main 07f7f976097b56450364fe136aac9253f4f7d8e1

real dev server: port 16733, web 8693
project added through UI: /home/user/t3code
Codex gpt-6.1-sol: completed real turn, git root /home/user/t3code, HEAD 89a2e13f44
Cursor added through Settings > Providers > Add provider
Observed: Not authenticated · Sign in with Cursor or add CURSOR_API_KEY in provider settings.
0 models reported. No Cursor credentials configured.
Original workspaceFolder MCP bug cannot be reached through authenticated Cursor turn on this VM.

PR head: 89a2e13f442efdb7914ee3e00a1bee097cabe50d
real dev server: port 13773, web 5733, isolated home /home/user/t3code/.t3
project: /home/user/t3code, added through web UI
real gpt-6.1-sol turn: git root /home/user/t3code, short head 89a2e13f44
follow-up after Cursor failure: git status --short returned ?? .cursor/mcp.json

Configured real @modelcontextprotocol/server-filesystem stdio server as workspace-files:
{
  "mcpServers": {
    "workspace-files": {
      "command": "node",
      "args": [
        "${workspaceFolder}/.t3/mcp-tools/node_modules/@modelcontextprotocol/server-filesystem/dist/index.js",
        "${workspaceFolder}"
      ]
    },
    "plain-files": {
      "command": "node",
      "args": [
        "/home/user/t3code/.t3/mcp-tools/node_modules/@modelcontextprotocol/server-filesystem/dist/index.js",
        "/home/user/t3code"
      ]
    }
  }
}

$ timeout 90 node apps/server/src/bin.ts thread start --base-dir /home/user/t3code/.t3 --title "Verify Cursor workspace MCP" --provider cursor --model composer-2.5 --wait /home/user/t3code "Use the workspace-files MCP tools to read the first line of README.md. Do not use shell or other tools as a substitute. Do not edit files."
Thread mcp:e2cace11-fcbb-403c-ad30-b0c275f72ee6
Thread mcp:e2cace11-fcbb-403c-ad30-b0c275f72ee6 stopped with status failed: Cursor Agent SDK open failed.

Underlying server error, observed in /tmp/dev.log:
ProviderSetupError: Sign in with Cursor or add CURSOR_API_KEY in provider settings.

Blacksmith existing checks:
vp test run packages/provider-cursor/src/server/adapter.test.ts: 19 passed
vp test run apps/server/src/orchestration-v2/testkit/CursorReplayFixtures.integration.test.ts: 11 passed

Verdict: changed authenticated Cursor MCP behavior is unverified. Neither the original MODULE_NOT_FOUND on main nor a successful Cursor MCP tool call on the PR could be reached without Cursor credentials.