[BUG]

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?

Bug Description
The plugins marketplace fails to load in Claude Desktop on macOS Tahoe, showing:

Error invoking remote method '$eipc_message$_..._$_claude.web.$_CustomPlugins.$.listAvailablePlugins': Error: Result from method "listAvailablePlugins" in interface "CustomPlugins" failed to pass validation

Environment

• Claude Desktop version: [check Claude menu → About Claude]
• macOS: Tahoe 26.3.1
• Chip: Apple M4 Max
• Memory: 36 GB

Steps to Reproduce

1. Open Claude Desktop
2. Open any conversation
3. Click the plugins icon or navigate to Browse Plugins
4. Observe "Failed to load marketplaces" error with the validation failure message

Expected Behavior
The plugins marketplace should load and display available plugins under the "By Anthropic" and "Personal" tabs.

Actual Behavior
Marketplace fails every time with a listAvailablePlugins validation error. Clicking "Try again" reproduces the same error. Restarting Claude Desktop does not resolve it.

Additional Context
Based on issue #30717, this appears related to the app downloading the wrong platform binary (linux-arm64 instead of darwin-arm64) on Apple Silicon Macs running macOS Tahoe, causing a checksum verification failure that surfaces as this validation error in the UI.

Related Issues

• #30717 — Checksum mismatch / wrong platform binary on macOS Tahoe
• #27390 — MCP servers fail with Protocol instance reuse error
• #24328 — getPlugins schema validation errors in Cowork

What Should Happen?

Expected Behavior
The plugins marketplace should load and display available plugins under the "By Anthropic" and "Personal" tabs.

Error Messages/Logs

**Bug Description**
The plugins marketplace fails to load in Claude Desktop on macOS Tahoe, showing:

> Error invoking remote method '$eipc_message$_..._$_claude.web.$_CustomPlugins.$.listAvailablePlugins': Error: Result from method "listAvailablePlugins" in interface "CustomPlugins" failed to pass validation

Steps to Reproduce

Steps to Reproduce

1. Open Claude Desktop
2. Open any conversation
3. Click the plugins icon or navigate to Browse Plugins
4. Observe "Failed to load marketplaces" error with the validation failure message

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Claude 1.1.6679 (f8f4ff) 2026-03-13T18:26:03.000Z

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

<img width="1131" height="631" alt="Image" src="https://github.com/user-attachments/assets/b20be71f-3d49-48a6-bfe7-4478212eb189" />