[Bug] Kilo Code handoff fails - wrong extensionId casing (kilocode.Kilo-Code vs kilocode.kilo-code)

[ahmet-gungor]

Description

The "Handoff To Kilo Code" feature silently fails and falls back to Claude Code CLI in the terminal. Kilo Code never receives the handoff prompt.

Root Cause (Found in Source Code)

In extension.js (v2.16.2), the Kilo Code agent handler registers with an incorrect extensionId:

Current (Bug):

extensionId: 'kilocode.Kilo-Code'   // Capital K and C

Expected (Fix):

extensionId: 'kilocode.kilo-code'   // All lowercase

VS Code extension IDs are case-sensitive. The real Kilo Code extension ID (as defined in its package.json) is kilocode.kilo-code (all lowercase).

Because of this mismatch, vscode.extensions.getExtension('kilocode.Kilo-Code') returns undefined, and Traycer falls back to the Claude Code CLI agent.

Evidence

Found at byte offset ~4795098 in the compiled extension.js:

Yz = class extends uT {
  constructor(_0x271697) {
    super(_0x271697, {
      'extensionId': 'kilocode.Kilo-Code',
      'displayName': 'Kilo Code',
      'extensionName': 'Kilo Code',
      'sidebarCommand': 'kilo-code.SidebarProvider.focus'
    });
  }
}

For comparison, the Roo Code handler has the correct casing:

extensionId: 'RooVeterinaryInc.roo-cline'  // Matches actual extension

Steps to Reproduce

1. Install Traycer (v2.16.2) and Kilo Code (v7.1.9) in VS Code
2. 2. Add "Kilo Code" in Traycer Settings > Additional Agents
3. 3. Create a task/plan in Traycer
4. 4. Click "Handoff To" > Select "Kilo Code"
5. 5. Expected: Prompt appears in Kilo Code sidebar panel
6. 6. Actual: Claude Code CLI launches in terminal instead; Kilo Code receives nothing

Environment

• VS Code: Latest
• • Traycer: v2.16.2 (win32-x64)
• • • Kilo Code: v7.1.9 (win32-x64)
• • • • OS: Windows Server

Suggested Fix

Change the extensionId from kilocode.Kilo-Code to kilocode.kilo-code in the source code where the Kilo Code agent handler is defined.

[hdkshingala]

Hello @ahmet-gungor,

Thank you for bringing this to our attention.

The extension IDs in VSCode and its forks are case-insensitive, and hand off to Kilo Code works when we tried to reproduce this issue in v2.16.2.

Could you please share your current VS Code version? Also, kindly provide the Traycer extension logs. It shouldn't automatically send the prompt to Claude Code even if the extension ID is incorrect.

[hdkshingala]

The handoff works on Kilo Code's released version v5.12.0, but fails on the pre-release version v7.1.9.

They seem to have changed the API contract that we use to trigger the handoff.

Since this is a pre-release version, they may further change the API, so we will have to wait for the released version to update the APIs.