[BUG] Marketplaces tab fails to add marketplace — externalHttp/firstPartyApi routing error

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Adding a marketplace URL in the "Manage Plugins > Marketplaces" tab fails with the following error:

Claude CLI exited with code 1: × Failed to add marketplace: Failed to download
marketplace from https://marketplace.anthropic.com: externalHttp:
https://marketplace.anthropic.com is Anthropic-operated. Use firstPartyApi from
src/services/http/firstParty — it enforces the 3P data-residency gate.

Environment

OS: Windows 11
Claude Code version:

What Should Happen?

Expected behavior

The marketplace is added and plugins are discoverable.

Error Messages/Logs

Actual behavior

CLI exits with code 1. The app's own marketplace URL is being fetched via externalHttp instead of firstPartyApi, triggering an internal routing assertion.

Steps to Reproduce

Steps to reproduce

Open Claude Code desktop app
Go to Manage Plugins → Marketplaces tab
Enter https://marketplace.anthropic.com in the input field
Click Add

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Claude 1.9659.4 (8cc655)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_