Plan mode can't access Notion MCP

Support Bug Reports
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1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

When using Plan Mode with the Notion MCP server connected, any attempt to invoke a Notion tool (e.g. notion-fetch) fails with a validation error indicating that required arguments are undefined. Switching to Agent Mode instantly resolves the issue - the exact same tool call succeeds without any changes to the MCP configuration or prompt.

Steps to Reproduce

Connect the Notion MCP server in Cursor settings
Open a chat in Plan Mode
Ask cursor to fetch or interact with a Notion page (e.g. “fetch this Notion doc: …”)
Observe the error in the chat output
Switch to agent mode and ask to fetch again → success

Expected Behavior

Plan Mode should be able to invoke Notion MCP tools with correctly forwarded arguments, the same way Agent Mode does.

Screenshots / Screen Recordings

Screenshot 2026-04-07 at 16.52.22.png
Screenshot 2026-04-07 at 16.52.22.png870Ă—933 98.6 KB

Operating System

MacOS

Version Information

Version: 3.0.12
VSCode Version: 1.105.1
Commit: a80ff7dfcaa45d7750f6e30be457261379c29b00
Date: 2026-04-04T00:13:18.452Z
Layout: editor
Build Type: Stable
Release Track: Default
Electron: 39.8.1
Chromium: 142.0.7444.265
Node.js: 22.22.1
V8: 14.2.231.22-electron.0
OS: Darwin x64 24.6.0

For AI issues: which model did you use?

auto

Does this stop you from using Cursor

Sometimes - I can sometimes use Cursor

5

Hey, thanks for the report. I see the screenshot with the error, this is a known issue.

During MCP tool auto-calls, the model sometimes doesn’t pass required args, and the call gets sent with an empty {}. This shows up more often in Plan Mode because it has a different set of available tools. A few users have hit the same thing across different MCP servers (GitHub, Linear, and others):

The team is aware. Until it’s fixed, the workaround is to use Agent Mode for MCP tool calls.

Let me know if you have any questions.

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