Failed to fetch remote embeddings cache (404)

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@osortega is already working on this.

Since Jun 26, 2026.

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Description

Bug Report: Copilot - Failed to fetch remote embeddings cache (404)

Error

[Extension Host] Failed to fetch remote embeddings cache from https://embeddings.vscode-cdn.net/text-3-small/v1.126/tools/latest.txt
[Extension Host] Response status: 404, status text:
[Extension Host] Failed to fetch remote embeddings cache from https://embeddings.vscode-cdn.net/text-3-small/v1.126/tools/core.json
[Extension Host] Response status: 404, status text:
[Extension Host] Error from tool copilot_searchCodebase with parameters {"requestId":"...","query":"..."}

Steps to Reproduce

  1. Open VS Code with GitHub Copilot extension enabled
  2. Use Copilot's code search feature (copilot_searchCodebase)
  3. The error appears in the DevTools console (Help > Toggle Developer Tools)

Expected Behavior

Copilot should successfully fetch the remote embeddings cache and perform code search without errors.

Actual Behavior

The requests to embeddings.vscode-cdn.net return HTTP 404, causing the embeddings cache fetch to fail and the copilot_searchCodebase tool to error out.

Root Cause

The Copilot extension is requesting embedding resources at paths (/text-3-small/v1.126/tools/latest.txt and /tools/core.json) that no longer exist on the CDN. This is likely due to a version mismatch between the installed Copilot extension and the current CDN resource structure, or the CDN paths have been updated/removed on the server side.

Dominant language
TypeScript
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