Sequential Thinking MCP server missing from new Copilot Chat / VS Code registry

[lukaszwojcik89]

Describe the bug
I noticed the Sequential Thinking MCP server (package: @modelcontextprotocol/server-sequential-thinking) is not listed in the VS Code / MCP registry (https://github.com/mcp?utm_source=vscode-website&utm_campaign=mcp-registry-server-launch-2025). I tried to install it from the official registry page but couldn't find it, so I installed it manually. The problem is that it isn't available officially — and my manual install is flaky: sometimes the tool loads and works, sometimes it doesn't.

To Reproduce
Steps to reproduce the behavior:

1. Look for "sequentialthinking" in the VS Code MCP server list or at the official MCP registry page. You won't find it.
2. Try to add it manually to your MCP config (example used by me):

"sequentialthinking": {
  "command": "npx",
  "args": [
    "-y",
    "@modelcontextprotocol/server-sequential-thinking"
  ],
  "type": "stdio"
}

3. Reload/restart Copilot Chat or VS Code. Sometimes the server appears and the tool is usable; other times it does not show up or tool calls fail.

Expected behavior

• Ideally the Sequential Thinking server would be available from the official MCP registry so it can be installed reliably from the UI.
• If the server is intentionally not included, I expect clear notice in the docs or registry and guidance on whether it will be added, and how to run it reliably if I install it manually.

Logs
If helpful, I can attach:

• VS Code / Copilot Chat console logs when trying to add/install the server.
• NPX stdout/stderr from the manual install attempts.
• Any error messages returned when calling the tool (e.g., "Unknown tool: sequentialthinking").

Additional context / questions

• I tried installing from the official page and couldn't find it, so I resorted to manual NPX install.
• Manual install behaves inconsistently — sometimes it works, sometimes not.
• Is there a plan to list this server in the official MCP registry? If so, when?
• Has anyone else experienced the same problem with community MCP servers not appearing in the registry or being unreliable when installed manually? Any known workarounds or best practices to make manual installs stable?

Report prepared by: @lukaszwojcik89

[olaservo]

Hi @lukaszwojcik89 the official server registry should be fully released soon and I'm expecting that this will be listed there (and eventually I'm assuming that VSCode, etc, will be using a subregistry based on that). You can check out the registry repo for more information: https://github.com/modelcontextprotocol/registry

When you mention this not installing manually, that could be a few reasons related to your environment, or potentially something else. Could you share more info on any errors you get?

[lukaszwojcik89]

Thanks a lot for the clarification and for the quick response, much appreciated!

I still have the server manually added in my .mcp.json, and everything seems stable for the moment. I just checked again and I’m currently unable to reproduce the issue. The SequentialThinking server loads correctly now, so it’s possible the earlier problem was related to a recent VS Code updates.

If the issue reappears, I’ll make sure to save logs and NPX output and share them here for reference
Thanks again for the support!