MCP Server In VS code

[Abiji-2020]

Description

I have been trying to integrate the MCP server on the VS-code using the mcp.json file and i have been getting the error

Failed to validate tool mcp_insforge_run-raw-sql: Error: tool parameters array type must have items. Please open a Github issue for the MCP server or extension which provides this tool

Upon investigation I have found out that VS code have strict patterns for the tool calling, and the run-raw-sql tool has any in the parameter array which causes this issue.

@tonychang04 will this be in your scope, as adding VS code as one of the client would improve the adaptation for many users.

[tonychang04]

This is actually really interesting. I actually faced this issue sometimed... then suddenly it auto fixed itself.. I'm unable to root cause this..? what is the mcp client or coding agent you are using?

[Abiji-2020]

I am trying to use the default MCP client provided in Visual Studio code. To reproduce this add the json file in .vscode/mcp.json and then try to use agent chat with models such as claude haiku 4.5, GPT 5, claude sonnet 3.7, everything results in the same issue.

{
  "server": {
    "insforge": {
      "command": "npx",
      "args": [
        "-y",
        "@insforge/mcp@latest"
      ],
      "env": {
        "API_KEY": "your_api_key",
        "API_BASE_URL": "http://localhost:7130"
      }
    }
  }
}

[Abiji-2020]

microsoft/vscode#246119

The same issue is being discussed at vscode repo

[tonychang04]

Thanks for the research!

man..🤷. It somehow repro in my cursor before for like an hour or two. don't know what happened... I personally think people use cursor or claude code or other coding ide more. So it's a nice to have feature but not as urgent... or if microsft can fix it

[Abiji-2020]

On our part in the MCP tool we are giving the params as any inside the arrary for the tool run-raw-sql , which is producing this issue. And within the discussed issue on vscode repo, it was closed as they are enabling strict type checking on the mcp tool calls.