(c => c.includes("tmux new-session"))?.match(/-n (\S+)/)?.[1];
-    expect(windowName?.length).toBeLessThanOrEqual(24);
-  });
-});
-
 describe("core utils", () => {
  let bunMock: ReturnType<typeof setupMockBun$>;

@@ -371,19 +68,15 @@ describe("core utils", () => {
    test("normal string without special characters", () => {
      expect(shellQuote("test")).toBe("'test'");
    });
-
    test("string with spaces", () => {
      expect(shellQuote("test value")).toBe("'test value'");
    });
-
    test("string with single quotes", () => {
      expect(shellQuote("test'value")).toBe("'test'\"'\"'value'");
    });
-
    test("string with multiple single quotes", () => {
      expect(shellQuote("te's't'v'alue")).toBe("'te'\"'\"'s'\"'\"'t'\"'\"'v'\"'\"'alue'");
    });
-
    test("empty string", () => {
      expect(shellQuote("")).toBe("''");
    });
@@ -393,15 +86,12 @@ describe("core utils", () => {
    test("empty array", () => {
      expect(normalizeModels([])).toEqual([]);
    });
-
    test("undefined input", () => {
      expect(normalizeModels(undefined)).toEqual([]);
    });
-
    test("array with whitespace-only strings", () => {
      expect(normalizeModels(["   ", "  "])).toEqual([]);
    });
-
    test("array with mixed valid models, padded models, and empty strings", () => {
      expect(normalizeModels([" openai/gpt-5.2 ", "", " anthropic/claude "])).toEqual(["openai/gpt-5.2", "anthropic/claude"]);
    });
@@ -411,19 +101,15 @@ describe("core utils", () => {
    test("array with no duplicates", () => {
      expect(findDuplicates(["a", "b", "c"])).toEqual([]);
    });
-
    test("array with one duplicate pair", () => {
      expect(findDuplicates(["a", "b", "a"])).toEqual(["a"]);
    });
-
    test("array with multiple different duplicates", () => {
      expect(findDuplicates(["a", "b", "a", "c", "b"])).toEqual(["a", "b"]);
    });
-
    test("array with a single value repeated more than twice", () => {
      expect(findDuplicates(["a", "a", "a"])).toEqual(["a"]);
    });
-
    test("verifying first-repeated-occurrence order", () => {
      expect(findDuplicates(["x", "a", "b", "a", "x", "b"])).toEqual(["a", "x", "b"]);
    });
@@ -433,20 +119,16 @@ describe("core utils", () => {
    test("normal model name without slashes", () => {
      expect(createWindowBaseName("gpt-5-2")).toBe("gpt-5-2");
    });
-
    test("model with slashes", () => {
      expect(createWindowBaseName("vendor/namespace/model")).toBe("model");
    });
-
    test("model exceeding WINDOW_NAME_LIMIT", () => {
      const longName = "a".repeat(30);
      expect(createWindowBaseName(longName)).toBe("aaaaaaaaaaaaaaaaaaaaaaaa");
    });
-
    test("model with special characters", () => {
      expect(createWindowBaseName("OpenAI/GPT_4.0!")).toBe("gpt-4-0");
    });
-
    test("model made entirely of special characters", () => {
      expect(createWindowBaseName("!@#$%^&*()")).toBe("model");
    });
@@ -456,21 +138,18 @@ describe("core utils", () => {
    test("single model", () => {
      expect(createWindowPlans(["openai/gpt-5-2"])).toEqual([{ model: "openai/gpt-5-2", windowName: "gpt-5-2" }]);
    });
-
    test("two models with the same base name", () => {
      expect(createWindowPlans(["openai/gpt-5-2", "anthropic/gpt-5-2"])).toEqual([
        { model: "openai/gpt-5-2", windowName: "gpt-5-2" },
-        { model: "anthropic/gpt-5-2", windowName: "gpt-5-2-2" }
+        { model: "anthropic/gpt-5-2", windowName: "gpt-5-2-2" },
      ]);
    });
-
    test("multiple collisions", () => {
      const result = createWindowPlans(["a", "b", "c", "a", "b", "a"]);
      expect(result[0]?.windowName).toBe("a");
      expect(result[3]?.windowName).toBe("a-2");
      expect(result[5]?.windowName).toBe("a-3");
    });
-
    test("truncation to accommodate suffix", () => {
      const longBase = "a".repeat(23);
      const result = createWindowPlans([longBase, "b"]);
@@ -482,27 +161,21 @@ describe("core utils", () => {
    test("identical strings", () => {
      expect(levenshtein("test", "test")).toBe(0);
    });
-
    test("one substitution", () => {
      expect(levenshtein("test", "tent")).toBe(1);
    });
-
    test("one insertion", () => {
      expect(levenshtein("test", "tests")).toBe(1);
    });
-
    test("one deletion", () => {
