Agent Plugins: 404 error when fetching marketplace.json from awesome-copilot repo

[ShigenoriAkasobe]

Does this issue occur when all extensions are disabled?: Yes

VS Code Version

1.110.0 (February 2026 release)

Description

After updating to 1.110.0, the Developer Console shows a 404 error when VS Code attempts to fetch the agent plugins marketplace from the awesome-copilot repository.

The request targets the following URL:

https://raw.githubusercontent.com/github/awesome-copilot/main/.claude-plugin/marketplace.json

Accessing this URL directly in a browser also returns 404. The file does not exist at this path in the repository.

Steps to Reproduce

1. Update VS Code to 1.110.0
2. Open Developer Tools (Help > Toggle Developer Tools)
3. Check the Console tab
4. Observe the following error:

   GET https://raw.githubusercontent.com/github/awesome-copilot/main/.claude-plugin/marketplace.json 404 (Not Found)
   

5. Confirm by accessing the URL directly in a browser — returns 404

Expected Behavior

VS Code should successfully retrieve marketplace.json from the awesome-copilot repository and display available agent plugins in the Extensions view.

Actual Behavior

The request fails with HTTP 404. As a result, agent plugins from the awesome-copilot source cannot be listed or installed.

Additional Context

This only affects the agent plugins discovery UI. GitHub Copilot core functionality is unaffected.

Relevant Log

requestImpl.ts:33  GET https://raw.githubusercontent.com/github/awesome-copilot/main/.claude-plugin/marketplace.json 404 (Not Found)
    at pluginMarketplaceService.ts:162 (_fetchFromGitHubRepo)
    at pluginMarketplaceService.ts:136 (fetchMarketplacePlugins)
    at agentPluginsView.ts:489 (queryMarketplace)

[ShigenoriAkasobe]

[ShigenoriAkasobe]

• In v1.110.0, the display appears as follows: