"MCP Tool" instead of the actual tool name

[b3nw]

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

At some frequency, when interacting with mcp tools, it prompts to approve a tool call with the name “MCP Tool” instead of the actual name. Most of the time, if you just wait long enough, it will be updated with the actual tool name, but not always. This leaves you with a choice to approve a unknown tool call with no details, not great.

Steps to Reproduce

I’m not sure how to reproduce this, but I am getting it regularly with the n8n-mcp and sonnet-4.5

Operating System

Windows 10/11

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.7.52 (user setup)
VSCode Version: 1.99.3
Commit: 9675251a06b1314d50ff34b0cbe5109b78f848c0
Date: 2025-10-17T01:41:03.967Z
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

No - Cursor works, but with this issue

[deanrie]

Hey, thanks for the report. It looks like a timing/race condition where the UI shows a generic “MCP Tool” placeholder before the actual tool name loads.

To help us investigate, please share:

• Does this happen with other MCP servers or only with n8n-mcp?
• Does it occur with models other than claude-4.5-sonnet?
• In Cursor Settings → Tools & MCP, is your n8n server green (connected)?
• When it happens, can you check View → Output → MCP: user-n8n for any errors?

I’ve noted this is related to MCP approval work the team is actively fixing.

[b3nw]

@deanrie

Does this happen with other MCP servers or only with n8n-mcp?

yes, I’ve experienced it with gitea, and a few others

@deanrie

Does it occur with models other than claude-4.5-sonnet?

yes, also see it with gpt-5, and gpt-5-codex

@deanrie

In Cursor Settings → Tools & MCP, is your n8n server green (connected)?

yes, the mcp calls function just fine

I don’t have a log, I will see if anything shows up when it reproduces.