      expect(levenshtein("tests", "test")).toBe(1);
    });
-
    test("completely different strings", () => {
      expect(levenshtein("abc", "xyz")).toBe(3);
    });
-
    test("one empty string", () => {
      expect(levenshtein("", "test")).toBe(4);
    });
-
    test("both empty strings", () => {
      expect(levenshtein("", "")).toBe(0);
    });
@@ -513,21 +186,17 @@ describe("core utils", () => {
      const result = suggestModels("gpt-5.2", ["gpt-5.2", "gpt-5.2-mini"]);
      expect(result[0]).toBe("gpt-5.2");
    });
-
    test("fuzzy match/typo", () => {
      expect(suggestModels("gpt5.4", ["gpt-5.4"])).toEqual(["gpt-5.4"]);
    });
-
    test("fuzzy match with contains boost", () => {
      const suggestions = suggestModels("gpt4o", ["gpt-5.2", "gpt-5.2-mini"]);
      expect(suggestions[0]).toBe("gpt-5.2");
    });
-
    test("maximum of 3 suggestions", () => {
      const allowlist = ["gpt-5.2", "gpt-5.2-mini", "gpt-5.2-pro", "gpt-5.2-ultra"];
      expect(suggestModels("gpt4o", allowlist).length).toBe(3);
    });
-
    test("sorting logic", () => {
      const suggestions = suggestModels("abc", ["abc", "abd", "abe"]);
      expect(suggestions).toEqual(["abc", "abd", "abe"]);
@@ -540,13 +209,11 @@ describe("core utils", () => {
      expect(error).toContain("Model name 'gpt5.4' not found");
      expect(error).toContain("Did you mean");
    });
-
    test("single invalid model without close matches", () => {
      const error = formatInvalidModelError(["xyz"], ["abc", "def"]);
      expect(error).toContain("Model name 'xyz' not found");
      expect(error).toContain("Did you mean");
    });
-
    test("multiple invalid models", () => {
      const error = formatInvalidModelError(["xyz", "abc"], ["def"]);
      expect(error).toContain("Model names not found");
@@ -559,15 +226,12 @@ describe("core utils", () => {
    test("normal alphanumeric name", () => {
      expect(sanitizeName("test-session")).toBe("test-session");
    });
-
    test("name with spaces and special chars", () => {
      expect(sanitizeName("test session!")).toBe("test-session");
    });
-
    test("name with consecutive hyphens", () => {
      expect(sanitizeName("test--session")).toBe("test-session");
    });
-
    test("name with leading/trailing hyphens", () => {
      expect(sanitizeName("-test-session-")).toBe("test-session");
    });
@@ -581,7 +245,6 @@ describe("core utils", () => {
      expect(result.stdout).toBe("hello");
      expect(result.stderr).toBe("");
    });
-
    test("returns ok false for failed command", async () => {
      mockCommandResponses["false"] = { ok: false, stdout: "", stderr: "error" };
      const result = await runCommand(["false"]);
@@ -596,7 +259,6 @@ describe("core utils", () => {
      const result = getWorktreePath("my-session", "gpt-5.2");
      expect(result).toBe("/home/user/.local/share/opencode/multi-model/my-session/gpt-5.2");
    });
-
    test("handles nested session names", () => {
      spyOn(os, "homedir").mockReturnValue("/home/user");
      const result = getWorktreePath("parent/child", "window");
@@ -620,7 +282,6 @@ describe("core utils", () => {
      const errors = await undoWorktree("/path/to/worktree", "opencode/session/window");
      expect(errors).toEqual([]);
    });
-
    test("returns error when worktree remove fails", async () => {
      mockCommandResponses["git worktree remove -f /path/to/worktree"] = { ok: false, stdout: "", stderr: "remove failed" };
      mockCommandResponses["git branch -D opencode/session/window"] = { ok: true, stdout: "", stderr: "" };
@@ -629,7 +290,6 @@ describe("core utils", () => {
      expect(errors.length).toBe(1);
      expect(errors[0]).toContain("Failed to remove worktree");
    });
-
    test("returns error when branch delete fails", async () => {
      mockCommandResponses["git worktree remove -f /path/to/worktree"] = { ok: true, stdout: "", stderr: "" };
      mockCommandResponses["git branch -D opencode/session/window"] = { ok: false, stdout: "", stderr: "branch delete failed" };
@@ -638,7 +298,6 @@ describe("core utils", () => {
      expect(errors.length).toBe(1);
      expect(errors[0]).toContain("Failed to delete branch");
    });
-
    test("returns both errors when both operations fail", async () => {
      mockCommandResponses["git worktree remove -f /path/to/worktree"] = { ok: false, stdout: "", stderr: "remove failed" };
