Where does the bug appear (feature/product)?
Cursor IDE
Describe the Bug
The Cursor UI does not display progress updates from MCP tools, even when the fastmcp server correctly detects progress tokens ( progressToken = ctx.request_context.meta.progressToken
) and sends progress notifications via ctx.report_progress().
Progress bar is critical for long-horizon tool requests.
Steps to Reproduce
- Create a fastmcp-based MCP tool that uses ctx.report_progress(progress=X, total=100) with progress token detection
- Verify the tool detects progressToken from ctx.request_context.meta.progressToken
- Call the tool from Cursor chat
- Observe that only the final result appears, with no progress indicators or streaming updates visible in the UI
- Unsure whether the progress is recorded internally
Expected Behavior
Progress indicators should appear next to the tool name (e.g., “25 / 100”, “50 / 100”)
- Real-time progress updates should be visible during tool execution
ctx.info() messages should stream in real-time - Progress bar or percentage indicators should show completion status
as mentioned here: MCP Progress Reporting not behaving as expected - #4 by condor
Operating System
Windows 10/11
Current Cursor Version (Menu → About Cursor → Copy)
Version: 1.6.26 (system setup)
VSCode Version: 1.99.3
Commit: 6af2d906e8ca91654dd7c4224a73ef17900ad730
Date: 2025-09-16T17:12:31.697Z
Electron: 34.5.8
Chromium: 132.0.6834.210
Node.js: 20.19.1
V8: 13.2.152.41-electron.0
OS: Windows_NT x64 10.0.26100
Does this stop you from using Cursor
Sometimes - I can sometimes use Cursor
