Allow read only MCPs in plan mode

Feature request for product/service

Cursor IDE

Describe the request

Title: Enable read-only MCP tools in Plan Mode

Description:
Currently, MCP tools (Linear, PostHog, etc.) are completely disabled in plan mode. This creates a problem because creating an informed plan often requires querying external data sources:

  • Checking Linear issues to understand requirements
  • Querying PostHog analytics to inform decisions
  • Reading documentation from MCP servers

Request: Allow read-only MCP operations in plan mode. These are inherently safe operations that don’t modify state, and restricting them makes it harder to create comprehensive, data-informed plans.

Workaround: Currently have to exit plan mode, gather data in normal mode, then re-enter plan mode - which defeats the purpose of having a planning phase.

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