      mockCommandResponses["git branch -D opencode/session/window"] = { ok: false, stdout: "", stderr: "branch delete failed" };
@@ -656,7 +315,6 @@ describe("core utils", () => {
      expect(result.ok).toBe(true);
      expect(executedCommands).toContain("tmux send-keys -t session:window opencode --model 'openai/gpt-5.2' C-m");
    });
-
    test("uses custom binary name", async () => {
      mockCommandResponses["tmux send-keys -t session:window kilo --model 'openai/gpt-5.2' C-m"] = { ok: true, stdout: "", stderr: "" };

@@ -680,7 +338,18 @@ describe("core utils", () => {
      expect(worktrees[0]?.path).toBe("/home/user/.local/share/opencode/multi-model/my-session/gpt-5.2");
      expect(worktrees[0]?.branch).toBe("opencode/my-session/gpt-5.2");
    });
+    test("sanitizes session name when filtering worktrees", async () => {
+      spyOn(os, "homedir").mockReturnValue("/home/user");
+      mockCommandResponses["git worktree list --porcelain"] = {
+        ok: true,
+        stdout: "worktree /home/user/.local/share/opencode/multi-model/my-session/gpt-5.2\nbranch refs/heads/opencode/my-session/gpt-5.2",
+        stderr: "",
+      };

+      const worktrees = await getWorktreesForSession("my session!");
+      expect(worktrees.length).toBe(1);
+      expect(worktrees[0]?.path).toBe("/home/user/.local/share/opencode/multi-model/my-session/gpt-5.2");
+    });
    test("returns empty array when no matching worktrees", async () => {
      spyOn(os, "homedir").mockReturnValue("/home/user");
      mockCommandResponses["git worktree list --porcelain"] = {
@@ -699,7 +368,6 @@ describe("core utils", () => {
      delete process.env.OPENCODE_MULTI_MODEL_BINARY;
      expect(getBinaryName()).toBe("opencode");
    });
-
    test("returns env var value when set", () => {
      process.env.OPENCODE_MULTI_MODEL_BINARY = "kilo";
      expect(getBinaryName()).toBe("kilo");
Author	SHA1	Message	Date
bendtherules	f0cc07f513	chore(release): 0.0.5	2026-03-21 01:11:36 +05:30
bendtherules	6dd4ee4b4f	fix: correct path for cli.js in package.json	2026-03-21 01:11:30 +05:30
bendtherules	dd7ac4dc2d	chore(release): 0.0.4	2026-03-21 01:10:27 +05:30
bendtherules	e8dbcff73e	fix test	2026-03-21 01:10:21 +05:30
bendtherules	787fa75df4	build: color-code open and close outputs	2026-03-21 01:05:17 +05:30
bendtherules	17bb1130c8	build: color-code open output	2026-03-21 00:22:31 +05:30
bendtherules	c642148cac	test: add user confirmation handling for cleanup in closeMultiModel	2026-03-20 14:56:29 +05:30
bendtherules	7abfd6bf64	test: fix tests	2026-03-20 14:46:00 +05:30
bendtherules	93478294aa	test: add error handling tests for closeMultiModel and openMultiModel	2026-03-20 14:20:34 +05:30
bendtherules	5d50038845	docs: update test coverage command in README	2026-03-20 14:08:00 +05:30
bendtherules	0b88ea0763	docs: add local code coverage instructions	2026-03-20 14:02:41 +05:30
bendtherules	ffdc5451ab	refactor: tests and add close.test.ts	2026-03-20 13:51:28 +05:30
bendtherules	8a087275b3	refactor: rename launchMultiModel to openMultiModel	2026-03-20 13:38:46 +05:30
bendtherules	962c9a474f	refactor: rename src/core/launch.ts to open.ts	2026-03-20 13:33:30 +05:30
bendtherules	71523f2144	feat: add launch configuration for multi-model sessions in VSCode	2026-03-20 13:29:36 +05:30
bendtherules	1c2f203a34	feat: add initial VSCode settings for Bun configuration	2026-03-20 13:22:00 +05:30
bendtherules	536e30c5d0	test: add session name sanitization when fetching worktrees	2026-03-20 13:21:51 +05:30
bendtherules	da0ed90192	fix: sanitize session name in getWorktreesForSession function	2026-03-20 13:17:10 +05:30
bendtherules	49da7c4219	chore(release): 0.0.3	2026-03-20 10:42:09 +05:30
bendtherules	41757e712f	fix: update package name to remove username prefix	2026-03-20 10:41:58 +05:30
bendtherules	96e3922c42	chore(release): 0.0.2	2026-03-20 10:39:56 +05:30
bendtherules	d6a2811ec4	fix: update release script permissions to executable	2026-03-20 10:39:48 +05:30
bendtherules	c179491aed	build: add release script	2026-03-20 10:38:07 +05:30
bendtherules	1b8f54d955	fix: revert version number to 0.0.1 in package.json	2026-03-20 10:35:36 +05:30
bendtherules	7cecbede6d	fix: update npm @username to @bendtherules	2026-03-20 10:33:39 +05:30